CN111252868A - Resource disposal system and method for landfill leachate membrane filtration concentrated solution - Google Patents
Resource disposal system and method for landfill leachate membrane filtration concentrated solution Download PDFInfo
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- CN111252868A CN111252868A CN202010111935.2A CN202010111935A CN111252868A CN 111252868 A CN111252868 A CN 111252868A CN 202010111935 A CN202010111935 A CN 202010111935A CN 111252868 A CN111252868 A CN 111252868A
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/46115—Electrolytic cell with membranes or diaphragms
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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
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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Abstract
The invention provides a resource disposal system and a disposal method for membrane filtration concentrated solution of landfill leachate, wherein the disposal system comprises: acid circulation circuit, alkali circulation circuit, strong brine circulation circuit and electric drive membrane system, acid circulation circuit includes: acidizing fluid circulating pump and acid storage tank, during electric drive membrane system carried the acidizing fluid to the acid storage tank through the second pipeline, alkali circulation loop included: alkali lye circulating pump and alkali storage tank, alkali lye circulating pump and alkali storage tank are linked together through third pipeline and electric drive membrane system, and electric drive membrane system carries alkali lye to the alkali storage tank in through the fourth pipeline, and strong brine circulation circuit includes: strong brine storage tank, strong brine circulating pump, strong brine storage tank and strong brine circulating pump pass through the fifth pipeline with electric drive membrane system intercommunication, electric drive membrane system communicates strong brine storage tank through sixth pipeline. The invention can dispose the membrane filtration concentrated solution in a more resource mode, replaces the treatment processes of incineration, evaporation and the like, and creates additional value.
Description
Technical Field
The invention relates to a recycling treatment system of landfill leachate membrane filtration concentrated solution, and also relates to a recycling treatment method of the landfill leachate membrane filtration concentrated solution, belonging to the field of garbage treatment.
Background
The landfill leachate generated in the landfill site has complex water quality components, high pollutant concentration, poor biodegradability, difficult degradation, more toxic substances, high content of bacteria, viruses and the like. Must be treated to eliminate pollution and can be discharged. Based on the advantages of relatively low operating cost, high treatment efficiency and good pollutant removal effect of the biological treatment method and the capability of the membrane separation technology to remove inorganic salts, organic matters, colloids, bacteria and other substances in the wastewater, the garbage leachate treatment is usually carried out by adopting a combination form of the biological treatment method and the membrane separation technology (pretreatment + biological treatment + double-membrane method (NF + RO)). After being processed by the membrane separation technology, a certain amount of membrane filtration concentrated solution is generated. The membrane filtration concentrated solution is difficult to treat due to the characteristics of high concentration of organic matters difficult to degrade, poor biodegradability, high content of humic acid and the like. At present, the membrane filtration concentrated solution is usually treated by evaporation concentration or incineration. But both evaporative concentration and incineration have many disadvantages. The evaporation concentration not only has quite large energy consumption, but also is easy to scale, an evaporator is easy to corrode and block, and the evaporated solid crystals still need to be further treated. The salt content of the membrane filtration concentrated solution after incineration is transferred to incineration ash, so that the treatment and utilization difficulty of the incineration ash is greatly increased. If the ash is buried, the soluble salt can enter the percolate again and accelerate the enrichment.
Under the background, a membrane filtration concentrate recycling treatment process and system are needed, which can treat the membrane filtration concentrate in a more energy-saving, environment-friendly and recycling manner.
Disclosure of Invention
The invention aims to provide a resource disposal system and a resource disposal method for membrane filtration concentrated solution of landfill leachate, which can prepare the membrane filtration concentrated solution generated by a landfill leachate treatment system into an acid solution and an alkali solution.
The invention adopts the following technical scheme:
a resource disposal system of landfill leachate membrane filtration concentrate is characterized by comprising: acid circulation circuit, alkali circulation circuit, strong brine circulation circuit and electric drive membrane system, acid circulation circuit includes: acidizing fluid circulating pump and acid storage tank, acidizing fluid circulating pump and acid storage tank are linked together through first pipeline and electric drive membrane system, and electric drive membrane system carries the acidizing fluid to the acid storage tank in through the second pipeline, and alkali circulation loop includes: alkali lye circulating pump and alkali storage tank, alkali lye circulating pump and alkali storage tank are linked together through third pipeline and electric drive membrane system, and electric drive membrane system carries alkali lye to the alkali storage tank in through the fourth pipeline, and strong brine circulation circuit includes: strong brine storage tank, strong brine circulating pump, strong brine storage tank and strong brine circulating pump pass through the fifth pipeline with electric drive membrane system intercommunication, electric drive membrane system communicates strong brine storage tank through sixth pipeline.
The system for recycling landfill leachate membrane filtration concentrate of the present invention is characterized by further comprising: and the acid lift pump is communicated with the acid storage tank through a pipeline and conveys the acid in the acid storage tank out.
The system for recycling landfill leachate membrane filtration concentrate of the present invention is characterized by further comprising: and the alkali lift pump is communicated with the alkali storage tank through a pipeline and conveys out the alkali in the alkali storage tank.
The resource disposal system for the landfill leachate membrane filtration concentrated solution is also characterized in that a flowmeter, a pressure gauge and a conductivity meter are respectively arranged on the acid liquor circulation loop and the alkali liquor circulation loop.
The resource disposal system for the membrane filtration concentrated solution of the landfill leachate is also characterized in that under the dual actions of the electric field action and the anion and cation selection characteristic of the membrane, anions migrate to the anode, cations migrate to the cathode, water is electrolyzed to generate hydrogen ions and hydroxyl ions along with the ion migration, the hydrogen ions form an acid solution with the anions in the concentrated salt water at the anode, the acid solution is discharged to an acid storage tank, and the hydroxyl ions form an alkali solution with the cations in the concentrated salt water at the cathode and are discharged to an alkali storage tank.
The system for recycling landfill leachate membrane filtration concentrate of the present invention is characterized by further comprising: an electrical control system and valves and pipelines necessary for the system.
The invention also provides a resource disposal method of the landfill leachate membrane filtration concentrated solution, which is characterized by comprising the following steps:
firstly, membrane filtration concentrated solution generated by a garbage leachate treatment system is conveyed to a strong brine tank, and strong brine is conveyed to an electric drive membrane system under the action of a strong brine circulating pump;
secondly, the concentrated brine is subjected to the action of an electric field in an electric drive membrane system, anions and cations migrate to the anode, the anions migrate to the cathode, along with the ion migration, water is electrolyzed to generate hydrogen ions and hydroxyl ions, the hydrogen ions form an acid solution with the anions in the concentrated brine at the anode, the acid solution is discharged to an acid storage tank, and the hydroxyl ions form an alkali solution with the cations in the concentrated brine at the cathode and are discharged to an alkali storage tank;
step three, occurring simultaneously with the step two, enabling the acid liquor in the acid storage tank to enter an electric drive membrane system under the action of an acid liquor circulating pump, and enabling anions in concentrated salt water to be gathered in the acid liquor, so that the pH value of the acid liquor is reduced, and the acidity is enhanced;
step four, occurring simultaneously with the step two, the alkali liquor in the alkali storage tank enters the electric drive membrane device through the action of the alkali liquor circulating pump, and cations in the concentrated brine are gathered in the alkali liquor, so that the PH value of the alkali liquor is increased, and the alkalinity is enhanced;
fifthly, when the acid liquor in the acid storage tank reaches the preset concentration, the acid liquor is conveyed to other systems for subsequent treatment under the conveying action of an acid liquor lifting pump;
and step six, when the alkali liquor in the alkali storage tank reaches the preset concentration, conveying the alkali liquor to a biochemical treatment system of the landfill leachate for recycling under the conveying action of an alkali liquor lifting pump.
The invention has the beneficial effects that: the membrane filtration concentrated solution generated by the landfill leachate treatment system can be prepared into an acid solution and an alkali solution. The alkali solution generated by the system can be reused in a landfill leachate biochemical system, and the generated acid solution can be used for other acidification treatments. The application of the treatment process and the system can dispose the membrane filtration concentrated solution in a more resource mode, replace treatment processes such as incineration and evaporation, create added value, generate higher environmental benefit and social benefit, and accord with resource routes of environmental protection and saving environmental protection.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Fig. 2 is a schematic diagram of an electrically driven membrane device.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Example 1
As shown in fig. 1, the system for recycling the membrane filtration concentrate of landfill leachate includes: acid circulation loop, alkali circulation loop, strong brine circulation loop and electric drive membrane system.
The acid circulation loop comprises: an acid liquor circulating pump 14 and an acid storage tank 13, wherein the acid liquor circulating pump 14 and the acid storage tank 13 are communicated with an electrically driven membrane system through a first pipeline 41, and the electrically driven membrane system 15 conveys acid liquor into the acid storage tank 13 through a second pipeline 42.
The caustic recirculation loop comprises: the alkali liquor circulating pump 16 and the alkali storage tank 17 are communicated with the electric drive membrane system 15 through a third pipeline 43, and the electric drive membrane system 15 conveys alkali liquor to the alkali storage tank 17 through a fourth pipeline 44.
The strong brine circulation loop includes: strong brine storage tank 31, strong brine circulating pump 32, strong brine storage tank 31 and strong brine circulating pump 32 through fifth pipeline 45 with the 15 intercommunication of electric drive membrane system, electric drive membrane system 15 is through sixth pipeline 46 intercommunication strong brine storage tank.
The resource disposal system of the landfill leachate membrane filtration concentrated solution also comprises an electrical control system, a flowmeter, a pressure gauge, a conductivity meter, and accessory equipment such as valves, pipelines and the like which are necessary for the system.
The acid storage tank 13 is connected with the acid liquor lift pump 121 through a pipeline, and can convey the acid liquor to the acid treatment device 11 outside the system for resource treatment such as acid conditioning and application.
The alkali storage tank 17 is connected with an alkali liquor lift pump 18 through a pipeline, and can convey the alkali liquor back to a biochemical system 19 of the landfill leachate for alkali conditioning.
And a flowmeter, a pressure gauge and a conductivity meter are respectively arranged in the acid liquor circulation loop and the alkali liquor circulation loop and used for monitoring water quality parameters.
The electric driving membrane system is a device which realizes the separation of anions and cations under the dual functions of the electric field function and the anion and cation selection characteristic of the membrane. As shown in fig. 2, an anion selective membrane 22 and a cation selective membrane 21 are provided in the system. The anion selective membrane 21 is permeable to anions and not to water or cations. Cation selective membrane 22 is permeable to cations and not to water or anions. M in FIG. 2+Denotes a cation in salt solution, X-Denotes the anion in the salt solution. Under the action of the electric field, anions migrate to the anode and cations migrate to the cathode. As the ions migrate, the water is electrolyzed to produce hydrogen ions and hydroxyl ions. The hydrogen ions form an acid solution with the anions in the concentrated brine at the anode, and are discharged to the acid storage tank 13. The hydroxide ions form an alkali solution with the cations in the concentrated brine at the cathode, and the alkali solution is discharged to the alkali storage tank 17.
The operation process of the resource disposal method of the landfill leachate membrane filtration concentrated solution comprises the following steps:
(1) the membrane filtration concentrate produced by the landfill leachate treatment system is delivered to a strong brine storage tank 31, and under the action of a strong brine circulating pump 32, the strong brine is delivered to an electrically driven membrane system 15.
(2) The strong brine is subjected to the action of an electric field in the electric drive membrane system, anions and cations are directionally transferred, the anions are transferred to the anode, the cations are transferred to the cathode, and along with the ion transfer, water is electrolyzed to generate hydrogen ions and hydroxyl ions. The hydrogen ions form an acid solution with the anions in the concentrated brine at the anode, and are discharged to the acid storage tank 13. The hydroxide ions form an alkali solution with the cations in the concentrated brine at the cathode, and the alkali solution is discharged to the alkali storage tank 17.
(3) Simultaneously with the previous step, the acid solution in the acid storage tank 13 enters the electric drive membrane system 15 under the action of the acid solution circulating pump 14, and the anions in the concentrated brine are accumulated in the acid solution by repeating the previous step, so that the pH value of the acid solution is reduced and the acidity is enhanced.
(4) And simultaneously with the previous step, the alkali liquor in the alkali storage tank 17 enters the electric drive membrane system 15 under the action of the alkali liquor circulating pump 16, and cations in the concentrated brine are gathered in the alkali liquor by repeating the previous step, so that the PH value of the alkali liquor is increased, and the alkalinity is enhanced.
(5) When the acid liquid in the acid storage tank 13 reaches a certain concentration, the acid liquid is conveyed to other systems for treatment through the conveying function of the acid liquid lifting pump.
(6) When the alkali liquor in the alkali storage tank 17 reaches a certain concentration, the alkali liquor is conveyed to a biochemical treatment system of the landfill leachate for recycling under the conveying action of an alkali liquor lifting pump.
Application example 1
In a certain landfill site in the Shanghai, the reverse osmosis system of the landfill leachate treatment process generates 150m of strong brine3And d. The original design sends the strong brine into an incineration system for incineration treatment. As the salt content of the strong brine is high, the ash generated by incineration treatment is large, inorganic salt is transferred into the ash, and when the ash is buried, the soluble inorganic salt in the ash can be quickly dissolved in the landfill leachate, so that secondary pollution is caused. After technological transformation, the strong brine is sent into a resource disposal system of membrane filtration concentrated solution of garbage leachate for treatment. The strong brine is fed into the electric drive membrane system under the action of the strong brine circulating pump, and under the action of the strong brine circulating pump, anions and cations are directionally transferred, the anions enter the anode to generate acid liquor, and the cations enter the cathode to form alkali liquor. The acid liquor is passed through an acid liquor circulation loop formed from acid storage tank, acid liquor circulating pump and electric drive membrane, and the anion coming from strong brine is received to form acid liquor with higher acidity, and when it is reached to a certain concentration, it is transferred into other systems by means of acid liquor lift pump to make acidification treatment. The alkali liquor is passed through the alkali liquor circulation loop formed from alkali storage tank, alkali liquor circulating pump and electric drive membrane, and the cation coming from strong brine is received, and the alkali liquor with higher alkalinity is formed, and when it is reached to a certain concentration, it is passed through the alkali liquor lift pump and fed back into the biochemical system for treating refuse leachate.
The disposal system and the disposal method provided by the invention can replace processes such as incineration or evaporation concentration and the like, and carry out decrement and resource treatment on the membrane filtration concentrated solution in a more energy-saving, environment-friendly and environment-friendly manner.
The disposal system and the disposal method provided by the invention can be used for preparing acid-base products, and recycling the acid-base products to create additional values.
The disposal system and the disposal method provided by the invention have no secondary treatment requirement, and the system is more perfect and scientific.
The disposal system and the disposal method provided by the invention have wide application range, can flexibly allocate system setting parameters aiming at different water quality indexes, and ensure that the disposal requirements are met.
The disposal system and the disposal method provided by the invention are convenient to operate and manage, reduce the labor intensity of workers and are simple and convenient to maintain.
The disposal system and the disposal method provided by the invention have the advantages of low operation cost, low system investment and high economic benefit.
Claims (7)
1. A resource disposal system of landfill leachate membrane filtration concentrate is characterized by comprising:
an acid circulation loop, an alkali circulation loop, a strong brine circulation loop and an electric drive membrane system,
the acid circulation loop comprises: an acid liquor circulating pump and an acid storage tank, wherein the acid liquor circulating pump and the acid storage tank are communicated with an electric drive membrane system through a first pipeline, the electric drive membrane system conveys acid liquor into the acid storage tank through a second pipeline,
the caustic recirculation loop comprises: an alkali liquor circulating pump and an alkali storage tank, wherein the alkali liquor circulating pump and the alkali storage tank are communicated with an electric drive membrane system through a third pipeline, the electric drive membrane system conveys alkali liquor into the alkali storage tank through a fourth pipeline,
the strong brine circulation loop includes: strong brine storage tank, strong brine circulating pump, strong brine storage tank and strong brine circulating pump pass through the fifth pipeline with electric drive membrane system intercommunication, electric drive membrane system communicates strong brine storage tank through sixth pipeline.
2. A system for the reclamation of landfill leachate membrane filtrate concentrate of claim 1, further comprising:
and the acid lift pump is communicated with the acid storage tank through a pipeline and conveys the acid in the acid storage tank out.
3. A system for the reclamation of landfill leachate membrane filtrate concentrate of claim 1, further comprising:
and the alkali lift pump is communicated with the alkali storage tank through a pipeline and conveys out the alkali in the alkali storage tank.
4. A system for the recycling of landfill leachate membrane filtration concentrate of claim 1, wherein:
the acid liquor circulation loop and the alkali liquor circulation loop are respectively provided with a set of flow meter, a pressure meter and a conductivity meter.
5. A system for the recycling of landfill leachate membrane filtration concentrate of claim 1, wherein:
under the dual action of the electric field action and the anion and cation selection characteristic of the membrane, anions migrate to the anode, cations migrate to the cathode, along with the ion migration, water is electrolyzed to generate hydrogen ions and hydroxyl ions, the hydrogen ions form an acid solution with the anions in the concentrated brine at the anode, and the acid solution is discharged to an acid storage tank, and the hydroxyl ions form an alkali solution with the cations in the cathode and the concentrated brine, and then the alkali solution is discharged to an alkali storage tank.
6. A system for the reclamation of landfill leachate membrane filtration concentrate of claim 1, further comprising:
an electrical control system and valves and pipelines necessary for the system.
7. A resource disposal method of landfill leachate membrane filtration concentrated solution is characterized by comprising the following steps:
firstly, membrane filtration concentrated solution generated by a garbage leachate treatment system is conveyed to a strong brine tank, and strong brine is conveyed to an electric drive membrane system under the action of a strong brine circulating pump;
secondly, the concentrated brine is subjected to the action of an electric field in an electric drive membrane system, anions and cations migrate to the anode, the anions migrate to the cathode, along with the ion migration, water is electrolyzed to generate hydrogen ions and hydroxyl ions, the hydrogen ions form an acid solution with the anions in the concentrated brine at the anode, the acid solution is discharged to an acid storage tank, and the hydroxyl ions form an alkali solution with the cations in the concentrated brine at the cathode and are discharged to an alkali storage tank;
step three, occurring simultaneously with the step two, enabling the acid liquor in the acid storage tank to enter an electric drive membrane system under the action of an acid liquor circulating pump, and enabling anions in concentrated salt water to be gathered in the acid liquor, so that the pH value of the acid liquor is reduced, and the acidity is enhanced;
step four, occurring simultaneously with the step two, the alkali liquor in the alkali storage tank enters the electric drive membrane device through the action of the alkali liquor circulating pump, and cations in the concentrated brine are gathered in the alkali liquor, so that the PH value of the alkali liquor is increased, and the alkalinity is enhanced;
fifthly, when the acid liquor in the acid storage tank reaches the preset concentration, the acid liquor is conveyed to other systems for subsequent treatment under the conveying action of an acid liquor lifting pump;
and step six, when the alkali liquor in the alkali storage tank reaches the preset concentration, conveying the alkali liquor to a biochemical treatment system of the landfill leachate for recycling under the conveying action of an alkali liquor lifting pump.
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| CN202010111935.2A CN111252868A (en) | 2020-02-24 | 2020-02-24 | Resource disposal system and method for landfill leachate membrane filtration concentrated solution |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1523537A (en) * | 1975-06-27 | 1978-09-06 | Allied Chem | Process of producing sulphur dioxide from bisulphite |
| CN201648171U (en) * | 2009-10-12 | 2010-11-24 | 伍立波 | Leachate treatment device |
| CN103073131A (en) * | 2012-12-28 | 2013-05-01 | 中国环境科学研究院 | Process for treating amantadine bromination waste water and mineral acid and alkali recycling through bipolar membrane electrodialysis process |
| CN103086551A (en) * | 2013-01-22 | 2013-05-08 | 杭州蓝然环境技术有限公司 | Method for preparing acid-base from rare-earth sodium saponification waste water |
| CN103570175A (en) * | 2013-10-25 | 2014-02-12 | 浙江博世华环保科技有限公司 | Method for processing percolate membrane treatment concentrated solution of waste incineration plant |
-
2020
- 2020-02-24 CN CN202010111935.2A patent/CN111252868A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1523537A (en) * | 1975-06-27 | 1978-09-06 | Allied Chem | Process of producing sulphur dioxide from bisulphite |
| CN201648171U (en) * | 2009-10-12 | 2010-11-24 | 伍立波 | Leachate treatment device |
| CN103073131A (en) * | 2012-12-28 | 2013-05-01 | 中国环境科学研究院 | Process for treating amantadine bromination waste water and mineral acid and alkali recycling through bipolar membrane electrodialysis process |
| CN103086551A (en) * | 2013-01-22 | 2013-05-08 | 杭州蓝然环境技术有限公司 | Method for preparing acid-base from rare-earth sodium saponification waste water |
| CN103570175A (en) * | 2013-10-25 | 2014-02-12 | 浙江博世华环保科技有限公司 | Method for processing percolate membrane treatment concentrated solution of waste incineration plant |
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Application publication date: 20200609 |