CN114853258A - Large-scale farm fecal sewage treatment system and working method thereof - Google Patents
Large-scale farm fecal sewage treatment system and working method thereof Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000002550 fecal effect Effects 0.000 title claims abstract description 12
- 239000010802 sludge Substances 0.000 claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 210000003608 fece Anatomy 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 12
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- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 238000003973 irrigation Methods 0.000 claims abstract description 4
- 230000002262 irrigation Effects 0.000 claims abstract description 4
- 238000004062 sedimentation Methods 0.000 claims description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 32
- 239000001301 oxygen Substances 0.000 claims description 32
- 229910052760 oxygen Inorganic materials 0.000 claims description 32
- 238000004880 explosion Methods 0.000 claims description 28
- 239000000701 coagulant Substances 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 13
- 230000000813 microbial effect Effects 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 13
- 230000015556 catabolic process Effects 0.000 claims description 12
- 238000006731 degradation reaction Methods 0.000 claims description 12
- 239000008394 flocculating agent Substances 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 8
- 238000000855 fermentation Methods 0.000 claims description 6
- 230000004151 fermentation Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims description 3
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- 238000012423 maintenance Methods 0.000 abstract 1
- 239000011265 semifinished product Substances 0.000 abstract 1
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- 238000004140 cleaning Methods 0.000 description 7
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- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000010871 livestock manure Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
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- 241000894006 Bacteria Species 0.000 description 2
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- 239000003344 environmental pollutant Substances 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
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- 210000002700 urine Anatomy 0.000 description 2
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
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Images
Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
-
- 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
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a process flow of a large-scale farm fecal sewage and sewage treatment system. The using method is to separate the excrement from the sewage in the mixture of the excrement, the sludge and the sewage and then carry out advanced treatment on the sewage. The sewage is treated by separation, precipitation, filtration, disinfection and the like and then is used as the farmland irrigation standby water or is directly discharged. The sludge cake containing 30% of water is prepared by extruding the feces and the sludge, and is used as a semi-finished product of the organic fertilizer, so that the organic fertilizer has economic value, the income of a farm is increased, and the problems of large sludge amount, unsmooth operation, difficult maintenance and water outlet index repetition and instability existing in other treatment processes are effectively solved.
Description
The technical field is as follows:
the invention relates to a pollutant treatment method, in particular to a treatment process of feces and sewage in a farm.
Background
At present, when people visit and investigate the current environmental situation of large-scale farms in a plurality of large-scale breeding counties in China, the method and equipment for treating excrement and sewage in most farms are found to be incomplete and unfit.
Partial excrement of the farm is directly stacked outside the farm or directly discharged to the outside, so that pollutants such as excrement, urine and the like directly enter soil, ground surface water or underground water.
In order to solve the problems, most of the farms begin to build biogas and biochemical ponds to treat the excrement and urine, and the excrement and sewage entering the biogas digester directly enter the biogas digester without being separated. In daily use, a large amount of residues are left in the methane tank, the methane tank is accumulated day by day, and the methane tank has blockage conditions such as little or no gas production and the like. The cleaning of the methane tank is time-consuming, labor-consuming and unsafe, and accidents of methane tank cleaning occur in China.
There are four current methods of manure disposal in farms: the four dung cleaning methods of dry dung cleaning, water dung flushing, water dung soaking and scraper dung cleaning are adopted. The residual excrement can not be thoroughly cleaned in the collection and cleaning process, and the residual excrement can enter the methane tank along with the manual cleaning process, so that the methane tank is saturated along with the time.
At present, sewage treatment systems are built in large-scale farms, and the systems adopt open-air open cement ponds which are used for treating domestic sewage. The dry-wet separator extrudes excrement, and the extruded sewage flows into a sewage treatment system. Because the sewage treatment system of the large-scale farm adopts the treatment process (generally called industrial treatment) of domestic sewage, the mud content of the domestic sewage is only 3% -5%, and the mud content of the sewage of the large-scale farm is 20% of dry clear excrement, 10% of water flush excrement, 40% of water bubble excrement and 30% of scraper clear excrement, if a traditional dry-wet separator is adopted to separate pig excrement, coarse fibers are extruded after extrusion, and the sludge enters the sewage treatment system along with water, so that the sludge content in the system is too large, a sludge discharge system cannot follow up, the whole process is unsmooth in operation, the color of discharged water is heavy, and the indexes exceed the standards. The open treatment method has low temperature in winter and low microbial activity, and the sewage treatment can not reach the discharge standard.
Disclosure of Invention
In order to solve the problems, the invention discloses a process flow for treating excrement and sewage.
The technical scheme of the invention is as follows:
the utility model provides a dirty sewage treatment system of scale plant excrement, includes: the excrement collecting tank is connected with the excrement separator, an outlet of the excrement separator is connected with the first sedimentation tank, the first sedimentation tank is connected with the second sedimentation tank and the sludge tank respectively, the second sedimentation tank is connected with the explosion oxygen tank and the sludge tank respectively, the sludge tank is connected with the sludge filter pressing mechanism, and the sludge filter pressing mechanism is connected with the explosion oxygen tank.
Further, the sewage treatment device comprises a sewage heater, a primary separator, a sewage adjusting bin, a microbial degradation bin, an anaerobic bin, a secondary separator, a purification and disinfection bin and a filter which are connected in sequence, wherein the oxygen explosion pool is connected with the sewage heater.
Furthermore, a flocculating agent and/or a coagulant are added in the manure-sewage separator, the primary separator and the secondary separator.
Further, still include the backward flow pond, primary separator and secondary separator bottom all are equipped with controllable valve, and primary separator and secondary separator pass through controllable valve and are connected with the backward flow pond, the backward flow pond is connected with sludge impoundment and explosion oxygen pond respectively.
A working method of the fecal sewage treatment system for the large-scale farm comprises the following steps:
s1, enabling the sewage in the farm to intensively enter a sewage collecting tank;
s2, enabling dirt in the dirt collecting tank to enter a dirt separator to separate dirt sludge and sewage, wherein the dirt separator comprises a filter screen, a flocculating agent and a coagulant adding mechanism.
S3, the sewage containing a small amount of sludge and separated from the manure separator enters a first sedimentation tank, the sewage added with a flocculating agent and a coagulant is precipitated after entering the first sedimentation tank, the precipitated liquid sewage enters a second sedimentation tank for secondary sedimentation, the liquid sludge in the first sedimentation tank and the second sedimentation tank enters a sludge tank, and the sewage in the second sedimentation tank enters an oxygen explosion tank;
s4, collecting sludge in the sludge pool, performing compression filtration treatment by using a sludge filter pressing mechanism, pressing the sludge into a mud cake, then sending the mud cake and the sludge separated by the sludge-sludge separator to a sludge accumulation fermentation bin for natural fermentation, and making the sewage extruded from the sludge in the sludge filter pressing process flow to an oxygen explosion pool.
Preferably, the sewage in the S4 oxygen explosion pond can also directly enter the oxidation pond to be used as farmland irrigation spare water.
Preferably, sewage in the S3 medium oxygen burst tank enters a primary separator through a heater for sewage separation, a flocculating agent and/or a coagulant are added into the primary separator, sludge generated by the primary separator is sent to a return tank through a controllable valve at the bottom, generated sewage enters a sewage adjusting bin, sewage discharged from the sewage adjusting bin enters a microbial degradation bin, sewage discharged from the microbial degradation bin enters an anaerobic bin, sewage discharged from the anaerobic bin enters a secondary separator, a flocculating agent and/or a coagulant are added into the secondary separator, sludge generated by the secondary separator is sent to the return tank through a controllable valve at the bottom, sewage generated by the secondary separator is sent to a purification and disinfection bin for disinfection treatment, sewage discharged from the purification and disinfection bin enters a filter for filtration, and is discharged after being filtered and entering an artificial wetland.
Preferably, the reflux pool collects sludge and partial sewage condensed and precipitated by the primary separator or the secondary separator, the sludge is sent into the sludge pool after being precipitated, and the sewage enters the oxygen explosion pool for treatment.
The invention has the advantages that: various excreta of the farm are treated in a grading way, the problem of overlarge sludge amount is solved, and finally the treated excreta form solid culture materials which meet the agricultural water or discharge water of national standard. The invention mostly uses equipment to treat the excrement and sewage, is convenient to maintain and repair, and saves the environment-friendly construction investment and the land use area.
Description of the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
firstly, a feces and sewage collecting tank; secondly, separating manure from sewage; thirdly, a first sedimentation tank; fourthly, a second sedimentation tank; fifthly, exploding an oxygen pond; sixthly, a sludge tank; seventhly, a sludge filter-pressing mechanism; eighthly, a sewage heater; ninthly, a primary separator; a charge regulation bin; ⑪, a microbial degradation bin; ⑫, an anaerobic bin; ⑬, secondary separator; ⑭, purifying and disinfecting; ⑮, a filter; ⑯, artificial wetland; ⑰ and a reflux pool.
The specific implementation mode is as follows:
the invention is further explained by the following combined with the attached drawings of the specification
Example 1
As shown in fig. 1: in a small-scale farm, sewage is not treated and only sludge and excrement are treated in consideration of economic cost and scale, so that only a excrement collecting tank, an excrement and excrement separator, a first sedimentation tank, a second sedimentation tank, an oxygen explosion tank, a sludge tank and a sludge filter press are needed. The process mainly aims at the concentrated discharged excrement and sewage in the farm, and the discharged excrement and sewage directly enter an excrement and sewage collecting tank I. The excrement collecting tank is connected with an excrement-sewage separating machine, the excrement-sewage separating machine extracts a mixture of excrement and sewage discharged from a farm from the excrement-sewage collecting tank through a pump, an adding mechanism is arranged in the excrement-sewage separating machine and automatically adds a flocculating agent and a coagulant into the separated sewage to enable small molecules suspended in the sewage to be coagulated into macromolecules, a water outlet of the excrement-sewage separating machine is connected with a first sedimentation tank, the first sedimentation tank is connected with a second sedimentation tank, most of sludge in a solid state is flocculated under the action of the flocculating agent and the coagulant to be precipitated in the first sedimentation tank, the precipitated sewage enters a second sedimentation tank for continuous sedimentation, sludge pumps are arranged in the first sedimentation tank and the second sedimentation tank, the precipitated sludge enters a sludge tank, and the second sedimentation tank is connected with an oxygen explosion tank, the settled sewage directly enters an oxygen explosion tank. The fifth oxygen-explosion pool is provided with an oxygen-explosion device, the dissolution speed of oxygen in the fifth oxygen-explosion pool is accelerated under the action of the oxygen-explosion device, so that the sewage is fully oxidized, sludge and organic matters dissolved in water in the sewage expand to volatilize in the form of ammonia gas, and the water treated by the fifth oxygen-explosion pool is sent to an oxidation pond to be used as spare water for farmland irrigation. The sludge tank is connected with a sludge filter-pressing mechanism which extrudes sludge to form a mud cake (semi-finished organic fertilizer) with 30 percent of water, and then a feces-sludge separator is added to separate the feces and sludge and send the separated feces and sludge to a feces accumulation fermentation shed for natural fermentation. And (4) the sewage which flows out through the sludge filter-pressing mechanism and the filter-pressing enters an oxygen explosion tank for oxygen explosion treatment.
The following table is a comparison table of indexes of water before and after the feces separation in example 1
In the table, pH is a pH value indicating a pH value, COD represents a chemical oxygen demand, P represents phosphorus, and SS represents suspended matter.
Example 2
In areas where sewage needs to be deeply treated, the sewage needs to reach the national discharge standard.
As shown in fig. 1, on the basis of embodiment 1, the oxygen explosion tank comprises a sewage heater (r), a primary separator (ninc), a sewage regulation bin (r), a microbial degradation bin (⑪), an anaerobic bin (⑫), a secondary separator (⑬), a purification and disinfection bin (⑭), a filter (⑮) and an artificial wetland (⑯) which are connected in sequence, and on the basis of embodiment 1, the oxygen explosion tank (c) is connected with the sewage heater (r) and then connected with the primary separator (ninc).
And flocculating agent and coagulant adding devices are arranged in the primary separator, the secondary separator and the ⑬.
The bottom of the primary separator ninthly and the bottom of the secondary separator ⑬ are both provided with a timing electric controllable valve, and the primary separator ninthly and the secondary separator ⑬ are connected with a reflux pool ⑰ through electric controllable valves.
The reflux pool (9328) is connected with the sludge pool (c) and the oxygen explosion pool (c), sewage is oxidized in the oxygen explosion pool (c) and then enters a primary separator (c) through a heater (c), and sludge and organic matter molecules dissolved in water are coagulated into macromolecules under the action of a flocculating agent and a coagulant agent. Combined with precipitation at the bottom of primary separator, sewage is delivered to regulation cabin (R) of sewage, which is automatically regulated according to sewage flow. Sewage is sent into a microbial degradation bin ⑪, an aeration system for the breathing of microbes is arranged in the microbial degradation bin ⑪, and inhabiting rope-type fillers are arranged. The ammonia species in the wastewater are converted into nitrate by the digestive bacteria in the microbial degradation bin ⑪, and then the wastewater in the microbial degradation bin ⑪ is sent to the anaerobic bin ⑫, and the nitrate in the wastewater is converted into nitrogen by the denitrifying bacteria in the anaerobic bin ⑫. So that the nitrate in the organic fertilizer is decomposed. Then, the sewage in the anaerobic bin ⑫ is sent into a secondary separator ⑬ for secondary coagulation and precipitation, and sludge and organic matters dissolved in water in the sewage are deeply separated. The controllable electric valves at the bottom of the primary separator ninthly and the secondary separator ⑬ are opened at regular time. Discharging the precipitate into a reflux tank ⑰, wherein part of sewage enters a reflux tank ⑰ along with the precipitate in the discharging process, the reflux tank 9328contains sewage and sludge, the precipitated sludge is sent into a sludge tank (sixth), the sewage is sent into an oxygen explosion tank (fifth), the sewage treated by a secondary separator ⑬ enters a purification and disinfection bin ⑭ for disinfection, the disinfected water enters a filter ⑮ for filtration to remove fine suspended matters in the sewage, and the filtered water is sent into an artificial wetland ⑯ to eliminate possible residual pollution components, so that the national discharge standard is reached. And (4) discharging or discharging into an ecological farmland.
The following table is a comparison table of indexes of water before and after the feces separation in example 2
In the table, pH is a pH value indicating a pH value, COD represents a chemical oxygen demand, P represents phosphorus, and SS represents suspended matter.
Claims (8)
1. The utility model provides a dirty sewage treatment system of scale plant excrement which characterized in that includes: dirty catch basin of excrement (1), the dirty separating centrifuge of excrement (2), first sedimentation tank (3), second sedimentation tank (4), explode oxygen pond (5), sludge impoundment (6) and mud filter pressing mechanism (7), the dirty catch basin of excrement (1) links to each other with the dirty separating centrifuge of excrement (2), and the export of the dirty separating centrifuge of excrement (2) is connected with first sedimentation tank (3), and first sedimentation tank (3) are connected with second sedimentation tank (4) and sludge impoundment (6) respectively, and second sedimentation tank (4) are connected with exploding oxygen pond (5) and sludge impoundment (6) respectively, and sludge impoundment (6) are connected with filter pressing mud mechanism (7), and mud filter pressing mechanism (7) are connected with exploding oxygen pond (5).
2. A fecal sewage treatment system for large-scale farms according to claim 1, further comprising a sewage heater (8), a primary separator (9), a sewage conditioning bin (10), a microbial degradation bin (11), an anaerobic bin (12), a secondary separator (13), a purification and disinfection bin (14) and a filter (15) connected in sequence, wherein the oxygen explosion tank (5) is connected with the sewage heater (8).
3. The system for treating fecal sewage of large-scale farms according to claim 2, wherein flocculants and/or coagulants are added to the fecal sewage separator (2), the primary separator (9) and the secondary separator (13).
4. A fecal sewage treatment system for a large-scale farm according to claim 3, further comprising a reflux pool (17), wherein the bottoms of the primary separator (9) and the secondary separator (13) are provided with controllable valves, the primary separator (9) and the secondary separator (13) are connected with the reflux pool (17) through the controllable valves, and the reflux pool (17) is respectively connected with the sludge pool (6) and the oxygen explosion pool (5).
5. A working method of the large-scale farm fecal sewage treatment system according to any of the claims 1-4, characterized by comprising the steps of:
s1, enabling the sewage in the farm to intensively enter a sewage collecting tank (1);
s2, enabling dirt in the dirt collecting tank (1) to enter a dirt separator (2) to separate dirt sludge and sewage, wherein the dirt separator (2) comprises a filter screen, a flocculating agent and a coagulant adding mechanism;
s3, enabling the dirt separated from the dirt separator (2) to enter a first sedimentation tank (3), enabling the dirt added with a flocculating agent and a coagulant to enter the first sedimentation tank (3) and then be precipitated, enabling the precipitated liquid sewage to enter a second sedimentation tank (4) for secondary sedimentation, enabling the liquid sludge in the first sedimentation tank (3) and the liquid sludge in the second sedimentation tank (4) to enter a sludge tank (6), and enabling the sewage in the second sedimentation tank (4) to enter an oxygen explosion tank (5);
s4, collecting sludge in the sludge tank (6), compressing and filtering the sludge by using a sludge press-filtering mechanism (7), pressing the sludge into a sludge cake, then sending the sludge cake to a feces accumulation fermentation bin for natural fermentation, and making sewage extruded from the sludge flow to an oxygen explosion tank (5) in the sludge press-filtering process.
6. The method for operating a system for treating fecal sewage of a large-scale farm according to claim 5, wherein the sewage in the S4 anoxic pond directly enters the oxidation pond to be used as the spare water for farm irrigation.
7. The working method of the fecal sewage treatment system of the large-scale farm according to claim 5, wherein the sewage in the S3 mesoscale oxygen aeration tank enters the primary separator (9) through the heater (8) for sewage separation, the primary separator (9) is added with flocculant and/or coagulant, the sludge generated by the primary separator (9) is sent to the return tank (17) through the controllable valve at the bottom, the generated sewage enters the sewage adjusting bin (10), the sewage coming out of the sewage adjusting bin (10) enters the microbial degradation bin (11), the sewage coming out of the microbial degradation bin (11) enters the anaerobic bin (12), the sewage coming out of the anaerobic bin (12) enters the secondary separator (13), the flocculant and/or coagulant are added in the secondary separator (13), the sludge generated by the secondary separator (13) is sent to the return tank (17) through the controllable valve at the bottom, and the sewage generated by the secondary separator (13) is sent to a purification and disinfection bin (14) for disinfection treatment, the sewage from the purification and disinfection bin (14) enters a filter (15) for filtration, and then enters an artificial wetland (16) for discharge after filtration.
8. The working method of the fecal sewage treatment system of large-scale farm according to claim 7 wherein the reflux pool (17) collects the sludge coagulated by the primary separator (9) or the secondary separator (13) and part of the sewage, the sludge is sent to the sludge pool (6) after being precipitated, and the sewage enters the oxygen explosion pool (5) for treatment.
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