WO2023173951A1 - 消化系统、处理污泥的消化系统及混合液的处理方法 - Google Patents

消化系统、处理污泥的消化系统及混合液的处理方法 Download PDF

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WO2023173951A1
WO2023173951A1 PCT/CN2023/074373 CN2023074373W WO2023173951A1 WO 2023173951 A1 WO2023173951 A1 WO 2023173951A1 CN 2023074373 W CN2023074373 W CN 2023074373W WO 2023173951 A1 WO2023173951 A1 WO 2023173951A1
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Prior art keywords
pipeline
digester
mixed liquid
input
filtration
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PCT/CN2023/074373
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English (en)
French (fr)
Inventor
周友飞
胡维杰
张辰
蒋咏
郑健
曹绎名
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上海市政工程设计研究总院（集团）有限公司
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Publication of WO2023173951A1 publication Critical patent/WO2023173951A1/zh

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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
    • 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
    • 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
    • C02F11/004—Sludge detoxification
    • 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
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • 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
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • the present application relates to a digestion system, a digestion system for treating sludge and a method for treating mixed liquid.
  • anaerobic digestion Under the influence of the current COVID-19 epidemic, anaerobic digestion has also highlighted its advantages. Water is an important medium for spreading viruses. Sewage sludge is a collection of pollutants and organic matter in the sewage treatment process. It is an enrichment of bacterial viruses. Therefore, the inactivation of viruses in sludge plays a very important role in blocking the spread of the new coronavirus in sewage treatment plants. important role.
  • the anaerobic digestion process through the long-term retention of sludge for anaerobic digestion and degradation, can effectively kill pathogenic bacteria and achieve harmless treatment of sludge, thereby inactivating pathogenic bacteria to the greatest extent, which is very critical to blocking the spread of pathogenic bacteria. role.
  • the technical problem to be solved by this application is to overcome the defect of insufficient filtration in the prior art and provide a digestion system, a digestion system for treating sludge and a method for treating mixed liquid.
  • a digestion system includes an input pipeline, an output pipeline and a digester, the input pipeline and the output pipeline are respectively installed on the digester, and the input pipeline is lower than the Output pipeline, the digestive system also includes an external circulation subsystem, and the external circulation subsystem includes:
  • the circulation pipeline includes an input end, a main pipeline and an output end connected in sequence, the input end of the circulation pipeline is close to the output pipeline and is arranged on the digester, and the circulation pipeline The height of the input end is not higher than the height of the output pipeline, and the output end of the circulation pipeline is close to the input pipeline and is arranged on the digester;
  • the reprocessing device is located on the main pipeline, the reprocessing device includes multi-stage filtering equipment, and the multi-stage filtering equipment is arranged in series on the main pipeline of the circulation pipeline.
  • an external circulation subsystem is set up on the digestion system, and a reprocessing device is set up on the circulation pipeline of the external circulation subsystem.
  • a multi-stage filtration device is set up on the reprocessing device, and the multi-stage filtration device is installed along the
  • the circulation pipeline is arranged in series along the extension direction from the input end to the output end. The mixed liquid flowing into the digester is recirculated through the multi-stage filtration equipment on the external circulation subsystem and then discharged.
  • the external circulation subsystem further includes a power component, which is disposed on the main pipeline and close to the input end.
  • the power component is used to pump the mixed liquid inside the digester. and allow it to enter the circulation pipeline.
  • the purpose of the application plan can be better achieved by adopting the above process layout. Since the input end of the circulation pipeline is located in the digester near the output pipeline, and the height of the input end is not higher than the height of the output pipeline, since the mixed liquid in the upper and middle parts of the digester is a mixed liquid that has undergone relatively complete digestion reactions, its Processed by loop The meaning is relatively large, so through external mechanical treatment, its metabolic decomposition ability can be further improved, the potential of originally stored organic matter can be released, and the degradation rate of the mixed solution can be increased. Therefore, in order to pump the mixed liquid into the circulation pipeline, a power component is installed close to the output end. On the one hand, the function of the digester body can be fully utilized, and on the other hand, the external circulation subsystem can improve the efficiency of the external circulation subsystem in handling fluids in the digester. sex.
  • the input end includes a plurality of mutually independent sub-input ends
  • the circulation pipeline also includes a plurality of input branch pipes provided corresponding to a plurality of the sub-input ends, and the plurality of input branch pipes are One end is connected to a plurality of sub-input terminals one by one, and the other end is merged into a pipeline to communicate with the main pipeline.
  • multiple sub-input ports are set up on the input end of the circulation pipeline, and multiple input branch pipelines are set up corresponding to the multiple sub-input ports.
  • the flow rate of the mixed liquid into the external circulation subsystem can be increased. , which can improve the digestion rate and efficiency of the digestive system in processing the mixed liquid.
  • one end of the multiple input branch pipelines is connected to the digester through the sub-input end, and the other end is merged into one pipeline. That is, the multiple input branch pipelines are finally brought together and jointly connected to the main pipeline, so that the extracted mixed All the liquid is reprocessed to avoid missing part of the mixed liquid due to too many input branch pipes.
  • a mixing reactor is provided before the multi-stage filtration equipment.
  • the mixing reactor is provided with a plurality of feeding ports, and the feeding ports are used to put in a plurality of different chemicals.
  • a mixing reactor is provided on the main pipe of the circulation pipeline, and the mixing reactor is placed in front of the multi-stage filtration equipment.
  • the mixing reactor is provided with multiple feeding ports for inputting different chemicals.
  • the multi-purpose function of the mixing reactor is realized. By making full use of the mixing reactor, multiple chemicals can be put into it at the same time and different functions can be realized at the same time. Therefore, the mixing reactor is used for collaborative filtration equipment for digestion, helping the digestive system to process the mixed liquid more fully, so that the physical mechanical filtration and the "chemical reaction" generated in the traditional digestive system can be combined to promote the digestive reaction. effect.
  • the multi-stage filtering equipment includes a first-stage filtering equipment and a second-stage filtering equipment, and is arranged in series on the main pipeline in the extending direction from the input end to the output end.
  • filtration equipment is arranged in series and in stages on the main pipeline, so that the mixed liquid can be processed step by step and the adequacy of mixed liquid treatment can be increased.
  • the first-stage filtration equipment large particle pollutants and fibrous substances in the mixed liquid are removed, reducing the wear and damage of impurities on system equipment, reducing the risk of entanglement of the agitator, and thus improving consumption. It improves the mixing efficiency of the digester and improves the mixing degree of the mixed liquid in the digester, thus increasing the gas production rate and volume of the digester.
  • the mud and water of the mixed liquid in the external circulation subsystem of the digester can be separated, reducing the moisture content of the mixed liquid, reducing the volume of the mixed liquid, and directly increasing the residence time of the mixed liquid in the digester.
  • the extension realizes the digestion reaction time and directly improves the digestion efficiency in the digester.
  • the introduction of mechanical treatment means enables digestion to realize the coupled separation of hydraulic retention time (HRT) and sludge retention time (SRT), simultaneously increasing the organic load of the digester and the retention time of the mixed liquid, which is very important for improving the overall technical and economic value of the digestion system. significance.
  • the size of the filtration pores of the first-stage filtration device and the second-stage filtration device can be adjusted.
  • the size of the filtration pores of the first-stage filtration equipment and the second-stage filtration equipment can be adjusted according to the material of the fluid, which improves the flexibility of the first-stage filtration equipment and the second-stage filtration equipment and maintains the operation of the digestive system.
  • the stability of the digester is of great significance for improving the full digestion treatment of the mixed liquid in the digester.
  • the filtration pore size of the first-stage filtration device is larger than the filtration pore size of the second-stage filtration device.
  • the mixed liquid is first roughly filtered in the first-stage filtration equipment to separate the solid and liquid, and then the mixed liquid is fully concentrated through the second-stage filtration equipment to ensure adequate treatment of the mixed liquid. It is specific and targeted to avoid the sudden rise in filtration resistance caused by the forward extrusion of the mixed liquid to the second-stage filtration equipment, which plays a very important role in improving the durability of the digestive system.
  • the second-stage filtration equipment uses cross-flow filtration or centrifugation to filter the mixed liquid.
  • the second-stage filtration equipment uses cross-flow filtration or centrifugation to filter the mixed liquid, which can further improve the dehydration capacity of the mixed liquid, further improving the performance of the digestive system.
  • the external circulation system further includes a cracking device, and the cracking device is located between the first-stage filtering equipment and the between the second-stage filtration equipment, and the cracking device is used to break the wall of the mixed liquid.
  • a recycling device is provided after the multi-stage filtration equipment, and the recycling device is used to recover the supernatant produced after the filtration treatment of the multi-stage filtration equipment.
  • a recycling device is installed at the end of the filtration equipment to collect the supernatant obtained after being processed by the external circulation subsystem, reducing the risk of equipment and pipeline system clogging caused by solid precipitation in the digester.
  • the supernatant is regenerated and recycled simultaneously, and the tailwater filtrate is discharged to the sewage plant sewage system for full-process treatment to realize resource utilization.
  • a digestion system for treating sludge which includes the digestion system described in any one of the above.
  • applying the above-mentioned digestion system to the digestion system for sludge treatment can help the digestion system for sludge treatment digest sludge and sewage.
  • the digestion system with an external circulation subsystem can improve the digestion of sludge.
  • the time that sewage stays in the digester and the load of sludge solids improve the efficiency of the digester and reduce the operating cost of the digester.
  • the sludge dehydration performance in the digester is improved, and the efficiency of post-digestion sludge dehydration treatment is improved.
  • a method for filtration and treatment of mixed liquid which includes the digestive system as described above.
  • the specific treatment method includes the following steps:
  • step S14 Return to step S12 until the processing of the mixed liquid is stopped.
  • step S13 before inputting the mixed liquid into the multi-stage filtration equipment on the main pipeline for processing, it also includes: inputting the mixed liquid into a mixing reactor on the main pipeline for organic treatment. .
  • step S13 after the mixed liquid is input into the multi-stage filtration equipment on the main pipeline for processing, it further includes: inputting the supernatant liquid generated after the filtration treatment to a recycling device.
  • the digestion system, the digestion system for treating sludge and the treatment method of the mixed liquid are provided with an external circulation subsystem, and a reprocessing device is provided on the circulation pipeline above it.
  • a reprocessing device is provided on the circulation pipeline above it.
  • Multi-stage filtration equipment is installed on the circulation pipeline, and the multi-stage filtration equipment is extended along the circulation pipeline from the input end to the output end. Set up in series, the mixed liquid flowing into the digester is recirculated through the multi-stage filtration equipment on the external circulation subsystem and then discharged.
  • Figure 1 is a schematic diagram of the overall structure of the digestive system according to the preferred embodiment of the present application.
  • Figure 2 is a flow chart of a mixed liquid filtration treatment method according to the preferred embodiment of the present application.
  • Digestive system 1 input pipeline 2; output pipeline 3; digester 4; mixer 41; external circulation subsystem 5; circulation pipeline 51; input end 511; sub-input end 5111; input branch pipe 5112; output end 512 ; Reprocessing device 52; Filtration equipment 521; First-stage filtration equipment 5211; Second-stage filtration equipment 5212; Cracking device 5213; Power assembly 53; Mixing reactor 54; Recycling device 55.
  • the digestion system 1 includes an input pipeline 2, an output pipeline and a digester 4.
  • the input pipeline 2 and the output pipeline are installed at different heights of the digester 4 respectively.
  • the input pipeline 2 is installed at a low level. at the location of the output pipeline.
  • the specific installation locations of the input pipeline 2 and the output pipeline are not restricted, as long as they meet the digestion needs.
  • the digestion system 1 also includes an external circulation subsystem 5.
  • the main purpose of setting up the external circulation subsystem 5 is to further digest the mixed liquid flowing into the digester 4.
  • the external circulation subsystem 5 includes a circulation pipeline 51 and a reprocessing device 52 .
  • the external circulation subsystem 5 is arranged at a position between the height of the input pipeline 2 and the output pipeline.
  • the circulation pipeline 51 includes an input end 511, a main pipeline and an output end 512 that are connected in sequence.
  • the input end 511 of the circulation pipeline 51 is close to the output pipeline 3 and is arranged on the digester 4; the input end 511 of the circulation pipeline 51
  • the height is not Higher than the height of the output pipeline 3
  • the output end 512 of the circulation pipeline 51 is close to the input pipeline 2 and is set on the digester 4.
  • the mixed liquid in the lower part of the digester 4 is the original mixed liquid and has not undergone sufficient digestion reaction. After external circulation
  • the mixed liquid processed by the subsystem 5 is returned to the lower part of the digester 4 for further full digestion reaction.
  • the reprocessing device 52 is installed on the main pipeline.
  • the reprocessing device 52 includes multi-stage filtering equipment, and the multi-stage filtering equipment is arranged in series on the main pipeline of the circulation pipeline 51.
  • the mixed liquid flowing into the digester 4 is recirculated through the multi-stage filtration equipment on the external circulation subsystem 5 and then discharged. This not only enables full reaction and separation of the solid and liquid in the mixed liquid, but also reduces the cost of the digester.
  • the solid concentration in the digester 4 increases the organic load in the digester 4, and the digestion reaction rate and degree of the mixed liquid in the digester 4 can be greatly improved, which also improves the inorganic and harmless treatment of the mixed liquid.
  • the external circulation subsystem 5 also includes a power component 53.
  • the power component 53 is arranged on the main pipeline and close to the input end 511 of the circulation pipeline 51.
  • the purpose of setting the power component 53 is to suck the mixed liquid inside the digester 4 and make it It enters the circulation line 51 .
  • the power component 53 is adopted as a circulation pump, which can be set as required. Using a circulating pump can better achieve the purpose of the application plan. Since the input end 511 of the circulation pipeline 51 is located on the digester 4 close to the output pipeline 3, and the height of the input end 511 is not higher than the height of the output pipeline 3, the mixed liquid in the upper and middle parts of the digester 4 is It is of great significance for the mixed liquid with relatively complete digestion reaction to be recycled.
  • a plurality of mutually independent sub-input terminals 5111 are provided on the input terminal 511, and a plurality of input branch pipes 5112 are provided corresponding to the plurality of sub-input terminals 5111.
  • the mixed liquid can be improved to enter the external circulation subsystem 5
  • the flow rate can thereby improve the digestion rate and efficiency of the mixed liquid processed by the digestive system 1.
  • one end of the multiple input branch pipelines 5112 is connected to the digester 4 through the sub-input end 5111, and the other end is merged into one pipeline, that is, the multiple input branch pipelines 5112 are finally brought together and jointly connected to the main pipeline, which can be achieved All the mixed liquid extracted is reprocessed to avoid missing part of the mixed liquid due to too much input branch pipe 5112.
  • a mixing reactor 54 is provided before the multi-stage filtration equipment.
  • the mixing reactor 54 is provided for collaborative filtration equipment to perform digestion and helps the digestion system 1 to process the mixed liquid more fully.
  • the mixing reactor 54 is provided with multiple feeding ports for inputting different medicaments, thereby realizing the multi-purpose function of the mixing reactor 54. By making full use of the mixing reactor 54, multiple medicaments can be put into it at the same time. And realize different functions at the same time.
  • the mixing reactor 54 can be used to add sewage plant grease and scum by-products to the external circulation subsystem 5 of the digester 4, and disinfectants such as enhanced oxidants can also be added simultaneously to inactivate pathogenic bacteria in the mixed liquid.
  • disinfectants such as enhanced oxidants can also be added simultaneously to inactivate pathogenic bacteria in the mixed liquid.
  • the grease and scum by-products of the sewage plant are solid "waste" from the operation of the urban sewage plant.
  • waste By adding organic matter into the digester 4 through the mixing reactor 54, waste can be turned into treasure. On the one hand, the organic matter of the grease scum can be fully utilized.
  • the introduction of strong oxidants will further improve the properties of the mixed liquid in the digester 4, reduce the viscosity of the mixed liquid, and play a beneficial role in the transportation and dehydration of the mixed liquid after digestion.
  • the combined operation of physical mechanical filtration and the "chemical reaction" produced in the traditional digestive system 1 plays a role in promoting digestive reactions.
  • the multi-stage filtration equipment includes a first-stage filtration equipment 5211 and a second-stage filtration equipment 5212, and is arranged in series on the main pipeline in the extending direction from the input end 511 to the output end 512.
  • This structural form can process the mixed liquid step by step. Increase the adequacy of mixed liquor treatment.
  • the size of the filter pores of the first-stage filtration equipment 5211 and the second-stage filtration equipment 5212 can be adjusted according to the material of the fluid, improving the flexibility of the first-stage filtration equipment 5211 and the second-stage filtration equipment 5212 and maintaining digestion.
  • the stability of the operation of system 1 is of great significance for improving the full digestion treatment of the mixed liquid in digester 4.
  • the filtration pore size of the first-stage filtration device 5211 is larger than the filtration pore size of the second-stage filtration device 5212.
  • the mixed liquid is first roughly filtered to separate the solid and liquid, mainly to intercept fibers and large particle pollutants in the mixed liquid, and to remove large particle pollutants and fibrous substances in the mixed liquid. Reduce the wear and damage caused by impurities to the system equipment, reduce the risk of entanglement of the mixer 41, thereby improving the mixing efficiency of the digester 4 and improving The degree of mixing of the mixed liquid in the digester 4 is increased, thereby increasing the gas production rate and volume of the digester 4.
  • the filter pore size is at the millimeter level, and the separation accuracy can be adjusted according to the situation of the mixed liquid.
  • the pore size range is preferably 0.1 mm ⁇ 1.0 mm; the mixed liquid processed by the first-stage filtration equipment 5211 is then fully concentrated through the second-stage filtration equipment 5212, mainly for concentration and dehydration of the mixed liquid, which can realize the external circulation subsystem 5 of the digester 4
  • Separation of mud and water in the internal mixed liquid reduces the moisture content of the mixed liquid and reduces the volume of the mixed liquid, which directly increases the residence time of the mixed liquid in the digester 4.
  • the extension of the residence time realizes the digestion reaction time and directly increases the digestion reaction time in the digester 4.
  • Digestion efficiency its filtration pore size is at the micron level, and its separation accuracy can be adjusted according to the situation of the mixed liquid.
  • the pore size range should be 0.1 ⁇ m ⁇ 1.0 ⁇ m.
  • the introduction of mechanical treatment methods enables digestion to realize the coupled separation of hydraulic retention time HRT and sludge retention time SRT, which simultaneously increases the retention time of organic load and mixed liquid in digester 4, which improves the overall technical and economic value of digestion system 1 It is of great significance. This ensures the adequacy and pertinence of the mixed liquid treatment, avoids the sudden increase in filtration resistance caused by the forward extrusion of the mixed liquid to the second-stage filtration device 5212, and plays a very important role in improving the durability of the operation of the digestive system 1.
  • Adopting the above process layout can improve the scope of application of this application solution.
  • the pore size of the first-stage filter equipment 5211 and the second-stage filter equipment 5212 is specified, which is highly targeted.
  • the filtration pore sizes of the filtration equipment at all levels can be adjusted to cope with changes in the material of the mixed liquid under different conditions to maintain the stability of the system operation.
  • cross-flow filtration or centrifugation can be used to filter the mixed liquid, which can further improve the dehydration capacity of the mixed liquid and further improve the performance of the digestive system 1.
  • the external circulation system also includes a cracking device 5213.
  • the cracking device 5213 is located between the first-stage filtering equipment 5211 and the second-stage filtering equipment 5212, and the cracking device 5213 is used to mechanically break the wall of the mixed liquid, destroy the cell structure in the mixed liquid, activate extracellular enzymes, thereby improving the gas production efficiency and gas production of the mixed digestion.
  • the external circulation subsystem 5 includes a recycling device 55, and the recycling device 55 is arranged after the multi-stage filtration equipment, so that the supernatant liquid obtained after being processed by the external circulation subsystem 5 can be collected, reducing the size of the digester 4 The risk of equipment and pipeline system clogging caused by internal solid precipitation is eliminated, and the supernatant liquid is simultaneously regenerated and recycled to realize resource utilization.
  • multi-stage filtration equipment is used to enrich the phosphorus in the mixed liquid of digester 4 into the supernatant, which reduces the risk of equipment and pipeline system clogging caused by the accumulation and precipitation of struvite in digester 4.
  • the supernatant was phosphorus simultaneously Regeneration and recovery
  • the tail water filtrate is discharged to the sewage plant sewage system for full-process treatment to realize resource utilization.
  • the digestion system 1 with the external circulation subsystem 5 can improve the digestion of sludge. According to the time the sewage stays in the digester 4 and the load of sludge solids, the efficiency of the digester 4 is improved and the operating cost of the digester 4 is reduced. Moreover, the interception of fiber and particle pollutants in the sludge reduces the risk of entanglement of the stirrer 41 in the digester 4 . At the same time, the sludge dehydration performance in the digester 4 is improved, and the efficiency of post-digestion sludge dehydration treatment is improved.
  • the circulating flow rate of the sludge from the digestion system 1 process technology for sludge treatment into the external circulation subsystem 5 is recommended to be 50% to 150% of the sludge flow rate into the digester 4, and its value is based on the digester 4
  • the optimized volumetric load and residence time are the target values, and energy consumption factors are taken into consideration simultaneously;
  • the sludge residence time in the digester 4 and the volume load of the digester 4 have the following relationship: T1: Residence time of sludge in the digester after the external circulation subsystem, unit d; T0: Original designed sludge residence time of the digester, unit d; Q1: The flow rate of sludge entering the external circulation subsystem, unit m3/d; V0: digester volume, unit m3; Lv0: Original designed sludge volume load of the digester, unit kgVS/(m3.d); Lv1: The volume load of the digester after filtration of the external circulation subsystem, unit kgVS/(m3.d); ⁇ : Organic dry solid removal rate, unit%; x: Summary volatile solids concentration of digester mud inlet, unit kgVS/(m3); Moisture content of digested sludge in the digester, unit %; Moisture content of
  • digester 4 has a diameter of 28m, a height of 27m, an effective volume of 14,000m3, and a medium-temperature one-stage anaerobic digestion process.
  • the designed organic load of digester 4 is 1.51kg (VSS/m3/d), and the residence time is 19d.
  • the initial sludge inflow flow into digester 4 is 720m3/d, and the moisture content of the incoming sludge is 95%; based on calculations of the proportion and degradation of sludge, the moisture content of digested sludge in digester 4 is 96.3%.
  • the flow rate of the mixed liquid entering the external circulation subsystem 5 is determined. After filtration and concentration by the multi-stage filtration equipment, the mixed liquid in the digester 4 is The liquid residence time is designed to be 25d. After filtration and concentration by multi-stage filtration equipment, the moisture content of the mixed liquid is 95%. According to the formula 1 of this application, the flow rate Q1 of the mixed liquid entering the external circulation subsystem 5 is calculated to be 680m3/d.
  • Equation 2 Equation 2 between the residence time and the organic load of the digester 4 provided in this application, after filtering by the external circulation subsystem 5, the organic load of the digester 4 is increased to 2.13 (VSS/m3/d), It is improved compared with the original organic load of 1.51kg (VSS/m3/d), which proves the simultaneous improvement effect of the technical solution of this application on the residence time of digester 4 and the organic load.
  • the flow capacity of the above-mentioned first-stage filter equipment 5211 is consistent with the flow rate Q1 of the sludge entering the external circulation subsystem 5, which is 680m3/d, and the filter aperture is 0.5mm. Its separation accuracy can be adjusted according to the quality of the incoming mud, and the aperture range Design value is 0.1 ⁇ 1.0mm
  • the flow capacity of the above-mentioned second-stage filtration equipment 5212 is consistent with the flow rate Q1 of the sludge entering the external circulation subsystem 5, which is 680m3/d. It adopts the form of cross-flow turntable filtration and the filter pore size is 0.5 ⁇ m. Its separation accuracy can be determined according to the incoming sludge. Adjust according to the quality conditions, the pore size range is 0.1 ⁇ m ⁇ 1.0 ⁇ m.
  • the moisture content of the incoming mud of the second stage filtration equipment 5212 is 96.5% (sludge Moisture content after digestion), the moisture content of the mud is 95%.
  • the method for filtration and treatment of mixed liquid includes the digestive system 1 as described above.
  • the specific treatment method includes the following steps:
  • a part of the mixed liquid is sucked into the circulation pipeline 51 by the power assembly 53 on the external circulation subsystem 5 .
  • the mixed liquid before the mixed liquid is input into the multi-stage filtration equipment on the main pipeline for processing, it also includes inputting the mixed liquid into the mixing reactor 54 on the main pipeline for organic treatment.
  • the supernatant liquid generated after the filtration treatment is also input into the recycling device 55 .
  • step S14 Return to step S12 until the processing of the mixed liquid is stopped.

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  • Chemical & Material Sciences (AREA)
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Abstract

本申请公开了一种消化系统、处理污泥的消化系统及混合液的处理方法，消化系统包括多级过滤设备，多级过滤设备依次串联设置在循环管路的主管道上。该消化系统、处理污泥的消化系统及混合液的处理方法通过设置外循环子系统，并在其上的循环管路上设置再处理装置，同时，在再处理装置上设置多级过滤设备，并且将多级过滤设备沿着循环管路从输入端到输出端的延伸方向串联设置，将流入消化池内部的混合液经过外循环子系统上的多级过滤设备再循环处理后排出，不仅可以实现混合液中的固液充分反应而分离，降低消化池内固体浓度，增大消化池内的有机负荷，而且对于消化池内对于混合液的消化反应速率及程度可以实现大幅度地提高。

Description

消化系统、处理污泥的消化系统及混合液的处理方法
本申请要求申请日为2022/3/16的中国专利申请2022102779024的优先权。本申请引用上述中国专利申请的全文。
技术领域
本申请涉及一种消化系统、处理污泥的消化系统及混合液的处理方法。
背景技术
我国是目前全球碳排放第一大国，排放量占到全球的25％以上。其中，污水处理行业碳排放量占全社会总排放量的1％～2％，是不可忽视的减排领域。随着我国城镇化的推进和污水处理设施的完善，我国城镇污水处理规模超过2亿吨/天，位居世界第一。污泥是污水处理过程有机质能量的最终去除，污水处理过程能量的发掘利用必然要从污泥着手。与污泥焚烧技术类似，厌氧消化技术同步具备减量化、无害化、稳定化和资源化四大优势，尤其是在能量利用方面，其利用自然生物降解释放污泥有机质能量，实现能量的循环利用，充分体现了绿色低碳的处理理念，厌氧消化技术理应成为未来污泥处理处置技术发展的必然趋势之一。
在目前新冠疫情影响下，厌氧消化也更加凸显其优势。水是传播病毒的重要媒介，污泥是污水处理过程污染物及有机物的集合体，其细菌病毒的富集体，因而污泥中病毒的灭活在污水处理厂新冠病毒阻断传播方面起着十分重要的作用。厌氧消化过程，通过污泥长时间停留厌氧消化降解，可起到有效杀害病原菌的作用，实现污泥的无害化处理，从而最大程度灭活病原菌，对于阻断病菌传播起着十分关键的作用。
然而，传统的污泥厌氧消化技术具有过滤不充分、反应周期长、厌氧反应速率及产气效率低、沼气产量少和沼气中甲烷含量低等问题，由此带来消化池内污泥停留时间长，容积大，相应土建和设备投资也较大。
申请内容
本申请要解决的技术问题是为了克服现有技术中过滤不充分的缺陷，提供一种消化系统、处理污泥的消化系统及混合液的处理方法。
本申请是通过下述技术方案来解决上述技术问题：
一种消化系统，所述消化系统包括输入管路、输出管路和消化池，所述输入管路和所述输出管路分别安装在所述消化池上，且所述输入管路低于所述输出管路，所述消化系统还包括外循环子系统，所述外循环子系统包括：
循环管路，所述循环管路包括依次连通的输入端、主管道和输出端，所述循环管路的输入端靠近所述输出管路并设置在所述消化池上，且所述循环管路的输入端的高度不高于所述输出管路的高度，所述循环管路的输出端靠近所述输入管路并设置在所述消化池上；
再处理装置，所述再处理装置设于所述主管道上，所述再处理装置包括多级过滤设备，多级所述过滤设备依次串联设置在所述循环管路的主管道上。
在本方案中，在消化系统上设置外循环子系统，并且在外循环子系统上的循环管路上设置再处理装置，同时，在再处理装置上设置多级过滤设备，并且将多级过滤设备沿着循环管路从输入端到输出端的延伸方向串联设置，将流入消化池内部的混合液经过外循环子系统上的多级过滤设备再循环处理后排出，不仅可以实现混合液中的固液充分反应而分离，降低消化池内固体浓度，增大消化池内的有机负荷，而且对于消化池内对于混合液的消化反应速率及程度可以实现大幅度地提高，也是混合液处理无机化、无害化的提高。
较佳地，所述外循环子系统还包括动力组件，所述动力组件设于所述主管道上，且靠近所述输入端设置，所述动力组件用于抽吸所述消化池内部的混合液并使其进入所述循环管路中。
在本方案中，采用上述工艺布置形式，可较好地实现申请方案的目的。由于循环管路的输入端设置在靠近输出管路的消化池上，并且其输入端的高度不高于输出管路的高度，因消化池上部及中部混合液为经相对充分消化反应的混合液，其经过循环处理的意 义较大，所以通过外部机械处理，可进一步提高其代谢分解能力，把原本贮存的有机质潜能释放，提高混合液降解率。所以为了将混合液抽入到循环管路中，在靠近输出端的位置上设置动力组件，一方面可充分利用消化池本体的功能，另一方面可提高外循环子系统对消化池内流体处理的针对性。
较佳地，所述输入端包括多个相互独立的子输入端，所述循环管路还包括对应于多个所述子输入端设置的多个输入支管路，多个所述输入支管路的一端分别与多个所述子输入端一一连通，另一端合并为一条管路与所述主管道连通。
在本方案中，在循环管路的输入端上设置多个子输入端，并对应于多个子输入端设置多个输入支管路，采用这种结构形式，可以提高混合液进入外循环子系统的流量，进而可以提高消化系统处理混合液的消化速率及效率。同时，该多个输入支管路的一端通过子输入端和消化池连通，另一端合并为一条管路，即将多个输入支管路最后汇集在一起，共同与主管道连通，可以实现抽取进来的混合液全部进行再处理，避免因输入支管路的过多导致遗漏部分混合液。
较佳地，在多级所述过滤设备之前设有混合反应器，所述混合反应器上设有多个投料口，所述投料口用于投入多种不同的药剂。
在本方案中，在循环管路的主管道上设有混合反应器，并将混合反应器设置在多级过滤设备之前，该混合反应器上设有多个投料口，用于投入不同的药剂，实现了混合反应器一物多用的功能，充分利用混合反应器，可以同时向其投入多种药剂并同时实现不同的功能。所以设置混合反应器是用于协同过滤设备进行消化，帮助消化系统对混合液进行更充分的处理，使物理机械过滤与传统消化系统内产生的“化学反应”联合操作，起到促进消化反应的作用。
较佳地，多级所述过滤设备包括第一级过滤设备和第二级过滤设备，并从所述输入端到所述输出端的延伸方向串联设置在所述主管道上。
在本方案中，在主管道上分级串联设置过滤设备，可以按部就班的进行混合液的处理，增加混合液处理的充分性。其中，在第一级过滤设备中，去除混合液中大颗粒污染物和纤维类物质，减小杂质对系统设备的磨损破坏，降低搅拌器的缠绕风险，进而提高消 化池搅拌效率，提高消化池内混合液的混合程度，进而提高消化池产气速率和产气量。在第二级过滤设备中，可实现消化池外循环子系统内混合液的泥水分离，降低混合液的含水率，减小混合液体积，直接提高了混合液在消化池的停留时间，停留时间的延长实现了消化反应时间，直接提高消化池内的消化效率。机械处理手段的引入，使得消化实现了水力停留时间HRT和污泥停留时间SRT的耦合分离，同步提高消化池有机负荷和混合液的停留时间，对于提高消化系统整体的技术经济价值具有十分大的意义。
较佳地，所述第一级过滤设备和所述第二级过滤设备的过滤孔径的大小均可调节。
在本方案中，第一级过滤设备和第二级过滤设备过滤孔径的大小可根据流体的材质进行调节，提高第一级过滤设备和第二级过滤设备的灵活使用性，维持了消化系统运行的稳定性，对于提高消化池对混合液的充分消化处理有重大意义。
较佳地，所述第一级过滤设备的过滤孔径大于所述第二级过滤设备的过滤孔径。
在本方案中，在第一级过滤设备内对混合液先进行大概的过滤处理，将固液进行分离，再经过第二级过滤设备对混合液进行充分的浓缩处理，保证混合液处理的充分性和针对性，避免混合液对于第二级过滤设备的正向挤压引起的过滤阻力骤然上升，对于提高消化系统运行的耐久性具有十分重要的作用。
较佳地，所述第二级过滤设备采用错流过滤或离心的方式进行混合液的过滤。
在本方案中，第二级过滤设备采用错流过滤或离心的方式进行混合液的过滤可以进一步的提高混合液的脱水能力，使得消化系统性能的改善将进一步提高。
较佳地，当所述第二级过滤设备采用所述离心的方式进行混合液的过滤时，所述外循环系统还包括裂解装置，所述裂解装置位于所述第一级过滤设备与所述第二级过滤设备之间，且所述裂解装置用于对混合液进行破壁处理。
在本方案中，在第一级过滤设备和第二级过滤设备之间设有裂解装置，可以对混合液进行机械破壁处理，破坏混合液中的细胞结构，激活胞外酶，从而提高混合消化产气效率和产气量。
较佳地，在多级所述过滤设备后设有回收利用装置，所述回收利用装置用于回收多级所述过滤设备过滤处理后产生的上清液。
在本方案中，在过滤设备的最后设置回收利用装置，可以收集经过外循环子系统处理后得到的上清液，减小了消化池内固体沉淀所带来的设备和管路系统堵塞的风险，同步对上清液进行再生回收，尾水滤液排放至污水厂污水系统进行全流程处理，实现资源利用。
一种处理污泥的消化系统，所述处理污泥的消化系统包括如上任意一项所述的消化系统。
在本方案中，将上述所述消化系统应用到处理污泥的消化系统中，可以帮助处理污泥的消化系统对污泥和污水的消化处理，具有外循环子系统的消化系统可以提高污泥和污水在消化池内停留的时间和污泥固体的负荷，提高消化池的效率，降低了消化池的运行成本。同时，改善了消化池内污泥脱水性能，提高了消化后污泥脱水处理的效能。
一种混合液的过滤处理方法，所述混合液的过滤处理方法包括如上所述的消化系统，具体的处理方法包括以下步骤：
S11、将待处理的混合液从所述输入管路进料至所述消化池内；
S12、将经过所述消化池处理过的混合液的一部分进料至所述外循环子系统，另一部分从所述输出管路排出；
S13、将进入所述外循环系统的混合液通过所述循环管路的输入端输入所述主管道上的多级所述过滤设备进行过滤处理，将过滤处理后产生的浓缩物通过所述输出端输入到所述消化池内；
S14、返回步骤S12，直至停止混合液的处理。
较佳地，在步骤S13中，在将混合液输入所述主管道上的多级所述过滤设备进行处理之前，还包括：将所述混合液输入所述主管道上的混合反应器中进行有机处理。
较佳地，在步骤S13中，在将混合液输入所述主管道上的多级所述过滤设备进行处理之后，还包括：将过滤处理后产生的上清液输入至回收利用装置。
本申请的积极进步效果在于：该消化系统、处理污泥的消化系统及混合液的处理方法通过设置外循环子系统，并在其上的循环管路上设置再处理装置，同时，在再处理装置上设置多级过滤设备，并且将多级过滤设备沿着循环管路从输入端到输出端的延伸方 向串联设置，将流入消化池内部的混合液经过外循环子系统上的多级过滤设备再循环处理后排出，不仅可以实现混合液中的固液充分反应而分离，降低消化池内固体浓度，增大消化池内的有机负荷，而且对于消化池内对于混合液的消化反应速率及程度可以实现大幅度地提高，也是混合液处理无机化、无害化的提高。
附图说明
图1为本申请较佳实施方式的消化系统的整体结构示意图。
图2为本申请较佳实施方式混合液的过滤处理方法的流程框架图。
附图标记说明：
消化系统1；输入管路2；输出管路3；消化池4；搅拌器41；外循环子系统5；循
环管路51；输入端511；子输入端5111；输入支管路5112；输出端512；再处理装置52；过滤设备521；第一级过滤设备5211；第二级过滤设备5212；裂解装置5213；动力组件53；混合反应器54；回收利用装置55。
具体实施方式
下面通过实施例的方式进一步说明本申请，但并不因此将本申请限制在所述的实施例范围之中。
如图1所示，为本申请较佳实施方式的消化系统1。
消化系统1包括输入管路2、输出管路和消化池4，将输入管路2和输出管路分别安装在消化池4的不同高度上，在本申请中，将输入管路2安装在低于输出管路的位置上。输入管路2和输出管路的具体安装位置不受限制，满足消化需求即可。
消化系统1还包括外循环子系统5，设置外循环子系统5的主要目的是用于对流入消化池4内的混合液进行进一步的消化作用。外循环子系统5包括循环管路51和再处理装置52。外循环子系统5设置在输入管路2和输出管路所在高度的之间位置上。
其中，循环管路51包括依次连通的输入端511、主管道和输出端512，循环管路51的输入端511靠近输出管路3并设置在消化池4上；循环管路51的输入端511的高度不 高于输出管路3的高度，循环管路51的输出端512靠近输入管路2并设置在消化池4上，消化池4下部混合液为原始混合液，未进行充分消化反应，经过外循环子系统5处理后的混合液返回至消化池4的下部，可进一步充分消化反应。通过上述布置方案，可充分实现本申请方案的目的。
其中，再处理装置52安装在主管道上，再处理装置52包括多级过滤设备，且多级过滤设备依次串联设置在循环管路51的主管道上。采用这种结构形式，将流入消化池4内部的混合液经过外循环子系统5上的多级过滤设备再循环处理后排出，不仅可以实现混合液中的固液充分反应而分离，降低消化池4内固体浓度，增大消化池4内的有机负荷，而且对于消化池4内对于混合液的消化反应速率及程度可以实现大幅度地提高，也是混合液处理无机化、无害化的提高。
外循环子系统5还包括动力组件53，动力组件53设置在主管道上，且靠近循环管路51的输入端511，设置动力组件53的目的是用于抽吸消化池4内部的混合液并使其进入循环管路51中。在本实施方式中，动力组件53采取为循环泵，具体可按需设置。采取循环泵，可较好地实现申请方案的目的。由于循环管路51的输入端511设置在靠近输出管路3的消化池4上，并且其输入端511的高度不高于输出管路3的高度，因消化池4上部及中部混合液为经相对充分消化反应的混合液，其经过循环处理的意义较大，所以通过外部机械处理，可进一步提高其代谢分解能力，把原本蕴藏的有机质潜能释放，提高混合液降解率。所以为了将混合液抽入到循环管路51中，在靠近输出端512的位置上设置动力组件53，一方面可充分利用消化池4本体的功能，另一方面可提高外循环子系统5对消化池4内流体处理的针对性。
其中，在输入端511上设置多个相互独立的子输入端5111，并对应于多个子输入端5111设置多个输入支管路5112，采用这种结构形式，可以提高混合液进入外循环子系统5的流量，进而可以提高消化系统1处理混合液的消化速率及效率。同时，该多个输入支管路5112的一端通过子输入端5111和消化池4连通，另一端合并为一条管路，即将多个输入支管路5112最后汇集在一起，共同与主管道连通，可以实现抽取进来的混合液全部进行再处理，避免因输入支管路5112的过多导致遗漏部分混合液。
在多级过滤设备之前设有混合反应器54，设置混合反应器54是用于协同过滤设备进行消化，帮助消化系统1对混合液进行更充分的处理。对应的，在混合反应器54上设有多个投料口，用于投入不同的药剂，实现了混合反应器54一物多用的功能，充分利用混合反应器54，可以同时向其投入多种药剂并同时实现不同的功能。
在本实施方式中，通过混合反应器54可向消化池4外循环子系统5中投加污水厂油脂、浮渣副产物，也可同步投加强氧化剂等消毒药剂，灭活混合液中病原菌。采用该工艺布置形式，可实现本申请方案协同消化及灭活病毒的功能。污水厂油脂、浮渣副产物是城市污水厂运行的固体“废弃物”，通过混合反应器54投加有机质进入消化池4内，可实现变废为宝，一方面充分利用油脂浮渣的有机质能源；另一方面解决了混合液中油脂浮渣副产物的出路问题，是混合液处理节能减碳的优良实践，具有十分重要的推广应用价值。通过混合反应器54向消化池4的外循环子系统5中投加强氧化剂等消毒药剂，如次氯酸钠、双氧水等，可实现强化灭活消化池4病原菌的目的，对于阻断混合液中包括新冠病毒在内的病原菌的传播具有十分重要的意义。同时，强氧化剂的引入经将进一步改善消化池4内混合液性质，降低混合液黏性，对于消化后混合液的输送及脱水均起到有利的作用。使得物理机械过滤与传统消化系统1内产生的“化学反应”联合操作，起到促进消化反应的作用
多级过滤设备包括第一级过滤设备5211和第二级过滤设备5212，并从输入端511到输出端512的延伸方向串联设置在主管道上，这种结构形式可以按部就班的进行混合液的处理，增加混合液处理的充分性。
其中，第一级过滤设备5211和第二级过滤设备5212的过滤孔径的大小可根据流体的材质进行调节，提高第一级过滤设备5211和第二级过滤设备5212的灵活使用性，维持了消化系统1运行的稳定性，对于提高消化池4对混合液的充分消化处理有重大意义。
具体地，第一级过滤设备5211的过滤孔径大于第二级过滤设备5212的过滤孔径。在第一级过滤设备5211内对混合液先进行大概的过滤处理，将固液进行分离，主要进行混合液中纤维、大颗粒污染物的截留，去除混合液中大颗粒污染物和纤维物质，减小杂质对系统设备的磨损破坏，降低搅拌器41的缠绕风险，进而提高消化池4搅拌效率，提 高消化池4内混合液的混合程度，进而提高消化池4产气速率和产气量，其过滤孔径为毫米级别，其分离精度可根据混合液的情况进行调节，孔径范围宜为0.1mm～1.0mm；经过第一级过滤设备5211处理后的混合液，再经过第二级过滤设备5212对混合液进行充分的浓缩处理，主要进行混合液的浓缩脱水，可实现消化池4外循环子系统5内混合液的泥水分离，降低混合液的含水率，减小混合液体积，直接提高了混合液在消化池4的停留时间，停留时间的延长实现了消化反应时间，直接提高消化池4内的消化效率，其过滤孔径为微米级别，其分离精度可根据混合液的情况进行调节，孔径范围宜为0.1μm～1.0μm。同时，机械处理手段的引入，使得消化实现了水力停留时间HRT和污泥停留时间SRT的耦合分离，同步提高消化池4有机负荷和混合液的停留时间，对于提高消化系统1整体的技术经济价值具有十分大的意义。这样保证混合液处理的充分性和针对性，避免混合液对于第二级过滤设备5212的正向挤压引起的过滤阻力骤然上升，对于提高消化系统1运行的耐久性具有十分重要的作用。采用上述工艺布置形式，可提高本申请方案的适用范围。结合目前混合液的材质，规定了第一级过滤设备5211和第二级过滤设备5212过滤的孔径大小，针对性强。同时，明确各级过滤设备的过滤孔径可调节，可应对不同条件下混合液材质的变化，以维持系统运行的稳定性。
在第二级过滤设备5212中，可采用错流过滤或离心的方式进行混合液的过滤，这样可以进一步的提高混合液的脱水能力，对于消化系统1性能的改善将进一步提高。
当第二级过滤设备5212采用离心的方式进行混合液的过滤时，外循环系统还包括裂解装置5213，裂解装置5213位于第一级过滤设备5211与第二级过滤设备5212之间，且裂解装置5213用于对混合液进行机械破壁处理，破坏混合液中的细胞结构，激活胞外酶，从而提高混合消化产气效率和产气量。
最后，外循环子系统5包括回收利用装置55，并将回收利用装置55设置在多级过滤设备之后，这样可以收集经过外循环子系统5处理后得到的上清液，减小了消化池4内固体沉淀所带来的设备和管路系统堵塞的风险，同步对上清液进行再生回收，实现资源利用。在本方案中，通过多级过滤设备使消化池4混合液的磷富集到上清液中，减小了消化池4内鸟粪石的积累沉淀所带来的设备和管路系统堵塞风险，同步对上清液进行磷 的再生回收，尾水滤液排放至污水厂污水系统进行全流程处理，实现资源利用。
将上述所述消化系统1应用到处理污泥的消化系统1中，可以帮助处理污泥的消化系统1对污泥和污水的消化处理，具有外循环子系统5的消化系统1可以提高污泥和污水在消化池4内停留的时间和污泥固体的负荷，提高消化池4的效率，降低了消化池4的运行成本。而且，对污泥中纤维、颗粒污染物的截留，降低了消化池4内搅拌器41缠绕的风险。同时，改善了消化池4内污泥脱水性能，提高了消化后污泥脱水处理的效能。
本申请方案中，处理污泥的消化系统1工艺技术的污泥进入外循环子系统5的循环流量的取值建议为50％～150％消化池4进泥流量，其取值以消化池4优化后的容积负荷及停留时间为目标值，同步考虑能耗因素进行；
进一步地，处理污泥的消化系统1经外循环子系统5过滤浓缩工艺后，消化池4内污泥停留时间与消化池4容积负荷等存在如下关系：


T1：外循环子系统后污泥在消化池停留时间，单位d；
T0：消化池原设计污泥停留时间，单位d；
Q1：污泥进入外循环子系统的流量，单位m3/d；
V0：消化池体积，单位m3；
Lv0：消化池原设计污泥容积负荷，单位kgVS/(m3.d)；
Lv1：外循环子系统过滤后消化池容积负荷，单位kgVS/(m3.d)；
δ：有机干固去除率，单位％；
x：消化池进泥汇总挥发性固体浓度，单位kgVS/(m3)；
消化池内消化后污泥含水率，单位％；
外循环子系统过滤处理后污泥含水率，单位％；
本方案中，采用上述污泥循环流量取值范围及循环流量与消化池4核心参数的关系 等式。定量化给出了污泥外循环流量与消化池4污泥停留时间、消化池4容积负荷关系式，证明了污泥经过外循环子系统5过滤浓缩后停留时间与容积负荷的同时提高，采用本申请方案后，通过污泥外循环子系统5过滤处理，将同步提高消化池4停留时间和有机容积负荷，实现了本申请方案的原始目的，即同步提高水力停留时间HRT和污泥停留时间SRT，这对于消化系统1技术经济性能的整体提高有着十分重要的意义。
在本方案中，消化池4直径为28m，高度27m，有效容积为14000m3，采用中温一级厌氧消化工艺。消化池4设计有机负荷1.51kg(VSS/m3/d)，停留时间19d。消化池4内初始污泥进泥流量为720m3/d，进泥含水率95％；根据污泥中比例及降解计算，消化池4内消化后污泥含水率为96.3％。
以经过外循环子系统5处理后消化池4内混合液停留时间为目标值，进行混合液进入外循环子系统5流量的取值，经过多级过滤设备的过滤浓缩后，消化池4内混合液停留时间设计为25d，经过多级过滤设备的过滤浓缩后混合液含水率为95％，根据本申请公式1，计算得混合液进入外循环子系统5流量Q1为680m3/d。

按照本申请提供的停留时间与消化池4有机负荷之间的关系等式(式2)，经外循环子系统5过滤处理后，消化池4有机负荷提高为2.13(VSS/m3/d)，比原始有机负荷1.51kg(VSS/m3/d)有所提高，证明了本申请技术方案在消化池4停留时间和有机负荷方面的同步提高作用。
上述第一级过滤设备5211的过流能力与污泥进入外循环子系统5的流量Q1一致，为680m3/d，过滤孔径0.5mm，其分离精度可根据进泥泥质情况进行调节，孔径范围设计值为0.1～1.0mm
上述第二级过滤设备5212的过流能力与污泥进入外循环子系统5的流量Q1一致，为680m3/d，采用错流转盘过滤形式，过滤孔径0.5μm，其分离精度可根据进泥泥质情况进行调节，孔径范围为0.1μm～1.0μm。第二级过滤设备5212进泥含水率96.5％(污泥 消化后含水率)，出泥含水为95％。
如图1和2所示，一种混合液的过滤处理方法，混合液的过滤处理方法包括如上所述的消化系统1，具体的处理方法包括以下步骤：
S11、将待处理的混合液从所述输入管路2进料至所述消化池4内。
S12、将经过所述消化池4处理过的混合液的一部分进料至所述外循环子系统5，另一部分从所述输出管路3排出。
作为较佳的实施方式，一部分混合液被外循环子系统5上的动力组件53抽吸进入循环管路51上。
S13、将进入所述外循环系统的混合液通过所述循环管路51的输入端511输入所述主管道上的多级所述过滤设备进行过滤处理，将过滤处理后产生的浓缩物通过所述输出端512输入到所述消化池4内。
作为较佳的实施方式，在将混合液输入主管道上的多级过滤设备进行处理之前，还包括将混合液输入主管道上的混合反应器54中进行有机处理。
作为较佳的实施方式，在将混合液输入主管道上的多级过滤设备进行处理之后，还包括将过滤处理后产生的上清液输入至回收利用装置55。
S14、返回步骤S12，直至停止混合液的处理。
虽然以上描述了本申请的具体实施方式，但是本领域的技术人员应当理解，这仅是举例说明，本申请的保护范围是由所附权利要求书限定的。本领域的技术人员在不背离本申请的原理和实质的前提下，可以对这些实施方式做出多种变更或修改，但这些变更和修改均落入本申请的保护范围。

Claims (14)

  1. 一种消化系统，所述消化系统包括输入管路、输出管路和消化池，所述输入管路和所述输出管路分别安装在所述消化池上，且所述输入管路低于所述输出管路，其特征在于，所述消化系统还包括外循环子系统，所述外循环子系统包括：
    循环管路，所述循环管路包括依次连通的输入端、主管道和输出端，所述循环管路的输入端靠近所述输出管路并设置在所述消化池上，且所述循环管路的输入端的高度不高于所述输出管路的高度，所述循环管路的输出端靠近所述输入管路并设置在所述消化池上；
    再处理装置，所述再处理装置设于所述主管道上，所述再处理装置包括多级过滤设备，多级所述过滤设备依次串联设置在所述循环管路的主管道上。
  2. 如权利要求1所述的消化系统，其特征在于，所述外循环子系统还包括动力组件，所述动力组件设于所述主管道上，且靠近所述输入端设置，所述动力组件用于抽吸所述消化池内部的混合液并使其进入所述循环管路中。
  3. 如权利要求1或2所述的消化系统，其特征在于，所述输入端包括多个相互独立的子输入端，所述循环管路还包括对应于多个所述子输入端设置的多个输入支管路，多个所述输入支管路的一端分别与多个所述子输入端一一连通，另一端合并为一条管路与所述主管道连通。
  4. 如权利要求1-3任意一项所述的消化系统，其特征在于，在多级所述过滤设备之前设有混合反应器，所述混合反应器上设有多个投料口，所述投料口用于投入多种不同的药剂。
  5. 如权利要求1-4任意一项所述的消化系统，其特征在于，多级所述过滤设备包括第一级过滤设备和第二级过滤设备，并从所述输入端到所述输出端的延伸方向串联设置在所述主管道上。
  6. 如权利要求5所述的消化系统，其特征在于，所述第一级过滤设备和所述第二级过滤设备的过滤孔径的大小均可调节。
  7. 如权利要求5或6所述的消化系统，其特征在于，所述第一级过滤设备的过滤孔径大于所述第二级过滤设备的过滤孔径。
  8. 如权利要求5-7任意一项所述的消化系统，其特征在于，所述第二级过滤设备采用错流过滤或离心的方式进行混合液的过滤。
  9. 如权利要求8所述的消化系统，其特征在于，当所述第二级过滤设备采用所述离心的方式进行混合液的过滤时，所述外循环系统还包括裂解装置，所述裂解装置位于所述第一级过滤设备与所述第二级过滤设备之间，且所述裂解装置用于对混合液进行破壁处理。
  10. 如权利要求1-9任意一项所述的消化系统，其特征在于，在多级所述过滤设备后设有回收利用装置，所述回收利用装置用于回收多级所述过滤设备过滤处理后产生的上清液。
  11. 一种处理污泥的消化系统，其特征在于，所述处理污泥的消化系统包括权利要求1-10任意一项所述的消化系统。
  12. 一种混合液的过滤处理方法，其特征在于，所述混合液的过滤处理方法包括权利要求1-10任意一项所述的消化系统，具体的处理方法包括以下步骤：
    S11、将待处理的混合液从所述输入管路进料至所述消化池内；
    S12、将经过所述消化池处理过的混合液的一部分进料至所述外循环子系统，另一部分从所述输出管路排出；
    S13、将进入所述外循环系统的混合液通过所述循环管路的输入端输入所述主管道上的多级所述过滤设备进行过滤处理，将过滤处理后产生的浓缩物通过所述输出端输入到所述消化池内；
    S14、返回步骤S12，直至停止混合液的处理。
  13. 如权利要求12所述的混合液的过滤处理方法，其特征在于，在步骤S13中，在将混合液输入所述主管道上的多级所述过滤设备进行处理之前，还包括：将所述混合液输入所述主管道上的混合反应器中进行有机处理。
  14. 如权利要求12或13所述的混合液的过滤处理方法，其特征在于，在步骤S13中， 在将混合液输入所述主管道上的多级所述过滤设备进行处理之后，还包括：将过滤处理后产生的上清液输入至回收利用装置。
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