CN116199327A - Movable biological membrane sewage treatment device and method - Google Patents
Movable biological membrane sewage treatment device and method Download PDFInfo
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- CN116199327A CN116199327A CN202310135194.5A CN202310135194A CN116199327A CN 116199327 A CN116199327 A CN 116199327A CN 202310135194 A CN202310135194 A CN 202310135194A CN 116199327 A CN116199327 A CN 116199327A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/08—Aerobic processes using moving contact bodies
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F7/00—Aeration of stretches of water
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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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Hydrology & Water Resources (AREA)
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- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a movable biological membrane sewage treatment device and a movable biological membrane sewage treatment method, wherein the movable biological membrane sewage treatment device comprises a reactor body, a sewage inlet and a sewage outlet are arranged on the reactor body, a combined suspension filler is arranged in the reactor body, a rotary shaft extending leftwards and rightwards is arranged in the reactor body, a plurality of groups of stirring blades are arranged on the rotary shaft at intervals from left to right, each group of stirring blades consists of 2-8 mechanical net blades, the mechanical net blades are of a gourd ladle-shaped structure, the 2-8 mechanical net blades are arranged on the same circumference, the direction of a gourd ladle opening of the mechanical net blades is consistent with the rotation direction of the rotary shaft, and a plurality of filter holes which can supply water to filter out the water and have the aperture smaller than the diameter of the filler are arranged on the mechanical net blades. The organic pollutant removing efficiency is high, the denitrification effect is good, the cost is low, the system operation is stable, the operation cost is low, and the operation and control are simple and convenient.
Description
Technical Field
The invention relates to a sewage treatment device and a sewage treatment method by using movable biological membranes, and belongs to the technical field of sewage treatment.
Background
The contact oxidation method is a novel biochemical treatment method for wastewater, which has the characteristics of an activated sludge method and a biomembrane method. The main equipment of the method is a biological contact oxidation filter. The aeration Chi Zhongzhuang which is airtight is filled with fillers such as coke, gravel, plastic honeycomb, plastic combined fiber and the like, the fillers are immersed in water, and aeration oxygenation is carried out on the bottoms of the fillers by using a blower, and the mode is called blast aeration; air can entrain wastewater to be treated from bottom to top, the wastewater freely passes through the filter material part to reach the water surface, and after the air escapes, the wastewater returns to the bottom of the tank from top to bottom in the filter material compartment. The activated sludge is attached to the surface of the filler and cannot flow along with water, and the biological film is directly and strongly stirred by the upward airflow and is continuously updated, so that the purifying effect is improved.
At present, the filler is fixed in the tank body through a filler frame, the biomembrane can only fall off by itself, the residual sludge is not easy to drain away, and the water quality is easy to deteriorate due to retention between filter materials, so that the treatment effect is affected. And the phenomena of filler collapse, filler blockage and short flow are easy to occur, the filler is required to be removed by draining, the filler is fixed, the aeration disc is easy to damage, the water is required to be drained, and the aeration disc is replaced after the fixed filler is removed. And the blower needs maintenance; pipelines and valves also need to be maintained, the operation is complex, the running and maintenance costs are high, and the equipment investment is high.
Disclosure of Invention
In view of the above problems, a first object of the present invention is to provide an active biofilm sewage treatment device, and a second object is to provide an active biofilm sewage treatment method, which has high organic pollutant removal efficiency, good denitrification effect, low cost, stable system operation, low operation cost, and simple and convenient operation and control.
In order to achieve the first object, the technical scheme of the invention is as follows: the utility model provides a movable biomembrane sewage treatment plant, includes the reactor body, be provided with sewage import and sewage export on the reactor body, its characterized in that: the reactor is characterized in that a combined suspension ball filler is placed in the reactor body, a rotating shaft extending left and right is arranged in the reactor body, a plurality of groups of stirring blades are arranged on the rotating shaft at intervals from left to right, each group of stirring blades consists of 2-8 mechanical net blades, the mechanical net blades are of a gourd ladle-shaped structure, the 2-8 mechanical net blades are installed on the same circumference, the direction of a gourd ladle opening of each mechanical net blade is consistent with the rotating direction of the rotating shaft, and a plurality of filter holes capable of supplying water to filter out the filler diameter are formed in each mechanical net blade.
The introduced sewage is subjected to biological adsorption, biological aerobic treatment and biological anoxic nitrogen removal treatment in the movable biological membrane sewage treatment device, and the sludge-water mixture subjected to biological oxidation and anoxic nitrogen removal treatment enters the next process treatment from the sewage discharge port.
The dissolved oxygen of sewage in the bioreactor can be supplemented by the rotation of the mechanical net blades, and along with the rotation of the blades, part of combined suspended ball filler is reserved in the blades of the ladle type and leaves the water surface, so that on one hand: sewage in the combined suspension ball filler flows down in blades which are rotationally separated from the water surface to form drop aeration; on the other hand: after the combined suspension ball filler leaves the water surface, microorganisms attached to the filler obtain sufficient oxygen in the air; in addition, as the blades rotate, the filler slides into the sewage, causing water bloom to also reoxygenate the sewage in the bioreactor.
In addition, mechanical web blade rotation may also facilitate movement of the combined suspended sphere packing in the bioreactor. The mechanical net blades rotate at a low speed to push the combined suspended ball filler to move in the bioreactor, so that the contact between microorganisms attached to the combined suspended ball filler and pollutants in sewage is increased.
Because the combined suspending ball filler has large specific surface area, a large amount of biological strains can be attached, and the biological strains consume organic pollutants, nitrogen, phosphorus nutrient substances and dissolved oxygen in sewage inflow water in the metabolism process, and can simultaneously carry out carbonization, nitrification and denitrification of the organic matters, thereby effectively removing the pollutants in the sewage and improving the removal efficiency of the pollutants.
The microorganism adheres to the surface of the filler and grows, and along with the thickening of the microorganism adhesion layer, an anoxic layer (even an anaerobic layer) and an aerobic layer are sequentially formed from inside to outside by the microorganism film, so that the anoxic denitrification biological reaction and the aerobic biological reaction can be simultaneously carried out, and the better pollutant removal effect is achieved.
The combined suspended ball filler added into the bioreactor moves continuously in the reactor under the action of rotary stirring of the mechanical net blades, and the biomembrane attached to the surface of the filler is continuously fallen and updated in collision, so that the activity of the biomembrane is maintained, and the biological treatment effect is improved.
The stirring blade and the rotating shaft can be made of stainless steel, carbon steel (subjected to corrosion-resistant treatment), alloy or nonmetallic materials.
In the scheme, the method comprises the following steps: the sewage inlet and the sewage outlet are respectively positioned at the left side and the right side of the reactor body. The vertical partition board at the bottom of the other side of the sewage inlet and outlet is provided with water holes at the upper end, so that the flow direction path of sewage in the bioreactor is increased.
In the scheme, the method comprises the following steps: the two ends of the rotating shaft are respectively arranged on the left side wall and the right side wall of the reactor body through bearings, and one end of the rotating shaft extends out of the reactor body and is connected with a motor with a speed reducer. The motor selects a variable frequency speed regulating motor, and is provided with a frequency converter, so that the rotating speed can be flexibly regulated according to the actual working condition.
In the scheme, the method comprises the following steps: the reactor is characterized in that a vertical partition plate extending back and forth is arranged in the reactor body, a water passing hole is formed in the bottom of the other side of the water inlet and outlet on the vertical partition plate, and a filter screen is arranged on the water passing hole and the sewage outlet. The pore diameter of the filter screen is smaller than the diameter of the filler. The pore diameter of the filter screen is 10-50mm, and the filter screen is used for intercepting and preventing the filler from flowing out.
In the scheme, the method comprises the following steps: the sewage inlet, the water passing hole and the sewage outlet are staggered up and down.
In the scheme, the method comprises the following steps: the aperture of the filtering holes of the mechanical net leaf is 10-30mm, the hole spacing is 30-50mm, the diameter of the combined suspension ball filler is 80-150mm, and the specific surface area of the combined suspension ball filler is more than 800m 2 /m 3 。
In the scheme, the method comprises the following steps: an online dissolved oxygen meter is arranged in the reactor body, and is connected with a control system to realize the online monitoring and control of the dissolved oxygen in the bioreactor.
In the scheme, the method comprises the following steps: each group of stirring blades consists of 3-4 mechanical net blades.
The second object of the present invention is achieved by: a sewage treatment method of movable biological membranes is characterized in that: sewage enters the movable biomembrane sewage treatment device from the sewage inlet, the mechanical net leaf part is immersed in the sewage, the stirring speed is controlled to be 0.2-20 r/min, the stirring speed is controlled to rotate at a low speed, oxygen is continuously supplemented into the reactor body, and the sewage is discharged from the sewage outlet after fully contacting and reacting with the filler.
In the scheme, the method comprises the following steps: the maximum depth of immersion of the mechanical net leaf can reach two-thirds to four-fifths of the length of the mechanical net leaf.
For modular design and operation, the bioreactor can be operated in series, parallel or a combination of series and parallel according to the sewage treatment process, so as to achieve the working conditions of adapting to different sewage quantities, different water qualities and the like and achieve better pollutant removal effect.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the processes of adsorption of microorganisms on pollutants, biological aerobic treatment, biological anoxic nitrogen removal treatment and the like in the same bioreactor, realizes the alternate contact of microorganisms attached to the surface of the combined suspended ball filler in sewage and air through slow rotation of mechanical net blades, and achieves the purposes of reoxygenation of sewage such as drop of the combined suspended ball filler, drop exposure of sewage and the like, wherein the microorganisms attached to the surface of the combined suspended ball filler adsorb organic matters in water when immersed, absorb oxygen in the atmosphere when exposed in the air, and have the continuous alternating process of oxygen enrichment and oxygen deficiency, thereby being beneficial to oxidizing and decomposing the adsorbed organic matters and performing biological denitrification treatment on the sewage, thereby achieving the purpose of purifying water quality. The rotation of the mechanical net blades drives air and causes turbulent motion of sewage in the biochemical reactor, thereby promoting the uniform distribution of dissolved oxygen of sewage in the reactor. The invention omits aeration equipment, a fan house and a pipeline system which are needed in sewage treatment, so that the process has the advantages of less equipment quantity, less maintenance workload, small occupied area and construction cost reduction; according to the invention, the microorganisms are fully contacted with sewage by rotating the mechanical net blades, and COD, BOD and TN are absorbed and degraded by the microorganisms, so that the organic pollutant removal efficiency is high, and the denitrification effect is good; the invention has simple process flow, simple and convenient operation and control, can form an active biological film on the surface of the combined suspension ball filler, effectively prevent sludge expansion, can perform serial, parallel or serial-parallel combined operation according to the sewage treatment process requirement, and can flexibly strengthen the functions of the treatment units; the invention has good sewage treatment effect and good effluent quality, and can effectively reduce the running cost of sewage treatment.
Drawings
Fig. 1 is a top view of the present invention.
Fig. 2 is a cross-sectional view of A-A of fig. 1.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in figures 1 and 2, the movable biological membrane sewage treatment device comprises a reactor body 1, wherein a sewage inlet 2 and a sewage outlet 3 are arranged on the reactor body, the sewage inlet and the sewage outlet are respectively positioned at the upper ends of the left side and the right side of the reactor body, a combined suspension filler 10 is arranged in the reactor body, the diameter of the combined suspension ball filler is 80-150mm, and the specific surface area of the combined suspension ball filler is more than 800m 2 /m 3 。
A rotary shaft 5 extending leftwards and rightwards is arranged in the reactor body 1, two ends of the rotary shaft 5 are respectively arranged on the left side wall and the right side wall of the reactor body through bearings, and one end of the rotary shaft extends out of the reactor body and is connected with a motor 6 with a speed reducer. The motor is a variable-frequency speed-regulating motor.
A plurality of groups of stirring blades are arranged on the rotating shaft 5 at intervals from left to right, and 2 to 8 groups of stirring blades can be arranged according to the length of the reactor body 1. Each set of stirring blades consists of 2-8 mechanical wire blades 4, preferably 3-4 mechanical wire blades 4. The mechanical net blades 4 are of a gourd ladle-shaped structure, the 2-8 mechanical net blades 4 are arranged on the same circumference, the directions of gourd ladle mouths of the mechanical net blades 4 are consistent with the rotation direction of the rotating shaft, as shown in fig. 2, and therefore the filler can be conveniently stopped in the mechanical net blades. The mechanical net leaf 4 is provided with a plurality of filtering holes which can supply water to filter out the water and the pore diameter is smaller than the diameter of the filler. The aperture of the filtering holes of the mechanical net leaf is 10-30mm, and the hole spacing is 30-50mm.
The vertical partition plate 7 which can extend back and forth can be arranged in the reactor body, the rotating shaft 5 is positioned above the vertical partition plate 7 and can be fixed through a support arranged by the partition plate, the water passing hole 8 is arranged on the vertical partition plate 7, the water passing hole 8 is positioned at the bottom of the other side of the sewage inlet and outlet, and the water passing hole 8 and the sewage outlet are provided with filter screens. The sewage inlet, the water passing hole and the sewage outlet are staggered from front to back. When only one vertical partition 7 is arranged, the sewage inlet is arranged at the upper end of the front side, the sewage outlet is arranged at the upper end of the front side, and the water passing hole is arranged at the lower end of the rear side. This increases the flow path of the wastewater in the bioreactor.
An on-line dissolved oxygen meter 9 is arranged in the reactor body.
When in use, sewage enters the movable biological film sewage treatment device from the sewage inlet, the mechanical net blade is partially immersed in the sewage, and the immersion maximum depth of the mechanical net blade can reach two thirds to four fifths of the length of the mechanical net blade. The stirring speed is controlled to be 0.2-20 rpm, oxygen is continuously supplied to the reactor body, and the sewage is discharged from the sewage outlet after fully contacting and reacting with the filler.
The introduced sewage is subjected to biological adsorption, biological aerobic treatment and biological anoxic nitrogen removal treatment in the movable biological membrane sewage treatment device, and the sludge-water mixture subjected to biological oxidation and anoxic nitrogen removal treatment is discharged from the sewage to enter the next process for treatment. The dissolved oxygen of sewage in the bioreactor can be supplemented by the rotation of the mechanical net blades, and along with the rotation of the blades, part of combined suspended ball filler is reserved in the blades of the ladle type and leaves the water surface, so that on one hand: sewage in the combined suspension ball filler flows down in blades which are rotationally separated from the water surface to form drop aeration; on the other hand: after the combined suspension ball filler leaves the water surface, microorganisms attached to the filler obtain sufficient oxygen in the air; in addition, as the blades rotate, the filler slides into the sewage, causing water bloom to also reoxygenate the sewage in the bioreactor. At the same time, the rotation of the mechanical wire also promotes the movement of the combined suspended sphere packing in the bioreactor. The mechanical net blades rotate at a low speed to push the combined suspended ball filler to move in the bioreactor, so that the contact between microorganisms attached to the combined suspended ball filler and pollutants in sewage is increased.
Because the combined suspending ball filler has large specific surface area, a large amount of biological strains can be attached, and the biological strains consume organic pollutants, nitrogen, phosphorus nutrient substances and dissolved oxygen in sewage inflow water in the metabolism process, and can perform the oxidation, nitrification and denitrification of the organic matters at the same time, thereby effectively removing the pollutants in the sewage and improving the removal efficiency of the pollutants. The microorganism adheres to the surface of the filler and grows, and along with the thickening of the microorganism adhesion layer, an anoxic layer (even an anaerobic layer) and an aerobic layer are sequentially formed from inside to outside by the microorganism film, so that the anoxic denitrification biological reaction and the aerobic biological reaction can be simultaneously carried out, and the better pollutant removal effect is achieved.
The combined suspended ball filler added into the bioreactor moves continuously in the reactor under the action of rotary stirring of the mechanical net blades, and the biomembrane attached to the surface of the filler is continuously fallen and updated in collision, so that the activity of the biomembrane is maintained, and the biological treatment effect is improved.
The water quality of inlet and outlet water of the movable biological film sewage treatment device of the invention is compared with that of the traditional biological film-forming filler by contact oxidation as shown in the following table 1.
Table 1 table for domestic sewage treatment conditions
Compared with the traditional contact oxidation method, the method has the advantages that the traditional system consists of the reaction tank, the biological filler, the filler support, the aeration disc, the pipeline, the valve, the fan room, the flowmeter, the pressure gauge and the like, and the system is simpler.
The system only needs to maintain mechanical net leaves, but the existing contact oxidation needs to maintain and avoid filler collapse, blockage, short flow, fixed filler dismantling, aeration discs, fans, pipelines, valves and the like. The invention has low maintenance cost.
The process control only needs to control the rotating speed of the mechanical net leaf, but the traditional process control needs to control the start and stop of a fan, the air flow, the pressure, the valve switch, the dissolved oxygen of sewage and the like.
The invention has lower operation cost, smaller occupied area, simpler system composition, simpler operation and maintenance, better treatment effect and effluent quality and meets the requirements of national sewage discharge standards.
The present invention is not limited to the above-described embodiments, and those skilled in the art will appreciate that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a movable biomembrane sewage treatment plant, includes the reactor body, be provided with sewage import and sewage export on the reactor body, its characterized in that: the reactor is characterized in that a combined suspension ball filler is placed in the reactor body, a rotating shaft extending left and right is arranged in the reactor body, a plurality of groups of stirring blades are arranged on the rotating shaft at intervals from left to right, each group of stirring blades consists of 2-8 mechanical net blades, the mechanical net blades are of a gourd ladle-shaped structure, the 2-8 mechanical net blades are installed on the same circumference, the direction of a gourd ladle opening of each mechanical net blade is consistent with the rotating direction of the rotating shaft, and a plurality of filter holes capable of supplying water to filter out the filler diameter are formed in each mechanical net blade.
2. The mobile biofilm sewage treatment device of claim 1, wherein: the sewage inlet and the sewage outlet are respectively positioned at the left side and the right side of the reactor body.
3. The mobile biofilm sewage treatment device according to claim 1 or 2, wherein: the two ends of the rotating shaft are respectively arranged on the left side wall and the right side wall of the reactor body through bearings, and one end of the rotating shaft extends out of the reactor body and is connected with a motor with a speed reducer.
4. A mobile biofilm sewage treatment device according to claim 3, wherein: the reactor is characterized in that a vertical partition plate extending back and forth is arranged in the reactor body, a water passing hole is formed in the bottom of the other side of the water inlet and outlet on the vertical partition plate, and a filter screen is arranged on the water passing hole and the sewage outlet.
5. The mobile biofilm sewage treatment device of claim 4, wherein: the sewage inlet, the water passing hole and the sewage outlet are staggered up and down.
6. The mobile biofilm sewage treatment device of claim 5, wherein: the aperture of the filtering holes of the mechanical net leaf is 10-30mm, the hole spacing is 30-50mm, the diameter of the combined suspension ball filler is 80-150mm, and the specific surface area of the combined suspension ball filler is more than 800m 2 /m 3 。
7. The mobile biofilm sewage treatment device of claim 1, wherein: an online dissolved oxygen meter is arranged in the reactor body.
8. The mobile biofilm sewage treatment device of claim 1, wherein: each group of stirring blades consists of 3-4 mechanical net blades.
9. A sewage treatment method of movable biological membranes is characterized in that: the sewage enters the movable biomembrane sewage treatment device according to any one of claims 1 to 8 from a sewage inlet, a mechanical net leaf part is immersed in the sewage, the stirring speed is controlled to be 0.2 to 20 revolutions per minute, the low-speed rotation is controlled, oxygen is continuously supplemented into the reactor body, and the sewage is discharged from a sewage outlet after fully contacting and reacting with the filler.
10. The method for treating sewage by using an active biological membrane according to claim 9, wherein: the maximum depth of immersion of the mechanical net leaf can reach two-thirds to four-fifths of the length of the mechanical net leaf.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310135194.5A CN116199327A (en) | 2023-02-20 | 2023-02-20 | Movable biological membrane sewage treatment device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310135194.5A CN116199327A (en) | 2023-02-20 | 2023-02-20 | Movable biological membrane sewage treatment device and method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5567391A (en) * | 1978-11-13 | 1980-05-21 | Miura Eng Internatl Kk | Bod removal method |
| CN1243499A (en) * | 1997-01-24 | 2000-02-02 | 阿格罗·德里萨有限责任公司 | Device for intensive biological waste-water treatment |
| KR20050017120A (en) * | 2002-05-17 | 2005-02-22 | Halla Engineering & Ind Dev Co | Package system comprising anoxic rotary disk reactor, nitrification rotary disk reactor, inner circulation tank, sedimentation tank and chemical injector to treat sewage and wastewater using rotary disk integrally fabricated |
| JP2012187450A (en) * | 2011-03-08 | 2012-10-04 | Hiromi Ikechi | Wastewater treatment apparatus |
| WO2020135552A1 (en) * | 2018-12-29 | 2020-07-02 | 生态环境部南京环境科学研究所 | Rotating cored-type biological treatment device of low-carbon-source wastewater and usage method therefor |
| CN113880240A (en) * | 2021-11-19 | 2022-01-04 | 浙江海洋大学 | Multistage sewage treatment plant |
-
2023
- 2023-02-20 CN CN202310135194.5A patent/CN116199327A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5567391A (en) * | 1978-11-13 | 1980-05-21 | Miura Eng Internatl Kk | Bod removal method |
| CN1243499A (en) * | 1997-01-24 | 2000-02-02 | 阿格罗·德里萨有限责任公司 | Device for intensive biological waste-water treatment |
| KR20050017120A (en) * | 2002-05-17 | 2005-02-22 | Halla Engineering & Ind Dev Co | Package system comprising anoxic rotary disk reactor, nitrification rotary disk reactor, inner circulation tank, sedimentation tank and chemical injector to treat sewage and wastewater using rotary disk integrally fabricated |
| JP2012187450A (en) * | 2011-03-08 | 2012-10-04 | Hiromi Ikechi | Wastewater treatment apparatus |
| WO2020135552A1 (en) * | 2018-12-29 | 2020-07-02 | 生态环境部南京环境科学研究所 | Rotating cored-type biological treatment device of low-carbon-source wastewater and usage method therefor |
| CN113880240A (en) * | 2021-11-19 | 2022-01-04 | 浙江海洋大学 | Multistage sewage treatment plant |
Non-Patent Citations (1)
| Title |
|---|
| 周洵平: "MBR污水处理工艺及其设计探究", 资源节约与环保, vol. 2013, no. 10, 25 October 2013 (2013-10-25), pages 53 * |
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