CN112110596A - Zero-discharge treatment method for landfill leachate - Google Patents

Zero-discharge treatment method for landfill leachate Download PDF

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Publication number
CN112110596A
CN112110596A CN202011124479.1A CN202011124479A CN112110596A CN 112110596 A CN112110596 A CN 112110596A CN 202011124479 A CN202011124479 A CN 202011124479A CN 112110596 A CN112110596 A CN 112110596A
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China
Prior art keywords
landfill leachate
evaporation
zero
treatment method
heat
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Pending
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CN202011124479.1A
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Chinese (zh)
Inventor
孟祥雷
杜学谦
王金豹
史宗方
吕勃锋
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Beijing Jinghang Environmental Technology Co ltd
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Beijing Jinghang Environmental Technology Co ltd
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Priority to CN202011124479.1A priority Critical patent/CN112110596A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • 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
    • C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
    • 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
    • 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
    • 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
    • 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

Abstract

A zero-emission treatment method for landfill leachate comprises the following steps: step S10: treating the landfill leachate by adopting disc tube type reverse osmosis; step S20: preheating the treated landfill leachate; step S30: evaporating the preheated landfill leachate; step S40: and (4) carbonizing and pyrolyzing the evaporated landfill leachate, and applying the heat of the flue gas discharged by carbonization and pyrolysis to the evaporation of the landfill leachate in the step S30. The disc tube type reverse osmosis is adopted, the pretreatment is not depended on, and the stability, the safety and the comfort are good; the preheated landfill leachate is evaporated, so that the landfill leachate can be further concentrated, the quantity of the landfill leachate is reduced, and continuous and stable operation of equipment is ensured; through the processing of carbonization pyrolysis, realize landfill leachate's zero release and handle, the flue gas after the carbonization pyrolysis is used for providing the heat source for landfill leachate, has improved the utilization ratio of the energy, indirect reduce the cost.

Description

Zero-discharge treatment method for landfill leachate
Technical Field
The invention relates to the field of landfill leachate treatment, in particular to a zero-discharge treatment method for landfill leachate.
Background
The landfill leachate is complex organic wastewater and is characterized by high concentration of organic matters, complex components, high concentration of ammonia nitrogen and poor biodegradability. The landfill leachate has large variation range along with seasons, complex variation rule and large treatment difficulty.
The existing treatment technologies of the landfill leachate mainly comprise a physicochemical treatment technology, an advanced oxidation technology, a membrane separation technology, a biological treatment technology and the like. The typical representative process is a combined process of 'Membrane Bioreactor (MBR) + double-membrane method (NF/RO)', effluent reaches the standard and is discharged outside, and corresponding membrane concentrated solution is refilled to a landfill reservoir area.
In the prior art, the generated membrane concentrated solution needs to be recharged to a landfill area, and zero emission in a real sense cannot be realized. The accumulation of salt and COD in the pile body is caused by the long-term recharging of the membrane concentrated solution, the enriched salt can form scale in a percolate collecting pipeline of the landfill and continuously attach microorganisms, and the diversion pipe of the whole landfill can be blocked and scrapped in serious cases; meanwhile, the conductivity of the leachate is obviously increased due to the enriched salt, the water yield of the membrane is reduced, the membrane filtration is disabled even due to the overhigh conductivity, and the quality of the effluent is difficult to reach the standard.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a zero-emission treatment method for landfill leachate so as to realize zero emission of the landfill leachate.
A zero-emission treatment method for landfill leachate comprises the following steps: step S10: treating the landfill leachate by adopting disc tube type reverse osmosis; step S20: preheating the treated landfill leachate; step S30: evaporating the preheated landfill leachate; step S40: and (4) carbonizing and pyrolyzing the evaporated landfill leachate, and applying the heat of the flue gas discharged by carbonization and pyrolysis to the evaporation of the landfill leachate in the step S30.
Further, step S30 includes: step S31: carrying out primary evaporation on the landfill leachate by adopting heat conduction oil; step S32: and (4) carrying out secondary evaporation on the landfill leachate after the primary evaporation by using the steam after the primary evaporation.
Further, in step S31, the temperature of the heat conducting oil entering the evaporator is H, wherein H is more than or equal to 170 ℃ and less than or equal to 210 ℃.
Further, in step S31, the evaporation amount of the first evaporation is controlled to be 70% to 80%, and in step S32, the evaporation amount of the second evaporation is controlled to be 20% to 30%.
Further, step S30 further includes: step S33: condensing the steam after the second evaporation through a condenser; step S34: and discharging the condensed water.
Further, in step S40, the flue gas discharged from the carbonization and pyrolysis is used to heat the heat transfer oil in step S31.
Further, in step S40, the heat of the flue gas evaporated in step S30 is used to preheat the landfill leachate in step S20.
Further, the flue gas used for preheating the landfill leachate in the step S20 is subjected to tail gas treatment.
The zero-discharge treatment method for the landfill leachate has the following technical effects:
firstly, disc tube type reverse osmosis is adopted, pretreatment is not needed, and the device has good stability, safety and comfort; the preheated landfill leachate is evaporated, so that the landfill leachate can be further concentrated, the quantity of the landfill leachate is reduced, and continuous and stable operation of equipment is ensured; through the processing of carbonization pyrolysis, realize landfill leachate's zero release and handle, the flue gas after the carbonization pyrolysis is used for providing the heat source for landfill leachate, has improved the utilization ratio of the energy, indirect reduce the cost.
And secondly, evaporating the landfill leachate twice, so that the evaporation capacity can be improved, the landfill leachate is further concentrated, and meanwhile, the residual steam of the first evaporation is utilized in the second evaporation, so that the utilization rate of a heat source is improved, and the cost is reduced.
Thirdly, after the heat is transferred to the heat conduction oil by the flue gas, the temperature of the flue gas can be reduced, and the filtered landfill leachate is preheated by utilizing the low-temperature flue gas, so that the heat energy is fully recycled.
Drawings
FIG. 1 is a schematic diagram of the steps of the zero-discharge treatment method of landfill leachate of the present invention;
FIG. 2 is a schematic diagram of step S30 in FIG. 1;
FIG. 3 is a schematic flow diagram of the zero-discharge treatment method of landfill leachate of the present invention.
Detailed Description
To clearly illustrate the idea of the present invention, the present invention is described below with reference to examples.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention is described clearly and completely below with reference to the drawings in the examples of the present invention, and it is obvious that the described examples are only a part of examples of the present invention, and not all examples. All other embodiments obtained by a person skilled in the art based on examples of the present invention without inventive step shall fall within the scope of protection of the present invention.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish similar items and are not to be construed as requiring a particular order or sequence, and it is to be understood that such uses are interchangeable under appropriate circumstances.
The invention provides a zero-emission treatment method for landfill leachate, which is used for realizing zero emission of the landfill leachate.
As shown in figures 1 to 3, the zero-emission treatment method of the landfill leachate comprises the following steps
Step S10: treating the landfill leachate by adopting disc tube type reverse osmosis;
step S20: preheating the treated landfill leachate;
step S30: evaporating the preheated landfill leachate;
step S40: and (4) carbonizing and pyrolyzing the evaporated landfill leachate, and applying the heat of the flue gas discharged by carbonization and pyrolysis to the evaporation of the landfill leachate in the step S30.
In the embodiment, the disc tube type reverse osmosis is adopted, pretreatment is not needed, and the disc tube type reverse osmosis has good stability, safety and comfort; the preheated landfill leachate is evaporated, so that the landfill leachate can be further concentrated, the quantity of the landfill leachate is reduced, and continuous and stable operation of equipment is ensured; through the processing of carbonization pyrolysis, realize landfill leachate's zero release and handle, the flue gas after the carbonization pyrolysis is used for providing the heat source for landfill leachate, has improved the utilization ratio of the energy, indirect reduce the cost.
As shown in fig. 2, step S30 includes:
step S31: carrying out primary evaporation on the landfill leachate by adopting heat conduction oil;
step S32: and (4) carrying out secondary evaporation on the landfill leachate after the primary evaporation by using the steam after the primary evaporation.
In step S31, the temperature of the heat conducting oil entering the evaporator is H, wherein H is more than or equal to 170 ℃ and less than or equal to 210 ℃. The evaporation amount of the first evaporation is controlled to be 70% to 80%, and in step S32, the evaporation amount of the second evaporation is controlled to be 20% to 30%.
In this example, the evaporation amount of the first evaporation was controlled to be about 75%, and the evaporation amount of the second evaporation was controlled to be 25%. Considering that the heat of the heat conducting oil is provided by the smoke of the carbonization and pyrolysis of the garbage, the temperature of the heat conducting oil is controlled to be 170-210 ℃.
As shown in fig. 2, step S30 further includes:
step S33: condensing the steam after the second evaporation through a condenser; step S34: and discharging the condensed water. As shown in fig. 2 and 3, the evaporator needs to be cleaned regularly to reduce the influence of scaling on the evaporation efficiency and stable operation of the evaporator.
As shown in fig. 3, in step S40, the flue gas discharged from the carbonization and pyrolysis is used to heat the heat transfer oil in step S31. The heat conduction oil provides a heat source for the evaporation of the landfill leachate, the smoke after carbonization and pyrolysis provides heat for the heat conduction oil, and the heat conduction oil and the smoke circularly replace heat through the heat exchanger. And after the heat is transferred to the evaporator through the circulating pump for heat exchange, the low-temperature heat conducting oil returns to the heat exchanger for recycling.
As shown in fig. 3, in step S40, the heat of the flue gas evaporated in step S30 is used to preheat the landfill leachate in step S20, and the treated flue gas is treated with tail gas. After the flue gas gives the conduction oil with heat transfer, the temperature of flue gas can reduce, utilizes microthermal flue gas to preheat the landfill leachate after filtering this moment, fully retrieves heat energy. The tail gas treatment is to the flue gas that pyrolysis gas, natural gas burning produced handles to through setting up spray washing, active carbon adsorption, draught fan, chimney etc. to realize that the tail gas is up to standard to arrange outward.
As shown in FIG. 3, a multi-chamber, fixed bed, continuous complete set of equipment for carbonization and pyrolysis of garbage is used for carbonization and pyrolysis. The concentrated solution after evaporation decrement is mixed with the household garbage according to a certain proportion, and the mixture is subjected to anaerobic high-temperature carbonization pyrolysis in a carbonization pyrolysis device. The flue gas after carbonization and pyrolysis is recovered to provide a heat source for evaporation of the landfill leachate; the pyrolytic carbon can be used as a tail gas treatment adsorbent or sold as a commodity.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Finally, it is to be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not intended to be limiting. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as within the scope of the invention.

Claims (8)

1. A zero-emission treatment method for landfill leachate is characterized by comprising the following steps:
step S10: treating the landfill leachate by adopting disc tube type reverse osmosis;
step S20: preheating the treated landfill leachate;
step S30: evaporating the preheated landfill leachate;
step S40: and (4) carbonizing and pyrolyzing the evaporated landfill leachate, and applying the heat of the flue gas discharged by carbonization and pyrolysis to the evaporation of the landfill leachate in the step S30.
2. The zero-emission treatment method for landfill leachate according to claim 1, wherein the step S30 comprises:
step S31: carrying out primary evaporation on the landfill leachate by adopting heat conduction oil;
step S32: and (4) carrying out secondary evaporation on the landfill leachate after the primary evaporation by using the steam after the primary evaporation.
3. The zero-emission treatment method for landfill leachate according to claim 2, wherein in the step S31, the temperature of the heat conducting oil entering the evaporator is H, and H is greater than or equal to 170 ℃ and less than or equal to 210 ℃.
4. The zero-emission treatment method of landfill leachate according to claim 2, wherein in step S31, the evaporation rate of the first evaporation is controlled to be 70% to 80%, and in step S32, the evaporation rate of the second evaporation is controlled to be 20% to 30%.
5. The zero-emission treatment method for landfill leachate according to claim 2, wherein the step S30 further comprises:
step S33: condensing the steam after the second evaporation through a condenser;
step S34: and discharging the condensed water.
6. The zero emission treatment method for landfill leachate according to claim 2, wherein in step S40, the flue gas discharged from the carbonization and pyrolysis is used to heat the heat conducting oil in step S31.
7. The zero-emission treatment method for landfill leachate according to claim 1, wherein in step S40, the heat of the flue gas evaporated in step S30 is used to preheat landfill leachate in step S20.
8. The zero-emission treatment method for landfill leachate according to claim 7, wherein the flue gas after preheating treatment of landfill leachate in step S20 is treated with tail gas.
CN202011124479.1A 2020-10-20 2020-10-20 Zero-discharge treatment method for landfill leachate Pending CN112110596A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104496103A (en) * 2014-12-23 2015-04-08 北京桑德环境工程有限公司 Method for treating landfill leachate concentrated liquid
CN105859009A (en) * 2016-06-02 2016-08-17 北京神雾环境能源科技集团股份有限公司 Treatment system and method for landfill leachate
US20170107478A1 (en) * 2015-06-10 2017-04-20 Kevin C. Harmon System and method for biomass growth and processing
CN106635074A (en) * 2016-10-14 2017-05-10 北京神雾环境能源科技集团股份有限公司 Domestic waste recycling system and method
CN109836020A (en) * 2019-04-04 2019-06-04 北京高能时代环境技术股份有限公司 A kind of processing system and method for mature landfill leachate zero-emission

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104496103A (en) * 2014-12-23 2015-04-08 北京桑德环境工程有限公司 Method for treating landfill leachate concentrated liquid
US20170107478A1 (en) * 2015-06-10 2017-04-20 Kevin C. Harmon System and method for biomass growth and processing
CN105859009A (en) * 2016-06-02 2016-08-17 北京神雾环境能源科技集团股份有限公司 Treatment system and method for landfill leachate
CN106635074A (en) * 2016-10-14 2017-05-10 北京神雾环境能源科技集团股份有限公司 Domestic waste recycling system and method
CN109836020A (en) * 2019-04-04 2019-06-04 北京高能时代环境技术股份有限公司 A kind of processing system and method for mature landfill leachate zero-emission

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Application publication date: 20201222

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