CN210620514U

CN210620514U - Flexible landfill leachate treatment system

Info

Publication number: CN210620514U
Application number: CN201920988470.1U
Authority: CN
Inventors: 黄泽强; 王刚; 宗张璋
Original assignee: CITIC Envirotech Guangzhou Co Ltd
Current assignee: CITIC Envirotech Guangzhou Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-05-26
Anticipated expiration: 2029-06-28

Abstract

The utility model discloses a flexible landfill leachate treatment system, including liquid treatment device and with liquid treatment device assorted air-blowing system, liquid treatment device including the filtration liquid collecting pit, chemical reaction pond, coagulating basin, flocculation basin, pressure filter, filtrate tank, safety filter and the vaporization system that set gradually, comdenstion water among the vaporization system passes through A2O, MBR, RO, DTRO and reuse water system in proper order, MBR, RO and DTRO three's dense water reenters in A2O, mother liquor among the vaporization system passes through single-effect evaporation cauldron, comdenstion water among the single-effect evaporation cauldron gets into in A2O, the concentrate among the single-effect evaporation cauldron produces waste salt after pressure filter centrifuge; the air blowing system blows air through an air blower and leads the air into a percolate collecting tank, a chemical reaction tank, a coagulation tank, a flocculation tank, A2O and MBR. The device integrates and combines different devices, so that the whole process is stable and can reach the standard of reclaimed water reuse.

Description

Flexible landfill leachate treatment system

Technical Field

The utility model relates to a penetrant processing apparatus improves design technical field, especially relates to a flexible landfill leachate treatment system.

Background

In the prior art, the landfill leachate treatment difficulty is high, and especially the landfill leachate is high in treatment difficulty, high in treatment cost and difficult in operation and maintenance due to high organic matters, high salt and high COD.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a flexible landfill leachate processing system, through different equipment integration and combination for whole technology is stable and can reach the standard of reuse of reclaimed water.

In order to achieve the above purpose, the utility model discloses a technical scheme is: a flexible landfill leachate treatment system comprises a liquid treatment device and an air blowing system matched with the liquid treatment device, wherein the liquid treatment device comprises a leachate collecting tank, a chemical reaction tank, a coagulation tank, a flocculation tank, a filter press, a filtrate tank, a security filter and an evaporation system which are sequentially arranged, condensed water in the evaporation system sequentially passes through A2O, MBR, RO, DTRO and a reuse water system, concentrated water of the MBR, the RO and the DTRO reenters into A2O, mother liquor in the evaporation system passes through a single-effect evaporation kettle, the condensed water in the single-effect evaporation kettle enters into A2O, and concentrated solution in the single-effect evaporation kettle passes through the filter press/centrifuge to generate waste salt; the air blowing system blows air through an air blower and leads the air into a percolate collecting tank, a chemical reaction tank, a coagulation tank, a flocculation tank, A2O and MBR.

Furthermore, the percolate collecting tank is connected with percolate generated by a landfill through a pipeline, and the percolate is homogenized and uniformly distributed through air blowing and stirring by a blower.

Further, sulfuric acid, hydrogen peroxide, ferrous sulfate, alkali liquor and sodium sulfide are sequentially added into the chemical reaction tank.

Further, PAC was added to the coagulation tank, PAM was added to the flocculation tank, and sludge produced by the filter press was subjected to outsourcing treatment.

Further, the evaporation system comprises a single-effect evaporator, a double-effect evaporator and a multi-effect evaporator, wherein the evaporator consists of a heater, a separator and a forced circulation pump.

Further, as mentioned above, A2O is an anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal device, MBR is a membrane filtration activated sludge device, RO is an RO membrane using pressure difference as driving force, and DTRO is a membrane separation device using pressure as driving force.

Further, the reuse water system as described above collects the temporarily stored DTRO produced water.

Compared with the prior art, the beneficial effects of the utility model are that: the device solves the problems of high treatment difficulty, high treatment cost and difficult operation and maintenance of the leachate in the refuse landfill due to high organic matters, high salt and high COD, and ensures that the whole process is stable and can reach the standard of reclaimed water recycling through different equipment integration and combination.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of a reaction system of the present invention;

FIG. 3 is a schematic view of a solid-liquid separation system of the present invention;

fig. 4 is a schematic view of the evaporation system of the present invention.

Detailed Description

The following detailed description is provided to further explain the technical features and advantages of the present invention by referring to the accompanying drawings in combination with the embodiments.

As shown in fig. 1-4, the utility model discloses a flexible landfill leachate treatment system, include liquid treatment device and with liquid treatment device assorted air-blowing system, liquid treatment device including the filtration liquid collecting pit, chemical reaction pond, coagulating basin, flocculating basin, pressure filter, filtrate pond, safety filter and the evaporating system that sets gradually, comdenstion water among the evaporating system passes through A2O, MBR, RO, DTRO and reuse water system in proper order, MBR, RO and DTRO three's dense water reenters in A2O, mother liquor among the evaporating system passes through single-effect evaporation cauldron, comdenstion water among the single-effect evaporation cauldron gets into in A2O, produce waste salt behind the concentrate in the single-effect evaporation cauldron through pressure filter/centrifuge; the air blowing system blows air through an air blower and leads the air into a percolate collecting tank, a chemical reaction tank, a coagulation tank, a flocculation tank, A2O and MBR.

Furthermore, the percolate collecting tank is connected with percolate generated by a landfill through a pipeline, and the percolate is homogenized and uniformly distributed through air blowing and stirring of a blower; sulfuric acid, hydrogen peroxide, ferrous sulfate, alkali liquor and sodium sulfide are sequentially added into the chemical reaction tank; PAC is added into the coagulation tank, PAM is added into the flocculation tank, and sludge generated by the filter press is subjected to outsourcing treatment; the evaporation system comprises a single-effect evaporator, a double-effect evaporator and a multi-effect evaporator, and the evaporator consists of a heater, a separator and a forced circulation pump; the A2O is an anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal device, the MBR is a membrane filtration activated sludge device, the RO is an RO membrane taking pressure difference as driving force, and the DTRO is a membrane separation device taking pressure as driving force; the reuse water system collects temporarily stored DTRO produced water.

The utility model discloses a function is for the instability that can reduce the material effectively to the impact of equipment for equipment operation is stable. Additionally, the utility model discloses according to the difference of material characteristic, use different technology combinations respectively. According to the application range of the material characteristics entering different equipment, leachate of different batches or different concentrations enters different process equipment combinations through the detection of certain indexes. The utility model discloses divide the combination from high COD, well high COD, low COD and high salinity, well high salinity, low salinity, wherein the practical process route that gets is as follows.

Group of	Composition information	Process route
			A	High COD, high salinity/medium salinity/low salinityDividing; in COD, high salinity/medium salinity	Leachate collection pool, chemical reaction pool/tank, coagulation pool, flocculation pool, filter press, filtrate pool and security filtration Collector + evaporation system + A2O + MBR + RO + DTRO + reuse water collecting tank
II	Medium COD, low salt content	Leachate collection pool, chemical reaction pool/tank, coagulation pool, flocculation pool, filter press, filtrate pool and security filtration Device + evaporation system + A2O + MBR + RO + reuse water collecting tank
			III	Low COD, high salinity/medium salinity	Percolate collecting tank + coagulation tank + flocculation tank + filter press + filtrate tank + security filter + evaporation system + A2O + MBR + RO + DTRO + reuse water collecting tank
Fourthly	Low COD and low salt content	Leachate collecting tank + A2O + MBR + RO + reuse water collecting tank

Remarking: the high COD value is more than or equal to 30000mg/L, the medium COD value is 65000-30000 mg/L, and the low COD value is less than or equal to 6500 mg/L. The high salinity is more than or equal to 3 percent, the medium salinity is 0.8 to 3 percent, and the low salinity is less than or equal to 0.8 percent.

Introduction of specific subunit functions:

a percolate collecting tank: and collecting percolate generated by the landfill, and homogenizing and uniformly measuring the percolate through gas stirring.

Chemical reaction tank/pot: in a chemical reaction tank, regulating the pH value to 3-5 by using sulfuric acid, and then adding a Fenton reagent for Fenton oxidation. The oxidation time and the amount of Fenton reagent added are generally determined by the level of the COD value, which is reduced by the Fenton oxidation. The Fenton reagent oxidizes the organic matter and mainly reacts as follows:

R-H +•OH→R•+ H₂O

X- +•OH→X•+ OH-

and after the Fenton oxidation is carried out fully, adding liquid caustic soda to adjust the pH value to 6-9, and then adding sodium sulfide to carry out heavy metal precipitation.

A coagulation tank: the colloid in the wastewater is adsorbed and bonded by adding polyaluminium chloride (PAC) to form fine alumen ustum with the size of more than 5 mu m but not meeting the requirement of gravity sedimentation. Therefore, the alumen ustum is enlarged through the flocculation effect, and the reliable gravity sinking of the alumen ustum is achieved.

A flocculation tank: by adding Polyacrylamide (PAM), alum floc in the wastewater is enlarged and can sink by the gravity of the wastewater.

A filter press: pumping the wastewater and sludge in the flocculation tank into a filter press for full filter pressing to separate mud from water, outsourcing the generated sludge,

a filtrate tank: the filtrate pool is mainly used for collecting the wastewater generated by the filter press and has the functions of homogenizing and equalizing the quantity.

A cartridge filter: the wastewater in the filtrate tank is pumped into the security filter for filtration, and suspended matters in the wastewater are reduced under the action of the security filter, so that the suspended matters in the wastewater are reduced, and the wastewater entering the evaporation system is protected.

An evaporation system: in the evaporation system, single-effect, double-effect and multi-effect evaporation can be selected for treatment according to actual treatment capacity. The evaporation system is mainly used for carrying out treatment through evaporation concentration desalination, so that the salinity in the wastewater is reduced. The condensed water generated in the evaporation concentration process enters A2O for biochemical treatment, and the waste salt is disposed outside. If single-effect wastewater treatment is adopted, the steam temperature is controlled to be about 120 ℃; if the double-effect treatment is adopted, the steam temperature of the double-effect heater is controlled to be about 120 ℃, and the condensate water generated by the double-effect is used for preheating in the first effect; if the triple-effect evaporator is adopted for treatment, the wastewater is pumped to a first-stage preheater, preheated by condensed water and then enters the triple-effect evaporator for evaporation, the evaporated material is sent to a second-stage preheater and a third-stage preheater for preheating and then enters a first-effect evaporator for evaporation, the first-effect discharge enters a second-effect evaporator for evaporation, the second-effect discharge enters the triple-effect evaporation, fresh steam is used in the first effect, and secondary steam generated in the first effect is used as a heating source of each subsequent-effect evaporator.

A2O: anaerobic-anoxic-aerobic biological denitrificationThe phosphorus process mainly plays a role in nitrogen and phosphorus removal. When the wastewater enters biochemical treatment, the wastewater is treated in an anaerobic tank, organic substances are decomposed by anaerobic bacteria under anaerobic conditions to generate methane and carbon dioxide, and the anaerobic treatment is a process of removing the organic substances from the organic substances to generate CO under the condition of air deficiency₂In (1). Then enters an anoxic tank for reaction, mainly plays a role in removing nitrate nitrogen through denitrification in the denitrification process, removes partial BOD at the same time, and also has a role in improving biodegradability through hydrolysis reaction. And finally, the mixture enters an aerobic tank for reaction.

MBR: MBR is an activated sludge system, mainly through membrane filtration for go out water suspended solid and turbidity and be close to zero, and can get rid of bacterial virus etc. but the resource of direct retrieval and utilization realization waste water. And (4) feeding the produced water of the MBR to an RO membrane for further treatment.

And (3) RO: the RO membrane is a membrane separation operation that separates a solvent from a solution using a pressure difference as a driving force. And pumping the produced water in the MBR into the RO membrane, wherein the removal rate of organic matters and salts in the water can reach more than 99% and 93% respectively, the chemical oxygen demand of the produced water is less than 10mg/L, and the conductivity is less than 80 muS/cm.

DTRO: the DTRO membrane is a membrane separation technology taking pressure as driving force, the basic principle of the DTRO membrane is that pressure difference is taken as driving force, pressure exceeding osmotic pressure of solution is applied to a semipermeable membrane, water pressure in concentrated solution is permeated to one side of dilute solution of the membrane, and the concentrated solution is continuously concentrated and remained on the other side of the membrane, so that the aim of separating solute from water is fulfilled. Almost all impurities in the water can be removed including various inorganic salts, molecules, organic colloids, bacteria, viruses, heat sources, etc.

A reuse water system: the reuse water system is mainly used as the water produced by temporarily storing the DTRO.

The utility model discloses the device includes filtration liquid collecting pit, chemical reaction pond/jar, coagulating basin, flocculation basin, pressure filter, filtrate pond, safety filter ware, evaporating system, A2O, MBR, RO, DTRO, reuse water collecting pit. The utility model provides a landfill leachate lead to handling the problem that the degree of difficulty is big, the treatment cost is high, the operation is maintained difficultly because of high organic matter, high salt, high COD for the equipment integration and the combination through the difference, make whole technology stable and can reach the standard of reuse of reclaimed water.

In the device of the utility model, the blower, the pump and the like are the prior art or the materials, and the affiliated technical personnel can directly purchase or order from the market according to the required product model and specification.

The electrical components are electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device for controlling a computer and the like.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

The present invention is described in detail in the above embodiments, and it should be understood that the described embodiments are not limited to the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Claims

1. A flexible landfill leachate treatment system is characterized by comprising a liquid treatment device and an air blowing system matched with the liquid treatment device, wherein the liquid treatment device comprises a leachate collecting tank, a chemical reaction tank, a coagulation tank, a flocculation tank, a filter press, a filtrate tank, a security filter and an evaporation system which are sequentially arranged, condensed water in the evaporation system sequentially passes through A2O, MBR, RO, DTRO and a reuse water system, concentrated water of the MBR, the RO and the DTRO reenters into A2O, mother liquor in the evaporation system passes through a single-effect evaporation kettle, the condensed water in the single-effect evaporation kettle enters into A2O, and concentrated solution in the single-effect evaporation kettle passes through the filter press/centrifuge to produce waste salt; the air blowing system blows air through an air blower and leads the air into a percolate collecting tank, a chemical reaction tank, a coagulation tank, a flocculation tank, A2O and MBR.

2. The flexible landfill leachate treatment system of claim 1, wherein the leachate collection tank is piped to the leachate generated by the landfill, and the leachate is homogenized and homogenized by blower air agitation.

3. The flexible landfill leachate treatment system of claim 1, wherein the chemical reaction tank is sequentially filled with sulfuric acid, hydrogen peroxide, ferrous sulfate, alkali liquor and sodium sulfide.

4. The flexible landfill leachate treatment system of claim 1, wherein the coagulation tank is filled with PAC, the flocculation tank is filled with PAM, and sludge generated by the filter press is subjected to outsourcing treatment.

5. The flexible landfill leachate treatment system of claim 1, wherein the evaporation system comprises single-effect, double-effect, multi-effect evaporators, the evaporators comprising heaters, separators and forced circulation pumps.

6. The flexible landfill leachate treatment system of claim 1, wherein the A2O is an anaerobic-anoxic-aerobic biological nitrogen and phosphorus removal device, the MBR is a membrane filtration activated sludge device, the RO is an RO membrane using pressure difference as driving force, and the DTRO is a membrane separation device using pressure as driving force.

7. The flexible landfill leachate treatment system of claim 1, wherein the reuse water system collects temporarily stored DTRO produced water.