CN107840537A - Method for treating garbage percolation liquid and system - Google Patents
Method for treating garbage percolation liquid and system Download PDFInfo
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- CN107840537A CN107840537A CN201711105548.2A CN201711105548A CN107840537A CN 107840537 A CN107840537 A CN 107840537A CN 201711105548 A CN201711105548 A CN 201711105548A CN 107840537 A CN107840537 A CN 107840537A
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- 239000007788 liquid Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 38
- 238000005325 percolation Methods 0.000 title claims abstract description 35
- 238000000909 electrodialysis Methods 0.000 claims abstract description 154
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 146
- 238000005374 membrane filtration Methods 0.000 claims abstract description 59
- 239000013505 freshwater Substances 0.000 claims abstract description 46
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 150000003839 salts Chemical class 0.000 claims abstract description 25
- 238000002425 crystallisation Methods 0.000 claims abstract description 21
- 230000008025 crystallization Effects 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 16
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000013078 crystal Substances 0.000 claims abstract description 14
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims abstract description 14
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 7
- 238000001704 evaporation Methods 0.000 claims description 20
- 230000008020 evaporation Effects 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 2
- 239000000149 chemical water pollutant Substances 0.000 claims 2
- 241000370738 Chlorion Species 0.000 claims 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- 238000005352 clarification Methods 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 238000007781 pre-processing Methods 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 6
- 239000002351 wastewater Substances 0.000 abstract description 5
- 239000007787 solid Substances 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 3
- 241000196324 Embryophyta Species 0.000 description 29
- 239000000243 solution Substances 0.000 description 29
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- 239000005416 organic matter Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 208000028659 discharge Diseases 0.000 description 6
- 239000000706 filtrate Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000000502 dialysis Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000002906 microbiologic effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 125000001477 organic nitrogen group Chemical group 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- WJEIYVAPNMUNIU-UHFFFAOYSA-N [Na].OC(O)=O Chemical compound [Na].OC(O)=O WJEIYVAPNMUNIU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- -1 silicon ions Chemical class 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- 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
- C02F2001/007—Processes including a sedimentation step
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- 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
- C02F2101/101—Sulfur compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- 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
- C02F2101/20—Heavy metals or heavy metal compounds
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- C02F2101/30—Organic compounds
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- C02F2103/06—Contaminated groundwater or leachate
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- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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Abstract
The invention discloses a kind of method for treating garbage percolation liquid and system, method for treating garbage percolation liquid includes S1, pretreatment removal suspension, heavy metal, sulfate ion, calcium ion and magnesium ion therein is carried out to percolate, obtains clarified solution；S2, pH readjustments, filtering are carried out to clarified solution, remove remaining suspension, obtain SDI<3 filter liquor；S3, electrodialysis process is carried out to filter liquor, obtain electrodialysis concentrated water and electrodialysis fresh water；S4, electrodialysis fresh water is carried out to biochemical, membrane filtration processing, acquisition membrane filtration concentrated water and membrane filtration production water；S5, electrodialysis concentrated water and membrane filtration concentrated water be evaporated crystallization treatment, obtain crystal salt and recycle-water.The processing such as the technique that the present invention is combined by pretreatment+filtering+electrodialysis+biochemistry+evaporative crystallization is concentrated to percolate, separation of solid and liquid, obtain recycling crystal salt and recycle-water, wastewater zero discharge and resource reutilization are realized, it is environmentally friendly, it is with a wide range of applications.
Description
Technical field
The present invention relates to technical field of waste water processing, more particularly to a kind of zero-emission and crystal salt recycling realized
Method for treating garbage percolation liquid and system.
Background technology
Now with the raising of discharging standards, percolate zero discharge treatment also gradually spreads out implementation.It is existing
Percolate Zero-discharge treating process generally comprise anaerobic digestion (reduction organic concentration), biochemical treatment (removal ammonia nitrogen),
Film thickening filtration (with various types of films, carry out concentration, obtain high salt concentrate) and evaporating, concentrating and crystallizing processing, crystallization
Concentrate afterwards carries out separation of solid and liquid with crystal grain, and mother liquor returns to liquid pool or continues evaporative crystallization, and it is dry that crystal carries out dehydration
It is dry, finally obtain purified water and meet the product salt of industrial salt standard.The characteristics of above-mentioned technique, is：Pass through biochemical treatment
Journey organics removal and ammonia nitrogen, by pollutants such as membrane filtration processes heavy-metal ion removal, hardness, silicon ions, pass through evaporation
Salinity based on sodium chloride and potassium chloride is converted into solid by crystallization, and discharge is separated from waste water, reaches following effect：Make to give up
Water qualified discharge, realize the recycling of waste water.
However, above-mentioned technique has the following disadvantages：(1) realize the biochemical system of biochemical treatment has clearly to water inlet salinity
It is required that for high saliferous percolate, biochemical system can not be handled effectively so that Waste Water Treatment can not be transported steadily in the long term
OK；The methods of passing through dilution, which reduces biochemical water inlet salt content, can then greatly improve the operating cost of subsequent technique.(2) reverse osmosis membrane
Concentration systems operating pressure is high, salt content (TDS) can only be concentrated into 50000mg/L or so, the rate of recovery of water is low, and energy consumption is big.
(3) COD removal efficiency is low, and organic matter is contained in vaporizing raw liquor, influences product salt quality
The content of the invention
The technical problem to be solved in the present invention is, there is provided a kind of rubbish for realizing zero-emission and crystal salt recycling
Leachate processing method and system.
The technical solution adopted for the present invention to solve the technical problems is：A kind of method for treating garbage percolation liquid is provided, wrapped
Include following steps：
S1, percolate is carried out pretreatment remove suspension therein, heavy metal, sulfate ion, calcium ion and
Magnesium ion, obtain clarified solution；
S2, pH readjustments, filtering are carried out to the clarified solution, remove remaining suspension, obtain SDI<3 filter liquor；
S3, electrodialysis process is carried out to the filter liquor, obtain electrodialysis concentrated water and electrodialysis fresh water；
S4, the electrodialysis fresh water is carried out to biochemical, membrane filtration processing, acquisition membrane filtration concentrated water and membrane filtration production water；
S5, the electrodialysis concentrated water and membrane filtration concentrated water be evaporated crystallization treatment, obtain crystal salt and recycle-water.
Preferably, step S1 includes：
S1.1, toward sodium hydroxide is added in the percolate, the pH of percolate is adjusted to 11-11.5；
S1.2, sodium carbonate is added, stirring makes it fully be reacted in percolate；
S1.3, supernatant is taken after standing, obtain clarified solution.
Preferably, in step S1, flow of inlet water when percolate pre-processes is 50-200m3/d；Wherein, calcium ion
Concentration is 500-3000mg/L, magnesium ion concentration 500-1200mg/L, sulfate ion concentration 100-500mg/L, carbonic acid
Hydrogen radical ion concentration is 3000-5000mg/L, chlorine ion concentration 7000-15000mg/L；PH value is 7.0-9.0, and COD is
5000-15000mg/L；
In the clarified solution of acquisition, calcium ion concentration ﹤ 50mg/L, magnesium ion concentration ﹤ 10mg/L.
Preferably, in step S2, the pH of the clarified solution is first pulled back into 8-8.5, then after being adjusted back using tubular membrane to pH
Clarified solution filtered, to obtain the filter liquor；Or
First the clarified solution is filtered using tubular membrane, then pH is pulled back into 8-8.5, obtains the filter liquor.
Preferably, in step 3, electrodialysis concentrated water of the salinity higher than 15%, electrodialysis of the salinity less than 1.2% are obtained
Fresh water.
Preferably, in step S4, in addition to：
The electrodialysis concentrated water is aoxidized, filtration treatment.
The present invention also provides a kind of garbage percolation liquid treating system, including the pretreatment pre-processed to percolate
Pond, the clarified solution for obtaining pretreatment carry out the filter of filtration treatment, will filter the filter liquor progress electrodialysis process of acquisition
Electrodialysis plant, successively by electrodialysis obtain electrodialysis fresh water carry out biochemical treatment and membrane filtration processing biochemical treatment fill
The membrane filtration concentrated water and the electrodialysis concentrated water of electrodialysis acquisition put with film filter and obtain membrane filtration processing are steamed
Send out the evaporator of crystallization treatment；
The pretreatment pool, filter, electrodialysis plant, biochemical treatment apparatus, film filter and evaporator are successively
Connection.
Preferably, the garbage percolation liquid treating system also includes reuse tank；
The film filter connects the reuse tank, and membrane filtration production water is delivered into the reuse tank；
The evaporator connects the reuse tank, and the recycle-water that evaporative crystallization processing obtains is back into the reuse tank.
Preferably, the garbage percolation liquid treating system also includes pH regulating reservoirs；The pH regulating reservoirs are connected to described pre-
Between processing pond and filter, or it is connected between the filter and electrodialysis plant.
Preferably, the electrodialysis plant has two outlets, respectively exports the first outlet of electrodialysis concentrated water and defeated
Go out the second outlet of electrodialysis fresh water；
The garbage percolation liquid treating system also includes electrodialysis concentrated water pond and electrodialysis fresh water pond；The electrodialysis concentrated water
Pond is connected with the first outlet, and the electrodialysis fresh water pond is connected with the second outlet.
Preferably, the garbage percolation liquid treating system also includes evaporation former pond；The import point of the evaporation former pond
The electrodialysis plant and film filter are not connected, receive electrodialysis concentrated water from the electrodialysis plant and from described
The membrane filtration concentrated water of film filter；The outlet of the evaporation former pond connects the evaporator, by the electrodialysis concentrated water of reception
The evaporator is delivered to membrane filtration concentrated water.
Beneficial effects of the present invention：The technique being combined by pretreatment+filtering+electrodialysis+biochemistry+evaporative crystallization is to rubbish
Rubbish percolate is concentrated, the processing such as separation of solid and liquid, obtains recycling crystal salt and recycle-water, realize wastewater zero discharge and
Resource reutilization, it is environmentally friendly, it is with a wide range of applications.
In garbage percolation liquid treating system, combined using electrodialysis+biochemical process, reduce biochemical water inlet salinity, no
Increase the processing water of biochemical treatment, the stability of biochemical treatment operation is improved, at the salt for reducing biochemical treatment on the whole
Manage load；Add the raw water salinity into evaporator, improve evaporation efficiency, reduce Load Evaporator and overall operation into
This.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the schematic flow sheet of the method for treating garbage percolation liquid of one embodiment of the invention；
Fig. 2 is the structural representation of the garbage percolation liquid treating system of one embodiment of the invention.
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now compares accompanying drawing and describe in detail
The embodiment of the present invention.
With reference to Fig. 1, the method for treating garbage percolation liquid of one embodiment of the invention, it may include following steps：
S1, percolate is carried out pretreatment remove suspension therein, heavy metal, sulfate ion, calcium ion and
Magnesium ion, obtain clarified solution.
Wherein, percolate is the refuse landfill diffusate of high saliferous.Pretreatment is mainly adjusted and flocculated by pH
Precipitation removes suspension, heavy metal, sulfate ion, calcium ion and magnesium ion therein.
Specifically, the pretreatment may include：
S1.1, toward sodium hydroxide is added in percolate, continuously stir, the pH of percolate be adjusted to 11-11.5.
S1.2, sodium carbonate is added, stirring makes it fully be reacted in percolate；Calcium ion in percolate can
Precipitation of calcium carbonate is formed with sodium carbonate.
S1.3, supernatant is taken after standing, obtain the clarified solution for meeting subsequent filter processing requirement.
Preferably, in the present embodiment, flow of inlet water when percolate pre-processes is 50-200m3/ d (cubic meter/
My god)；Wherein, calcium ion concentration 500-3000mg/L, magnesium ion concentration 500-1200mg/L, sulfate ion concentration are
100-500mg/L, bicarbonate ion concentration 3000-5000mg/L, chlorine ion concentration 7000-15000mg/L；PH value is
7.0-9.0, COD (COD) are 5000-15000mg/L.
In the clarified solution of acquisition, calcium ion concentration ﹤ 50mg/L, magnesium ion concentration ﹤ 10mg/L.
S2, pH readjustments, filtering are carried out to clarified solution, remove remaining suspension (SS), obtain filter liquor.Filter liquor
SDI (pollution index)<3, meet the inflow requirement of follow-up electrodialysis process.
In a kind of embodiment of the step, first pass through addition acid solution (such as hydrochloric acid) and the pH of clarified solution is pulled back into 8-
8.5.Clarified solution after pH is adjusted back carries out refined filtration processing by tubular membrane, and calcium ion, magnesium ion are further removed by refined filtration
Deng the SDI controls in clarified solution (filter liquor of acquisition) below 3, to meet the inflow requirement of follow-up electrodialysis process.
In the another embodiment of the step, refined filtration processing is first carried out to clarified solution using tubular membrane, entered by refined filtration
One step removal calcium ion therein, magnesium ion etc., add acid solution (such as hydrochloric acid) and pH is pulled back into 8-8.5, obtain SDI<3
Filter liquor.
S3, electrodialysis process is carried out to filter liquor, obtain electrodialysis concentrated water and electrodialysis fresh water.
Wherein, electrodialysis process mainly carries out the salinities such as salt concentration desalt processing, the sodium chloride in filter liquor to filter liquor
Be enriched in electrodialysis concentrated water, organic matter is enriched in electrodialysis fresh water, so as to obtain salinity higher than 18% electrodialysis concentrated water and
Salinity is less than 1.2% electrodialysis fresh water.The producing water ratio of electrodialysis fresh water is higher than 60%.In electrodialysis process, pass through one
One section of batch (-type) circular treatment of level is carried out, and electrodialysis concentrated water electrical conductivity reaches 150-170mS/cm, electrodialysis fresh water electrical conductivity ﹤
10mS/cm。
S4, electrodialysis fresh water is carried out to biochemistry, membrane filtration processing, remove the organic matter and ammonia nitrogen in electrodialysis fresh water, obtain
Obtain membrane filtration concentrated water and membrane filtration production water.
In the step, biochemical principle is the assimilation using microorganism, remove organic matter in electrodialysis fresh water and
The pollutants such as ammonia nitrogen.Its concrete operations is：Using me.mbrane bioreactor, it is made up of denitrification and de-nitrification unit；In de-nitrification unit
The aerobic microbiological of high activity, make the organic pollution of bio-degradable in electrodialysis fresh water almost complete in de-nitrification unit
Ammonia nitrogen and organic nitrogen, are oxidized to nitrate by degraded；Nitrate reduction is discharged into nitrogen in denitrification unit.Membrane filtration is main
Using film filter, the sodium chloride in the electrodialysis fresh water Jing Guo biochemical treatment is retained into membrane filtration concentrated water wherein, output
Membrane filtration concentrated water and membrane filtration production water.
Wherein, the salinity of membrane filtration concentrated water is higher than 5%, and membrane filtration production water meets recycle-water requirement, collects and is used as back
Recycled with water.
S5, electrodialysis concentrated water and membrane filtration concentrated water be evaporated crystallization treatment so that salinity therein is with crystal salt shape
Formula separates out, obtain can the crystal salt that utilizes of renewable resources and recycle-water (condensed water obtained after evaporative crystallization processing), realize zero
Discharge.
In addition, in step s 4, in addition to：
Electrodialysis concentrated water is aoxidized, filtration treatment；COD in the production water of acquisition<500mg/L, ammonia nitrogen concentration<10mg/
L.Specifically, the oxidants such as sodium hypochlorite are added toward electrodialysis concentrated water, using the oxidisability of oxidant, destroyed in electrodialysis concentrated water
Organic matter；Electrodialysis concentrated water after being aoxidized using micro-filtrate membrane filtration, retains suspension therein.
The production water that electrodialysis concentrated water is oxidized, filtering obtains mixes with membrane filtration concentrated water again carries out evaporative crystallization processing.
As shown in Fig. 2 the garbage percolation liquid treating system of one embodiment of the invention, including the pretreatment pool being sequentially connected
10th, filter 20, electrodialysis plant 30, biochemical treatment apparatus 40, film filter 50 and evaporator 60.Above-mentioned each device it
Between can pass through pipeline realize connection.
Wherein, pretreatment pool 10 is used to accommodate percolate and pre-process percolate, removes therein
Suspension, heavy metal, sulfate ion, calcium ion and magnesium ion etc., and the clarified solution obtained after processing is delivered to filter
20.Clarified solution is carried out filtration treatment by filter 20, removes wherein remaining suspension, and the filter liquor obtained after filtering is defeated
Deliver to electrodialysis plant 30.Filter liquor is carried out electrodialysis process by electrodialysis plant 40, obtains electrodialysis concentrated water and electrodialysis is light
Water, and electrodialysis fresh water is delivered to biochemical treatment apparatus 40, electrodialysis concentrated water can be delivered to evaporator 60.Biochemical treatment apparatus
40 and film filter 50 biochemical, membrane filtration processing is carried out to electrodialysis concentrated water successively, remove the organic matter in electrodialysis fresh water
And ammonia nitrogen, the membrane filtration concentrated water of acquisition are delivered to evaporator 60, the membrane filtration production water of acquisition can be used as recycle-water to recycle.Evaporation
Device 60 is evaporated crystallization treatment to electrodialysis concentrated water and membrane filtration concentrated water, and obtaining can the crystal salt that utilizes of renewable resources and reuse
Water.
Specifically, pretreatment pool 10 may include pond body and the chemicals dosing plant of alkaline agent added toward pond body；Chemicals dosing plant can be set
Put above pond body, can be by Automatic Dosing mode toward adding appropriate alkaline agent in pond body；Alkaline agent includes sodium hydroxide, carbonic acid
Sodium.The water side connection filter 20 of pond body, the water inlet end of pond body can connect collecting pit 70；Collecting pit 70 receives percolate
And it is delivered to predetermined flow of inlet water in the pond body of pretreatment pool 10.
The preferred tubular type film filter of filter 20, refined filtration processing is carried out to clarified solution, further removes calcium ion, magnesium ion
Deng filter liquors of the output SDI below 3, to meet the inflow requirement of follow-up electrodialysis process.
Due to adding alkaline agent in pretreatment, obtained clarified solution is in strong basicity, therefore is also needed before filtration or after filtering
Carry out pH readjustments.On the other hand, garbage percolation liquid treating system may also include pH regulating reservoirs 80, pretreatment pool 10 and mistake are attached to
Between filter 20 or filter 20 output end, the clarified solution that pretreatment pool 10 exports first adjusts back in the pH regulating reservoirs 80 through pH
After enter back into filter 20.PH regulating reservoirs 80 are provided with chemicals dosing plant, and acid solution (hydrochloric acid) is added into clarified solution or filter liquor to adjust
Save its pH to 8-8.5.
In the present embodiment, one first force (forcing) pump 21 is provided between the entrance point and pretreatment pool 10 of filter 20, first adds
Clarified solution is pressurizeed and is sent into filter 20 by press pump 21.PH regulating reservoirs 80 are connected between filter 20 and electrodialysis plant 30,
Connected respectively with the port of export of filter 20 and the entrance point of electrodialysis plant 30.The filtrate collection that filter 20 exports is in pH
In regulating reservoir 80, electrodialysis plant 30 is delivered to after pH is adjusted back.
PH regulating reservoirs 80 and electrodialysis plant 30 can be provided with one second force (forcing) pump 81, and filter liquor is pressurizeed and is sent into electrodialysis dress
Put 30.
Electrodialysis plant 30 receives the filter liquor from pH regulating reservoirs 80, and salt concentration desalt processing is carried out to filter liquor, with
Obtain the electrodialysis fresh water of electrodialysis concentrated water of the salinity higher than 18% and salinity less than 1.2%.In electrodialysis plant 30, adopt
Desalt processing module is concentrated by the use of homogeneous membrane electric dialyzator as salt, is carried out by one section of batch (-type) circular treatment of one-level, makes electric osmose
The electrical conductivity of analysis concentrated water reaches 150-170mS/cm, electrodialysis fresh water electrical conductivity ﹤ 10mS/cm.
Electrodialysis plant 30 has two outlets, respectively first outlet and second outlet, first outlet and second outlet
Electrodialysis concentrated water and electrodialysis fresh water are exported respectively.The first outlet connection evaporator 60 of electrodialysis concentrated water is exported, by electrodialysis
Concentrated water delivers to evaporator 60 and carries out subsequent evaporation crystallization treatment.Export the second outlet connection biochemical treatment apparatus of electrodialysis fresh water
40, electrodialysis fresh water enters film filter 50 after biochemical treatment apparatus 40 carries out biochemical treatment, is removed by membrane filtration
Organic matter and ammonia nitrogen in electrodialysis fresh water, obtain membrane filtration concentrated water and membrane filtration production water.
Wherein, the salinity of membrane filtration concentrated water is higher than 5%, and membrane filtration production water meets recycle-water requirement, collects and is used as back
Recycled with water.Membrane filtration concentrated water is delivered to evaporator 60 and carries out subsequent evaporation crystallization treatment by film filter 50.
Further, garbage percolation liquid treating system may also include electrodialysis concentrated water pond 31 and electrodialysis fresh water pond 32.Electricity
Dialysis concentrated water pond 31 is connected with the first outlet of electrodialysis plant 30, collects the electrodialysis concentrated water from electrodialysis plant 30；Electricity
Dialysis fresh-water pool 32 is connected with the second outlet of electrodialysis plant 30, collects the electrodialysis fresh water from electrodialysis plant 30.
Specifically, the first outlet of the entrance point connection electrodialysis plant 30 in electrodialysis concentrated water pond 31, port of export connection are steamed
Send out device 60.The second outlet of the entrance point connection electrodialysis plant 30 in electrodialysis fresh water pond 32, port of export connection biochemical treatment dress
Put 40 entrance point.The port of export of biochemical treatment apparatus 40 then connects the entrance point of film filter 50, film filter 50
The port of export connects evaporator 60, and membrane filtration concentrated water is delivered into evaporator 60.
Add in addition, can also be provided with one the 3rd between the port of export of biochemical treatment apparatus 40 and the entrance point of film filter 50
Press pump 41, film filter 50 is delivered into the electrodialysis fresh water pressurization after biochemical treatment.
Alternatively, biochemical treatment apparatus 40 uses me.mbrane bioreactor, and it includes the de-nitrification unit to connect and denitrification
Unit.Aerobic microbiological (high activity) is provided with de-nitrification unit makes the organic pollution of the bio-degradable in electrodialysis fresh water exist
It is almost degradable in de-nitrification unit, ammonia nitrogen and organic nitrogen are oxidized to nitrate；In denitrification unit by nitrate reduction into
Nitrogen is discharged.Membrane filtration is dense wherein by the sodium chloride retention in the electrodialysis fresh water Jing Guo biochemical treatment for film filter 50
Water, export membrane filtration concentrated water and membrane filtration production water.
Evaporator 60 receives the electrodialysis concentrated water from electrodialysis concentrated water pond 31 and the membrane filtration from film filter 50
Concentrated water, crystallization treatment is evaporated to it so that salinity therein is separated out with crystalline salt form, obtains crystal salt and recycle-water.
Further, garbage percolation liquid treating system may also include evaporation former pond 90, the import point of evaporation former pond 90
Not Lian Jie electrodialysis plant 30 and film filter 50, by the electrodialysis concentrated water from electrodialysis plant 30 and from membrane filtration fill
Put 50 membrane filtration concentrated water to be collected in wherein, then be delivered to evaporator 60.In the present embodiment, evaporation former pond 90 passes through electrodialysis
Concentrated water pond 31 connects electrodialysis plant 30.Electrodialysis concentrated water and membrane filtration concentrated water are mixed to form mixing in former pond 90 is evaporated
Liquid.The outlet connection evaporator 60 of former pond 90 is evaporated, one the 4th force (forcing) pump 91 can be provided between the two, after mixed liquor is pressurizeed
It is sent into evaporator 60.
According to processing needs, oxidation filter can be also connected between electrodialysis concentrated water pond 31 and evaporation former pond 90, it is right
Electrodialysis concentrated water carries out oxidation filtration treatment, and the production water of acquisition is delivered in evaporation former pond 90.COD in the production water of acquisition<
500mg/L, ammonia nitrogen concentration<10mg/L.Filter is aoxidized mainly using the oxidisability of the oxidants such as sodium hypochlorite, destroys electric osmose
Analyse dense Organic substance in water；Electrodialysis concentrated water after being aoxidized using micro-filtrate membrane filtration, retains suspension therein.
Further, garbage percolation liquid treating system may also include reuse tank 100.Evaporator 60 connects reuse tank 100, will
The recycle-water (condensed water) that evaporative crystallization processing obtains is back to reuse tank 80.
In addition, film filter 50 also connects reuse tank 100, membrane filtration production water is delivered to reuse tank 100, so as to rubbish
In percolation liquid treating system, the production water for meeting recycle-water requirement for handling acquisition is collected in reuse tank 100, is concentrated again sharp
With.
With reference to above-mentioned garbage percolation liquid treating system, method for treating garbage percolation liquid of the invention can be implemented as follows：
The percolate of collecting pit 70 is with flow of inlet water 50-200m3/ d is from flowing in pretreatment pool 10, in pretreatment pool
The pH of NaON regulation percolates is added in 10 to 11.5, then adds sodium carbonate, continuously stirring makes it fully react, and generates carbon
Sour calcium precipitate, it is fully quiet heavy, sediment is sufficiently separated with supernatant, obtain the clarified solution for meeting follow-up refined filtration processing requirement.
Clarified solution pressurization is entered in tubular type film filter 20, in the filtrate collection pH regulating reservoirs 80 of acquisition, adds salt
Acid adjusts the pH of filtrate to 8.5.
Filter liquor again by pressurize be sent into electrodialysis plant 30 carry out salt concentrate desalt processing, and export electrodialysis concentrated water and
Electrodialysis fresh water.Electrodialysis concentrated water is collected in electrodialysis concentrated water pond 31, and electrodialysis fresh water is collected in electrodialysis fresh water pond 32.
Electrodialysis concentrated water direct current in electrodialysis concentrated water pond 31 extremely evaporates former pond 90；Electric osmose in electrodialysis fresh water pond 32
Fresh water direct current is analysed to biochemical treatment apparatus 40；The bio-chemical effluent of biochemical treatment apparatus 40 enters film filter 50 by pressurization,
The membrane filtration production water that film filter 50 exports enters the storage of reuse tank 80 and recycled, and the membrane filtration concentrated water of output is delivered to evaporation
Former pond 90, and electrodialysis concentrated water are mixed to form mixed liquor wherein.
Mixed liquor in evaporation former pond 90 is evaporated crystallization as the evaporation pressurized evaporator 60 that is lifted into of raw water
Processing.The product (crystal salt) of evaporative crystallization processing carries out recycling, and condensate return to reuse tank 80, which stores, to be recycled.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of method for treating garbage percolation liquid, it is characterised in that comprise the following steps：
S1, percolate is carried out pretreatment remove suspension, heavy metal, sulfate ion, calcium ion and magnesium therein from
Son, obtain clarified solution；
S2, pH readjustments, filtering are carried out to the clarified solution, remove remaining suspension, obtain SDI<3 filter liquor；
S3, electrodialysis process is carried out to the filter liquor, obtain electrodialysis concentrated water and electrodialysis fresh water；
S4, the electrodialysis fresh water is carried out to biochemical, membrane filtration processing, acquisition membrane filtration concentrated water and membrane filtration production water；
S5, the electrodialysis concentrated water and membrane filtration concentrated water be evaporated crystallization treatment, obtain crystal salt and recycle-water.
2. method for treating garbage percolation liquid according to claim 1, it is characterised in that step S1 includes：
S1.1, toward sodium hydroxide is added in the percolate, the pH of percolate is adjusted to 11-11.5；
S1.2, sodium carbonate is added, stirring makes it fully be reacted in percolate；
S1.3, supernatant is taken after standing, obtain clarified solution.
3. method for treating garbage percolation liquid according to claim 1, it is characterised in that in step S1, percolate is pre-
Flow of inlet water during processing is 50-200m3/d；Wherein, calcium ion concentration 500-3000mg/L, magnesium ion concentration 500-
1200mg/L, sulfate ion concentration 100-500mg/L, bicarbonate ion concentration 3000-5000mg/L, chlorion are dense
Spend for 7000-15000mg/L；PH value is 7.0-9.0, COD 5000-15000mg/L；
In the clarified solution of acquisition, calcium ion concentration ﹤ 50mg/L, magnesium ion concentration ﹤ 10mg/L.
4. method for treating garbage percolation liquid according to claim 1, it is characterised in that in step S2, first by the clarification
The pH of liquid pulls back to 8-8.5, then the clarified solution after pH readjustments is filtered using tubular membrane, obtains the filter liquor；Or
First the clarified solution is filtered using tubular membrane, then pH is pulled back into 8-8.5, obtains the filter liquor.
5. method for treating garbage percolation liquid according to claim 1, it is characterised in that in step 3, it is high to obtain salinity
Electrodialysis concentrated water, salinity in 15% are less than 1.2% electrodialysis fresh water.
6. method for treating garbage percolation liquid according to claim 1, it is characterised in that in step S4, in addition to：
The electrodialysis concentrated water is aoxidized, filtration treatment.
A kind of 7. garbage percolation liquid treating system, it is characterised in that including percolate is pre-processed pretreatment pool,
The electricity of electrodialysis process is carried out by the filter for pre-processing the clarified solution progress filtration treatment obtained, by the filter liquor for filtering acquisition
Electrodialysis apparatus, successively by electrodialysis obtain electrodialysis fresh water carry out biochemical treatment and membrane filtration processing biochemical treatment apparatus and
The electrodialysis concentrated water that film filter and the membrane filtration concentrated water for obtaining membrane filtration processing and electrodialysis obtain is evaporated knot
The evaporator of crystalline substance processing；
The pretreatment pool, filter, electrodialysis plant, biochemical treatment apparatus, film filter and evaporator are sequentially connected.
8. garbage percolation liquid treating system according to claim 1, it is characterised in that the garbage percolation liquid treating system
Also include reuse tank；
The film filter connects the reuse tank, and membrane filtration production water is delivered into the reuse tank；
The evaporator connects the reuse tank, and the recycle-water that evaporative crystallization processing obtains is back into the reuse tank.
9. the garbage percolation liquid treating system according to claim 7 or 8, it is characterised in that the landfill leachate treatment
System also includes pH regulating reservoirs；The pH regulating reservoirs are connected between the pretreatment pool and filter, or are connected to described
Between filter and electrodialysis plant；And/or
The electrodialysis plant has two outlets, respectively exports the first outlet and output electrodialysis fresh water of electrodialysis concentrated water
Second outlet；The garbage percolation liquid treating system also includes electrodialysis concentrated water pond and electrodialysis fresh water pond；The electrodialysis
Concentrated water pond is connected with the first outlet, and the electrodialysis fresh water pond is connected with the second outlet.
10. the garbage percolation liquid treating system according to claim 7 or 8, it is characterised in that the landfill leachate treatment
System also includes evaporation former pond；The import of the evaporation former pond connects the electrodialysis plant and film filter respectively,
Receive the electrodialysis concentrated water from the electrodialysis plant and the membrane filtration concentrated water from the film filter；The evaporation is former
The outlet in pond connects the evaporator, and the electrodialysis concentrated water of reception and membrane filtration concentrated water are delivered into the evaporator.
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