CN111807609A - Method for treating vegetable leaf/fruit and vegetable garbage waste water biogas slurry - Google Patents
Method for treating vegetable leaf/fruit and vegetable garbage waste water biogas slurry Download PDFInfo
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- CN111807609A CN111807609A CN202010559050.9A CN202010559050A CN111807609A CN 111807609 A CN111807609 A CN 111807609A CN 202010559050 A CN202010559050 A CN 202010559050A CN 111807609 A CN111807609 A CN 111807609A
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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
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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
- C02F11/12—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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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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
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention discloses a method for treating vegetable leaf/fruit and vegetable garbage waste water biogas slurry, which comprises the following steps: (1) the vegetable leaf/fruit and vegetable stock solution is pumped into a flocculation reaction tank, a flocculating agent PAM is added, and suspended matters are removed by sedimentation in a sedimentation tank; (2) feeding the biogas slurry into a reaction tank, adding a flocculating agent PAM, and then feeding the biogas slurry into a vertical flow sedimentation tank; (3) the settled biogas slurry passes through an adjusting tank and an air flotation tank; (4) the air-float effluent enters an A pool and an O pool, and the vegetable juice/fruit and vegetable water is input into a first-stage A pool and a second-stage A pool as a supplementary carbon source by a carbon source storage tank through a pump; (5) and the effluent of the second-stage O tank enters a decoloring tank and is in the decoloring tank. The invention has the beneficial effects that: by utilizing the two-stage AO reaction tank, the ammonia nitrogen can be fully converted into nitrate nitrogen in the aerobic section, and the nitrate nitrogen is converted into nitrogen in the anoxic section for discharge. And two-stage treatment ensures that the water quality is stable and reaches the first-stage A discharge. The treatment of total nitrogen and ammonia nitrogen is discharged after reaching standards; the cost of adding the carbon source is reduced.
Description
Technical Field
The invention relates to a method for treating vegetable leaf/fruit and vegetable garbage waste water biogas slurry.
Background
The great development of a large amount of large-scale biogas engineering, the generation of a large amount of anaerobic digestate, the imperfect biogas slurry storage and transportation facilities, and the dispersion of agricultural land management, which leads to the failure of wide implementation of biogas slurry returning, direct discharge and environmental pollution. Meanwhile, the components of the biogas slurry are greatly different according to different fermentation products. Excessive biogas slurry is discharged after reaching the standard after being treated. Taking the treatment of the waste vegetable leaf/fruit and vegetable garbage waste biogas slurry as an example, COD in the biogas slurry is 4000-5000 mg/L, ammonia nitrogen is about 1500mg/L, total nitrogen is 1500-1700 mg/L, and total phosphorus is 20-50 mg/L. The high-nitrogen biogas slurry wastewater is difficult to treat, and the high-nitrogen biogas slurry wastewater is difficult to treat and discharge after reaching standards by the conventional process.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for treating the biogas slurry in the vegetable leaf/fruit and vegetable garbage wastewater, which can treat the wastewater to reach the first-level A and discharge the wastewater after reaching the standard, and reduces the problems of excessive biogas slurry storage and environmental pollution.
The object of the present invention is achieved by the following technical means. A method for treating vegetable leaf/fruit and vegetable garbage waste water biogas slurry comprises the following steps:
(1) conveying the vegetable leaf/fruit and vegetable stock solution into a flocculation reaction tank by using a pump, adding a flocculating agent PAM, settling in a sedimentation tank to remove suspended matters, ensuring that SS (suspended substance) of vegetable juice/fruit and vegetable water is lower than 500mg/L, and conveying the vegetable juice/fruit and vegetable water into a carbon source storage tank to serve as a supplementary carbon source;
(2) feeding a flocculating agent PAM into a biogas slurry input reaction tank, then feeding the biogas slurry into a vertical sedimentation tank, wherein the vertical sedimentation tank is of a water outlet weir trough structure with a high inner part and a low outer part, the biogas slurry after flocculation treatment enters the water outlet weir trough from the periphery, overflows into a middle tank and enters a next procedure, and sludge is isolated in the water outlet weir trough;
(3) the settled biogas slurry passes through an adjusting tank and an air flotation tank, and SS is ensured to be lower than 500mg/L when entering a biochemical system;
(4) enabling air floatation effluent to enter a first-stage A pool, controlling dissolved oxygen to be 0.2-0.5 mg/L, ensuring the nitration reaction to be carried out, and converting nitrate nitrogen into nitrogen to be discharged; nine first-stage O tanks are connected behind the first-stage A tank in series, and dissolved oxygen is ensured to be 2-4 mg/L through blast aeration, so that ammonia nitrogen is converted into nitrate nitrogen; the first-stage O tank is connected with the second-stage A tank in series, so that denitrification reaction and denitrification are further enhanced, the wastewater subsequently enters the second-stage O tank, an MBR membrane tank is arranged in the second-stage O tank, and residual ammonia nitrogen and refractory organic matters in the wastewater are further removed, so that the effluent is ensured to stably reach the standard; wherein, the carbon source storage tank inputs vegetable juice/fruit and vegetable water as a supplementary carbon source into the first-stage A pool and the second-stage A pool through a pump;
(5) and the effluent of the second-stage O tank enters a decoloring tank, and in the decoloring tank, the ozone and water are fully reacted by aeration of a gas-liquid mixing pump, the chroma is reduced to below 30 from 500, and then the effluent enters a clean water tank.
Furthermore, the sludge from the vertical flow sedimentation tank, the air flotation tank and the secondary O tank passes through a sludge concentration tank and a sludge dewatering machine to be made into sludge, a sludge return pipeline is arranged in the secondary O tank, and a part of the sludge returns to the primary O tank.
Furthermore, a mixed liquid return pipe is arranged in the last O tank in the first-stage O tank, and the mixed liquid is returned to the front end of the first-stage A tank from the tail end of the first-stage O tank.
The invention has the beneficial effects that:
1. by utilizing the two-stage AO reaction tank, the ammonia nitrogen can be fully converted into nitrate nitrogen in the aerobic section, and the nitrate nitrogen is converted into nitrogen in the anoxic section for discharge. And two-stage treatment ensures that the water quality is stable and reaches the first-stage A discharge. Realizes the discharge of the total nitrogen and ammonia nitrogen after reaching the standard
2. Because the carbon source supplement cost is high, the waste vegetable, leaf, fruit and vegetable juice is used as the carbon source supplement; the cost of adding the carbon source is reduced, the COD of the vegetable juice is up to 15000mg/L, the vegetable juice can be used as the carbon source for supplement, meanwhile, the abandoned vegetable leaves are recycled as garbage, and the cost is low.
3. The problem of the mud that floats in the sedimentation tank is more, reduces and directly arranges into follow-up technology is solved. Utilize vertical flow sedimentation tank and MBR membrane cisterna after the improvement, detain mud in the inside of system, combine second grade O pond and secondary sedimentation tank simultaneously, compact structure.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
FIG. 2 is a schematic structural diagram of the vertical sedimentation tank of the present invention.
Detailed Description
The invention will be described in detail below with reference to the following drawings:
as shown in the figure, the method for treating the vegetable leaf/fruit and vegetable garbage wastewater biogas slurry comprises the following steps:
(1) conveying the vegetable leaf/fruit and vegetable stock solution into a flocculation reaction tank by a pump, pretreating, adding a flocculating agent PAM, precipitating in a sedimentation tank to remove suspended matters, ensuring that SS (suspended substance) of vegetable juice/fruit and vegetable water is lower than 500mg/L, and conveying the vegetable leaf/fruit and vegetable stock solution into a carbon source storage tank to serve as a supplementary carbon source;
(2) the biogas slurry is input into a reaction tank, a flocculating agent PAM is added, then the biogas slurry enters a vertical sedimentation tank, the vertical sedimentation tank is of a water outlet weir trough 1 structure (in a shape of Chinese character 'hui'), the biogas slurry after flocculation treatment enters the water outlet weir trough 1 from the periphery, overflows into a middle tank and enters a next procedure, and sludge is isolated in the water outlet weir trough 1; removing high SS, partial ammonia nitrogen, total nitrogen, COD, total phosphorus and other substances;
can up float after SS flocculation in view of this type of quality of water, conventional play water weir notch is from the middle intaking, can lead to a large amount of direct follow-up processes that get into of mud floating, to this type of problem, proposes to adjust out the water weir notch into peripheral intaking, blocks most middle mud floating and gets into follow-up link, can effectively keep apart a large amount of mud floating in the middle, guarantees that the play water matter is stable.
(3) The settled biogas slurry passes through an adjusting tank and an air flotation tank, and SS is ensured to be lower than 500mg/L when entering a biochemical system; suspended matters in the wastewater are flocculated and precipitated by adding PAM, and fine suspended matters float upwards by virtue of air flotation and are adsorbed on bubbles, so that the removal of SS is realized. Meanwhile, the biogas slurry with large water quality fluctuation is homogenized by the adjusting tank, and the cluster load caused by the water quality fluctuation is reduced.
(4) Enabling air floatation effluent to enter a first-stage A pool, controlling dissolved oxygen to be 0.2-0.5 mg/L, ensuring the nitration reaction to be carried out, and converting nitrate nitrogen into nitrogen to be discharged; nine first-stage O tanks are connected behind the first-stage A tank in series, and dissolved oxygen is ensured to be 2-4 mg/L through blast aeration, so that ammonia nitrogen is converted into nitrate nitrogen; the first-stage O tank is connected with the second-stage A tank in series, so that denitrification reaction and denitrification are further enhanced, the wastewater subsequently enters the second-stage O tank, an MBR membrane tank is arranged in the second-stage O tank, and residual ammonia nitrogen and refractory organic matters in the wastewater are further removed, so that the effluent is ensured to stably reach the standard;
in view of the main water quality parameters of the biogas slurry: about 4000mg/L of CDO, about 1700mg/L of total nitrogen, unfavorable carbon-nitrogen ratio for biochemical treatment, need of adding glucose/methanol to supplement carbon source, and increase of water quality treatment cost. According to experimental determination, after suspended matters in fresh vegetable juice/fruit and vegetable water are removed through flocculation precipitation, COD is about 15000mg/L, and total nitrogen is about 1600mg/L, so that the fresh vegetable juice/fruit and vegetable water can be used as a carbon source for supplement, purchase of medicaments is reduced, and treatment cost is reduced; the carbon source storage tank inputs vegetable juice/fruit and vegetable water as a supplementary carbon source into the first-stage A pool and the second-stage A pool through a pump; in general water quality treatment, carbon source supplement is only carried out in a first-stage A section, and in consideration of high total nitrogen of biogas slurry water, proper carbon source supplement is particularly carried out in a second-stage A tank to further remove the total nitrogen, ensure the stability of effluent water quality and improve impact load.
(5) The membrane pool discharges water through a suction pump, the effluent of the second-stage O pool enters a decoloring pool, and in the decoloring pool, the ozone and the water are fully reacted through aeration of a gas-liquid mixing pump, and the design treatment flow is 75m3The adding amount of the ozone is 6000g/h, the retention time is 1.5h, and the effluent chroma can be reduced to below 30. And then enters a clean water pool. Ozone has strong oxidizing property, and a gas-liquid mixing pump is used for aeration, so that the utilization rate of ozone is ensured, and the decolorizing effect is realized.
In the system, mixed liquid flows back, a mixed liquid return pipe is arranged in the last O tank in the first-stage O tank, the mixed liquid flows back to the front end of the first-stage A tank from the tail end of the first-stage O tank, and the retention time of the biogas slurry in the tank is prolonged. Simultaneously, sludge coming out of the vertical flow sedimentation tank, the air floatation tank and the secondary O tank passes through a sludge concentration tank, a sludge dewatering machine is used for preparing the sludge, a sludge return pipeline is arranged in the secondary O tank, and one part of the sludge flows back to the primary O tank, so that the stability of the content of microorganisms in the system is ensured. The main aeration mode depends on jet aeration to ensure the dissolved oxygen in water.
It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.
Claims (3)
1. A method for treating vegetable leaf/fruit and vegetable garbage waste water biogas slurry is characterized by comprising the following steps: the method comprises the following steps:
(1) conveying the vegetable leaf/fruit and vegetable stock solution into a flocculation reaction tank by using a pump, adding a flocculating agent PAM, settling in a sedimentation tank to remove suspended matters, ensuring that SS (suspended substance) of vegetable juice/fruit and vegetable water is lower than 500mg/L, and conveying the vegetable juice/fruit and vegetable water into a carbon source storage tank to serve as a supplementary carbon source;
(2) the biogas slurry is input into a reaction tank, a flocculating agent PAM is added, then the biogas slurry enters a vertical sedimentation tank, the vertical sedimentation tank is of a water outlet weir trough (1) structure with a high inner part and a low outer part, the biogas slurry after flocculation treatment enters the water outlet weir trough (1) from the periphery, overflows into a middle tank and enters a next procedure, and sludge is isolated in the water outlet weir trough (1);
(3) the settled biogas slurry passes through an adjusting tank and an air flotation tank, and SS is ensured to be lower than 500mg/L when entering a biochemical system;
(4) enabling air floatation effluent to enter a first-stage A pool, controlling dissolved oxygen to be 0.2-0.5 mg/L, ensuring the nitration reaction to be carried out, and converting nitrate nitrogen into nitrogen to be discharged; nine first-stage O tanks are connected behind the first-stage A tank in series, and dissolved oxygen is ensured to be 2-4 mg/L through blast aeration, so that ammonia nitrogen is converted into nitrate nitrogen; the first-stage O tank is connected with the second-stage A tank in series, so that denitrification reaction and denitrification are further enhanced, the wastewater subsequently enters the second-stage O tank, an MBR membrane tank is arranged in the second-stage O tank, and residual ammonia nitrogen and refractory organic matters in the wastewater are further removed, so that the effluent is ensured to stably reach the standard; wherein, the carbon source storage tank inputs vegetable juice/fruit and vegetable water as a supplementary carbon source into the first-stage A pool and the second-stage A pool through a pump;
(5) and the effluent of the second-stage O tank enters a decoloring tank, and in the decoloring tank, the ozone and water are fully reacted by aeration of a gas-liquid mixing pump, the chroma is reduced to below 30 from 500, and then the effluent enters a clean water tank.
2. The method for treating the vegetable leaf/fruit and vegetable garbage wastewater biogas slurry as claimed in claim 1, wherein the method comprises the following steps: sludge from the vertical flow sedimentation tank, the air flotation tank and the secondary O tank passes through the sludge concentration tank, the sludge dewatering machine is made into sludge, a sludge return pipeline is arranged in the secondary O tank, and a part of sludge flows back to the primary O tank.
3. The method for treating the vegetable leaf/fruit and vegetable garbage wastewater biogas slurry as claimed in claim 1, wherein the method comprises the following steps: and a mixed liquid return pipe is arranged in the last O tank in the first-stage O tank, and the mixed liquid is returned to the front end of the first-stage A tank from the tail end of the first-stage O tank.
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| CN202010559050.9A CN111807609A (en) | 2020-06-18 | 2020-06-18 | Method for treating vegetable leaf/fruit and vegetable garbage waste water biogas slurry |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112547758A (en) * | 2020-11-18 | 2021-03-26 | 陆良中金环保科技有限公司 | Combined process for harmlessly treating vegetable leaf/fruit and vegetable garbage and recycling |
| CN113149344A (en) * | 2021-03-29 | 2021-07-23 | 昆明理工大学 | Processing method of vegetable juice stock solution |
| CN117756318A (en) * | 2023-12-08 | 2024-03-26 | 上海汲隆水务科技有限公司 | Nitrogen removal process for sludge wastewater in through ditch |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112547758A (en) * | 2020-11-18 | 2021-03-26 | 陆良中金环保科技有限公司 | Combined process for harmlessly treating vegetable leaf/fruit and vegetable garbage and recycling |
| CN113149344A (en) * | 2021-03-29 | 2021-07-23 | 昆明理工大学 | Processing method of vegetable juice stock solution |
| NL2028159B1 (en) | 2021-03-29 | 2022-10-12 | Univ Kunming Science & Technology | Method for treating vegetable-squeezed waste liquid |
| CN117756318A (en) * | 2023-12-08 | 2024-03-26 | 上海汲隆水务科技有限公司 | Nitrogen removal process for sludge wastewater in through ditch |
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Application publication date: 20201023 |
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