CN114702216A - Digestion system, anaerobic digestion system for treating sludge and sewage and treatment method - Google Patents
Digestion system, anaerobic digestion system for treating sludge and sewage and treatment method Download PDFInfo
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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
- 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
- C02F3/28—Anaerobic digestion processes
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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Abstract
The invention discloses a digestion system, an anaerobic digestion system for treating sludge and sewage and a treatment method, wherein the digestion system comprises an input pipeline, an output pipeline and a digestion tank, the input pipeline is provided with pretreatment equipment, the digestion system also comprises an external circulation subsystem, and the external circulation subsystem comprises: the input end of the circulating pipeline is close to the second connecting end of the output pipeline and is arranged on the digestion tank, the height of the input end of the circulating pipeline is not higher than that of the second connecting end of the output pipeline, the output end of the circulating pipeline is close to the second connecting end of the input pipeline and is arranged on the digestion tank, and the reprocessing device is arranged on the circulating pipeline. The digestion system, the anaerobic digestion system for treating sludge and sewage and the treatment method adopt the combined action of the two branches, so that the treatment rate of the digestion system on fluid is improved, the efficiency is further improved, and the operation cost of the digestion system is reduced; meanwhile, the full reaction of the fluid can be further promoted, and the degradation rate of the fluid is improved.
Description
Technical Field
The invention relates to a digestion system, an anaerobic digestion system for treating sludge and sewage and a treatment method.
Background
In the traditional sewage treatment process, carbon source substances in sewage are mineralized by utilizing the metabolism of microorganisms, so that a large amount of aeration electric energy is consumed, and resources and energy substances in the sewage cannot be effectively recovered. For future sewage treatment plants, the resources and energy in sewage are recycled on the basis of meeting the requirement of sewage quality purification. If the energy recovery rate is improved to be more than 80%, the sewage treatment plant is changed from an energy consumption type plant to a positive energy type plant capable of producing energy.
In order to improve the energy utilization efficiency of sewage plants, reducing the power consumption of water treatment processes by process optimization is the most common method. However, the sewage treatment plant may also subject sludge generated from the sewage treatment to Anaerobic Digestion (AD) and subject the generated biogas to power generation and heat generation through Cogeneration of Heat and Power (CHP).
Conventional anaerobic digestion suffers from several major drawbacks and problems. (1) The problem of slow rates is prevalent. This is a major bottleneck that prevents its widespread use in the field of organic waste treatment. The slow rate of digestion necessitates longer hydraulic residence times, which results in excessive operating costs for anaerobic digestion. Similarly, the slow anaerobic digestion rate also causes problems of long start-up time and long recovery time after disturbance. (2) The sludge dewatering performance may deteriorate after anaerobic digestion. According to related researches, the anaerobic digestion process can obviously reduce the particle size of sludge particles, the number of the super-colloid particles is greatly increased, and the reduction of the particle size leads to the increase of the specific surface area, thereby causing the degradation of the sludge dewatering performance after digestion. (3) Insufficient sludge disinfection. The sludge is an aggregate of pollutants and organic matters in the sewage treatment process, and the bacterial virus enrichments of the sludge, so that the inactivation of the virus in the sludge plays an important role in the inactivation blocking aspect of new corona virus and the like in a sewage treatment plant. Under the background of the existing new crown blight, the traditional anaerobic digestion mode does not pay much attention to sterilization of sludge germs, and the aspect still needs to be strengthened.
Disclosure of Invention
The invention aims to overcome the defects of slow reaction rate, insufficient reaction and low digestion efficiency in the prior art and provides a digestion system, an anaerobic digestion system for treating sludge and sewage and a treatment method.
The invention solves the technical problems through the following technical scheme:
a digestion system comprises an input pipeline, an output pipeline and a digestion tank, wherein a first connecting end of the input pipeline and a second connecting end of the output pipeline are respectively installed on the digestion tank, the first connecting end is lower than the second connecting end, pretreatment equipment is arranged on the input pipeline, the digestion system further comprises an external circulation subsystem, and the external circulation subsystem comprises:
the input end of the circulating pipeline is close to the second connecting end of the output pipeline and is arranged on the digestion tank, the height of the input end of the circulating pipeline is not higher than that of the second connecting end of the output pipeline, and the output end of the circulating pipeline is close to the first connecting end of the input pipeline and is arranged on the digestion tank;
and the reprocessing device is arranged on the circulating pipeline and is positioned between the input end and the output end.
In the scheme, an external circulation subsystem is arranged on a digestion system, an input end of a circulation pipeline on the external circulation subsystem is close to a second connecting end of an output pipeline and is arranged on a digestion tank, the height of the input end of the circulation pipeline is not higher than that of the second connecting end of the output pipeline, an output end of the circulation pipeline is close to a first connecting end of the input pipeline and is arranged on the digestion tank, and meanwhile, a retreatment device is arranged on the external circulation subsystem and is used for retreating fluid flowing into the circulation pipeline. By adopting the structure, the external circulation subsystem can help and strengthen the treatment of the fluid in the digestion tank, and the combined action of the two branches can realize the combined synergistic effect, improve the treatment rate of the fluid in the digestion system, improve the treatment efficiency of the digestion tank and reduce the operation cost of the digestion system; on the other hand, the combination of the double branches can promote the full reaction of the fluid, further improve the digestion performance of the fluid in the whole digestion tank and improve the degradation rate of the fluid.
Preferably, the external circulation subsystem further comprises a power assembly disposed on the circulation line and adjacent to the input end, the power assembly being configured to draw fluid from the interior of the digester and into the circulation line.
In the scheme, the purpose of the scheme can be better realized by adopting the process arrangement form. Because the input end of the circulating pipeline is arranged on the digestion tank close to the output pipeline, and the height of the input end of the circulating pipeline is not higher than that of the output pipeline, in order to draw the fluid into the circulating pipeline, the power assembly is arranged at the position close to the output end, on one hand, the function of the digestion tank body can be fully utilized, and on the other hand, the pertinence of the external circulation subsystem to the fluid treatment in the digestion tank can be improved.
Preferably, the reprocessing device includes a first mixer having a plurality of feed ports for feeding a plurality of different medicaments.
In this scheme, set up first blender on circulating pipeline to set up a plurality of dog-house on first blender, can throw in the medicament of different grade type in each dog-house, realized the multi-purpose function of a thing of first blender, make full use of first blender can drop into multiple medicament and realize different functions simultaneously to it simultaneously. The first mixer is arranged to cooperate with the reprocessing device to digest and assist the digestion system in more fully processing the mixed liquor.
Preferably, the reprocessing device comprises a refining device, and the refining device adopts a mechanical thickener or a mechanical dehydrator.
In the scheme, the mass refining equipment is arranged on the circulating pipeline, has double functions, and is used for mechanically breaking the wall of the fluid, reducing the viscosity of the fluid, improving the treatment efficiency of the digestion tank on the fluid and improving the dehydration performance of the fluid digested by the digestion tank on the one hand; on the other hand, the device is used for dehydrating the fluid digested by the digestion tank.
Preferably, the reprocessing device further comprises a filtering device, the filtering device is located between the refining device and the input end of the circulating pipeline, and the filtering device can be adjusted according to the material of the fluid.
In the scheme, the circulating pipeline is provided with the filtering equipment which has double functions, and on one hand, the filtering equipment is used for mechanically breaking the wall of the fluid and improving the efficiency of fluid digestion reaction; on the other hand, the fluid is subjected to solid-liquid separation, the water content in the fluid is reduced, the volume of the fluid is reduced, the organic load in the digestion tank and the retention time of the fluid are synchronously increased, the fluid can be fully digested in the digestion tank, and the method has great significance for improving the digestion treatment of the fluid in the digestion tank.
Preferably, the reprocessing device comprises a first mixer and an refining device, and the first mixer and the refining device are sequentially arranged in series along the extending direction from the output end to the input end.
In this embodiment, as described above, the functions of the first mixer and the refining apparatus are different from each other, so that the first mixer and the refining apparatus are simultaneously connected in series on the circulation line, and the functions can be simultaneously realized. In addition, the first mixer is arranged before the refining equipment, the fluid flowing into the circulating pipeline is treated according to the schedule, the fluid is treated by chemical agents firstly and then is subjected to solid-liquid separation, the fluid digestion treatment can be realized more fully, and the fluid digestion treatment performance of the digestion system is greatly improved.
Preferably, the pretreatment device comprises a second mixer, and the second mixer is used for adding organic matters to the fluid flowing into the input pipeline.
In the scheme, the input pipeline is provided with the pretreatment equipment, so that the fluid flowing into the input pipeline can be pretreated firstly. Set up the second blender on the input pipeline, through throwing into organic matter to the second blender, can realize dual function: on one hand, organic matter energy is utilized, and the potential of energy recycling in the fluid is exploited to the maximum extent; on the other hand, the problem of outlet of organic matters in the fluid is solved, and the cooperative digestion treatment of the fluid and the organic matters is realized. The second mixer is provided to assist the digestive system in more fully treating the fluid in conjunction with the pretreatment apparatus for digestion.
Preferably, the pretreatment device comprises a stirring homogenizer, and the stirring homogenizer is used for degrading the fluid flowing into the input pipeline.
In the scheme, the stirring homogenizer is arranged on the input pipeline, so that the fluid input can be pretreated mechanically and intensively, the fluid is crushed and degraded, the degradation performance of the subsequent digestive system on the fluid is improved, and the improvement of the overall reaction efficiency of the digestive system is facilitated.
Preferably, the pretreatment equipment comprises a second mixer and a stirring homogenizer, and the second mixer and the stirring homogenizer are sequentially arranged on the input pipeline in series along the extending direction from the input port of the input pipeline to the digestion tank.
In this embodiment, as described above, the functions of the second mixer and the stirring homogenizer are different from each other, and therefore, the functions can be simultaneously realized by arranging the second mixer and the stirring homogenizer in series on the input line at the same time. In addition, the second mixer is arranged in front of the stirring homogenizer, the fluid flowing into the input pipeline is treated according to the schedule, the initial fluid is firstly subjected to the cooperative treatment of organic matters and then is crushed and degraded, the digestion treatment of the fluid can be more fully realized, and the digestion treatment performance of the digestion system on the fluid is greatly improved.
Preferably, a stirrer is arranged in the digestion tank and is used for stirring the fluid in the digestion tank.
In this scheme, set up the agitator in the digestion tank, can help the digestion tank to carry out abundant reaction to the fluid, improve the digestion efficiency of digestion tank, avoid fluidic accumulation in the digestion tank and react insufficient scheduling problem.
An anaerobic digestion system for treating sludge and sewage comprising a digestion system as described in any one of the preceding claims.
In the scheme, the digestion system is applied to the anaerobic digestion system for treating the sludge and the sewage, so that the digestion treatment of the anaerobic digestion system on the sludge and the sewage can be facilitated, the digestion system with the external circulation subsystem can improve the staying time of the sludge and the sewage in the anaerobic digestion tank and the load of sludge solids, the efficiency of the anaerobic digestion tank is improved, and the operation cost of the anaerobic digestion tank is reduced. Meanwhile, the sludge dewatering performance in the anaerobic digestion tank is improved, and the sludge dewatering treatment efficiency after digestion is improved.
A method of treating a fluid, the method comprising a digestion system as described in any one of the preceding claims, the method comprising the steps of:
s11, feeding a fluid to be processed into the input pipeline for pretreatment;
s12, inputting the pretreated fluid into the digestion tank;
s13, discharging a part of the fluid processed in the digestion tank from the output pipeline, and inputting a part of the fluid from the input end into the circulation pipeline of the external circulation subsystem;
s14, reprocessing the fluid entering the circulation pipeline by the reprocessing device of the external circulation subsystem;
s15, inputting the retreated fluid into the digestion tank again from the output end;
s16, returning to the step S13 until the fluid processing is stopped.
The positive progress effects of the invention are as follows: the digestion system, the anaerobic digestion system for treating sludge and sewage and the treatment method have the advantages that the external circulation subsystem is arranged to pretreat and reprocess the fluid, so that the treatment of the fluid by the digestion tank is assisted and enhanced, the combined action of the two branches is adopted, the treatment rate of the fluid by the digestion system is improved, the treatment efficiency of the digestion tank is improved, and the operation cost of the digestion system is reduced; on the other hand, the combination of double branches is adopted, so that the full reaction of the fluid is further promoted, and the degradation rate of the fluid is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a digestive system according to a preferred embodiment of the present invention.
FIG. 2 is a flow chart of a method for processing a fluid according to a preferred embodiment of the present invention.
Description of reference numerals:
digestive system 1
Input line 11 pretreatment device 111
First connecting end 113 and second mixer 1111
Stirring homogenizer 1112
Second connection end 121 digestion tank 13
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
As shown in fig. 1, a digestion system 1.
The digestion system 1 comprises an input pipeline 11, an output pipeline 12 and a digestion tank 13, wherein a first connecting end 113 of the input pipeline 11 and a second connecting end 121 of the output pipeline 12 are respectively installed on the digestion tank 13, and the first connecting end 113 is lower than the second connecting end 121, namely, the height of the first connecting end 113 on the digestion tank 13 is lower than that of the second connecting end 121 on the digestion tank 13, and a height difference exists between the first connecting end 113 and the second connecting end 121, so that the fluid can be conveniently fed in and discharged out, the operation of the whole digestion system 1 is well coordinated, and the specific installation positions of the first connecting end 113 of the input pipeline 11 and the second connecting end 121 of the output pipeline 12 are not limited. Meanwhile, a pretreatment device 111 is arranged on the input pipeline 11, the pretreatment device 111 is used for carrying out limited further pretreatment on the fluid flowing into the input pipeline 11, and the pretreated fluid is fed into the digestion tank 13 for digestion reaction treatment.
The digestion system 1 further comprises an external circulation subsystem 14, which external circulation subsystem 14 is in communication with the digestion tank 13, the main purpose of which is to perform a further digestion of the fluid flowing into the digestion tank 13.
The external circulation subsystem 14 includes, among other things, a circulation line 141 and a reprocessing device 142. The input end 1411 and the output end 1412 of the circulation pipeline are respectively installed on the digestion tank 13, and the input end 1411 is arranged close to the second connecting end 121 of the output pipeline 12, but the height of the input end 1411 on the digestion tank 13 is not higher than the height of the second connecting end 121 of the output pipeline 12 on the digestion tank 13, and the specific height of the input end can be slightly lower than the second connecting end 121 of the output pipeline 12 or the same height as the second connecting end 121 of the output pipeline 12; the output end 1412 is disposed adjacent the first connection end 113 of the input line 11, and the height of the output end 1412 above the digester 13 and the height of the first connection end 113 of the input line 11 above the digester 13 are not limited and are used for feeding fluid.
A reprocessing device 142 is mounted to the circulation line between the input 1411 and the output 1412, the reprocessing device 142 being configured to reprocess the fluid flowing into the circulation line 141.
In the application, by adopting the structure, the external circulation subsystem 14 can help and strengthen the treatment of the fluid in the digestion tank 13, and the combined action of the two branches can realize the combined synergistic effect, improve the treatment rate of the fluid in the digestion system 1, improve the treatment efficiency of the digestion tank 13 and reduce the operation cost of the digestion system 1; on the other hand, the combination of the double branches can promote the full reaction of the fluid, further improve the digestion performance of the fluid in the whole digestion tank 13 and improve the degradation rate of the fluid. The overall technical and economic values of the combined scheme are relatively high.
Specifically, the stirrer 131 is arranged in the digestion tank 13, so that the digestion tank 13 can be helped to fully react the fluid, the digestion efficiency of the digestion tank 13 is improved, and the problems of accumulation of the fluid in the digestion tank 13, insufficient reaction and the like are solved.
In this embodiment, the input pipeline 11 is installed at the lower end of the digestion tank 13, the output pipeline 12 is installed at the upper end of the digestion tank 13, and the digestion tank 13 is a cylinder with a plurality of connection surfaces on the periphery, so that the input end 1411 and the output end 1412 of the circulation pipeline 141 are convenient to install.
Specifically, the external circulation subsystem 14 includes a power assembly 143 and is disposed on a side of the circulation line 141 proximate the input 1411, the power assembly 143 for drawing fluid from the interior of the digester 13 and into the circulation line 141. By adopting the process arrangement form, the purpose of the scheme of the invention can be better realized. Since the input end 1411 of the circulation pipeline 141 is arranged on the digestion tank 13 close to the output pipeline 12, and the height of the input end 1411 is not higher than that of the output pipeline 12, in order to draw the fluid into the circulation pipeline 141, the power assembly 143 is arranged at a position close to the output end 1412, on one hand, the function of the digestion tank 13 body can be fully utilized, and on the other hand, the pertinence of the outer circulation subsystem 14 on the fluid treatment of the digestion tank 13 can be improved. The power assembly 143 is not particularly limited, and in the present embodiment, the power assembly 143 is specifically a circulation pump.
In this embodiment, the reprocessing device 142 includes a first mixer 1421, an equipment 1422, and a filter 1423, the filter 1423 is disposed between the first mixer 1421 and the equipment 1422, and the first mixer 1421, the filter 1423, and the equipment 1422 are disposed in series on the circulation line 141 in this order along the direction extending from the input 1411 to the output 1412 of the circulation line 141.
The first mixer 1421 is provided with a plurality of material inlets for inputting various types of medicaments, so that the first mixer 1421 has multiple functions, and the first mixer 1421 is fully utilized to simultaneously input various types of medicaments and realize different functions. Can strengthen the fire extinguishing performance of the digestion process to pathogenic bacteria in the fluid and block the transmission of pathogenic microorganisms including new coronavirus. Specifically, in this embodiment, the first mixer 1421 is provided with two feeding ports, and the first feeding port is used for feeding chemical cracking chemicals, such as sodium hydroxide and hydrogen peroxide; the feeding port 2 is used for feeding pathogenic bacteria inactivation medicaments, such as sodium hypochlorite, hydrogen peroxide and the like.
The refining equipment 1422 adopts a mechanical concentrator or a mechanical dehydrator, and the refining equipment 1422 has dual functions, on one hand, is used for mechanically breaking the wall of the fluid, reducing the viscosity of the fluid, improving the treatment efficiency of the digestion tank 13 on the fluid, and simultaneously improving the dehydration performance of the fluid digested by the digestion tank 13; and on the other hand, the device is used for dehydrating the fluid digested by the digestion tank 13.
The fluid is filtered by the filter 1423, the aperture of the filter 1423 is millimeter level, the range of the aperture is 0.1-1.0 mm, and the filter 1423 can be adjusted according to the material of the fluid. The filtering device 1423 has dual functions, and on one hand, is used for mechanically breaking walls of fluid and improving the efficiency of fluid digestion reaction; on the other hand, the fluid is subjected to solid-liquid separation, the water content in the fluid is reduced, the volume of the fluid is reduced, the organic load in the digestion tank 13 and the retention time of the fluid are synchronously increased, the fluid can be fully digested in the digestion tank 13, and the method has great significance for improving the digestion treatment of the fluid in the digestion tank 13.
The reprocessing device 142 includes various kinds of equipment, not limited to the three described above, and the type of equipment of the reprocessing device 142 may be adjusted or modified according to the processing conditions of the fluid and the function to be performed. Therefore, in the present embodiment, in order to sequentially perform the treatment of the chemical and the solid-liquid separation, the three are sequentially connected in series, so that the digestion treatment of the fluid can be more sufficiently performed, and the digestion treatment performance of the fluid by the digestion system 1 can be greatly improved.
In this embodiment, the pretreatment device 111 includes a second mixer 1111 and a stirring homogenizer 1112, and the second mixer 1111 and the stirring homogenizer 1112 are sequentially and serially disposed on the input pipeline 11 along the extending direction from the input port 112 of the input pipeline 11 to the digestion tank 13, that is, the stirring homogenizer 1112 is disposed between the second mixer 1111 and the first connection end 113 of the input pipeline 11, that is, the fluid sequentially passes through the second mixer 1111 and the stirring homogenizer 1112 from the input port 112 of the input pipeline 11 and then enters the digestion tank 13 from the first connection end 113 of the input pipeline 11.
The second mixer 1111 is arranged on the input pipeline 11, and by throwing organic matters including grease and scum byproducts into the second mixer 1111, the double functions can be realized by adopting the measures: on one hand, organic matter energy is utilized, and the potential of energy recycling in the fluid is exploited to the maximum extent; on the other hand, the problem of outlet of organic matters in the fluid is solved, and the cooperative digestion treatment of the fluid and the organic matters is realized.
The stirring homogenizer 1112 is disposed on the input pipeline 11, so that the fluid input can be pre-treated mechanically and intensively, the fluid can be crushed and degraded, the degradation performance of the subsequent digestive system 1 on the fluid can be improved, and the improvement of the overall reaction efficiency of the digestive system 1 can be facilitated. The stirring homogenizer 1112 may be a stirring ball mill device, a high-pressure homogenizing valve, a ball-milling stirring device, or the like, and may be provided as needed.
The pretreatment device 111 includes various devices, not limited to the above two, and the type of the pretreatment device 111 can be adjusted and changed according to the treatment condition of the fluid and the function to be realized. Therefore, in the present embodiment, in order to sequentially perform the synergistic treatment of organic substances and the action of crushing and degradation on the initial fluid, the fluid is sequentially connected in series, so that the digestion treatment of the fluid can be more sufficiently performed, and the digestion treatment performance of the fluid by the digestion system 1 can be greatly improved.
The digestion system 1 can be applied to an anaerobic digestion system 1 for treating sludge and sewage, can help the anaerobic digestion system 1 to digest the sludge and the sewage, and the digestion system 1 with the external circulation subsystem 14 can improve the staying time of the sludge and the sewage in the anaerobic digestion tank 13 and the load of sludge solids, improve the efficiency of the anaerobic digestion tank 13 and reduce the operation cost of the anaerobic digestion tank 13. Meanwhile, the sludge dewatering performance in the anaerobic digestion tank 13 is improved, and the sludge dewatering treatment efficiency after digestion is improved.
The flow rate of the fluid entering the external circulation subsystem 14 has the following relations with the volume of the digestion tank 13, the fluid retention time when the digestion tank 13 is not provided with the external circulation subsystem 14, the fluid retention time when the digestion tank 13 is provided with the external circulation subsystem 14, the water content of the fluid in the digestion tank 13 and the like:
v0: digester 13 volume, unit m 3;
t0: the fluid residence time in units d when the digester 13 is not provided with the external circulation subsystem 14;
w0: the water content, in units%, of the fluid in the digester 13;
q1: the flow rate of the external circulation subsystem 14, in m 3/d;
t1: the digester 13 is provided with an external circulation subsystem 14 for the residence time of the fluid, unit d;
w1: the water content of the fluid after passing through the external circulation subsystem 14 is unit%
In the scheme, the formula and the value range of the fluid circulation flow are adopted. The quantitative relation between the flow of the fluid external circulation subsystem 14 and the fluid retention time when the digestion tank 13 is provided with the external circulation subsystem 14 is given, and the mechanical treatment parameters are organically related to the parameters of the anaerobic digestion system 1, so that the method has very important guiding significance for the practical application of the scheme of the invention.
As shown in fig. 1-2, a method for treating a fluid, the method for treating a fluid comprising the above digestion system 1, the method comprising the steps of:
s11, the fluid feed to be treated is pretreated in the input line 11.
As a preferred embodiment, the fluid to be treated is first pretreated in the inlet line 11, with the equipment required for the pretreatment.
As a preferred embodiment, the fluid to be treated is separately treated by the second mixer 1111 and the stirring homogenizer 1112.
S12, inputting the pretreated fluid into the digestion tank 13.
In a preferred embodiment, the fluid is continuously stirred by the stirrer 131 in the digestion tank 13, so that the fluid is sufficiently digested.
S13, a part of the treated fluid in the digestion tank 13 is discharged from the output line 12, and a part of the treated fluid is input from the input 1411 to the circulation line 141 of the external circulation subsystem 14.
S14, the fluid entering the recirculation line 141 is reprocessed by the reprocessing device 142 of the extrinsic cycle subsystem 14.
As a preferred embodiment, the reprocessed fluid is reprocessed in recirculation circuit 141, with the equipment used for the reprocessing being set as desired.
As a preferred embodiment, the fluid to be reprocessed is processed through a first mixer 1421, a filtration device 1423, and a refining device 1422, respectively.
S15, the reprocessed fluid is input into the digestion tank 13 again through the output port 1412.
S16, returning to the step S13 until the fluid processing is stopped.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (12)
1. A digestion system comprises an input pipeline, an output pipeline and a digestion tank, wherein a first connecting end of the input pipeline and a second connecting end of the output pipeline are respectively installed on the digestion tank, the first connecting end is lower than the second connecting end, and pretreatment equipment is arranged on the input pipeline, and the digestion system is characterized by further comprising an external circulation subsystem which comprises:
the input end of the circulating pipeline is close to the second connecting end of the output pipeline and is arranged on the digestion tank, the height of the input end of the circulating pipeline is not higher than that of the second connecting end of the output pipeline, and the output end of the circulating pipeline is close to the first connecting end of the input pipeline and is arranged on the digestion tank;
and the reprocessing device is arranged on the circulating pipeline and is positioned between the input end and the output end.
2. The digestion system according to claim 1, wherein said external circulation subsystem further comprises a power assembly disposed on said circulation line and adjacent to said input end, said power assembly for drawing fluid from within said digester and into said circulation line.
3. The digestion system according to claim 1, wherein said reprocessing device includes a first mixer having a plurality of ports for delivering a plurality of different agents.
4. The digestion system of claim 1, wherein said reprocessing device comprises a refining apparatus that employs a mechanical thickener or a mechanical dehydrator.
5. The digestion system as set forth in claim 4, wherein said reprocessing apparatus further includes a filtering device positioned between said refining device and an input end of said circulation line, said filtering device being adjustable according to fluid material.
6. The digestion system as set forth in claim 1, wherein said reprocessing device includes a first mixer and a refining apparatus, said first mixer and said refining apparatus being arranged in series in sequence along a direction of extension of said output end to said input end.
7. The digestion system according to claim 1, wherein said pretreatment apparatus comprises a second mixer for dosing organic matter into fluid flowing into said input line.
8. The digestion system according to claim 1, wherein said pretreatment apparatus comprises a stirred homogenizer for degrading fluid flowing into said input line.
9. The digestion system according to claim 1, wherein said pretreatment apparatus comprises a second mixer and a stirring homogenizer, and said second mixer and said stirring homogenizer are sequentially disposed in series on said input line along an extension direction of an input port of said input line to said digestion tank.
10. A digestion system according to claim 1, wherein an agitator is provided within said digester for agitating fluid within said digester.
11. An anaerobic digestion system for treating sludge and sewage, characterized in that it comprises a digestion system according to any of claims 1 to 10.
12. A method of treating a fluid, the method comprising a digestion system according to any one of claims 1 to 10, the method comprising the steps of:
s11, feeding a fluid to be processed into the input pipeline for pretreatment;
s12, inputting the pretreated fluid into the digestion tank;
s13, discharging a part of the fluid treated in the digestion tank from the output pipeline, and inputting a part of the fluid treated in the digestion tank from the input end into the circulation pipeline of the external circulation subsystem;
s14, reprocessing the fluid entering the circulation pipeline by the reprocessing device of the external circulation subsystem;
s15, inputting the retreated fluid into the digestion tank again from the output end;
s16, returning to the step S13 until the fluid processing is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210258391.1A CN114702216A (en) | 2022-03-16 | 2022-03-16 | Digestion system, anaerobic digestion system for treating sludge and sewage and treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI865132B (en) * | 2023-10-26 | 2024-12-01 | 崑山科技大學 | Method and application of sludge reduction and protein recovery using homogenizer with sodium hypochlorite |
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| TWI865132B (en) * | 2023-10-26 | 2024-12-01 | 崑山科技大學 | Method and application of sludge reduction and protein recovery using homogenizer with sodium hypochlorite |
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