CN114249418A - Method and device for treating garbage leachate by utilizing excess sludge of sewage treatment plant - Google Patents
Method and device for treating garbage leachate by utilizing excess sludge of sewage treatment plant Download PDFInfo
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- CN114249418A CN114249418A CN202111493661.9A CN202111493661A CN114249418A CN 114249418 A CN114249418 A CN 114249418A CN 202111493661 A CN202111493661 A CN 202111493661A CN 114249418 A CN114249418 A CN 114249418A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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Abstract
The invention discloses a method and a device for treating waste leachate by utilizing excess sludge of a sewage treatment plant, the process comprises sludge inoculation, reactor temperature increase, continuous water inlet, load increase, water outlet and methane discharge, and the device comprises an adjusting tank, a water inlet pump, an anaerobic reactor, a circulating pump, a sludge discharge pump, a flowmeter, a thermometer and a control system; the anaerobic reactor can be divided into a water distribution zone, an expanded sludge bed zone, a three-phase separator, a sludge inclined plate settling zone, a water outlet weir and a gas-liquid separator from bottom to top. The invention adopts the excess sludge of the municipal sewage plant as the inoculated sludge, improves the structure of the anaerobic reactor, mainly improves the water distributor and the external circulation, increases the inclined plate sedimentation area of the sludge, greatly reduces the inoculation cost, efficiently reserves the number of anaerobic microorganisms in the reactor, effectively discharges the excess sludge or the calcified sludge, prevents the blockage of the water distributor, and reduces the formation of the sludge dead zone of the anaerobic reactor and the overhaul and maintenance cost.
Description
Technical Field
The invention belongs to the field of urban pollution treatment, and particularly relates to a method and a device for treating garbage leachate by using excess sludge of a sewage treatment plant.
Background
In the existing leachate wastewater treatment process of a waste incineration plant or a waste transfer station, an anaerobic reactor has the advantages of low operation energy consumption, high organic load, low nitrogen and phosphorus nutrition requirement, low residual sludge yield, biogas energy generation and the like, and is widely applied to the leachate wastewater treatment of the waste. And the high-activity methanogens are the key points of the high-efficiency stable operation of the anaerobic reactor. The traditional anaerobic reactor adopts anaerobic granular sludge for inoculation operation, the granular sludge has few sources, high cost (more than or equal to 1200 yuan/ton), easy crushing and serious sludge loss, thereby influencing the operation stability of the anaerobic reactor. Therefore, in order to further reduce the investment and operation costs and ensure the operation efficiency of the anaerobic reactor, it is necessary to improve the existing process to solve the above problems.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method and a device for treating waste leachate by utilizing excess sludge of a sewage treatment plant, which improve the operation stability and efficiency of an anaerobic reactor and promote the biochemical reaction of the sludge and waste water.
The technical scheme is as follows: the method for treating the garbage leachate by utilizing the excess sludge of the sewage treatment plant comprises the following steps:
(1) inoculating the excess sludge of the urban sewage treatment plant in an anaerobic reactor;
(2) controlling the COD load of the inlet water according to the indexes of the inlet water quality, ammonia nitrogen and calcium ions;
(3) the anaerobic reactor is in the form of a cylindrical steel structure with external circulation, the hydraulic retention time is 4.5-6d, and the COD volume load is 5-10 COD/(m)3D), controlling the operation temperature to be 30-35 ℃, and dividing the anaerobic reactor into a water distribution zone, an expanded sludge bed zone, a three-phase separator, a sludge inclined plate settling zone, a water outlet weir and a gas-liquid separator from bottom to top;
(4) after the sludge is connected into an anaerobic reactor, the reactor is filled with raw water, the temperature of the reactor is raised to 30-35 ℃ through steam or hot water circulation, an external circulating pump is started for hydraulic stirring and mixing, and when the pH value of a water body in the reactor is more than 7.5 and VFAs is less than 2000mg/L, continuous water inlet operation is started;
(5) in the continuous water inlet process, the anaerobic reactor gradually increases the COD load by increasing the water inlet amount, and the COD starting load is 1-3 kgCOD/(m)3D); when the methane yield is more than 0.35m3When the removal rate of/kgCOD and COD is more than 75%, further increasing the water inflow, and finally increasing the water inflow to the designed COD load, and stopping further increasing the water inflow;
(6) the water inlet of the anaerobic reactor is pumped into the bottom of the reactor by a water pump, is mixed with the circulating reflux water outside the reactor in the water distributor to form rotational flow, and enters a sludge bed zone in a tangential flow state;
(7) the waste water, the sludge and the methane are subjected to solid-liquid-gas separation through a three-phase separator, the separated water body enters a sludge settling zone and is blocked by an inclined plate, and the ascending flow velocity of the settling zone is less than or equal to 0.2 m/h;
(8) the biogas generated in the reactor enters a gas-liquid separator at the top, the biogas stays in the gas-liquid separator for a certain time, the separated biogas is safely combusted or recycled, and the wastewater carried in the rising process of the biogas falls into the bottom of the reactor through a middle return pipe under the action of gravity to form internal circulation; during the operation of the reactor, the flow, the temperature, the pH value and the methane flow are detected by an online instrument.
Further, in the step (1), the inoculation amount of the anaerobic reactor is 10-20kgTS/m3The water content of the inoculated sludge is 80-90%.
Further, in the step (2), the water quality index of the inlet water is COD: 10000 + 80000mg/L, BOD5: 5000-40000mg/L, ammonia nitrogen: 500-2000mg/L, calcium ion: 500-1500mg/L, SS: 1000-2500 mg/L.
Further, in the step (6), the water distribution ascending flow speed in the water distributor is 0.5-1.0 m/h.
Further, in the step (7), the inclined plate is inclined at an angle of 60-80 degrees.
Further, in the step (8), the retention time of the biogas in the gas-liquid separator is 5-10 s.
The invention also provides a device for treating the landfill leachate by utilizing the excess sludge of the sewage treatment plant, which comprises an adjusting tank, a water inlet pump, an anaerobic reactor, a circulating pump, a sludge discharge pump, a flowmeter, a thermometer and a control system; the anaerobic reactor can be divided into a water distribution zone, an expanded sludge bed zone, a three-phase separator, a sludge inclined plate settling zone, a water outlet weir and a gas-liquid separator from bottom to top; the adjusting tank is connected with the water distribution area through a water inlet pump, the center of the bottom of the reactor is connected with a sludge discharge pump, the water distribution area and the expanded sludge bed area are connected with a circulating pump, and a control system controls the whole device to operate.
Furthermore, the height-diameter ratio of the anaerobic reactor is 2-5, the water distributor adopts an inverted cone structure, and the water distribution plates in the water distribution area are mutually overlapped, so that the sedimentation and uniform discharge of anaerobic excess sludge are facilitated while the tangential flow state of inlet water is ensured. The sludge discharge port of the sludge discharge pump is arranged in the middle of the water distributor.
Furthermore, an external circulation water suction port is arranged at a position 10-50cm away from the bottom of the three-phase separator, the external circulation water suction ports are uniformly arranged at 8-10 positions, the external circulation water flows back to a water distribution area at the bottom of the reactor through an external circulation pump, and the ratio of the flow rate of the external circulation pump to the bottom area of the anaerobic reactor is 0.5-1.0.
Further, the bottom of the gas-liquid separator is connected to the water distribution area through an internal reflux water pipe.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the invention adopts the excess sludge of the municipal sewage treatment plant as the inoculation sludge, improves the structure of the anaerobic reactor (improves the water distributor and the external circulation, increases the inclined plate sedimentation area of the sludge), optimizes the starting operation of the reactor, and can greatly reduce the inoculation cost which is only 20 percent of the granular sludge. Under the process condition of the invention, the COD load of the anaerobic reactor can be increased to 5-10kgCOD/m3And d is more than 2 times of that of the traditional anaerobic reactor in application of the waste leachate. Under the original process conditions, the SS of the effluent of the anaerobic process is usually more than 5000mg/L and even more than 10000mg/L, and the SS of the effluent can be lower than 2000mg/L by increasing a sludge inclined plate settling zone and an external circulation pump suction opening arranged at the lower part of a three-phase separator, so that the number of anaerobic microorganisms in a reactor is effectively reserved, and the influence on the subsequent process is reduced. Finally, by adopting the water distributor with the inverted cone structure, the excess sludge or the calcified sludge in the anaerobic reactor can be effectively discharged, the blockage of the water distributor is prevented, and the formation of a sludge dead zone of the anaerobic reactor and the maintenance cost are reduced.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a sectional view of an anaerobic reactor of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1-2, wherein 1, regulating pool; 2. a water inlet pump; 3. a water inlet flow meter; 4. a circulation flow meter; 5. A circulation pump; 6. a water distributor; 7. an expanded sludge bed zone; 8. a three-phase separator; 9. an inclined plate sedimentation zone; 10. a biogas lift pipe; 11. a gas-liquid separator; 12. a biogas outlet; 13. a sludge discharge pump; 14. an online pH meter; 15. an online temperature detector; 16. a control system; 17. a water inlet/circulation pipe; 18. a water inlet branch pipe; 19. a water distributor; 20. a sludge discharge pipe; 21. an inner return pipe; 22. a three-phase separator; 23. a sludge inclined plate settling zone; 24. a water outlet pipe; 25. a biogas lift pipe; 26. a gas-liquid separator; 27. an external circulation pipe; 28. and (7) a water outlet.
The invention provides a device for treating waste leachate by utilizing excess sludge of a sewage treatment plant, which comprises an adjusting tank, a water inlet pump, an anaerobic reactor, a circulating pump, a sludge discharge pump, a flowmeter, a thermometer and a control system, wherein the adjusting tank is connected with the water inlet pump; the anaerobic reactor can be divided into a water distribution zone, an expanded sludge bed zone, a three-phase separator, a sludge inclined plate settling zone, a water outlet weir and a gas-liquid separator from bottom to top; the adjusting tank is connected with the water distribution area through a water inlet pump, the center of the bottom of the reactor is connected with a sludge discharge pump, the water distribution area and the expanded sludge bed area are connected with a circulating pump, and a control system controls the whole device to operate. The height-diameter ratio of the anaerobic reactor is 2-5, the water distributor adopts an inverted cone structure, and water distribution plates in a water distribution area are mutually overlapped, so that the sedimentation and the uniform discharge of anaerobic residual sludge are facilitated while the tangential flow state of inlet water is ensured. The sludge discharge port of the sludge discharge pump is arranged in the middle of the water distributor. The bottom 10-50cm of the three-phase separator is provided with an external circulation water suction port which is uniformly distributed at 8-10 positions and flows back to a water distribution area at the bottom of the reactor through an external circulation pump, and the ratio of the flow rate of the external circulation pump to the bottom area of the anaerobic reactor is 0.5-1.0. The bottom of the gas-liquid separator is connected to the water distribution area through an internal reflux water pipe.
Example (b): 200m3Leachate waste water anaerobic reactor of/d garbage transfer station
(1) Quality index of inlet water
(2) Design parameters of anaerobic reactor
(3) Inoculating sludge
The inoculated sludge is obtained from the residual sludge of the nearby municipal sewage treatment plant, and the inoculum size of the anaerobic reactor is 15kgTS/m3The water content of the inoculated sludge is 85 percent, and the effective volume of the anaerobic reactor is 979.68m3The total amount of inoculated sludge is 97.97 tons. After the inoculation of the sludge is completed, the reactor is filled with raw water, and the temperature of the reactor is raised to 30-35 ℃ through boiler hot water circulation. And starting an external circulating pump to perform hydraulic stirring and mixing, and after continuous circulating stirring for 7d, starting continuous water inlet operation when the pH of the water body in the reactor is 7.9 and the VFAs is 1600 mg/L.
| Serial number | Item | Numerical value | Unit of | Remarks for |
| 1 | Effective volume | 979.68 | m3 | Reactor with a reactor shellDiameter 8m, |
| 2 | Treating water quantity | 200.00 | Ton/ |
|
| 3 | Inoculation amount per unit volume | 15.00 | kg/m3 | Dry weight of |
| 4 | Total inoculum size | 14.70 | Ton of | Dry weight of |
| 5 | Water content of inoculated sludge | 0.85 | Sludge determination after filter pressing | |
| 6 | Total amount of sludge | 97.97 | Ton of |
(4) Continuous water feeding
The anaerobic reactor gradually increases the COD load by increasing the water inflow, and the COD starting load is 2 kgCOD/(m)3D) when the biogas yield is > 0.35m3When the removal rate of/kgCOD and COD is more than 75%, the water inflow is further increased, and after 30 days of operation, the COD load value of the anaerobic reactor can be stabilized at 6-6.12 kgCOD/(m)3D), the COD of the treated wastewater is lower than 3500mg/L, and the removal rate of the COD is stabilized to be more than 85 percent.
| Parameter(s) | Unit of | Sludge domestication | Load enhancement | Stable operation |
| Water inflow | (m3/d) | 65 | 100-180 | 200 |
| COD load | (kg COD/(m3·d)) | 2 | 3-5.5 | 6-6.12 |
| Hydraulic retention time | (d) | 15 | 5.4-9.8 | 4.9 |
| Run time | (d) | 10 | 10 | 10 |
Claims (10)
1. A method for treating garbage leachate by utilizing excess sludge of a sewage treatment plant is characterized by comprising the following steps:
(1) inoculating the excess sludge of the urban sewage treatment plant in an anaerobic reactor;
(2) controlling the COD load of the inlet water according to the indexes of the inlet water quality, ammonia nitrogen and calcium ions;
(3) the anaerobic reactor is in the form of a cylindrical steel structure with external circulation, the hydraulic retention time is 4.5-6d, and the COD volume load is 5-10 COD/(m)3D), controlling the operation temperature to be 30-35 ℃, and dividing the anaerobic reactor into a water distribution zone, an expanded sludge bed zone, a three-phase separator, a sludge inclined plate settling zone, a water outlet weir and a gas-liquid separator from bottom to top;
(4) after the sludge is connected into an anaerobic reactor, the reactor is filled with raw water, the temperature of the reactor is raised to 30-35 ℃ through steam or hot water circulation, an external circulating pump is started for hydraulic stirring and mixing, and when the pH value of a water body in the reactor is more than 7.5 and the VFAs is less than 2000mg/L, continuous water inlet operation is started;
(5) in the continuous water inlet process, the anaerobic reactor gradually increases the COD load by increasing the water inlet amount, and the COD starting load is 1-3 kgCOD/(m)3D); when the methane yield is more than 0.35m3When the removal rate of/kgCOD and COD is more than 75%, further increasing the water inflow, finally increasing the water inflow to the designed COD load, and stopping further increasing the water inflow load;
(6) the water inlet of the anaerobic reactor is pumped into the bottom of the reactor by a water pump, is mixed with the circulating reflux water outside the reactor in the water distributor to form rotational flow, and enters a sludge bed zone in a tangential flow state;
(7) the waste water, the sludge and the methane are subjected to solid-liquid-gas separation through a three-phase separator, the separated water body enters a sludge settling zone and is blocked by an inclined plate, and the ascending flow velocity of the settling zone is less than or equal to 0.2 m/h;
(8) the biogas generated in the reactor enters a gas-liquid separator at the top, the biogas stays in the gas-liquid separator for a certain time, the separated biogas is safely combusted or recycled, and the wastewater carried in the rising process of the biogas falls into the bottom of the reactor through a middle return pipe under the action of gravity to form internal circulation; during the operation of the reactor, the flow, the temperature, the pH value and the methane flow are detected by an online instrument.
2. The method for treating waste leachate using excess sludge from a sewage treatment plant according to claim 1, wherein the inoculation amount of the anaerobic reactor in the step (1) is 10 to 20kgTS/m3And the water content of the inoculated sludge is 80-90 percent.
3. The method for treating landfill leachate with excess sludge of a sewage treatment plant according to claim 1, wherein in the step (2), the water quality index of the inlet water is COD: 10000 + 80000mg/L, BOD5: 5000-40000mg/L, ammonia nitrogen: 500-2000mg/L, calcium ion: 500-1500mg/L, SS: 1000-2500 mg/L.
4. The method for treating waste leachate using excess sludge from a sewage treatment plant according to claim 1, wherein in step (6), the water distribution in the water distributor is increased by a water distribution flow rate of 0.5-1.0 m/h.
5. The method for treating waste leachate using excess sludge from a sewage treatment plant according to claim 1, wherein the inclined plate is inclined at an angle of 60 to 80 ° in step (7).
6. The method for treating waste leachate using excess sludge from a sewage treatment plant according to claim 1, wherein the retention time of the biogas in the gas-liquid separator in step (8) is 5-10 s.
7. A device for treating garbage leachate by utilizing excess sludge of a sewage treatment plant is characterized by comprising an adjusting tank, a water inlet pump, an anaerobic reactor, a circulating pump, a sludge discharge pump, a flowmeter, a thermometer and a control system; the anaerobic reactor can be divided into a water distribution zone, an expanded sludge bed zone, a three-phase separator, a sludge inclined plate settling zone, a water outlet weir and a gas-liquid separator from bottom to top; the adjusting tank is connected with the water distribution area through a water inlet pump, the center of the bottom of the reactor is connected with a sludge discharge pump, the water distribution area and the expanded sludge bed area are connected with a circulating pump, and a control system controls the whole device to operate.
8. The apparatus for treating landfill leachate by using excess sludge from a sewage treatment plant according to claim 8, wherein the height/diameter ratio of the anaerobic reactor is 2 to 5, the water distributor has an inverted cone structure, the water distribution plates in the water distribution area are stacked, and the sludge discharge port of the sludge pump is arranged at the middle position of the water distributor.
9. The apparatus for treating landfill leachate according to claim 8, wherein the water inlets for external circulation are disposed at positions 10-50cm from the bottom of the three-phase separator, and are uniformly distributed at positions 8-10, and the water is returned to the water distribution zone at the bottom of the reactor by the external circulation pump, and the ratio of the flow rate of the external circulation pump to the bottom area of the anaerobic reactor is 0.5-1.0.
10. The apparatus for treating waste leachate using excess sludge from a sewage treatment plant according to claim 8, wherein the bottom of the gas-liquid separator is connected to the water distribution area through an internal reflux water pipe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230166994A1 (en) * | 2021-11-28 | 2023-06-01 | Cambrian Innovation, Inc. | Systems, devices and methods for anaerobically treating wastewater |
| CN118324338A (en) * | 2024-04-19 | 2024-07-12 | 西北农林科技大学 | Aquaculture wastewater discharge treatment device and treatment method |
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| CN201245503Y (en) * | 2008-08-08 | 2009-05-27 | 康升环保(天津)有限公司 | Multi-cycle efficient anaerobic waste water treating device |
| CN203498157U (en) * | 2013-08-13 | 2014-03-26 | 山东建筑大学 | Improved up-flow anaerobic sludge bed (UASB) reactor |
| CN109336254A (en) * | 2018-12-06 | 2019-02-15 | 南通润泽环境工程技术有限公司 | A kind of novel anaerobic reactor for garbage leachate wastewater processing |
| CN210915511U (en) * | 2019-10-29 | 2020-07-03 | 江苏科闻环保科技有限公司 | An anaerobic reactor with heating function |
-
2021
- 2021-12-08 CN CN202111493661.9A patent/CN114249418A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201245503Y (en) * | 2008-08-08 | 2009-05-27 | 康升环保(天津)有限公司 | Multi-cycle efficient anaerobic waste water treating device |
| CN203498157U (en) * | 2013-08-13 | 2014-03-26 | 山东建筑大学 | Improved up-flow anaerobic sludge bed (UASB) reactor |
| CN109336254A (en) * | 2018-12-06 | 2019-02-15 | 南通润泽环境工程技术有限公司 | A kind of novel anaerobic reactor for garbage leachate wastewater processing |
| CN210915511U (en) * | 2019-10-29 | 2020-07-03 | 江苏科闻环保科技有限公司 | An anaerobic reactor with heating function |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230166994A1 (en) * | 2021-11-28 | 2023-06-01 | Cambrian Innovation, Inc. | Systems, devices and methods for anaerobically treating wastewater |
| US11964891B2 (en) * | 2021-11-28 | 2024-04-23 | Cambrian Innovation,Inc. | Systems, devices and methods for anaerobically treating wastewater |
| CN118324338A (en) * | 2024-04-19 | 2024-07-12 | 西北农林科技大学 | Aquaculture wastewater discharge treatment device and treatment method |
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