CN110655253A - Full-quantitative treatment system and method for aged refuse landfill leachate - Google Patents
Full-quantitative treatment system and method for aged refuse landfill leachate Download PDFInfo
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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
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention belongs to the technical field of wastewater treatment, and particularly relates to a full-quantization treatment system for percolate in an old refuse landfill, wherein an adjusting tank is communicated with a liquid inlet of a two-stage DTRO treatment system; the concentrated solution outlet of the two-stage DTRO treatment system is communicated with the liquid inlet of the HPRO treatment system; the permeate liquid outlet and the concentrated liquid outlet of the HPRO treatment system are respectively communicated with the permeate liquid treatment system and the liquid inlet of the evaporator, and the evaporation mother liquid outlet and the evaporation effluent outlet of the evaporator are respectively communicated with the liquid inlet of the solidification device and the permeate liquid treatment system. The invention also provides a full-quantitative treatment method of the percolate, the percolate of the regulating tank is sequentially treated by the two-stage DTRO treatment system and the HPRO treatment system, the obtained concentrated solution is sequentially treated by the evaporator and the curing device and then is safely buried, and the permeate liquid is sequentially treated by the two-stage RO treatment system and the ion exchange resin device and then is discharged after reaching the standard. The invention realizes the full-scale treatment of the percolate through multi-stage membrane treatment, evaporation, solidification and resin adsorption.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a full-quantitative treatment system and method for percolate of an aged refuse landfill.
Background
With the increasing production of landfill leachate, the treatment of membrane filtration concentrated solution of landfill leachate becomes an important problem threatening the environmental safety. Although there are many methods for treating the landfill leachate membrane filtration concentrated solution, the treatment means of the landfill leachate membrane filtration concentrated solution in China still mainly adopts recharge as a main treatment means at present, and long-term recharge can cause the salt content of leachate effluent to be increased, influence the stability of the treatment process and also possibly cause adverse effects on a landfill biological system; in addition, the recharging of a large amount of fluid can improve the water level of the garbage pile body, influence the stability of the garbage pile body and bring potential safety hazards.
China journal China water supply and drainage discloses that an MBR/DTRO process is used for treating percolate of middle and old aged refuse landfill sites, and a two-stage AO + UF + DTRO process is adopted. The DTRO concentrated solution adopts DTNF + HPRO + evaporation crystallization process. The process has long flow, large floor area of a biochemical system, large system investment, high operation cost and serious scaling because the DTRO concentrated solution adopts an evaporative crystallization process.
Chinese patent document CN108975598A discloses a zero-emission old landfill leachate treatment device, which comprises: the system comprises a pretreatment system, a DTRO system and a DTRO concentrated solution treatment system. The DTRO concentrate was treated with HPRO and a submerged combustion evaporator. The process has high investment cost and high operation cost. In addition, the system requires natural gas, which is extremely inconvenient to install for remote old landfill transportation.
Therefore, aiming at the problems of the membrane concentrated solution recharging, the increasingly poor system stability and the increasingly low water yield of the existing old refuse landfill, a novel full-quantitative treatment system and a method for the percolate of the old refuse landfill are needed to be designed to overcome the problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a full-quantitative treatment system and method for percolate of an old refuse landfill, which can solve the problem that the existing DTRO concentrated solution is not discharged and realize full-quantitative treatment of the percolate of refuse.
In order to achieve the purpose, the technical scheme of the invention is a full-quantitative treatment system for percolate of an old refuse landfill, which comprises a regulating tank, a two-stage DTRO treatment system, an HPRO treatment system, an evaporator, a solidification device and a permeate treatment system; the regulating tank is communicated with a liquid inlet of the two-stage DTRO treatment system; a concentrated solution outlet of the two-stage DTRO treatment system is communicated with a liquid inlet of the HPRO treatment system; the permeate liquid of HPRO processing system export with permeate liquid processing system intercommunication, HPRO processing system's concentrate export with the inlet of evaporimeter intercommunication, the evaporation mother liquor export of evaporimeter with solidification equipment's inlet intercommunication, the evaporation effluent outlet of evaporimeter with permeate liquid processing system intercommunication.
Furthermore, permeate liquid processing system includes two-stage RO processing system, HPRO processing system's permeate liquid export with the evaporation effluent water outlet all with two-stage RO processing system's inlet intercommunication, two-stage RO processing system's concentrate export with HPRO processing system's inlet intercommunication.
Furthermore, the permeate liquid treatment system also comprises an ion exchange resin device, and the permeate liquid outlet of the two-stage RO treatment system is communicated with the liquid inlet of the ion exchange resin device.
Furthermore, the two-stage RO treatment system comprises a first-stage RO treatment unit and a second-stage RO treatment unit, wherein a permeate outlet of the HPRO treatment system and an evaporation effluent outlet of the evaporation system are both communicated with a liquid inlet of the first-stage RO treatment unit, and a concentrated liquid outlet of the first-stage RO treatment unit is communicated with a liquid inlet of the second-stage RO treatment unit; and the concentrated solution outlet of the first-stage RO treatment unit and the concentrated solution outlet of the second-stage RO treatment unit are both communicated with the liquid inlet of the HPRO treatment system.
Further, solidification equipment is including mixing mixer and curing agent storehouse, the evaporation mother liquor export of curing agent storehouse and evaporimeter all with mix the mixer and be connected.
Further, the two-stage DTRO treatment system comprises a one-stage DTRO treatment unit and a two-stage DTRO treatment unit, wherein a permeate liquid outlet of the MBR treatment system is communicated with a liquid inlet of the one-stage DTRO treatment unit, a permeate liquid outlet of the one-stage DTRO treatment unit is communicated with a liquid inlet of the two-stage DTRO treatment unit, and a concentrate liquid outlet of the one-stage DTRO treatment unit is communicated with a concentrate liquid outlet of the two-stage DTRO treatment unit and is communicated with a liquid inlet of the HPRO treatment system.
Furthermore, a permeate liquid outlet of the secondary DTRO treatment unit is communicated with an inlet of a degassing tower, and permeate liquid is treated by the degassing tower and then discharged after reaching the standard.
The invention also provides a full-quantitative treatment method for the aged refuse landfill leachate, which comprises the following steps:
1) treating the percolate in the regulating tank in a two-stage DTRO treatment system to obtain DTRO permeate and DTRO concentrated solution, and treating the DTRO permeate by a degassing tower to reach the standard and discharging;
2) the DTRO concentrated solution enters an HPRO treatment system for treatment to obtain HPRO permeate solution and HPRO concentrated solution, the HPRO concentrated solution enters an evaporator for further concentration to obtain evaporated water and evaporated mother liquor, the evaporated mother liquor enters a solidification device for solidification, and the obtained solidified product is safely buried;
3) the HPRO permeate and the evaporated effluent enter a two-stage RO treatment system for further optimization to obtain RO permeate and RO concentrated solution, and the RO concentrated solution returns to the HPRO treatment system for treatment again;
4) and treating the RO permeate by adopting an ion exchange resin device, and then discharging the treated RO permeate after reaching the standard.
Further, in the step 2), before the DTRO concentrated solution enters the HPRO treatment system, the pH value of the DTRO concentrated solution is adjusted to 4-6, and then the DTRO concentrated solution enters the HPRO treatment system for HPRO treatment.
Further, in the step 2), evaporating the mother liquor, feeding the mother liquor into a mixing stirrer of a curing device, and adding a curing agent for curing; the curing agent comprises cement and lime, and the adding ratio of the cement to the lime is 0.1-0.5: 1.
compared with the prior art, the invention has the following beneficial effects:
(1) the system and the method for fully treating the percolate of the old refuse landfill can effectively solve the problems of high COD (chemical oxygen demand), high ammonia nitrogen, high conductivity, poor biodegradability, low water yield of a concentrated solution recharging system, poor system stability and the like of the current old landfill, have no recharging and enrichment phenomena, are advanced in process, have the water yield of 90-96 percent, have no concentrated solution, and are a fully-quantified treatment process;
(2) the system and the method for fully treating the percolate of the old refuse landfill do not comprise a biochemical treatment system, have small occupied area and quick start, and are suitable for treating the percolate of the old refuse landfill;
(3) according to the invention, COD, ammonia nitrogen and the like in the produced water are reduced through multi-stage membrane treatment, and the ammonia nitrogen and total nitrogen in the produced water are adsorbed through an ion exchange resin device after the multi-stage membrane treatment, so that the effluent is ensured to reach the discharge standard;
(4) the evaporation system adopted by the invention has high water yield, large concentration multiple, difficult scaling and stable operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a leachate full-scale treatment system for an aged refuse landfill according to an embodiment of the present invention;
in the figure: 1. a regulating reservoir, 2, a two-stage DTRO treatment system, 3, an HPRO treatment system, 4, an evaporator, 5, a curing device, 6, a two-stage RO treatment system, 7, an ion exchange resin device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example 1
As shown in fig. 1, the present embodiment provides a full-scale treatment system for percolate from an old refuse landfill, which comprises a regulating tank 1, a two-stage DTRO treatment system 2, an HPRO treatment system 3, an evaporator 4, a solidification device 5 and a permeate treatment system; the adjusting tank 1 is communicated with a liquid inlet of the two-stage DTRO treatment system 2; the concentrated solution outlet of the two-stage DTRO treatment system 2 is communicated with the liquid inlet of the HPRO treatment system 3; the permeate liquid outlet of the HPRO treatment system 3 is communicated with the permeate liquid treatment system, the concentrated liquid outlet of the HPRO treatment system 3 is communicated with the liquid inlet of the evaporator 4, the evaporation mother liquid outlet of the evaporator 4 is communicated with the liquid inlet of the solidification device 5, and the evaporation effluent outlet of the evaporator 4 is communicated with the permeate liquid treatment system. This embodiment is directed against old age landfill membrane concentrate and recharges, system stability is more and more poor and the rate of water production is more and more low, improve a old age landfill leachate full quantization processing system, can reduce COD, ammonia nitrogen and sulphide etc. in the product water through multistage membrane processing and permeate liquid processing system, solve the concentrate through evaporimeter 4 and solidification equipment 5 and do not have the difficult problem of going out of the way, realize landfill leachate's full quantization processing, and the rate of water production of system is up to 90 ~ 96%, do not contain biochemical treatment system, the area is little, start-up is fast, be fit for old age landfill leachate and handle.
Specifically, the permeate treatment system in this embodiment includes a two-stage RO treatment system 6, the permeate outlet and the evaporated water outlet of the HPRO treatment system 3 are both communicated with the liquid inlet of the two-stage RO treatment system 6, and the concentrate outlet of the two-stage RO treatment system 6 is communicated with the liquid inlet of the HPRO treatment system 3. The two-stage RO treatment system 6 comprises a first-stage RO treatment unit and a second-stage RO treatment unit, a permeate outlet of the HPRO treatment system 3 and an evaporation effluent outlet of the evaporation system are both communicated with a liquid inlet of the first-stage RO treatment unit, and a concentrated liquid outlet of the first-stage RO treatment unit is communicated with a liquid inlet of the second-stage RO treatment unit; the concentrated solution outlet of the first-stage RO treatment unit and the concentrated solution outlet of the second-stage RO treatment unit are both communicated with the liquid inlet of the HPRO treatment system 3. The two-stage RO processing system 7 of the present embodiment may be a two-stage MTRO or a two-stage DTRO. Optimally, the permeate liquid treatment system further comprises an ion exchange resin device 7, the permeate liquid outlet of the secondary RO treatment unit is communicated with the liquid inlet of the ion exchange resin device 7, the ion exchange resin device 7 can adsorb ammonia nitrogen and total nitrogen in the effluent water, and the effluent water quality is further ensured to reach the discharge standard. The strong acid cation exchange resin with strong selectivity to ammonia nitrogen is selected for the ion exchange system in the ion exchange resin device 7, so that the ion exchange resin device has the advantages of strong adsorption capacity, good selectivity, simple equipment, low cost and the like, can effectively remove the residual ammonia nitrogen intercepted by the front-end membrane, and ensures that the effluent of the system meets the requirements. In addition, the ion exchange resin device 8 can also be provided with a regeneration device and a backwashing device, and the backwashing device regularly backwashes the resin to ensure the adsorption effect; when the adsorption effect is continuously reduced, the adsorption capacity of the resin is restored by the regeneration device.
Specifically, the evaporator in the embodiment can adopt an MVR evaporator, a low-temperature evaporator and the like, the curing device 5 comprises a mixing stirrer and a curing agent bin, the curing agent bin and an evaporation mother liquor outlet of the evaporator 4 are connected with the mixing stirrer, the curing agent and the evaporation mother liquor are fully mixed and stirred in the mixing stirrer, the mixing and stirring are generally 5 ~ 30 minutes, a certain proportion of the curing agent is added, the solidification time is shortest, the chemical usage amount is minimum, the residue leaching rate is minimum, the curing agent is generally cement and lime, the adding ratio is 0.1-0.5: 1, the cured product is packaged by a packaging machine and then safely buried, in addition, the evaporation system is also provided with a medicine adding device, acid, a defoaming agent, a cleaning agent and the like are added respectively, and a backwashing device is also arranged for periodic backwashing.
Specifically, the two-stage DTRO processing system 2 in this embodiment includes a first-stage DTRO processing unit and a second-stage DTRO processing unit, the permeate outlet of the MBR processing system is communicated with the liquid inlet of the first-stage DTRO processing unit, the permeate outlet of the first-stage DTRO processing unit is communicated with the liquid inlet of the second-stage DTRO processing unit, and the concentrate outlet of the first-stage DTRO processing unit and the concentrate outlet of the second-stage DTRO processing unit are both communicated with the liquid inlet of the HPRO processing system 3. Optimally, a permeate liquid outlet of the secondary DTRO treatment unit is communicated with an inlet of the degassing tower, and permeate liquid treated by the secondary DTRO treatment unit is treated by the degassing tower and then is discharged after reaching the standard. The two-stage DTRO treatment system 3 further comprises a sand-containing filter tank, an acid adjusting device and a security filter, wherein the acid adjusting device adjusts the pH value of the DTRO concentrated solution. The sand filter tank can intercept large particles, the filtering precision is 50 mu m, and colloidal particles and high molecular organic matters can be effectively removed. The precision of the cartridge filter filtration is 10 μm to provide a final protective barrier for the membrane column.
As shown in fig. 1, the present embodiment further provides a full-quantitative treatment method for leachate of an old refuse landfill, which includes the following steps:
1) the leachate of the regulating tank 1 enters a two-stage DTRO treatment system 2 for treatment to obtain DTRO permeate and DTRO concentrated solution, and the DTRO permeate is treated by a degassing tower and then discharged after reaching the standard;
specifically, the two-stage DTRO treatment system 2 comprises a first-stage DTRO treatment unit and a second-stage DTRO treatment unit, MBR penetrating fluid is firstly treated in the first-stage DTRO treatment unit to obtain first-stage DTRO permeating fluid and first-stage DTRO concentrated fluid, the first-stage DTRO permeating fluid is treated in the second-stage DTRO treatment unit to obtain second-stage DTRO permeating fluid and second-stage DTRO concentrated fluid, and the second-stage DTRO permeating fluid is treated by a degassing tower and then is discharged after reaching the standard; the water yield of the primary DTRO is 70-80%, the operation pressure of the operation pressure is 0-100 bar, the water yield of the secondary DTRO is 80-90%, and the operation pressure of the operation pressure is 0-100 bar;
2) the primary DTRO concentrated solution and the secondary DTRO concentrated solution enter an HPRO treatment system 3 for treatment to obtain HPRO permeate liquid and HPRO concentrated solution, the water yield of the HPRO is 40-60%, and the operating pressure is 0-120 bar; the HPRO concentrated solution enters an evaporator 4 for further concentration to obtain evaporated water and evaporated mother liquor, the evaporated mother liquor enters a curing device 5 for curing, and the obtained cured product is safely buried; the water yield of the evaporation system is 70-90%, and the water content of the mother liquor is about 40-60%;
3) the HPRO permeate and the evaporated effluent still contain partial COD, ammonia nitrogen, sulfide and other substances, in order to make the effluent reach the standard, the HPRO permeate and the evaporated effluent enter a two-stage RO treatment system 6 for further optimizing the effluent, the two-stage RO treatment system 6 can intercept macromolecular substances to reduce the COD to be below 60mg/L to obtain RO permeate and RO concentrate, and the RO concentrate returns to the HPRO treatment system 3 for treatment again; the water yield of the two-stage RO is 80-90%, and the operating pressure is 0-100 bar;
4) in order to ensure that the effluent further reaches the standard, an ion exchange resin device 7 is adopted to adsorb ammonia nitrogen and total nitrogen in the RO permeate liquid, so that the water is discharged after the water quality meets the discharge requirement. Specifically, according to the field operation condition, if the ammonia nitrogen is high, the ion exchange resin device 8 prepares an ammonia nitrogen adsorption resin tank; if the total nitrogen is high, the ion exchange resin device 8 prepares a total nitrogen adsorption resin tank; in addition, the ion exchange resin device 8 can also be used for simultaneously preparing an ammonia nitrogen adsorption resin tank and a total nitrogen adsorption resin tank.
Optimally, in the step 2), because the alkalinity and the hardness of the DTRO concentrated solution are higher, in order to ensure that an HPRO treatment system runs more stably, an acid adding device is arranged in the two-stage DTRO treatment system 2, hydrochloric acid is added before the DTRO concentrated solution enters the HPRO treatment system 3 to adjust the pH value of the DTRO concentrated solution to 4-6, and then the DTRO concentrated solution enters the HPRO treatment system 3 to carry out HPRO treatment, so that the water production rate is improved, the membrane pollution and the membrane cleaning frequency are reduced, and the ammonia nitrogen concentration of effluent is reduced.
Optimally, in the step 2), the evaporation mother liquor enters a mixing stirrer of a curing device 5, curing agent is added into the mixing stirrer for curing, and the stirring is carried out for 5 ~ 30 minutes, wherein the curing agent comprises cement and lime, and the adding ratio of the cement to the lime is 0.1-0.5: 1.
Example 2
A certain domestic garbage landfill in Hubei province belongs to old garbage landfill, and is sealed at present, and the garbage percolate water quality of the landfill is as follows:
as can be seen from Table 1, the landfill leachate has high COD, high ammonia nitrogen, high conductivity and high sulfide, and is difficult to reach the standard by adopting the conventional biochemical treatment and membrane treatment process.
The processing system and the method provided by the embodiment 1 of the invention are adopted for processing:
firstly, the landfill leachate of a regulating tank 1 is pumped into a two-stage DTRO treatment system 3 through a lift pump, the water yield of the first-stage DTRO is 75%, the operating pressure is 50bar, the water yield of the second-stage DTRO is 90%, and the operating pressure is 35 bar; then, the DTRO concentrated solution enters an HPRO treatment system 4, the HPRO permeate enters a two-stage MTRO treatment system, the water yield of the HPRO is 50%, and the operating pressure is 105 bar; the HPRO concentrated solution enters a low-temperature evaporation system for further concentration, the evaporated water enters a two-stage MTRO treatment system, the evaporated mother liquor enters solidification equipment, the water yield of the evaporation system is 85 percent, and the water content of the mother liquor is about 50 percent; HPRO permeate and evaporated water enter two-stage MTRO reverse osmosis treatment, the water production rate of MTRO is 85%, the operating pressure is 15bar, in order to ensure that the effluent further reaches the standard, the HPRO produced water is treated by ion exchange resin, the COD of the effluent reaches 9.8mg/L, the ammonia nitrogen reaches 3.24mg/L, the total nitrogen reaches 12.4mg/L, and the total nitrogen is far lower than the second requirement of the pollution control standard of a domestic garbage landfill (GB 16889-2008); the low-temperature evaporation mother liquor enters curing equipment for curing, cement and lime are adopted as curing agents, and the adding ratio is 0.2: 1, after mixing and stirring for 20 minutes generally, conveying the mixture to a mold through a conveyor for solidification and molding; the water content of the cured product is 30 percent, the total copper is 0.02mg/L, the total zinc is 0.005mg/L, the total lead is 0.1mg/L, the total chromium is 0.05mg/L, the hexavalent chromium is 0.004mg/L, the mercury is 0.02ug/L, the beryllium is 0.2ug/L, the barium is not detected, the total nickel is 0.04mg/L, the silver is 0.01mg/L, the total arsenic is 0.1ug/L, the selenium is 0.2ug/L, and the water content is far lower than the requirement of the pollution control standard of a domestic garbage landfill (GB 16889-2008) table.
Example 3
A certain household garbage landfill in Henan province belongs to old garbage landfill, and the garbage leachate of the landfill has the following water quality:
as can be seen from Table 2, the landfill leachate has high COD, high ammonia nitrogen, high sulfide and high conductivity, and is difficult to reach the standard by adopting the conventional biochemical treatment and membrane treatment process.
The processing system and the method provided by the embodiment 1 of the invention are adopted for processing:
firstly, the landfill leachate of a regulating reservoir 1 enters a two-stage DTRO treatment system 3 through a lift pump, the water yield of the first-stage DTRO is 70%, the operating pressure is 45bar, the water yield of the second-stage DTRO is 80%, and the operating pressure is 30 bar; then, the DTRO concentrated solution enters an HPRO treatment system 4, the HPRO permeate enters a two-stage MTRO treatment system, the water yield of the HPRO is 45%, and the operating pressure is 100 bar; the HPRO concentrated solution enters a low-temperature evaporation system for further concentration, the evaporated water enters a two-stage MTRO treatment system, the evaporated mother liquor enters solidification equipment, the water yield of the evaporation system is 80%, and the water content of the mother liquor is about 50%; the HPRO permeate and the evaporated effluent enter two-stage DTRO reverse osmosis treatment, the water yield of the MTRO is 90%, the operating pressure is 30bar, in order to ensure that the effluent further reaches the standard, the water produced by the MTRO is treated by ion exchange resin, the COD (chemical oxygen demand) of the effluent reaches 5.19mg/L, the ammonia nitrogen reaches 6.34mg/L, the total nitrogen reaches 16.4mg/L, and the total nitrogen is far lower than the second requirement of the pollution control standard of a domestic garbage landfill (GB 16889-2008); the low-temperature evaporation mother liquor enters curing equipment for curing, cement and lime are adopted as curing agents, and the adding ratio is 0.3: 1, after mixing and stirring for 15 minutes generally, conveying the mixture to a mold through a conveyor for solidification and molding; the water content of the cured product is 29 percent, the total copper is 0.02mg/L, the total zinc is 0.001mg/L, the total lead is 0.02mg/L, the total chromium is 0.01mg/L, the hexavalent chromium is 0.001mg/L, the mercury is 0.003ug/L, the beryllium is 0.05ug/L, the barium is not detected, the total nickel is 0.01mg/L, the silver is 0.01mg/L, the total arsenic is 0.1ug/L, the selenium is 0.1ug/L, and the water content is far lower than the requirement of the pollution control standard of a domestic garbage landfill (GB 16889-2008) table.
Example 4
A household garbage landfill in inner Mongolia province belongs to old garbage landfill, and the garbage leachate of the garbage landfill has the following water quality:
as can be seen from Table 3, the landfill leachate has high COD, high ammonia nitrogen and high conductivity, and is difficult to reach the standard by adopting the conventional biochemical treatment and membrane treatment process.
The processing system and the method provided by the embodiment 1 of the invention are adopted for processing:
firstly, the landfill leachate of a regulating reservoir 1 enters a two-stage DTRO treatment system 3 through a lift pump, the water yield of the first-stage DTRO is 65%, the operating pressure is 50bar, the water yield of the second-stage DTRO is 90%, and the operating pressure is 35 bar; then, the DTRO concentrated solution enters an HPRO treatment system 4, the HPRO permeate enters a two-stage MTRO treatment system, the water yield of the HPRO is 45%, and the operating pressure is 110 bar; the HPRO concentrated solution enters an MVR evaporation system for further concentration, the evaporated water enters a two-stage MTRO treatment system, the evaporated mother solution enters solidification equipment, the water yield of the evaporation system is 90%, and the water content of the mother solution is about 40%; the HPRO permeate and the evaporated effluent enter two-stage MTRO reverse osmosis treatment, the water yield of the MTRO is 90%, the operating pressure is 35bar, and in order to ensure that the effluent further reaches the standard, the water produced by the MTRO is treated by ion exchange resin; COD of the effluent reaches 4.51mg/L, ammonia nitrogen reaches 4.22mg/L, and total nitrogen reaches 10.4mg/L, which is far lower than the requirements of table two of the pollution control standards of municipal solid waste landfill (GB 16889-2008); the low-temperature evaporation mother liquor enters curing equipment for curing, cement and lime are adopted as curing agents, and the adding ratio is 0.2: 1, after mixing and stirring for 20 minutes generally, conveying the mixture to a mold through a conveyor for solidification and molding; the water content of the cured product is 28 percent, the total copper is 0.03mg/L, the total zinc is 0.004mg/L, the total lead is 0.05mg/L, the total chromium is 0.05mg/L, the hexavalent chromium is 0.007mg/L, the mercury is 0.01ug/L, the beryllium is 0.1ug/L, the barium is not detected, the total nickel is 0.02mg/L, the silver is 0.02mg/L, the total arsenic is 0.2ug/L, the selenium is 0.1ug/L, and the water content is far lower than the requirement of the pollution control standard of a domestic garbage landfill (GB 16889-2008) table I.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an old garbage landfill leachate full-quantization processing system which characterized in that: comprises a regulating tank, a two-stage DTRO treatment system, an HPRO treatment system, an evaporator, a solidification device and a permeate treatment system; the regulating tank is communicated with a liquid inlet of the two-stage DTRO treatment system; a concentrated solution outlet of the two-stage DTRO treatment system is communicated with a liquid inlet of the HPRO treatment system; the permeate liquid of HPRO processing system export with permeate liquid processing system intercommunication, HPRO processing system's concentrate export with the inlet of evaporimeter intercommunication, the evaporation mother liquor export of evaporimeter with solidification equipment's inlet intercommunication, the evaporation effluent outlet of evaporimeter with permeate liquid processing system intercommunication.
2. The full-quantitative treatment system for percolate of the aged refuse landfill claim 1, which is characterized in that: permeate liquid processing system includes two-stage RO processing system, HPRO processing system's permeate liquid export and evaporation effluent export all with two-stage RO processing system's inlet intercommunication, two-stage RO processing system's concentrate export with HPRO processing system's inlet intercommunication.
3. The full-quantitative treatment system for percolate of the aged refuse landfill claim 2, which is characterized in that: the permeate liquid treatment system further comprises an ion exchange resin device, and the permeate liquid outlet of the two-stage RO treatment system is communicated with the liquid inlet of the ion exchange resin device.
4. The full-quantitative treatment system for percolate of the aged refuse landfill claim 2, which is characterized in that: the two-stage RO treatment system comprises a first-stage RO treatment unit and a second-stage RO treatment unit, a permeate outlet of the HPRO treatment system and an evaporation water outlet of the evaporation system are both communicated with a liquid inlet of the first-stage RO treatment unit, and a concentrated liquid outlet of the first-stage RO treatment unit is communicated with a liquid inlet of the second-stage RO treatment unit; and the concentrated solution outlet of the first-stage RO treatment unit and the concentrated solution outlet of the second-stage RO treatment unit are both communicated with the liquid inlet of the HPRO treatment system.
5. The full-quantitative treatment system for percolate of the aged refuse landfill claim 1, which is characterized in that: the solidification device comprises a mixing stirrer and a curing agent bin, and evaporation mother liquor outlets of the curing agent bin and the evaporator are connected with the mixing stirrer.
6. The full-quantitative treatment system for percolate of the aged refuse landfill claim 1, which is characterized in that: the two-stage DTRO treatment system comprises a one-stage DTRO treatment unit and a two-stage DTRO treatment unit, wherein a permeate liquid outlet of the MBR treatment system is communicated with a liquid inlet of the one-stage DTRO treatment unit, a permeate liquid outlet of the one-stage DTRO treatment unit is communicated with a liquid inlet of the two-stage DTRO treatment unit, and a concentrated liquid outlet of the one-stage DTRO treatment unit is communicated with a concentrated liquid outlet of the two-stage DTRO treatment unit and is communicated with a liquid inlet of the HPRO treatment system.
7. The full-quantitative treatment system for percolate of the aged refuse landfill claim 6, which is characterized in that: and a permeate liquid outlet of the secondary DTRO treatment unit is communicated with an inlet of the degassing tower, and permeate liquid is treated by the degassing tower and then is discharged after reaching the standard.
8. A full-quantitative treatment method for percolate of an old refuse landfill is characterized by comprising the following steps:
1) treating the percolate in the regulating tank in a two-stage DTRO treatment system to obtain DTRO permeate and DTRO concentrated solution, and treating the DTRO permeate by a degassing tower to reach the standard and discharging;
2) the DTRO concentrated solution enters an HPRO treatment system for treatment to obtain HPRO permeate solution and HPRO concentrated solution, the HPRO concentrated solution enters an evaporator for further concentration to obtain evaporated water and evaporated mother liquor, the evaporated mother liquor enters a solidification device for solidification, and the obtained solidified product is safely buried;
3) the HPRO permeate and the evaporated effluent enter a two-stage RO treatment system for further optimization to obtain RO permeate and RO concentrated solution, and the RO concentrated solution returns to the HPRO treatment system for treatment again;
4) and treating the RO permeate by adopting an ion exchange resin device, and then discharging the treated RO permeate after reaching the standard.
9. The full-quantitative treatment method of the percolate of the old refuse landfill claim 8, which is characterized in that: in the step 2), before the DTRO concentrated solution enters an HPRO treatment system, the pH value of the DTRO concentrated solution is adjusted to 4-6, and then the DTRO concentrated solution enters the HPRO treatment system for HPRO treatment.
10. The full-quantitative treatment method of the percolate of the old refuse landfill claim 8, which is characterized in that: in the step 2), the evaporation mother liquor enters a mixing stirrer of a curing device, and a curing agent is added for curing; the curing agent comprises cement and lime, and the adding ratio of the cement to the lime is 0.1-0.5: 1.
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