CN110627321A - Aged refuse landfill leachate full-quantization treatment process and system - Google Patents
Aged refuse landfill leachate full-quantization treatment process and system Download PDFInfo
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- CN110627321A CN110627321A CN201910927633.XA CN201910927633A CN110627321A CN 110627321 A CN110627321 A CN 110627321A CN 201910927633 A CN201910927633 A CN 201910927633A CN 110627321 A CN110627321 A CN 110627321A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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Abstract
The invention relates to a full-quantization treatment process and a system for aged landfill leachate, wherein the process comprises the following steps: the pretreatment system carries out pretreatment, the biochemical treatment system carries out biochemical treatment, the ultrafiltration treatment system carries out ultrafiltration treatment, the high-pressure pipe network type reverse osmosis treatment system carries out reverse osmosis treatment and the evaporation treatment system carries out evaporation treatment; through the process flow, the multi-layer purification and filtration treatment of the aged leachate is realized; the operation conditions of the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system are displayed in a human-computer interaction interface through the control system, the control system regulates and controls all the systems in real time through a preset program, the whole filtration and purification process is stable in operation, zero concentrated solution is discharged, the problem of continuous accumulation of water quality and salt of aged landfill leachate caused by recharging of the concentrated solution is thoroughly solved, and the full-scale treatment of the aged landfill leachate is realized.
Description
Technical Field
The invention belongs to the technical field of landfill leachate, and particularly relates to a full-quantization treatment process for aged landfill leachate.
Background
The landfill leachate is high-concentration organic wastewater which is derived from water contained in garbage in a garbage landfill, rain, snow and water entering the landfill and other water, deducts the saturated water holding capacity of the garbage and a soil covering layer and is formed by passing through the garbage layer and the soil covering layer; there is also water that accumulates to leak out of the waste ready for incineration.
The nature of landfill leachate varies with the duration of the landfill, which is determined primarily by the stabilization process of the landfill. The stabilization process of a landfill is generally divided into five phases, namely an initialization adjustment phase (initialization adjustment phase), a Transition phase (Transition phase), an acidification phase (acid phase), a Methane fermentation phase (Methane fermentation phase) and a Maturation phase (Maturation phase).
The components of the leachate of the landfill site change continuously along with the prolonging of the landfill time, the early leachate generally has the landfill age of 3-5 years, wherein the content of VFA (volatile fatty acid) is higher and can approximately account for more than 50 percent of TOC (total organic carbon), the BOD/COD (biochemical oxygen demand)/Chemical Oxygen Demand (COD) value is higher and is generally 0.4-0.8, the concentration of ammonia nitrogen is about 1000mg/L, and the leachate is easy to biodegrade. The percolate with the landfill age of more than 3-5 years is called aged percolate, the biodegradability ratio of the aged percolate is generally 0.1-0.2, the ammonia nitrogen concentration is increased year by year along with the extension of the landfill age, and the treatment target at the moment is mainly the removal of the ammonia nitrogen; therefore, appropriate measures are taken to improve the biodegradability of the catalyst, so as to improve the operating environment of the subsequent process.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a full-quantitative treatment process for aged landfill leachate, which saves carbon sources, reduces aeration quantity, has thorough filtering effect and resists fouling.
The invention also aims to provide a full-quantitative treatment system for the aged landfill leachate, which has the advantages of simple structure, clear layers, high working efficiency and convenient use.
In order to achieve the above object, the technical solution of the present invention is as follows.
The invention relates to a full-quantization treatment process for aged landfill leachate, which is characterized by comprising the following steps of:
s1: the pretreatment system carries out pretreatment: removing suspension and large-particle pollutants in aged landfill leachate by filtering;
s2: the biochemical treatment system carries out biochemical treatment: the aged landfill leachate after pretreatment enters a biochemical treatment system to remove most of COD and most of nitrogenous pollutants;
s3: the ultrafiltration treatment system carries out ultrafiltration treatment: the mixed liquid treated by the biochemical treatment system enters an ultrafiltration treatment system to obtain ultrafiltration clear liquid, and the sludge mixed liquid in the ultrafiltration treatment system flows back to the biochemical treatment system, so that the concentration of sludge in a biochemical pool can be kept at a certain level, and the treatment capacity of the biochemical treatment system on leachate is ensured;
s4: the high-pressure pipe network type reverse osmosis treatment system carries out reverse osmosis treatment: the ultrafiltration clear liquid enters a high-pressure disc tube type reverse osmosis system to obtain primary clear liquid and trapped concentrated liquid, and the primary clear liquid can be discharged after reaching the standard;
s5: the evaporation treatment system carries out evaporation treatment: evaporating the trapped concentrated solution to obtain salt mud and secondary clear liquid;
the biochemical treatment system comprises a nitrosation-anaerobic ammonia oxidation integrated bioreactor, the pH of the nitrosation-anaerobic ammonia oxidation integrated bioreactor is controlled to be 7.5-8.5, the dissolved oxygen is controlled to be 0.3-0.5mg/L, the HRT is controlled to be 24-30h, biochemical fillers are arranged in the nitrosation-anaerobic ammonia oxidation integrated bioreactor, and the volume fraction of the biochemical fillers is 40%. The efficient denitrification function of the aged leachate is realized through the arrangement of nitrosation-anaerobic ammonia, and compared with the prior art, the aged leachate does not need an additional organic carbon source, so that the carbon source and the power consumption are saved. By setting the volume fraction of the biochemical filler to 40%, the biochemical reaction is ensured to be thorough, and materials are not wasted so as to generate new waste.
Further, a temperature sensor, a pH electrode, an ORP electrode and a Dissolved Oxygen (DO) electrode are arranged in the nitrosation-anaerobic ammonia oxidation integrated bioreactor, and the temperature sensor, the pH electrode, the ORP electrode and the Dissolved Oxygen (DO) electrode are all arranged in the nitrosation-anaerobic ammonia oxidation integrated bioreactor and are all electrically connected with a control system. The leachate can be regulated and controlled by arranging a temperature sensor, a pH electrode, an ORP electrode and a Dissolved Oxygen (DO) electrode, so that a better purification and filtration effect is achieved.
The invention relates to a full-quantitative treatment system for aged landfill leachate, which is characterized by comprising
A pretreatment system: removing suspension and large-particle pollutants in aged landfill leachate by filtering;
a biochemical treatment system: the aged landfill leachate after pretreatment enters a biochemical treatment system to remove most of COD and most of nitrogenous pollutants;
an ultrafiltration treatment system: the mixed liquid treated by the biochemical treatment system enters an ultrafiltration treatment system to obtain ultrafiltration clear liquid, and the sludge mixed liquid in the ultrafiltration membrane tank flows back to the biochemical treatment system to keep the sludge concentration in the biochemical treatment tank at a certain level, so that the treatment capacity of the biochemical treatment system on the leachate is ensured;
high-pressure pipe network type reverse osmosis treatment system: the clear solution after ultrafiltration enters a high-pressure disc tube type reverse osmosis membrane system to obtain primary clear solution and trapped concentrated solution, and the primary clear solution can be discharged after reaching the standard;
an evaporation treatment system: evaporating the trapped concentrated solution to obtain salt mud and secondary clear liquid;
the biochemical treatment system comprises a nitrosation-anaerobic ammonia oxidation integrated bioreactor, the pH of the nitrosation-anaerobic ammonia oxidation integrated bioreactor is controlled to be 7.5-8.5, the dissolved oxygen is controlled to be 0.3-0.5mg/L, the HRT is controlled to be 24-30h, biochemical fillers are arranged in the nitrosation-anaerobic ammonia oxidation integrated bioreactor, and the volume fraction of the biochemical fillers is 40%; the efficient denitrification function of the aged leachate is realized through the arrangement of nitrosation-anaerobic ammonia, and compared with the prior art, the aged leachate does not need an additional organic carbon source, so that the carbon source and the power consumption are saved. By setting the volume fraction of the biochemical filler to 40%, the biochemical reaction is ensured to be thorough, and materials are not wasted so as to generate new waste.
The system also comprises a control system, wherein the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system are all in communication connection with the control system. Through the arrangement of the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system, the multi-layer purification and filtration treatment of the aged percolate is realized. Through the setting of the control system, the running states of the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system are displayed in a human-computer interaction interface through the control system, the control system regulates and controls all the systems in real time through a preset program, so that the whole filtration and purification process is stable in running, the discharge of zero concentrated solution is realized, the problem of continuous accumulation of salt in the water quality of aged landfill leachate caused by the recharging of the concentrated solution is thoroughly solved, and the full-quantitative treatment of the aged landfill leachate is realized.
Furthermore, the biochemical treatment system also comprises an aeration system, a dosing control system and a hydraulic circulating stirring system, wherein the aeration system, the dosing control system and the hydraulic circulating stirring system are all in communication connection with the control system. The setting of the aeration system can freely regulate and control the concentration of dissolved oxygen in the biochemical treatment system. The medicine feeding control system is convenient for the injection of the medicine. The arrangement of the hydraulic stirring circulating system ensures the equilibrium of the concentration of pollutants in the biochemical treatment system.
Furthermore, the control system comprises a PLC control system, and the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system are all in communication connection with the PLC control system. The PLC control system is convenient to realize the unified control and scheduling of the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system.
Further, the ultrafiltration treatment system comprises an ultrafiltration membrane pool, a PTFE ultrafiltration membrane is arranged in the ultrafiltration membrane pool, and the PTFE ultrafiltration membrane is arranged in the ultrafiltration treatment system membrane pool. The filtering of the percolate is realized through the arrangement of the PTFE ultrafiltration membrane, the PTFE ultrafiltration membrane is fixed in a membrane pool of an ultrafiltration treatment system in an immersed mode, and the PTFE ultrafiltration membrane is washed by aeration, so that the filtering effect of the PTFE ultrafiltration membrane is better, and the stability of the ultrafiltration treatment system is ensured.
Furthermore, the running flux of the PTFE ultrafiltration membrane is 10-15L per square meter, the running transmembrane pressure difference is 10-50Kpa, and the ultrafiltration sludge mixed liquor in the ultrafiltration membrane pool flows back to the biochemical treatment system. The operating flux of the PTFE ultrafiltration membrane is set to be 10-15L/square meter, and the operating transmembrane pressure difference is 10-50Kpa, so that the PTFE ultrafiltration membrane can meet the requirements of large flow rate and pressure, and the stability of the structure of the ultrafiltration treatment system is ensured. The ultrafiltration sludge mixed liquor is returned to the biochemical treatment system, so that the sludge concentration in the biochemical treatment tank can be kept at a certain level, and the treatment capacity of the biochemical treatment system on the leachate is ensured.
Further, the ultrafiltration processing system still includes sludge discharge system, sludge discharge system includes mud delivery pipe and concentrated pond, the concentrated pond front end is passed through mud delivery pipe and is communicate with the ultrafiltration membrane pond, the concentrated pond rear end is equipped with sludge dewatering system, the concentrated pond passes through sludge dewatering system and biochemical treatment system intercommunication. Wherein, after the concentrated sludge is treated by the sludge dewatering system, the supernatant liquid of the concentrated sludge flows back to the biochemical treatment system.
Further, the high-pressure pipe network type reverse osmosis treatment system comprises an OCRO membrane, the water inlet pressure of the OCRO membrane is 70-90bar, and the OCRO membrane is arranged in two stages. The full and thorough treatment of the aged percolate is ensured by setting the OCRO membrane system into two stages. The OCRO membrane has a wider flow channel, so that pollution blockage is prevented in the filtering process, and the stability of the operation process is ensured.
Further, the evaporation treatment system is provided with a centrifugal dehydration system and an advanced treatment system, the centrifugal dehydration system carries out centrifugal concentration on supersaturated strong brine generated by evaporation to generate crystallized salt and secondary clear liquid, and the secondary clear liquid flows back to the advanced treatment system to be treated again to obtain standard-reaching discharge liquid. The evaporation and crystallization function of intercepting the concentrated solution is realized through the arrangement of the evaporation treatment system, wherein the secondary clear liquid is fully and thoroughly purified and filtered after passing through the advanced treatment system, and the secondary clear liquid can be discharged after reaching the standard.
In conclusion, the high-efficiency denitrification function of the aged leachate is realized through the arrangement of nitrosation-anaerobic ammonia, and compared with the prior art, the method does not need an additional organic carbon source, so that the carbon source and the power consumption are saved. By setting the volume fraction of the biochemical filler to 40%, the biochemical reaction is ensured to be thorough, and materials are not wasted so as to generate new waste. The process also comprises a control system, wherein the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure disc tube type reverse osmosis (OCRO) membrane treatment system and the evaporation treatment system are all in communication connection with the control system. Through the arrangement of a pretreatment system, a biochemical treatment system, an ultrafiltration treatment system, a high-pressure disc tube type reverse osmosis (OCRO) treatment system and an evaporation treatment system, the multi-layer purification and filtration treatment of the aged percolate is realized. Through the setting of control system to through control system with the operating condition display of pretreatment systems, biochemical treatment system, ultrafiltration processing system, high-pressure dish tubular reverse osmosis (OCRO membrane) processing system and evaporation processing system in man-machine interaction interface, control system carries out real-time regulation and control to each system through presetting the procedure, make whole filtration purification process operation stable, realized the discharge of zero concentrate, thoroughly eradicated the concentrate and refilled the problem that leads to the continuous accumulation of ageing landfill rubbish filtration liquid quality salinity, realized the full-scale processing of ageing landfill filtration liquid.
Drawings
FIG. 1 is a flow chart of the full-scale treatment process of leachate in an aging landfill.
Fig. 2 is a flow chart of the aging refuse landfill leachate full-quantization treatment system of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to achieve the above object, the technical solution of the present invention is as follows.
Referring to fig. 1, the invention is a full-quantization treatment process of aged landfill leachate, which comprises the following steps:
s1: the pretreatment system carries out pretreatment: removing suspension and large-particle pollutants in aged landfill leachate by filtering;
s2: the biochemical treatment system carries out biochemical treatment: the aged landfill leachate after pretreatment enters a biochemical treatment system to remove most of COD and most of nitrogenous pollutants;
s3: the ultrafiltration treatment system carries out ultrafiltration treatment: the mixed liquid treated by the biochemical treatment system enters an ultrafiltration treatment system to obtain ultrafiltration clear liquid, and the sludge mixed liquid in the ultrafiltration treatment system flows back to the biochemical treatment system, so that the concentration of sludge in a biochemical pool can be kept at a certain level, and the treatment capacity of the biochemical treatment system on leachate is ensured;
s4: the high-pressure pipe network type reverse osmosis treatment system carries out reverse osmosis treatment: the ultrafiltration clear liquid enters a high-pressure disc tube type reverse osmosis system to obtain primary clear liquid and trapped concentrated liquid, and the primary clear liquid can be discharged after reaching the standard;
s5: the evaporation treatment system carries out evaporation treatment: evaporating the trapped concentrated solution to obtain salt mud and secondary clear liquid;
the biochemical treatment system comprises a nitrosation-anaerobic ammonia oxidation integrated bioreactor, the pH of the nitrosation-anaerobic ammonia oxidation integrated bioreactor is controlled to be 7.5-8.5, the dissolved oxygen is controlled to be 0.3-0.5mg/L, the HRT is controlled to be 24-30h, biochemical fillers are arranged in the nitrosation-anaerobic ammonia oxidation integrated bioreactor, and the volume fraction of the biochemical fillers is 40%. The efficient denitrification function of the aged leachate is realized through the arrangement of nitrosation-anaerobic ammonia, and compared with the prior art, the aged leachate does not need an additional organic carbon source, so that the carbon source and the power consumption are saved. By setting the volume fraction of the biochemical filler to 40%, the biochemical reaction is ensured to be thorough, and materials are not wasted so as to generate new waste.
In the embodiment, a temperature sensor, a pH electrode, an ORP electrode and a Dissolved Oxygen (DO) electrode are arranged in the nitrosation-anammox integrated bioreactor, and the temperature sensor, the pH electrode, the ORP electrode and the Dissolved Oxygen (DO) electrode are all arranged in the nitrosation-anammox integrated bioreactor and are all electrically connected with a control system. The leachate can be regulated and controlled by arranging a temperature sensor, a pH electrode, an ORP electrode and a Dissolved Oxygen (DO) electrode, so that a better purification and filtration effect is achieved.
Referring to fig. 2, the invention relates to a full-quantitative treatment system for aged refuse landfill leachate, which comprises
A pretreatment system: removing suspension and large-particle pollutants in aged landfill leachate by filtering;
a biochemical treatment system: the aged landfill leachate after pretreatment enters a biochemical treatment system to remove most of COD and most of nitrogenous pollutants;
an ultrafiltration treatment system: the mixed liquid treated by the biochemical treatment system enters an ultrafiltration treatment system to obtain ultrafiltration clear liquid, and the sludge mixed liquid in the ultrafiltration membrane tank flows back to the biochemical treatment system to keep the sludge concentration in the biochemical treatment tank at a certain level, so that the treatment capacity of the biochemical treatment system on the leachate is ensured;
high-pressure pipe network type reverse osmosis treatment system: the clear solution after ultrafiltration enters a high-pressure disc tube type reverse osmosis membrane system to obtain primary clear solution and trapped concentrated solution, and the primary clear solution can be discharged after reaching the standard;
an evaporation treatment system: evaporating the trapped concentrated solution to obtain salt mud and secondary clear liquid;
the biochemical treatment system comprises a nitrosation-anaerobic ammonia oxidation integrated bioreactor, the pH of the nitrosation-anaerobic ammonia oxidation integrated bioreactor is controlled to be 7.5-8.5, the dissolved oxygen is controlled to be 0.3-0.5mg/L, the HRT is controlled to be 24-30h, biochemical fillers are arranged in the nitrosation-anaerobic ammonia oxidation integrated bioreactor, and the volume fraction of the biochemical fillers is 40%; the efficient denitrification function of the aged leachate is realized through the arrangement of nitrosation-anaerobic ammonia, and compared with the prior art, the aged leachate does not need an additional organic carbon source, so that the carbon source and the power consumption are saved. By setting the volume fraction of the biochemical filler to 40%, the biochemical reaction is ensured to be thorough, and materials are not wasted so as to generate new waste.
The system also comprises a control system, wherein the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system are all in communication connection with the control system. Through the arrangement of the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system, the multi-layer purification and filtration treatment of the aged percolate is realized. Through the setting of the control system, the running states of the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system are displayed in a human-computer interaction interface through the control system, the control system regulates and controls all the systems in real time through a preset program, so that the whole filtration and purification process is stable in running, the discharge of zero concentrated solution is realized, the problem of continuous accumulation of salt in the water quality of aged landfill leachate caused by the recharging of the concentrated solution is thoroughly solved, and the full-quantitative treatment of the aged landfill leachate is realized.
In this embodiment, the biochemical treatment system further comprises an aeration system, a dosing control system and a hydraulic circulating stirring system, and the aeration system, the dosing control system and the hydraulic circulating stirring system are all in communication connection with the control system. The setting of the aeration system can freely regulate and control the concentration of dissolved oxygen in the biochemical treatment system. The medicine feeding control system is convenient for the injection of the medicine. The arrangement of the hydraulic stirring circulating system ensures the equilibrium of the concentration of pollutants in the biochemical treatment system.
In this embodiment, the control system includes a PLC control system, and the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system, and the evaporation treatment system are all connected to the PLC control system in a communication manner. The PLC control system is convenient to realize the unified control and scheduling of the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system.
In this embodiment, the ultrafiltration processing system includes the ultrafiltration membrane pond, be provided with the PTFE milipore filter in the milipore filter pond, the PTFE milipore filter sets up in the milipore filter pond of ultrafiltration processing system. The filtering of the percolate is realized through the arrangement of the PTFE ultrafiltration membrane, the PTFE ultrafiltration membrane is fixed in a membrane pool of an ultrafiltration treatment system in an immersed mode, and the PTFE ultrafiltration membrane is washed by aeration, so that the filtering effect of the PTFE ultrafiltration membrane is better, and the stability of the ultrafiltration treatment system is ensured.
In the embodiment, the operating flux of the PTFE ultrafiltration membrane is 10-15L per square meter, the operating transmembrane pressure difference is 10-50Kpa, and the ultrafiltration sludge mixed liquor in the ultrafiltration membrane pool flows back to the biochemical treatment system. The operating flux of the PTFE ultrafiltration membrane is set to be 10-15L/square meter, and the operating transmembrane pressure difference is 10-50Kpa, so that the PTFE ultrafiltration membrane can meet the requirements of large flow rate and pressure, and the stability of the structure of the ultrafiltration treatment system is ensured. The ultrafiltration sludge mixed liquor is returned to the biochemical treatment system, so that the sludge concentration in the biochemical treatment tank can be kept at a certain level, and the treatment capacity of the biochemical treatment system on the leachate is ensured.
In this embodiment, the ultrafiltration processing system still includes sludge discharge system, sludge discharge system includes mud discharge pipe and concentrated pond, the concentrated pond front end is passed through mud discharge pipe and is communicated with the ultrafiltration membrane pond, the concentrated pond rear end is equipped with sludge dewatering system, the concentrated pond passes through sludge dewatering system and biochemical treatment system intercommunication. Wherein, after the concentrated sludge is treated by the sludge dewatering system, the supernatant liquid of the concentrated sludge flows back to the biochemical treatment system.
In the embodiment, the high-pressure pipe network type reverse osmosis treatment system comprises an OCRO membrane, the water inlet pressure of the OCRO membrane is 70-90bar, and the OCRO membrane is arranged in two stages. The full and thorough treatment of the aged percolate is ensured by setting the OCRO membrane system into two stages. The OCRO membrane has a wider flow channel, so that pollution blockage is prevented in the filtering process, and the stability of the operation process is ensured.
In this embodiment, the evaporation processing system is equipped with centrifugal dehydration system and advanced treatment system, centrifugal dehydration system carries out centrifugal concentration to evaporating the strong brine that produces the supersaturation, generates crystal salt and secondary clear liquid, and this secondary clear liquid flows back to advanced treatment system and carries out retreatment, obtains discharge up to standard. The evaporation and crystallization function of intercepting the concentrated solution is realized through the arrangement of the evaporation treatment system, wherein the secondary clear liquid is fully and thoroughly purified and filtered after passing through the advanced treatment system, and the secondary clear liquid can be discharged after reaching the standard.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The full-quantization treatment process of the aged landfill leachate is characterized by comprising the following steps of:
s1: the pretreatment system carries out pretreatment: removing suspension and large-particle pollutants in aged landfill leachate by filtering;
s2: the biochemical treatment system carries out biochemical treatment: the aged landfill leachate after pretreatment enters a biochemical treatment system to remove most of COD and most of nitrogenous pollutants;
s3: the ultrafiltration treatment system carries out ultrafiltration treatment: the mixed liquid treated by the biochemical treatment system enters an ultrafiltration treatment system to obtain ultrafiltration clear liquid, and the sludge mixed liquid in the ultrafiltration treatment system flows back to the biochemical treatment system;
s4: the high-pressure pipe network type reverse osmosis treatment system carries out reverse osmosis treatment: the ultrafiltration clear liquid enters a high-pressure disc tube type reverse osmosis system to obtain primary clear liquid and trapped concentrated liquid, and the primary clear liquid can be discharged after reaching the standard;
s5: the evaporation treatment system carries out evaporation treatment: evaporating the trapped concentrated solution to obtain salt mud and secondary clear liquid;
the biochemical treatment system comprises a nitrosation-anaerobic ammonia oxidation integrated bioreactor, the pH of the nitrosation-anaerobic ammonia oxidation integrated bioreactor is controlled to be 7.5-8.5, the dissolved oxygen is controlled to be 0.3-0.5mg/L, the HRT is controlled to be 24-30h, biochemical fillers are arranged in the nitrosation-anaerobic ammonia oxidation integrated bioreactor, and the volume fraction of the biochemical fillers is 40%.
2. The fully quantitative treatment process of leachate from an aging refuse landfill according to claim 1, wherein the nitrosation-anammox integrated bioreactor is provided with a temperature sensor, a pH electrode, an ORP electrode and a Dissolved Oxygen (DO) electrode, and the temperature sensor, the pH electrode, the ORP electrode and the Dissolved Oxygen (DO) electrode are all arranged inside the nitrosation-anammox integrated bioreactor and are all electrically connected with the control system.
3. A full-quantitative treatment system for aged landfill leachate is characterized by comprising
A pretreatment system: filtering to remove suspension and large-particle pollutants in the aged landfill leachate;
a biochemical treatment system: removing most of COD and most of nitrogenous pollutants in the aged landfill leachate after pretreatment;
an ultrafiltration treatment system: treating the mixed liquid treated by the biochemical treatment system to obtain ultrafiltration clear liquid;
high-pressure pipe network type reverse osmosis treatment system: treating the ultrafiltration clear liquid to obtain a primary clear liquid and an interception concentrated liquid;
an evaporation treatment system: evaporating the trapped concentrated solution to obtain salt mud and secondary clear liquid;
the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system are sequentially connected;
the biochemical treatment system comprises a nitrosation-anaerobic ammonia oxidation integrated bioreactor, wherein the pH value of the nitrosation-anaerobic ammonia oxidation integrated bioreactor is controlled to be 7.5-8.5, the dissolved oxygen is controlled to be 0.3-0.5mg/L, and the HRT is controlled to be 24-30 h; the nitrosation-anaerobic ammonia oxidation integrated bioreactor is internally provided with biochemical fillers, and the volume fraction of the biochemical fillers is 40%;
the system also comprises a control system, wherein the pretreatment system, the biochemical treatment system, the ultrafiltration treatment system, the high-pressure pipe network type reverse osmosis treatment system and the evaporation treatment system are all in communication connection with the control system.
4. The system for the full-scale treatment of leachate in an aged refuse landfill of claim 3, wherein the biochemical treatment system further comprises an aeration system, a chemical-adding control system and a hydraulic circulating stirring system, and the aeration system, the chemical-adding control system and the hydraulic circulating stirring system are all in communication connection with the control system.
5. The system of claim 4, wherein the control system comprises a PLC control system, and the pre-treatment system, the biochemical treatment system, the ultrafiltration treatment system, the high pressure pipe network reverse osmosis treatment system and the evaporation treatment system are all in communication connection with the PLC control system.
6. The system for fully treating leachate of an aging refuse landfill as claimed in claim 3, wherein the ultrafiltration treatment system comprises an ultrafiltration membrane tank, a PTFE ultrafiltration membrane is arranged in the ultrafiltration membrane tank, and the PTFE ultrafiltration membrane is arranged in the ultrafiltration membrane tank in an immersed manner.
7. The system for fully quantitatively treating percolate of an aged refuse landfill claim 6, wherein the operating flux of the PTFE ultrafiltration membrane is 10 to 15L per square meter, the operating transmembrane pressure difference is 10 to 50Kpa, and the sludge mixed liquor in the ultrafiltration membrane tank flows back to the biochemical treatment system.
8. The system for the full-scale treatment of leachate in the aged refuse landfill of claim 6, wherein the ultrafiltration treatment system further comprises a sludge discharge system, the sludge discharge system comprises a sludge discharge pipe and a concentration tank, the front end of the concentration tank is communicated with the ultrafiltration membrane tank through the sludge discharge pipe, the rear end of the concentration tank is provided with a sludge dewatering system, and the concentration tank is communicated with the biochemical treatment system through the sludge dewatering system.
9. The system for the full-scale treatment of percolate from an aging refuse landfill according to claim 3, wherein the high-pressure pipe network type reverse osmosis treatment system comprises an OCRO membrane, the water inlet pressure of the OCRO membrane is 70-90bar, and the OCRO membrane is arranged in two stages.
10. The system of claim 3, wherein the evaporation treatment system comprises a centrifugal dehydration system and a deep treatment system, the centrifugal dehydration system performs centrifugal concentration on supersaturated concentrated brine generated by evaporation to generate crystallized salt and secondary clear liquid, and the secondary clear liquid flows back to the deep treatment system for re-treatment to obtain the discharge liquid meeting the standard.
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