CN108623341B - An automatic vermicompost sludge disposal system and its application method - Google Patents
An automatic vermicompost sludge disposal system and its application method Download PDFInfo
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- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K67/00—Rearing or breeding animals, not otherwise provided for; New or modified breeds of animals
- A01K67/30—Rearing or breeding invertebrates
- A01K67/33—Earthworms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/05—Treatments involving invertebrates, e.g. worms, flies or maggots
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- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/40—Treatment of liquids or slurries
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- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/70—Controlling the treatment in response to process parameters
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
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- C—CHEMISTRY; METALLURGY
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- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
- C05F17/964—Constructional parts, e.g. floors, covers or doors
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
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- C05F17/90—Apparatus therefor
- C05F17/964—Constructional parts, e.g. floors, covers or doors
- C05F17/971—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material
- C05F17/979—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material the other material being gaseous
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- C05F17/986—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material the other material being liquid
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- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
- C05F17/993—Arrangements for measuring process parameters, e.g. temperature, pressure or humidity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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Abstract
本发明公开了一种自动化蚯蚓生物堆肥污泥处置系统及其应用方法，包括：生物浸滤预理处系统、静态腐熟预处理系统、自动上料系统、模块化堆肥系统和蚯蚓/蚓茧自动分筛收集系统。生物浸滤预理处系统和静态腐熟预处理系统对养殖蚯蚓的物料做预处理，物料处理后进入自动上料系统，进行蚯蚓箱式自动加料；蚯蚓箱加料完成后用以模块化堆肥系统，投入蚯蚓种后进行养殖；蚯蚓养殖箱内的原辅料和蚯蚓进蚯蚓/蚓茧自动分筛收集系统经行分选收集，分选出三种产物即蚯蚓、蚯蚓茧和蚯蚓粪。本发明的优点在于：采用高自动化生产模式，减少人工，降低成本，提高产能；一次性彻底分离蚯蚓粪、蚯蚓卵、蚯蚓，分离效果好、效率高的纯蚯蚓粪；解决蚯蚓父代和子代彻底分离技术。
The invention discloses an automatic earthworm biological composting sludge disposal system and an application method thereof. Sieve collection system. The biological leaching pretreatment system and the static decomposing pretreatment system pretreat the materials for cultivating earthworms. After the materials are processed, they enter the automatic feeding system for automatic feeding in the earthworm box; After the earthworm seeds are put in, they are cultivated; the raw materials and earthworms in the earthworm breeding box enter the earthworm/worm cocoon automatic screening and collection system for sorting and collection. The advantages of the invention are: adopting a high-automatic production mode, reducing labor, reducing costs, and improving productivity; thoroughly separating vermicompost, worm eggs and earthworms at one time, and having good separation effect and high efficiency of pure vermicompost; Complete separation technology.
Description
Technical Field
The invention relates to the technical field of earthworm bio-compost treatment, in particular to an automatic earthworm bio-compost sludge treatment system and an application method thereof.
Background
The prior earthworm bio-composting technology has a plurality of disadvantages. The existing earthworm bio-composting technology basically has no prior treatment technology or takes simple organic auxiliary materials as additives to adjust the carbon-nitrogen ratio of sludge so that the sludge is more suitable for earthworms to live, but the treatment is too extensive, so that the earthworms are usually killed abnormally when the earthworm diseases easily occur, and the earthworm bio-composting technology is not suitable for large-scale production; at present, an earthworm composting site is mainly an open earthworm ground breeding bed or an earthworm ground breeding bed or a breeding pond in a common greenhouse, so that secondary pollution of percolate of biological composting raw materials such as sludge and the like to soil and underground water is easily caused, even if the ground breeding bed subjected to anti-seepage treatment is difficult to collect percolate and control the biological composting environment, and the centralized collection, unified harmless treatment cannot be realized; the existing biological compost in an open-air or common greenhouse can only realize ground single-layer compost, the compost field utilization rate is low, the land use area is too large, the living environment of earthworms in the earthworm biological compost can not be effectively controlled, such as temperature, humidity, pH value and pathogenic bacteria in ground soil, so that the earthworms are easy to cause seasonal large-area death; the compost field has low utilization rate, and the overlarge land use area greatly wastes land resources and greatly reduces the production benefit; the traditional earthworm bio-compost depends on manual feeding, has low efficiency, cannot control accurate feeding amount and secondary treatment of raw materials, is difficult to control production environment, and easily scatters the raw materials such as sludge and the like in a field to cause dirty and bad smell in the field; traditional earthworm bio-compost depends on open air or vegetable greenhouse ground cultivation, the living environment of earthworms, such as temperature, humidity, pH value and the like, cannot be effectively controlled, the amount of compost raw materials cannot be controlled, the growth cycle of the earthworms is unstable, the composting completion time is unstable, industrialized quantitative production cannot be realized, namely modular production cannot be achieved, the production scale cannot be rapidly controlled in the face of increase and decrease of business, particularly, when the business volume is increased, production places and facilities cannot be accurately increased according to the increased business volume, the production cost cannot be accurately calculated, the profit calculation of enterprises is wrong in the production process, and the production decision of the enterprises is misjudged; finished earthworms after biological composting need to be separated out for bait sale or later-stage deep processing, the traditional earthworm separation is that earthworms soil on materials are scraped layer by iron according to the light-shielding property of the earthworms, the earthworms climb downwards by sunlight, and pure earthworms are left after all the earthworm soil on the surfaces are scraped completely, so that the method is long in time consumption, occupies a large amount of manpower and sites, and is underground in efficiency; the production of sludge by traditional earthworm bio-compost treatment is carried out by purchasing earthworm seeds of cow dung earthworm farms, earthworm cocoons produced by earthworms directly enter a fertilizer production link in the production process, cannot be effectively utilized, causes a large amount of waste, also causes that the earthworm bio-compost cannot get rid of dependence on cow dung earthworms, and causes great limitation to production scale and stability; traditional earthworm cast drying device is mainly used traditional energy, and the energy consumption is high, and degree of automation is low, neither economy nor environmental protection.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an automatic earthworm bio-compost sludge treatment system and an application method thereof, which can effectively solve the problems in the prior art.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
an automatic earthworm bio-compost sludge treatment system comprises a biological leaching pretreatment system, a static decomposition pretreatment system, an automatic feeding system, a modular composting system and an earthworm/earthworm cocoon automatic screening and collecting system;
the bioleaching pretreatment system comprises: the pretreatment device comprises a pretreatment tank 11, a centrifugal pump 12, a liquid storage barrel 13, a sewage treatment device A14, a small pipe 15, a spray head A16, a sewage discharge pipeline 17 and a time control switch;
the pretreatment tank 11 adopts a brick-concrete structure, and the inner wall surface is subjected to anti-seepage treatment for placing sludge; a small pipe 15 and a spray head A16 connected with the small pipe 15 are arranged above the pretreatment tank 11, biological bacteria liquid is stored in the liquid storage barrel 13, the centrifugal pump 12 is controlled by a time control switch to pump the biological bacteria liquid to the small pipe 15 at regular time, and then the biological bacteria liquid is sprayed out from a spray head A16 and is scattered into the pretreatment tank 11;
the side of the bottom of the pretreatment tank 11 is provided with a sewage discharge hole 18, the sewage discharge hole 18 covers a sludge filter screen, the sewage discharge hole 18 is connected with a sewage discharge pipeline 17, after the pretreatment reaction of the biological bacteria liquid and the sludge is carried out, the generated leachate is conveyed to a sewage treatment device A14 through the sewage discharge pipeline 17 for treatment.
The static maturity pre-treatment system comprises: a fermentation tank 21, a horizontal mixer 22, a sludge lifting screw 23, an auxiliary material conveying belt 24, a material distributing belt 25, a strain feeding bin 26, an aeration pipe 28, a scroll fan 29, a biological filter 30 and an exhaust fan 31;
the fermentation tank 21 adopts a cement cast-in-place structure, the bottom of the fermentation tank is hardened by cement and is attached with an impermeable membrane;
sludge is conveyed to a feed inlet of the horizontal mixer 22 through a sludge lifting screw 23, crushed straw mushroom dreg auxiliary materials are conveyed to the feed inlet of the horizontal mixer 22 through an auxiliary material conveying belt 24 to be stirred, when the horizontal mixer 22 is opened, a strain feeding bin 26 opens a strain feeding port to mix and stir strains and raw and auxiliary materials, and the mixed materials are conveyed to a fermentation tank 21 through a material distribution belt 25 after being stirred.
The bottom of the fermentation tank 21 is divided into three equal parts by two rows of cement ditches 35, aeration pipes 28 are laid in the ditches, splayed aeration holes are formed in the lower portions of the pipe walls of the aeration pipes 28, and the aeration pipes 28 penetrate through the fermentation tank 21 and are connected with a scroll fan 29 for blast aeration.
After the mixed raw materials are fully paved in the fermentation tank 21, the upper part of the fermentation tank is covered with a polymer covering film 33, the molecular structure of the film material can enable water vapor to pass through the film, and malodorous gases such as ammonia gas, hydrogen sulfide and the like cannot pass through the film, so that the water is dissipated in the static decomposition process, and the odor does not run out, thereby achieving good fermentation effect;
the upper part of the side surface of the fermentation tank 21 close to the polymer membrane is provided with a circular opening which is externally connected with a gas collecting pipe 34, gas is pumped out by an exhaust fan 31, and malodorous gas is led into the biological filter 30 by a booster pump for biological deodorization.
The automatic feeding system comprises: a lifting screw device 41, a sludge storage bin 42, a spraying device 43, a conveying device 48 and a culture box 49;
the lifting screw 41 feeds the sludge into a sludge storage bin 42;
the spraying device 43 is provided with a spray head B44, the spray head B44 is positioned above the lifting screw device 41, and the spraying device 43 sprays biological bacteria liquid on the sludge while the lifting screw device 41 conveys the sludge;
an electronic meter 45 and a material limiter 40 are arranged in the sludge storage bin 42, an electronic hydraulic valve 46 and a photoelectric sensing device 47 are arranged at the bottom,
the material stopper 40 is used to monitor whether the sludge storage bin 42 is full, if so, the lifting screw 41 stops working, and if the sludge reaches the lowest position, the lifting screw 41 is started.
A conveying device 48 is laid below the electronic hydraulic valve 46, the conveying device 48 is used for conveying the cultivation box 49 to the position below the sludge storage bin 42, and the position of the cultivation box 49 is determined through the photoelectric sensing device 47;
the auxiliary materials are manually laid at the bottom of the cultivation box, an escape-proof net is attached to the auxiliary materials, and then the auxiliary materials are placed into a conveying device 48; the photoelectric sensing device 47 judges whether the breeding box 49 is right below, if so, the conveying device 48 is suspended, the electronic hydraulic valve 46 of the storage bin 42 is opened for loading, the electronic metering weight limit is reached, then the electronic hydraulic valve is closed, one-time boxing operation is completed, and the breeding box 49 is transported backwards;
the assembled breeding box 49 is placed on a transfer tray 50 with rollers, and after earthworms are manually thrown into the transfer tray, the earthworms are transferred to a modular composting system by a forklift.
The modular composting system comprises: the system comprises a sunlight greenhouse 51 with the height of 4 meters, the width of 6 meters and the length of 49 meters, a slide rail 52, a positive pressure fan 53, a negative pressure fan 54, a wet curtain cooling device 55, an online temperature and humidity monitoring device 56, a percolate collecting pipeline 58 and a sewage treatment facility 59;
the sunlight greenhouse 51 is provided with an inlet and an outlet, a slide rail 52 is laid in the sunlight greenhouse 51, the slide rail 52 extends from the inlet to the outlet, the electric forklift puts a transfer tray loaded with the cultivation box on the slide rail 52, the transfer tray slowly slides on the slide rail 52 through a pulley, and the earthworm cultivation is controlled to be carried out for 7 days from the time when the tray enters the sunlight greenhouse 51 to the time when the tray exits, so that the earthworm cultivation period is just 7 days.
The positive pressure fan 53 and the negative pressure fan 54 are arranged on two sides of the sunlight greenhouse 51 and are arranged on the side surface of the greenhouse, the positive pressure fan 53 is arranged on one side, the negative pressure fan 54 is arranged on the other side, and the positive pressure fan 53 is additionally provided with a wet curtain cooling device 55;
after the temperature and humidity range is set, the temperature and humidity online monitoring device 56 controls the opening and closing of the fan and the wet curtain cooling device; the purpose of controlling temperature and humidity is achieved.
A cement ground is adopted in the greenhouse, and an impermeable film is added for preventing seepage; the leachate is collected via leachate collection line 58 and sent to a wastewater treatment facility 59 for treatment.
The positive pressure fan 53 and the negative pressure fan 54 are arranged on two sides of the sunlight greenhouse 51 and are arranged on the side surface of the greenhouse, the positive pressure fan 53 is arranged on one side, the negative pressure fan 54 is arranged on the other side, and the positive pressure fan 53 is additionally provided with a wet curtain cooling device 55;
after the temperature and humidity range is set, the temperature and humidity online monitoring device 56 controls the opening and closing of the fan and the wet curtain cooling device; the purpose of controlling temperature and humidity is achieved.
The automatic earthworm/earthworm cocoon screening and collecting system is mainly used for separating and collecting earthworms after earthworm cultivation is finished;
automatic earthworm/earthworm cocoon screening collection system includes: a transmission belt 60, a motor 61, a height limiting scraper 62, an LED lamp 63, a feeding belt 64 and a vibrating screen 66;
the automatic earthworm/earthworm cocoon screening and collecting system is divided into 4 layers, each layer is provided with a transmission belt 60 and a motor 61 for controlling the transmission belt 60 to rotate, and two height limiting scrapers 62 and a plurality of LED lamps 63 are arranged above the transmission belt 60 of each layer; the height of the height-limiting scrapers 62 is changed from high to low according to the track height of the transmission belt 60, and the height difference between the two height-limiting scrapers 62 on the same layer is 2 cm.
Sludge materials with earthworms are taken out from a breeding box from the modular composting system and are placed on a feeding belt 64, the feeding belt 64 sends the materials to the highest layer of the earthworm/earthworm cocoon automatic screening and collecting system, the earthworms can move downwards under the irradiation of strong light of an LED lamp 63, the downward moving speed of the earthworms is matched with the conveying speed of a transmission belt 60, when the earthworms just move downwards for 2cm, the transmission belt just sends the materials to a height limiting scraper 62, the height difference between the height limiting scraper 62 and the transmission belt 60 scrapes the earthworms-free materials with the height of 2cm, and the process is repeated; until the materials are sent to the bottommost layer,
the transmission belt 60 at the bottommost layer is provided with a vibrating screen 66, holes of 3mm are uniformly distributed in the transmission belt 60, the thickness of the materials is only 6cm when the materials are conveyed to the positions, most of the materials are scraped, most of earthworms and a small amount of wormcast are left, the wormcast can be vibrated to fall in the holes of 3mm through the vibration of the vibrating screen 66 (the diameter of wormcast particles at the moment is smaller than 3mm, and the diameter of the earthworms is larger than 3mm), a wormcast collecting belt 67 is arranged below the transmission belt 60, the wormcast is conveyed to a collecting barrel, the earthworms are collected through a special earthworm collecting belt 68 after being conveyed to the tail end, and the wormcast collecting belt 67 and the earthworm collecting belt 68 are also provided with a motor 61 for transmission.
The lowest-layer wormcast collecting belt 68 is also responsible for collecting the wormcast which is scraped, the scraped wormcast is conveyed to the 4 th layer vibrating screen 66 belt along with the belt, the wormcast completely falls on the wormcast collecting belt 68 through the vibration of the vibrating screen 66, and the wormcast contains a large amount of earthworm cocoons for later incubation, so that the wormcast is collected and transferred to an automatic feeding system and is fed through an incubation box; and the collected earthworms are transported to a finished product packaging workshop for packaging and selling or deep processing.
Further, the strain feeding bin 26 is arranged above the horizontal mixer 22, an opening is formed in a steel plate on the upper portion of the horizontal mixer 22, the bottom of the strain feeding bin 26 is connected with the opening of the steel plate on the upper portion of the horizontal mixer 22, and fermentation strains can be directly fed into the horizontal mixer 22;
furthermore, the cement ditch 35 is used as a percolate collecting ditch, the bottom of the ditch is slightly inclined, and percolate flows to the percolate collecting port 32 along the cement ditch 35 and flows into a sewage treatment device B27 outside the fermentation tank 21 for treatment;
preferably, a blue light insect killing lamp 57 is arranged in every 25 square meters of the sunlight greenhouse 51 to kill the mosquitoes hatched from the breeding raw materials;
preferably, the modularized composting system can be used for earthworm cultivation and earthworm cocoon incubation simultaneously, both of which are fed by an automatic feeding system, the difference lies in the height and stacking layer number of the cultivation boxes, the cultivation boxes with the height of 18cm are stacked for 7 layers when earthworm cultivation is carried out, and the incubation boxes with the height of 7cm are stacked for 20 layers when earthworm cocoon incubation is carried out.
Further, the opening, closing and speed control of the motor 61 in the automatic earthworm/earthworm cocoon screening and collecting system are controlled in the whole process by the installed PLC control terminal 65, and the automatic operation is realized;
the application method of the automatic earthworm bio-compost sludge treatment system comprises the following steps:
after the raw and auxiliary materials enter the factory, sorting the raw and auxiliary materials according to the quality of the raw and auxiliary materials,
pretreating high-quality raw and auxiliary materials by a biological leaching pretreatment system;
pretreating inferior raw and auxiliary materials by a static decomposition pretreatment system;
after pretreatment, the raw and auxiliary materials enter an automatic feeding system to carry out earthworm box-type automatic feeding;
the earthworm box is ready for use after feeding; the earthworms are put into a modularized composting system and enter the modularized composting system, and the cultivation is finished for 7 days;
raw and auxiliary materials and earthworms in the earthworm breeding box enter an earthworm/earthworm cocoon automatic screening and collecting system to be sorted and collected, and three products, namely earthworms, earthworm cocoons and earthworm feces, are sorted and collected;
the sorted earthworms are put into a modular composting system again to be used as earthworm species according to the activity state of the earthworms, and the earthworms are packaged and sold in the activity state;
hatching the separated earthworm cocoons into small earthworms, and putting the small earthworms into a modularized composting system; the modular composting system is used for earthworm cultivation and earthworm incubation, the heights of boxes selected are different, the earthworm box type three-dimensional cultivation selects an earthworm cultivation box with the height of 18cm and can stack 7 layers, and the earthworm box type three-dimensional incubation selects an incubation box with the height of 7cm and can stack 20 layers.
Compared with the prior art, the invention has the advantages that:
the three-dimensional box type cultivation mode is adopted, so that the land use area can be saved, and the modularized management and flexible adjustment can be performed according to the production requirement;
two different pretreatment processes are adopted, real-time adjustment can be carried out according to different raw materials, and the safety of earthworm feeding raw materials is ensured;
the technology for thoroughly separating the parent and the offspring of the earthworms is solved, and a successful foundation is laid for developing the utilization of the earthworms on a large scale.
Can completely separate wormcast, earthworm eggs and earthworms at one time, ensures that more than 98 percent of pure wormcast can be obtained,
through adjusting indoor temperature, add different feed additive, realize the conversion between 3 different production purposes: firstly, earthworms are mainly produced; secondly, mainly producing the wormcast organic fertilizer; thirdly, the purpose of treating the waste is mainly achieved.
And a high-automation production mode is adopted, so that the labor is reduced, the cost is reduced, and the productivity is improved.
Drawings
FIG. 1 is a schematic diagram of a bioleaching pretreatment system according to an embodiment of the present invention;
FIG. 2 is a static state composting pretreatment system in accordance with an embodiment of the present invention;
FIG. 3 is an automatic feeding system according to an embodiment of the present invention;
FIG. 4 is a modular composting system according to an embodiment of the invention;
fig. 5 is a system for automatically screening and collecting earthworms/earthworm cocoons according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples.
An automatic earthworm bio-compost sludge treatment system comprises a biological leaching pretreatment system, a static decomposition pretreatment system, an automatic feeding system, a modular composting system and an earthworm/earthworm cocoon automatic screening and collecting system;
as shown in fig. 1, the bioleaching pretreatment system comprises: the pretreatment device comprises a pretreatment tank 11, a centrifugal pump 12, a liquid storage barrel 13, a sewage treatment device A14, a small pipe 15, a spray head A16, a sewage discharge pipeline 17 and a time control switch;
the pretreatment tank 11 adopts a brick-concrete structure, and the inner wall surface is subjected to anti-seepage treatment for placing sludge; a small pipe 15 and a spray head A16 connected with the small pipe 15 are arranged above the pretreatment tank 11, biological bacteria liquid is stored in the liquid storage barrel 13, the centrifugal pump 12 is controlled by a time control switch to pump the biological bacteria liquid to the small pipe 15 at regular time, and then the biological bacteria liquid is sprayed out from a spray head A16 and is scattered into the pretreatment tank 11;
the side of the bottom of the pretreatment tank 11 is provided with a sewage discharge hole 18, the sewage discharge hole 18 covers a sludge filter screen, the sewage discharge hole 18 is connected with a sewage discharge pipeline 17, after the pretreatment reaction of the biological bacteria liquid and the sludge is carried out, the generated leachate is conveyed to a sewage treatment device A14 through the sewage discharge pipeline 17 for treatment.
As shown in fig. 2, the static state maturing pretreatment system includes: a fermentation tank 21, a horizontal mixer 22, a sludge lifting screw 23, an auxiliary material conveying belt 24, a material distribution belt 25, a strain feeding bin 26, a sewage treatment device B27, an aeration pipe 28, a scroll fan 29, a biological filter 30 and an exhaust fan 31;
the fermentation tank 21 adopts a cement cast-in-place structure, the bottom of the fermentation tank is hardened by cement and is attached with an impermeable membrane;
the sludge is conveyed to a feed inlet of the horizontal mixer 22 through a sludge lifting screw 23, auxiliary materials such as crushed straw mushroom dregs are conveyed to the feed inlet of the horizontal mixer 22 through an auxiliary material conveying belt 24 to be stirred, when the horizontal mixer 22 is opened, a strain feeding bin 26 opens a strain feeding port to mix and stir strains and raw and auxiliary materials, and the mixed materials are conveyed to a fermentation tank 21 through a material distribution belt 25 after being stirred.
The strain feeding bin 26 is arranged above the horizontal mixer 22, an opening is formed in a steel plate at the upper part of the horizontal mixer 22, the bottom of the strain feeding bin 26 is connected with the opening of the steel plate at the upper part of the horizontal mixer 22, and fermentation strains can be directly fed into the horizontal mixer 22;
the bottom of the fermentation tank 21 is divided into three equal parts by two rows of cement ditches 35, aeration pipes 28 are laid in the ditches, splayed aeration holes are formed below the pipe walls of the aeration pipes 28, and the aeration pipes 28 penetrate through the fermentation tank 21 and are connected with a scroll fan 29 for blast aeration;
the cement ditch 35 is used as a percolate collecting ditch, the bottom of the ditch is slightly inclined, and percolate flows to the percolate collecting port 32 along the cement ditch 35 and flows into a sewage treatment device B27 outside the fermentation tank 21 for treatment;
after the mixed raw materials are fully paved in the fermentation tank 21, the upper part of the fermentation tank is covered with a polymer covering film 33, the molecular structure of the film material can enable water vapor to pass through the film, and malodorous gases such as ammonia gas, hydrogen sulfide and the like cannot pass through the film, so that the water is dissipated in the static decomposition process, and the odor does not run out, thereby achieving good fermentation effect;
a circular opening is arranged at the upper part of the side surface of the fermentation tank 21 close to the polymer membrane, the circular opening is externally connected with a gas collecting pipe 34, gas is pumped out through an exhaust fan 31, and malodorous gas is led into the biological filter 30 by a booster pump for biological deodorization;
as shown in fig. 3, the automatic feeding system includes: a lifting screw device 41, a sludge storage bin 42, a spraying device 43, a conveying device 48 and a culture box 49;
the lifting screw 41 feeds the sludge into a sludge storage bin 42,
the spraying device 43 is provided with a spray head B44, a spray head B44 is positioned above the lifting screw device 41, the spraying device 43 sprays biological bacteria liquid on the sludge while the lifting screw device 41 conveys the sludge,
an electronic meter 45 and a material limiter 40 are arranged in the sludge storage bin 42, an electronic hydraulic valve 46 and a photoelectric sensing device 47 are arranged at the bottom,
the material stopper 40 is used to monitor whether the sludge storage bin 42 is full, if so, the lifting screw 41 stops working, and if the sludge reaches the lowest position, the lifting screw 41 is started.
A conveying device 48 is laid below the electronic hydraulic valve 46, the conveying device 48 is used for conveying the cultivation box 49 to the position below the sludge storage bin 42, and the position of the cultivation box 49 is determined through the photoelectric sensing device 47;
the auxiliary materials are manually laid at the bottom of the cultivation box, an escape-proof net is attached to the auxiliary materials, and then the auxiliary materials are placed into a conveying device 48; the photoelectric sensing device 47 judges whether the breeding box 49 is right below, if so, the conveying device 48 is suspended, the electronic hydraulic valve 46 of the storage bin 42 is opened for loading, the electronic metering weight limit is reached, then the electronic hydraulic valve is closed, one-time boxing operation is completed, and the breeding box 49 is transported backwards;
the assembled breeding box 49 is placed on a transfer tray 50 with rollers, and after earthworms are manually thrown into the transfer tray, the earthworms are transferred to a modular composting system by a forklift.
As shown in fig. 4, the modular composting system comprises a sunlight greenhouse 51 with a height of 4 meters, a width of 6 meters and a length of 49 meters, a slide rail 52, a positive pressure fan 53, a negative pressure fan 54, a wet curtain cooling device 55, an online temperature and humidity monitoring device 56, a percolate collecting pipeline 58 and a sewage treatment facility 59;
the sunlight greenhouse 51 is provided with an inlet and an outlet, a slide rail 52 is laid in the sunlight greenhouse 51, the slide rail 52 extends from the inlet to the outlet, the electric forklift puts a transfer tray loaded with the cultivation box on the slide rail 52, the transfer tray slowly slides on the slide rail 52 through a pulley, and the earthworm cultivation is controlled to be carried out for 7 days from the time when the tray enters the sunlight greenhouse 51 to the time when the tray exits, so that the earthworm cultivation period is just 7 days.
The positive pressure fan 53 and the negative pressure fan 54 are arranged on two sides of the sunlight greenhouse 51 and are arranged on the side surface of the greenhouse, the positive pressure fan 53 is arranged on one side, the negative pressure fan 54 is arranged on the other side, and the positive pressure fan 53 is additionally provided with a wet curtain cooling device 55;
after the temperature and humidity range is set, the temperature and humidity online monitoring device 56 controls the opening and closing of the fan and the wet curtain cooling device; the purpose of controlling temperature and humidity is achieved.
A blue light insect killing lamp 57 is arranged in each 25 square meters of the sunlight greenhouse 51 to kill the mosquitoes hatched from the cultivation raw materials;
a cement ground is adopted in the greenhouse, and an impermeable film is added for preventing seepage;
the modularization compost system can be used for earthworm cultivation and earthworm cocoon hatching simultaneously, and both feed through automatic feeding system, and the difference lies in the height and the pile number of piles of breed case, adopts the breed case of high 18cm to pile up 7 layers when carrying out earthworm cultivation, and when carrying out earthworm cocoon hatching, adopts the incubator of high 7cm to pile up 20 layers.
The leachate is collected via leachate collection line 58 and sent to a wastewater treatment facility 59 for treatment.
As shown in fig. 5, the automatic earthworm/earthworm cocoon screening and collecting system is mainly used for separating and collecting earthworms after earthworm cultivation is completed, and is designed by means of the light-shielding property of the earthworms;
automatic earthworm/earthworm cocoon screening collection system includes: the device comprises a transmission belt 60, a motor 61, a height limiting scraper 62, an LED lamp 63, a feeding belt 64, a PLC control terminal 65 and a vibrating screen 66;
the automatic earthworm/earthworm cocoon screening and collecting system is divided into 4 layers, each layer is provided with a transmission belt 60 and a motor 61 for controlling the transmission belt 60 to rotate, and two height limiting scrapers 62 and a plurality of LED lamps 63 are arranged above the transmission belt 60 of each layer; the height of the height limiting scraper 62 is changed from high to low according to the track height of the transmission belt 60, and the height difference between the height limiting scraper 62 and the height limiting scraper 62 is 2 cm.
Sludge materials with earthworms are taken out from a breeding box from the modular composting system and are placed on a feeding belt 64, the feeding belt 64 sends the materials to the highest layer of the earthworm/earthworm cocoon automatic screening and collecting system, the earthworms can move downwards under the irradiation of strong light of an LED lamp 63, the downward moving speed of the earthworms is matched with the conveying speed of a transmission belt 60, when the earthworms just move downwards for 2cm, the transmission belt just sends the materials to a height limiting scraper 62, the height difference between the height limiting scraper 62 and the transmission belt 60 scrapes the earthworms-free materials with the height of 2cm, and the process is repeated; until the materials are sent to the bottommost layer,
the transmission belt 60 at the bottommost layer is provided with a vibrating screen 66, holes of 3mm are uniformly distributed in the transmission belt 60, the thickness of the materials is only 6cm when the materials are conveyed to the positions, most of the materials are scraped, most of earthworms and a small amount of wormcast are left, the wormcast can be vibrated to fall in the holes of 3mm through the vibration of the vibrating screen 66 (the diameter of wormcast particles at the moment is smaller than 3mm, and the diameter of the earthworms is larger than 3mm), a wormcast collecting belt 67 is arranged below the transmission belt 60, the wormcast is conveyed to a collecting barrel, the earthworms are collected through a special earthworm collecting belt 68 after being conveyed to the tail end, and the wormcast collecting belt 67 and the earthworm collecting belt 68 are also provided with a motor 61 for transmission.
The whole process of opening, closing and speed control of the conveyor belt motor 61 in the system is controlled by a PLC control terminal 65, and the full-automatic operation is realized;
the earthworm collecting belt at the lowest layer is also responsible for collecting the scraped earthworm cast, the scraped earthworm cast is conveyed to the belt of the 4 th layer of vibrating screen 66 along with the belt, the whole part falls on the earthworm cast collecting belt 68 through the vibration of the vibrating screen 66, and the earthworm cast contains a large amount of earthworm cocoons for later incubation, so that the earthworm cast is collected and transported to an automatic feeding system for feeding through an incubator; and the collected earthworms are transported to a finished product packaging workshop for packaging and selling or deep processing.
The process flow of the automatic earthworm bio-compost sludge treatment system is as follows:
after the raw and auxiliary materials enter the factory, sorting the raw and auxiliary materials according to the quality of the raw and auxiliary materials,
pretreating high-quality raw and auxiliary materials by a biological leaching pretreatment system;
pretreating inferior raw and auxiliary materials by a static decomposition pretreatment system;
after pretreatment, the raw and auxiliary materials enter an automatic feeding system to carry out earthworm box-type automatic feeding;
the earthworm box is ready for use after feeding; the earthworms are put into a modularized composting system and enter the modularized composting system, and the cultivation is finished after 7 days;
raw and auxiliary materials and earthworms in the earthworm breeding box enter an earthworm/earthworm cocoon automatic screening and collecting system to be sorted and collected, and three products, namely earthworms, earthworm cocoons and earthworm feces, are sorted and collected;
the sorted earthworms are put into a modular composting system again to be used as earthworm species according to the activity state of the earthworms, and the earthworms are packaged and sold in the activity state;
hatching the separated earthworm cocoons into small earthworms, and putting the small earthworms into a modularized composting system; the modular composting system is used for earthworm cultivation and earthworm incubation, and is only different in height of selected boxes, an earthworm cultivation box with the height of 18cm can be stacked for 7 layers, and an earthworm cultivation box with the height of 7cm can be stacked for 20 layers;
and finally, naturally drying the selected wormcast in a ventilating way, and selling the wormcast after the moisture content is reduced to below 40%. The drying device and the drying method refer to Chinese invention patents: the name is an automatic greenhouse earthworm cast ventilation drying system, and the application number is 201810309291.0.
It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner in which the invention is practiced, and it is to be understood that the scope of the invention is not limited to such specifically recited statements and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (7)
1. An automatic earthworm bio-compost sludge treatment system, comprising: the system comprises a biological leaching pretreatment system, a static decomposing pretreatment system, an automatic feeding system, a modular composting system and an earthworm/earthworm cocoon automatic screening and collecting system;
the bioleaching pretreatment system comprises: the device comprises a pretreatment tank (11), a centrifugal pump (12), a liquid storage barrel (13), a sewage treatment device A (14), a small pipe (15), a spray head A (16), a sewage discharge pipeline (17) and a time control switch;
the pretreatment tank (11) adopts a brick-concrete structure, and the inner wall surface is subjected to anti-seepage treatment for placing sludge; a small pipe (15) and a spray head A (16) connected with the small pipe (15) are arranged above the pretreatment tank (11), biological bacteria liquid is stored in a liquid storage barrel (13), the centrifugal pump (12) is controlled by a time switch in a timing mode to pump the biological bacteria liquid to the small pipe (15), and then the biological bacteria liquid is sprayed out of the spray head A (16) and is scattered into the pretreatment tank (11);
a sewage discharge hole (18) is formed in the side face of the bottom of the pretreatment tank (11), the sewage discharge hole (18) covers a sludge filter screen, the sewage discharge hole (18) is connected with a sewage discharge pipeline (17), and after the pretreatment reaction of the biological bacteria liquid and the sludge is carried out, the generated leachate is conveyed to a sewage treatment device A (14) through the sewage discharge pipeline (17) for treatment;
the static maturity pre-treatment system comprises: a fermentation tank (21), a horizontal mixer (22), a sludge lifting screw (23), an auxiliary material conveying belt (24), a material distribution belt (25), a strain feeding bin (26), an aeration pipe (28), a scroll fan (29), a biological filter (30) and an exhaust fan (31);
the fermentation tank (21) adopts a cement cast-in-place structure, the bottom of the fermentation tank is hardened by cement and is attached with an impermeable membrane;
the method comprises the following steps of (1) conveying sludge to a horizontal mixer (22) through a sludge lifting screw (23), conveying crushed straw mushroom dreg auxiliary materials to a feed inlet of the horizontal mixer (22) through an auxiliary material conveying belt (24) for stirring, opening a strain feeding opening of a strain feeding bin (26) while the horizontal mixer (22) is opened, mixing and stirring strains and raw and auxiliary materials, and conveying the mixture to a fermentation tank (21) through a material distribution belt (25) after stirring is completed;
the bottom of the fermentation tank (21) is divided into three equal parts by two rows of cement ditches (35), aeration pipes (28) are laid in the ditches, splayed aeration holes are formed below the pipe walls of the aeration pipes (28), and the aeration pipes (28) penetrate through the fermentation tank (21) to be connected with a scroll fan (29) for blast aeration;
after the mixed raw materials are fully paved in the fermentation tank (21), the upper part of the fermentation tank is covered with a polymer covering film (33), the molecular structure of the film material enables water vapor to pass through the film, but malodorous gas cannot pass through the film, so that water is dissipated in the static decomposition process, odor does not run out, and a good fermentation effect is achieved;
a round opening is arranged at the upper part of the side surface of the fermentation tank (21) close to the polymer membrane, the round opening is externally connected with a gas collecting pipe (34), gas is pumped out by an exhaust fan (31), and malodorous gas is led into the biological filter (30) by a booster pump for biological deodorization;
the automatic feeding system comprises: a lifting screw device (41), a sludge storage bin (42), a spraying device (43), a conveying device (48) and a culture box (49);
the lifting screw device (41) sends the sludge into a sludge storage bin (42);
the spraying device (43) is provided with a spray head B (44), the spray head B (44) is positioned above the lifting screw device (41), and the spraying device (43) sprays biological bacteria liquid on the sludge while the lifting screw device (41) conveys the sludge;
an electronic meter (45) and a material limiter (40) are arranged in the sludge storage bin (42), an electronic hydraulic valve (46) and a photoelectric sensing device (47) are arranged at the bottom,
the material limiter (40) is used for monitoring whether the sludge storage bin (42) is full, if so, the lifting screw device (41) stops working, and if the sludge reaches the lowest position, the lifting screw device (41) is started;
a conveying device (48) is laid below the electronic hydraulic valve (46), the conveying device (48) is used for conveying the cultivation box (49) to the position below the sludge storage bin (42), and the position of the cultivation box (49) is determined through a photoelectric sensing device (47);
auxiliary materials are laid at the bottom of the cultivation box manually, an escape-proof net is attached to the auxiliary materials, and then the auxiliary materials are placed into a conveying device (48); the photoelectric sensing device (47) judges whether the cultivation box (49) is positioned right below, if so, the conveying device (48) is suspended, the electronic hydraulic valve (46) of the storage bin (42) is opened for charging, the electronic hydraulic valve is closed after reaching the electronic metering weight limit, one-time boxing operation is completed, and the cultivation box (49) is transported backwards;
placing the loaded breeding box (49) on a transfer tray (50) with rollers, and transferring the breeding box into a modular composting system by a forklift after earthworms are manually put into the transportation tray;
the modular composting system comprises: the system comprises a sunlight greenhouse (51) with the height of 4 meters, the width of 6 meters and the length of 49 meters, a slide rail (52), a positive pressure fan (53), a negative pressure fan (54), a wet curtain cooling device (55), a temperature and humidity online monitoring device (56), a percolate collecting pipeline (58) and a sewage treatment facility (59);
the greenhouse is characterized in that the sunlight greenhouse (51) is provided with an inlet and an outlet, a slide rail (52) is laid in the sunlight greenhouse (51), the slide rail (52) extends from the inlet to the outlet, an electric forklift puts a transfer tray carrying the cultivation box on the slide rail (52), the transfer tray slowly slides on the slide rail (52) through a pulley, and earthworms are cultivated for exactly 7 days after entering the sunlight greenhouse (51) to the outlet;
a positive pressure fan (53) and a negative pressure fan (54) are arranged on two sides of the sunlight greenhouse (51), the sunlight greenhouse is placed on the side surface of the greenhouse, the positive pressure fan (53) is arranged on one side, the negative pressure fan (54) is arranged on the other side, and the positive pressure fan (53) is additionally provided with a wet curtain cooling device (55);
after the temperature and humidity range is set, the temperature and humidity online monitoring device (56) controls the opening and closing of the fan and the wet curtain cooling device; the purpose of controlling temperature and humidity is achieved;
a cement ground is adopted in the greenhouse, and an impermeable film is added for preventing seepage; the percolate is collected by a percolate collecting pipeline (58) and sent to a sewage treatment facility (59) for treatment;
the automatic earthworm/earthworm cocoon screening and collecting system is mainly used for separating and collecting earthworms after earthworm cultivation is finished;
automatic earthworm/earthworm cocoon screening collection system includes: the device comprises a transmission belt (60), a motor (61), a height limiting scraper (62), an LED lamp (63), a feeding belt (64) and a vibrating screen (66);
the automatic earthworm/earthworm cocoon screening and collecting system is divided into 4 layers, each layer is provided with a transmission belt (60) and a motor (61) for controlling the transmission belt (60) to rotate, and two height limiting scrapers (62) and a plurality of LED lamps (63) are arranged above the transmission belt (60) of each layer; the height of the height limiting scrapers (62) is changed from high to low according to the track height of the transmission belt (60), and the height difference between the two height limiting scrapers (62) on the same layer is 2 cm;
sludge materials with earthworms are taken out from a breeding box from a modular composting system and are placed on a feeding belt (64), the feeding belt (64) sends the materials to the highest layer of an earthworm/earthworm cocoon automatic screening and collecting system, the earthworms can move downwards under the irradiation of strong light of an LED lamp (63), the downward moving speed of the earthworms is matched with the conveying speed of a transmission belt (60), when the earthworms move downwards for 2cm, the transmission belt just sends the materials to the position of a height limiting scraper (62), the height difference between the height limiting scraper (62) and the transmission belt (60) scrapes the earthworms materials with the height of 2cm, and the process is repeated; until the materials are sent to the bottommost layer;
the bottom layer of the transmission belt (60) is provided with a vibrating screen (66), holes with the thickness of 3mm are uniformly distributed on the transmission belt (60), when materials are conveyed to the holes, the thickness of the materials is only 6cm, most of the materials are scraped off at the moment, most of earthworms and a small amount of wormcast are left, the wormcast is vibrated through the vibrating screen (66) and falls into the holes with the thickness of 3mm, a wormcast collecting belt (67) is arranged below the transmission belt (60), the wormcast is conveyed into a collecting barrel, the earthworms are conveyed to the tail end and then collected through a special earthworm collecting belt (68), and the wormcast collecting belt (67) and the earthworm collecting belt (68) are also provided with a motor (61) for transmission;
the lowest layer of wormcast collecting belt (68) is also responsible for collecting the wormcast which is scraped, the scraped wormcast is conveyed to the 4 th layer of vibrating screen (66) belt along with the belt, the wormcast completely falls on the wormcast collecting belt (68) through the vibration of the vibrating screen (66), and the wormcast contains a large amount of earthworm cocoons and is used for later incubation, so the wormcast is collected and transported to an automatic feeding system and is fed through an incubation box; and the collected earthworms are transported to a finished product packaging workshop for packaging and selling or deep processing.
2. The automated earthworm bio-compost sludge disposal system of claim 1, wherein: the strain feeding bin (26) is arranged above the horizontal mixer (22), an upper steel plate opening of the horizontal mixer (22) is formed, the bottom of the strain feeding bin (26) is connected with the upper steel plate opening of the horizontal mixer (22), and fermentation strains can be directly fed into the horizontal mixer (22).
3. The automated earthworm bio-compost sludge disposal system of claim 1, wherein: the cement ditch (35) is used as a percolate collecting ditch, the bottom of the ditch is slightly inclined, and percolate flows to the percolate collecting port (32) along the cement ditch (35) and flows into a sewage treatment device B (27) outside the fermentation tank (21) for treatment.
4. The automated earthworm bio-compost sludge disposal system of claim 1, wherein: and a blue light insect killing lamp (57) is arranged in each 25 square meters of the sunlight greenhouse (51) to kill the mosquitoes hatched from the cultivation raw materials.
5. The automated earthworm bio-compost sludge disposal system of claim 1, wherein: the modularization compost system is used for earthworm cultivation and earthworm cocoon hatching simultaneously, and both are reinforced through automatic feeding system, and the difference lies in the height and the pile number of piles of breed case, adopts the breed case of high 18cm to pile up 7 layers when carrying out earthworm cultivation, and when carrying out earthworm cocoon hatching, adopts the incubator of high 7cm to pile up 20 layers.
6. The automated earthworm bio-compost sludge disposal system of claim 1, wherein: the opening, closing and speed control of a motor (61) in the automatic earthworm/earthworm cocoon screening and collecting system are controlled in the whole process through an installed PLC control terminal (65), and the automatic operation is realized.
7. The method of using the system for automated earthworm bio-compost sludge disposal according to claims 1 to 6, comprising the steps of:
after the raw and auxiliary materials enter the factory, sorting the raw and auxiliary materials according to the quality of the raw and auxiliary materials,
pretreating high-quality raw and auxiliary materials by a biological leaching pretreatment system;
pretreating inferior raw and auxiliary materials by a static decomposition pretreatment system;
after pretreatment, the raw and auxiliary materials enter an automatic feeding system to carry out earthworm box-type automatic feeding;
the earthworm box is ready for use after feeding; the earthworms are put into a modularized composting system and enter the modularized composting system, and the cultivation is finished for 7 days;
raw and auxiliary materials and earthworms in the earthworm breeding box enter an earthworm/earthworm cocoon automatic screening and collecting system to be sorted and collected, and three products, namely earthworms, earthworm cocoons and earthworm feces, are sorted and collected;
the sorted earthworms are put into a modular composting system again to be used as earthworm species according to the activity state of the earthworms, and the earthworms are packaged and sold in the activity state;
hatching the separated earthworm cocoons into small earthworms, and putting the small earthworms into a modularized composting system; the modular composting system is used for earthworm cultivation and earthworm incubation, and is only different in height of selected boxes, the earthworm box type three-dimensional cultivation selects an earthworm cultivation box with the height of 18cm to stack 7 layers, and the earthworm box type three-dimensional incubation selects an incubation box with the height of 7cm to stack 20 layers.
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| CN109819945A (en) * | 2019-03-30 | 2019-05-31 | 安徽农农乐农业科技有限公司 | Earthworm bed material preparation method |
| CN109937974B (en) * | 2019-04-18 | 2023-10-13 | 中国环境科学研究院 | A device for replacing soil with earthworms |
| CN110199953B (en) * | 2019-04-30 | 2021-07-09 | 江苏思威博生物科技有限公司 | An automatic feeding device for fly maggot breeding |
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