CN113683227A - Activating agent for strengthening high-concentration landfill leachate membrane concentrated solution solidified body and application thereof - Google Patents
Activating agent for strengthening high-concentration landfill leachate membrane concentrated solution solidified body and application thereof Download PDFInfo
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- CN113683227A CN113683227A CN202111071262.3A CN202111071262A CN113683227A CN 113683227 A CN113683227 A CN 113683227A CN 202111071262 A CN202111071262 A CN 202111071262A CN 113683227 A CN113683227 A CN 113683227A
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- concentrated solution
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- landfill leachate
- sodium
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- 239000012528 membrane Substances 0.000 title claims abstract description 126
- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 83
- 238000005728 strengthening Methods 0.000 title claims abstract description 19
- 230000003213 activating effect Effects 0.000 title abstract description 16
- 239000003795 chemical substances by application Substances 0.000 title abstract description 16
- 239000012190 activator Substances 0.000 claims abstract description 45
- GIAFURWZWWWBQT-UHFFFAOYSA-N 2-(2-aminoethoxy)ethanol Chemical compound NCCOCCO GIAFURWZWWWBQT-UHFFFAOYSA-N 0.000 claims abstract description 21
- CYDQOEWLBCCFJZ-UHFFFAOYSA-N 4-(4-fluorophenyl)oxane-4-carboxylic acid Chemical compound C=1C=C(F)C=CC=1C1(C(=O)O)CCOCC1 CYDQOEWLBCCFJZ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920002472 Starch Polymers 0.000 claims abstract description 21
- 239000001540 sodium lactate Substances 0.000 claims abstract description 21
- 229940005581 sodium lactate Drugs 0.000 claims abstract description 21
- 235000011088 sodium lactate Nutrition 0.000 claims abstract description 21
- 239000008107 starch Substances 0.000 claims abstract description 21
- 235000019698 starch Nutrition 0.000 claims abstract description 21
- 229920000142 Sodium polycarboxylate Polymers 0.000 claims abstract description 19
- 239000012141 concentrate Substances 0.000 claims description 29
- 239000000203 mixture Substances 0.000 claims description 26
- 238000009472 formulation Methods 0.000 claims description 8
- 239000010865 sewage Substances 0.000 claims description 7
- 239000002351 wastewater Substances 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 abstract description 75
- 230000008020 evaporation Effects 0.000 abstract description 65
- 238000000034 method Methods 0.000 abstract description 65
- 230000008569 process Effects 0.000 abstract description 56
- 239000012452 mother liquor Substances 0.000 abstract description 39
- 239000007788 liquid Substances 0.000 abstract description 15
- 239000010813 municipal solid waste Substances 0.000 abstract description 14
- 238000005265 energy consumption Methods 0.000 abstract description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 abstract description 2
- 230000004913 activation Effects 0.000 abstract description 2
- 239000004480 active ingredient Substances 0.000 abstract description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 abstract description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 abstract description 2
- 235000011151 potassium sulphates Nutrition 0.000 abstract description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 abstract description 2
- 235000011152 sodium sulphate Nutrition 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 90
- 239000002131 composite material Substances 0.000 description 64
- 239000010881 fly ash Substances 0.000 description 37
- 230000000694 effects Effects 0.000 description 31
- 239000000706 filtrate Substances 0.000 description 30
- 239000000843 powder Substances 0.000 description 30
- 150000003839 salts Chemical class 0.000 description 30
- 239000002893 slag Substances 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 26
- 238000007711 solidification Methods 0.000 description 24
- 230000008023 solidification Effects 0.000 description 24
- FPUYSDUWYZEIMA-UHFFFAOYSA-L sodium;iron(2+);oxalate Chemical compound [Na+].[Fe+2].[O-]C(=O)C([O-])=O FPUYSDUWYZEIMA-UHFFFAOYSA-L 0.000 description 23
- 239000000463 material Substances 0.000 description 19
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 17
- 238000003825 pressing Methods 0.000 description 17
- 238000002156 mixing Methods 0.000 description 16
- 238000003756 stirring Methods 0.000 description 16
- 238000001879 gelation Methods 0.000 description 14
- 238000001914 filtration Methods 0.000 description 13
- 229920005552 sodium lignosulfonate Polymers 0.000 description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 12
- OPGYRRGJRBEUFK-UHFFFAOYSA-L disodium;diacetate Chemical compound [Na+].[Na+].CC([O-])=O.CC([O-])=O OPGYRRGJRBEUFK-UHFFFAOYSA-L 0.000 description 11
- 239000002244 precipitate Substances 0.000 description 11
- 239000001632 sodium acetate Substances 0.000 description 11
- 235000017454 sodium diacetate Nutrition 0.000 description 11
- 239000000126 substance Substances 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 230000008901 benefit Effects 0.000 description 7
- 239000012065 filter cake Substances 0.000 description 7
- 238000001223 reverse osmosis Methods 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- QXDMQSPYEZFLGF-UHFFFAOYSA-L calcium oxalate Chemical compound [Ca+2].[O-]C(=O)C([O-])=O QXDMQSPYEZFLGF-UHFFFAOYSA-L 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- 238000011085 pressure filtration Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 230000008719 thickening Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000010413 mother solution Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- MKBNNYRMBCFUSH-UHFFFAOYSA-J sodium;iron(3+);oxalate Chemical compound [Na+].[Fe+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O MKBNNYRMBCFUSH-UHFFFAOYSA-J 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- FOGYNLXERPKEGN-UHFFFAOYSA-N 3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfopropyl)phenoxy]propane-1-sulfonic acid Chemical compound COC1=CC=CC(CC(CS(O)(=O)=O)OC=2C(=CC(CCCS(O)(=O)=O)=CC=2)OC)=C1O FOGYNLXERPKEGN-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003906 humectant Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000001488 sodium phosphate Substances 0.000 description 2
- 229910000162 sodium phosphate Inorganic materials 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 2
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 description 1
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical class [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 229940102253 isopropanolamine Drugs 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 239000010806 kitchen waste Substances 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229910000160 potassium phosphate Inorganic materials 0.000 description 1
- 235000011009 potassium phosphates Nutrition 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Images
Classifications
-
- 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
- C02F1/44—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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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)
Abstract
The invention discloses an activating agent for strengthening a high-concentration landfill leachate membrane concentrated solution solidified body and application thereof, belonging to the field of wastewater treatment. An activator for strengthening the solidified liquid of the membrane-concentrated garbage percolate is chosen from the group consisting of sodium polycarboxylate, diglycolamine, starch and sodium lactate. In the curing process of the activating agent, active ingredients (such as sodium sulfate, potassium sulfate and the like) in the filter residue and the evaporation mother liquor are utilized, and a curing body meeting the landfill requirement is formed through activation, so that the strength of the curing body is greatly improved, the energy consumption of equipment is reduced, and the cost is reduced.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to an activating agent for strengthening a high-concentration landfill leachate membrane concentrated solution solidified body and application thereof.
Background
The landfill leachate has complex components and contains a plurality of toxic and harmful substances, and the environmental and human health are harmed if the landfill leachate is not treated in time. CJJ150-2010 domestic leachate treatment technical Specification establishes a treatment process route of the landfill leachate in 2011, and adopts a combined route of pretreatment, biological treatment and membrane treatment. The combined process of the MBR membrane bioreactor, the RO membrane and the NF membrane has the advantages of simple operation, high interception efficiency and ideal water outlet effect, and is one of the mainstream treatment processes of the landfill leachate in China at present; on the other hand, for the emergency treatment of landfill leachate, the technology of 'pretreatment + DTRO (disc-tube reverse osmosis)' is mostly adopted. The processes all comprise membrane treatment processes, so that certain garbage leachate membrane concentrated solution (hereinafter referred to as concentrated solution) can be generated, and for the former process, as a biochemical unit is arranged at the front section, most of COD and ammonia nitrogen are effectively treated, so that the generated concentrated solution is relatively easy to treat; in the latter process, the whole membrane method is adopted for treatment, and almost all organic matters are transferred into the concentrated solution, so that the concentrated solution has the characteristics of high salt and high organic matters.
At present, the disposal mode of the landfill leachate membrane concentrated solution can be mainly divided into three modes, namely transfer treatment (outward transportation and recharging); second, decrement treatment (reverse osmosis, nanofiltration, evaporation, etc.); thirdly, carrying out innocent treatment (electric flocculation, sedimentation, advanced oxidation and incineration) and the like. The Chinese patent application with the publication number of CN105923850B discloses a treatment process of a landfill leachate membrane concentrated solution, which comprises the steps of flocculation pretreatment, Fenton reaction, electrolysis treatment and Fenton-like reaction, wherein the treatment process is used for treating the concentrated solution by multi-stage technical coupling, the treatment method is relatively complex in process, the conditions are not easy to control, secondary pollution is easy to generate, the concentration of the concentrated solution is not high, and experimental examples show that the COD of the membrane concentrated solution is only 4300-4500 mg/L; publication No. CN111320316A discloses a method for treating a garbage leachate membrane concentrated solution. The treatment method comprises electrocatalytic oxidation, coagulating sedimentation, ultrafiltration and evaporation treatment, wherein only the electrocatalytic oxidation step needs to be carried out for adjusting the pH, and a large amount of H is added2O2Iron salt, the process flow is repeatedThe concentration of organic pollutants in the concentrated solution treated by the process is 4000-10000 mg/L in terms of CODcr, and the hardness is CaCO3The content is more than 1000 mg/L. In the existing industry, as the membrane concentrated solution is recharged for a long time and kitchen waste in partial areas is not treated in a standard way (enters a landfill) to cause the COD concentration and the conductivity of the garbage percolate to be increased, and great impact is caused to the traditional biochemical process, the percolate is usually treated by adopting a whole membrane method, the COD of the produced concentrated solution is more than 20000mg/L, the ammonia nitrogen is more than 3000mg/L, and how to effectively treat the high-concentration garbage percolate membrane concentrated solution becomes a difficult problem in the industry.
Disclosure of Invention
In order to solve the problems in the field, the invention aims to provide an activator for strengthening a solidified body of a high-concentration landfill leachate membrane concentrated solution and application thereof.
The invention provides a treatment process of a high-concentration landfill leachate membrane concentrated solution on the one hand.
The technical scheme of the treatment process of the high-concentration garbage infiltration membrane concentrated solution is as follows:
a process for treating the concentrated liquid of high-concentration garbage leachate membrane includes such steps as pretreating the concentrated liquid of high-concentration garbage leachate membrane with pretreated salt or composite material to decrease the concentration of COD and ammonia nitrogen in said concentrated liquid;
the pretreatment salt is selected from the group consisting of sodium iron oxalate, sodium diacetate, polyaluminium chloride;
the composite material is selected from the group consisting of light burned powder, sodium lignosulfonate, fly ash and slag.
The pretreatment means that the high-concentration landfill leachate membrane concentrated solution is sequentially mixed with pretreatment salt and a composite material;
preferably, the mixing time with the pretreatment salt is 10-60 min, preferably 50 min; the time for mixing the composite material is 5-60 min, preferably 30 min; the mixing time can ensure that the pretreatment reaction is complete and thorough, and can reduce COD or ammonia nitrogen in the high-concentration landfill leachate membrane concentrated solution to the maximum extent;
preferably, the mixing is performed by stirring;
the addition amount of the pretreatment salt is 0.1-1 percent of the mass of the high-concentration landfill leachate membrane concentrated solution, preferably 0.1-0.5 percent;
preferably, the mass ratio of the sodium iron oxalate to the polyaluminium chloride is 1-10: 1, preferably 3: 1, and the positive effect of the mass ratio on the final treatment effect is taken as follows: after the substances are added, calcium oxalate precipitation is firstly generated, the hardness of the precipitate is removed, the precipitate is superior to that of the precipitate removed by a conventional double-alkali method, and the polyaluminium chloride is added, so that the precipitate precipitation is accelerated, part of COD can be removed, the effects of removing hardness and COD and the medicament cost are integrated, and the proportion is most reasonable.
The composite material is selected from one of the following formulas:
the mass ratio is 0.5-3: 1, preferably 1: 1, light calcined powder and fly ash;
the mass ratio is 0.5-5: 1: 0.1 to 0.5, preferably 1: 1: 0.2 of light burning powder, fly ash and sodium lignosulfonate;
the mass ratio is 1-5: 1 preferably, 3: 1 fly ash and slag;
the addition amount of the composite material is 5-30 percent of the mass of the high-concentration landfill leachate membrane concentrated solution, preferably 15-18 percent;
pre-treating the high-concentration landfill leachate membrane concentrated solution, and then performing filter pressing to obtain filtrate and filter residue;
preferably, the mass fraction of the filter residue is 70-90%, preferably 80-85%, and the mass fraction of the filter residue refers to the mass percentage of dry solids in the filter residue in the whole filter residue; the filter residue in this context refers to a filter cake obtained after pressure filtration; although the solid form is apparent, the solid form is not absolutely 100% solid matter, and the inside contains a part of water. The advantage of controlling the mass fraction of the filter residue in the above range is: the filter residues with the mass fraction can be directly mixed with evaporation mother liquor obtained in the subsequent evaporation link in the solidification process, and additional water is not required; if the mass fraction is too high, water needs to be added in the solidification link, and if the mass fraction is too low, the water content is too much, so that the solidification effect is influenced, and the water yield of the concentrated solution is reduced.
Concentrating the filtrate;
the concentration is preferably carried out by heating and evaporating;
preferably, evaporating and concentrating the filtrate to obtain evaporation mother liquor and condensate;
the evaporation mother liquor refers to the liquid left after evaporation, the condensate refers to the liquid obtained after condensation of gas obtained by evaporation and gasification, main pollutants are concentrated in the evaporation mother liquor, and the condensate contains a small part, so that the condensate is required to enter a previous membrane system to ensure that the condensate reaches the standard and is discharged; the membrane system refers to the place where the "high concentration landfill leachate membrane concentrate" of the present invention is initially produced, i.e., the "high concentration landfill leachate membrane concentrate" is the membrane concentrate discharged from the membrane system.
Preferably, the concentration multiple of the filtrate is 8-16 times, preferably 9-11 times; the benefits of using this concentration factor include: (1) taking energy consumption and the water yield of the concentrated solution into consideration, and (2) directly mixing the mother solution at the concentration multiple with the preferable 80-85% of filter residues, so that better mixing property can be ensured, no additional water is required, and the best curing effect can be achieved.
Preferably, the evaporation mother liquor and the filter residue are mixed with an activating agent for solidification to obtain a solidified body;
the activator is selected from the group consisting of diglycolamine, sodium lactate, sodium polycarboxylate, starch; the activator has the functions of: because the composite material used in the pretreatment link has potential gelation performance, the composite material can generate obvious gelation effect after being excited, evaporation mother liquor contains a large amount of sulfate which is also a gelation material activator, the addition of the activator mainly strengthens the gelation effect and ensures the gelation performance of a solidified body in consideration of the water quality fluctuation of a membrane concentrated solution, so that the strength of the generated solidified body is high enough, the integral property of the solidified body is further stabilized, high stability is brought by the high strength of the solidified body during landfill, and the situations of disintegration, leakage or seepage and the like can not occur even if the solidified body is buried underground for a long time.
Preferably, the curing refers to natural condition curing for 7 days;
preferably, the water content of the solidified body is 20-50%, preferably 20-30%; the benefits of using this water cut are: on the premise of considering the curing strength, the preparation process of the cured body has better mixing property;
preferably, the addition amount of the activating agent is 0.1-2%, preferably 0.1-0.18% of the high-concentration landfill leachate membrane concentrate.
The activator is selected from one of the following formulas:
1-8% of sodium polycarboxylate and starch: 1, or diglycolamine and sodium lactate in a ratio of 0.1-1: 1.
the high-concentration landfill leachate membrane concentrated solution treatment process is applied to the treatment of wastewater, sewage and landfill leachate. In a second aspect of the invention, there is provided a pretreatment composition for use in a high concentration landfill leachate membrane concentrate.
The technical scheme of the invention of the pretreatment composition is as follows:
a pretreatment composition for high concentration landfill leachate membrane concentrate comprising: pretreating salt and composite materials;
the pretreatment salt is selected from the group consisting of sodium iron oxalate, sodium diacetate, polyaluminium chloride;
the composite material is selected from the group consisting of light burned powder, sodium lignosulfonate, fly ash and slag.
The composite material is selected from one of the following formulas:
the mass ratio is 0.5-3: 1, light calcined powder and fly ash;
the mass ratio is 0.5-5: 1: 0.1-0.5 parts of light burning powder, fly ash and sodium lignosulfonate; or the like, or, alternatively,
the mass ratio is 1-5: fly ash and slag of 1.
The composite material is selected from one of the following formulas:
the mass ratio is 1: 1, light calcined powder and fly ash;
the mass ratio is 1: 1: 0.2 of light burning powder, fly ash and sodium lignosulfonate; or the like, or, alternatively,
the mass ratio is 3: fly ash and slag of 1.
The light calcined powder has the following functions in the composite material: (1) the light burning powder can adsorb COD in the percolate; (2) the light calcined powder has potential gelling property and can be used as a main material of a gelling material;
the fly ash has the following functions in the composite material: the adhesive mainly has adsorption performance and partial potential gelation performance;
the sodium lignin sulfonate has the following functions in the composite material: after the composite material and the concentrated solution are stirred, a filtering step is carried out, and the filtering speed can be obviously increased by adding the sodium lignosulfonate;
the function of the slag in the composite material is as follows: (1) the slag has potential gelling property and can also be used as a main material of a gelling material; (2) compared with light calcined powder and fly ash, the slag has coarser granularity, can effectively prevent hardening when forming a filter cake layer, and improves the filtering speed.
The addition amount of the composite material is 5-30% of the mass of the high-concentration landfill leachate membrane concentrated solution.
The addition amount of the composite material is 15-18% of the mass of the high-concentration landfill leachate membrane concentrated solution.
The pretreatment salt is selected from: sodium iron oxalate, or sodium diacetate, or a mixture of sodium iron oxalate and polyaluminium oxide.
Wherein the sodium diacetate can react with pollutants in the membrane concentrated solution to generate precipitate which can absorb certain COD and ammonia nitrogen. Except that can get rid of COD and ammonia nitrogen effect to a certain extent, sodium diacetate still has the effect of mould proof, disinfection, sterilization, and the concentrate after the preliminary treatment can advance to go into a holding vessel, gets into subsequent evaporation process in the holding vessel again, even consequently during overhaul of the equipments or the parking, the concentrate in the holding vessel can not mildew yet, breed bacterium or alga, has improved the operational environment.
The sodium iron oxalate can generate calcium oxalate precipitation together with pollutants in the membrane concentrated solution, and the generated calcium oxalate precipitation can adsorb COD and ammonia nitrogen to a certain degree.
The mixture of the sodium iron oxalate and the polymeric alumina can also react with part of pollutants in the membrane concentrated solution to generate a precipitate, and the precipitate can also absorb certain COD and ammonia nitrogen.
The mass ratio of the sodium iron oxalate to the polymeric alumina in the mixture of the sodium iron oxalate and the polymeric alumina is 1-10: 1.
the mass ratio of the sodium iron oxalate to the polymeric alumina in the mixture of the sodium iron oxalate and the polymeric alumina is 3: 1.
the addition amount of the pretreatment salt is 0.1-1%, preferably 0.1-0.5% of the mass of the high-concentration landfill leachate membrane concentrated solution.
The pretreatment composition for the high-concentration landfill leachate membrane concentrated solution is applied to treatment of landfill leachate, landfill leachate membrane concentrated solution, sewage and wastewater.
The pretreatment salt in the pretreatment composition can remove hardness and part of humic acid in the leachate, the added composite material can adsorb and remove COD and ammonia nitrogen in the leachate, the added composite material is not modified at all, the added amount is large in order to ensure good adsorption effect, and meanwhile, enough composite material can effectively form a filter cake layer during filtration, so that the filtration speed and effect are improved.
The third aspect of the invention provides an activator for strengthening the solidified body of the high-concentration landfill leachate membrane concentrated solution.
The technical scheme of the activator is as follows:
an activator for strengthening a solidified body of a high-concentration landfill leachate membrane concentrated solution is characterized in that the activator is selected from the group consisting of sodium polycarboxylate, diglycolamine, starch and sodium lactate.
The activator is selected from one of the following formulas: 1-8% of sodium polycarboxylate and starch: 1, or diglycolamine and sodium lactate in a ratio of 0.1-1: 1.
wherein the sodium polycarboxylate acts as: adjusting the workability of the filter residue and the mother liquor in the stirring process under high mass concentration, and enhancing the strength of a solidified body;
the role starch plays in activators is: mainly plays a role of a dispersant and also has the functions of thickening and moisturizing. In the operation process, even if the curing system is in a low mass concentration condition, the curing material and the mother liquor are uniformly distributed without sedimentation, and fine particulate matters are prevented from suspending on the upper layer of the curing body to influence the curing effect; the thickening property of the starch means that the viscosity of the curing system can be improved, and the release of gas generated in the curing process can be delayed or prevented.
The function of diglycolamine in activators is: the release of ammonia can be delayed, the mother liquor contains a large amount of ammonium salt, the filter residue contains partial alkaline substances, ammonia can be released in the reaction process, the release degree is related to water quality, diglycolamine is taken as a surface active substance and can be adsorbed on the surface of the filter residue particles to delay the release of ammonia, and the solidified body can not leave air holes on the surface in the later period, so that the effect of improving the strength of the solidified body is indirectly achieved, and in addition, the solidified body also has the moisture-preserving effect.
Sodium lactate in the activator functions as: as the humectant, the solidified body is generally stockpiled under natural conditions after being prepared, when the outdoor temperature is too high, the solidified body loses water too fast and is easy to crack, so that the solidification quality is poor, and the addition of sodium lactate plays a role similar to the conventional concrete watering maintenance.
The activator is selected from one of the following formulas: sodium polycarboxylate and starch in a mass ratio of 8: 1, or, in a mass ratio of 0.2-0.5: 1 diglycolamine: sodium lactate.
The dosage of the activating agent accounts for 0.1 to 2 percent of the mass of the high-concentration landfill leachate membrane concentrated solution.
The mass percentage of the activating agent in the high-concentration landfill leachate membrane concentrated solution is 0.1-0.18%.
The activating agent for strengthening the solidified body of the high-concentration landfill leachate membrane concentrated solution is applied to the treatment of landfill leachate, the high-concentration landfill leachate membrane concentrated solution, sewage and wastewater.
For the high-concentration landfill leachate membrane concentrated solution, sulfuric acid is added in the membrane treatment process and the evaporation process and is finally uniformly distributed in mother liquor in the form of sulfate, the sulfate belongs to a known cementing material excitant, and the composite main material added at the front end has potential cementing property, so that the two materials are mixed in the curing process to exactly excite the cementing property of the composite materials. In order to make up for the defects caused by a single excitation material and further obtain a good gelling effect, a strengthening activator is added in the curing process to ensure that the curing requirement is met.
The invention provides a treatment process of a high-concentration landfill leachate membrane concentrated solution, which is characterized by comprising the following steps of:
(1) pretreatment: sequentially adding pretreatment salt and a composite material into the landfill leachate membrane concentrated solution, and stirring to primarily remove hardness, COD (chemical oxygen demand) and ammonia nitrogen;
(2) and (3) filter pressing: feeding the stirred concentrated solution into a filter pressing system to obtain filtrate and filter residues, feeding the filtrate into a collecting tank, and piling the filter residues for later use;
(3) and (3) evaporation: and (3) the filtrate enters an evaporation system from the collection tank for evaporation concentration, the evaporation mother liquor enters a solidification system, the condensate returns to the membrane treatment system, and the condensate is discharged after reaching the standard.
(4) And (3) curing: and evaporating the mother liquor, adding an activating agent into the filter residue, uniformly stirring to obtain a solidified body, and burying after solidification.
The pretreatment process comprises the following steps: the leachate is firstly added with the pretreatment salt and stirred for 10-60 min, and then added with the composite material and stirred for 5-60 min.
The pretreatment salt is one or more of sodium phosphate, potassium phosphate, sodium iron oxalate, sodium diacetate, aluminum sulfate, polymeric ferric sulfate and polymeric aluminum chloride;
preferably, the pretreatment salt is sodium iron oxalate and polyaluminium chloride, the addition amount of the pretreatment salt is 0.1-0.5% of the mass of the concentrated solution, and the mass ratio of the sodium iron oxalate to the polyaluminium chloride is 1: 1-10: 1, preferably the mass ratio is 3: 1.
the composite material is one or more of light calcined powder, sodium lignosulphonate, red mud, gypsum, fly ash, slag, steel slag, water-quenched slag, furnace slag, hydroxyethyl cellulose and tailings.
The addition amount of the composite material is 15-18% of the mass of the concentrated solution.
The added pretreatment salt can remove hardness and part of COD in the leachate, the added composite material adsorbs and removes the COD and ammonia nitrogen in the leachate, and the added composite material is not modified at all, so that the added dosage is large in order to ensure a good adsorption effect, and meanwhile, a filter cake layer can be effectively formed by sufficient composite material during filtering, so that the filtering speed and the filtering effect are improved.
In the filter pressing process, the mass fraction of filter residues after filter pressing is 70-90%.
In the evaporation process, the concentration multiple of the filtrate is 8-16 times.
For the membrane concentrated solution, sulfuric acid is added in the membrane treatment process and the evaporation process and is finally uniformly distributed in the mother solution in the form of sulfate, the sulfate belongs to a known cementing material excitant, and composite materials (such as light calcined powder, fly ash, slag and the like) added in the pretreatment have potential cementing property, so that the two are mixed in the solidification process and the cementing property of the composite materials is just stimulated. In order to make up for the defects caused by a single excitation material and further obtain a good gelling effect, a strengthening activator is added in the curing process to ensure that the curing requirement is met.
In the curing process, the added activating agent is one or more of isopropanolamine, diglycolamine, sodium lactate, sodium polycarboxylate and starch, the addition amount is 0.1-2% of the composite material, the water content of a cured body obtained by mixing the filter residue and the evaporation mother liquor is 20-50%, and the curing mode is natural condition curing for 7 days.
Preferably, the water content of the cured product is 20% to 30%.
The beneficial effects of the invention include:
1. according to the invention, pretreatment salt is adopted for pretreatment, so that partial removal of hardness and COD can be simultaneously carried out, after the composite material is added, COD and ammonia nitrogen can be further removed, and the treatment can obviously relieve scaling of the evaporator and reduce energy consumption; meanwhile, after the composite material is added into the concentrated solution, certain mass concentration is ensured, and a filter cake layer can be effectively formed during filtering, so that a good filtering effect is obtained.
2. In the selection of the composite material, the adsorption performance and the potential gelation performance of the composite material are utilized, and sulfate contained in the membrane concentrated solution is utilized for primary excitation, so that the method is different from the prior art that the prepared gelation material is added at the tail end. The composite material is mainly industrial solid waste, has wide source and low cost, and skillfully achieves the effect of treating waste by waste; in addition, the composite material does not need any modification, and the deficiency of the adsorption performance is compensated by the using amount of the composite material, and the 'excess' is exactly needed by the subsequent process.
3. The sulfate inherent in the evaporation mother liquor and the added composite material mainly comprising industrial solid waste react with each other to achieve a good curing effect, and the operation cost is obviously reduced.
The invention relates to a high-concentration landfill leachate membrane concentrated solution treatment process, which comprises the following steps of: (1) pretreatment: sequentially adding pretreatment salt and a composite material into the landfill leachate membrane concentrated solution, and stirring to primarily remove hardness, COD (chemical oxygen demand) and ammonia nitrogen; (2) and (3) filter pressing: feeding the stirred concentrated solution into a filter pressing system to obtain filtrate and filter residues, feeding the filtrate into a collecting tank, and piling the filter residues for later use; (3) and (3) evaporation: and (3) the filtrate enters an evaporation system from the collection tank for evaporation concentration, the evaporation mother liquor enters a solidification system, the condensate returns to the membrane treatment system, and the condensate is discharged after reaching the standard. (4) And (3) curing: and evaporating the mother liquor, adding an activating agent into the filter residue, uniformly stirring to obtain a solidified body, and burying after solidification. The process of the invention carries out high-efficiency pretreatment before evaporation treatment, greatly relieves the scaling of the evaporator and reduces the energy consumption of the evaporator; in the curing process, active ingredients (such as sodium sulfate, potassium sulfate and the like) in the filter residue and the evaporation mother liquor are utilized, and a cured body meeting the landfill requirement is formed through activation, so that the cost is reduced.
Drawings
Fig. 1 is a flow chart of a process for treating a high-concentration landfill leachate membrane concentrate according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further clearly and completely described below with reference to the specific embodiments and the accompanying drawings, but the protection scope of the present invention is not limited thereby.
It should be noted that the terms "pressure filtration", "evaporation" and "solidification" in the present invention do not limit any equipment type and process parameters, and those skilled in the art can clearly understand the exact meaning, structural configuration and operation principle of these terms, so that they do not need to be described in detail in the present invention.
Reagent and consumable
The composite material adopted by the invention comprises the following components: fly ash, slag, red mud and the like are solid waste raw materials which can be obtained by a person skilled in the art through conventional channels, further modification is not needed, and the change of the chemical composition content does not influence the final treatment effect of the invention.
Group 1 example, the process for membrane treatment of concentrated landfill leachate according to the invention
The embodiment of the group provides a treatment process of a high-concentration landfill leachate membrane concentrated solution. All embodiments of this group share the following common features: the treatment process of the high-concentration landfill leachate membrane concentrated solution comprises the following steps: pretreating the high-concentration landfill leachate membrane concentrated solution by using pretreatment salt and a composite material so as to reduce the concentration of COD (chemical oxygen demand) and ammonia nitrogen in the high-concentration landfill leachate membrane concentrated solution;
the pretreatment salt is selected from the group consisting of sodium iron oxalate, sodium diacetate, polyaluminium chloride;
the composite material is selected from the group consisting of light burned powder, sodium lignosulfonate, fly ash and slag.
In some specific embodiments, the pretreatment refers to the sequential mixing of the high concentration landfill leachate membrane concentrate with pretreatment salt and composite material;
preferably, the mixing time with the pretreatment salt is 10-60 min, preferably 50 min; the time for mixing the composite material is 5-60 min, preferably 30 min; the mixing time can ensure that the pretreatment reaction is complete and thorough, and can reduce COD or ammonia nitrogen in the high-concentration landfill leachate membrane concentrated solution to the maximum extent;
preferably, the mixing is by stirring.
In other embodiments, the amount of the pretreatment salt added is 0.1 to 1%, preferably 0.1 to 0.5%,
preferably, the mass ratio of the sodium iron oxalate to the polyaluminium chloride is 1-10: 1, preferably 3: 1, and the positive effect of the mass ratio on the final treatment effect is taken as follows: after the substances are added, calcium oxalate precipitation is firstly generated, the hardness of the precipitate is removed, the precipitate is superior to that of the precipitate removed by a conventional double-alkali method, and the polyaluminium chloride is added, so that the precipitate precipitation is accelerated, part of COD can be removed, the effects of removing hardness and COD and the medicament cost are integrated, and the proportion is most reasonable.
In a further embodiment, the composite material is selected from one of the following formulations:
the mass ratio is 0.5-3: 1, preferably 1: 1, light calcined powder and fly ash;
the mass ratio is 0.5-5: 1: 0.1 to 0.5, preferably 1: 1: 0.2 of light burning powder, fly ash and sodium lignosulfonate;
the mass ratio is 1-5: 1, preferably 3: fly ash and slag of 1.
In some embodiments, the composite material is added in an amount of 5% to 30%, preferably 15% to 18% by mass of the high concentration landfill leachate membrane concentrate.
In a further embodiment, the high concentration landfill leachate membrane concentrate is pretreated and then subjected to pressure filtration to obtain a filtrate and filter residue;
preferably, the mass fraction of the filter residue is 70-90%, preferably 80-85%, and the mass fraction of the filter residue refers to the mass percentage of dry solids in the filter residue in the whole filter residue; the filter residue in this context refers to a filter cake obtained after pressure filtration; although the solid form is apparent, the solid form is not absolutely 100% solid matter, and the inside contains a part of water. The advantage of controlling the mass fraction of the filter residue in the above range is: the filter residues with the mass fraction can be directly mixed with evaporation mother liquor obtained in the subsequent evaporation link in the solidification process without adding extra water; if the mass fraction is too high, additional water needs to be added in the solidification link, and if the mass fraction is too low, the water content is too much, so that the solidification effect is influenced, and the water yield of the concentrated solution is reduced.
In a further embodiment, the filtrate is concentrated;
the concentration is preferably carried out by heating and evaporating;
preferably, evaporating and concentrating the filtrate to obtain evaporation mother liquor and condensate;
the evaporation mother liquor refers to the liquid left after evaporation, the condensate refers to the liquid obtained after condensation of gas obtained by evaporation and gasification, main pollutants are concentrated in the evaporation mother liquor, and the condensate contains a small part, so that the condensate is required to enter a previous membrane system to ensure that the condensate reaches the standard and is discharged; the membrane system refers to the place where the "high concentration landfill leachate membrane concentrate" of the present invention is initially produced, i.e., the "high concentration landfill leachate membrane concentrate" is the membrane concentrate discharged from the membrane system.
Preferably, the concentration multiple of the filtrate is 8-16 times, preferably 9-11 times; the benefits of using this concentration factor include: (1) taking energy consumption and the water yield of the concentrated solution into consideration, and (2) directly mixing the mother solution at the concentration multiple with the preferable 80-85% of filter residues, so that better mixing property can be ensured, no additional water is required, and the best curing effect can be achieved.
Preferably, the evaporation mother liquor and the filter residue are mixed with an activating agent for solidification to obtain a solidified body;
the activator is selected from the group consisting of diglycolamine, sodium lactate, sodium polycarboxylate, starch; the activator has the functions of: because the composite material used in the pretreatment link has potential gelation performance, an obvious gelation effect can be generated after excitation, evaporation mother liquor contains a large amount of sulfate which is also an activator of the gelation material, and the addition of the activator mainly strengthens the gelation effect to ensure the gelation performance of a solidified body in consideration of the water quality fluctuation of a membrane concentrated solution, so that the strength of the generated solidified body is high enough to further stabilize the integral property of the solidified body, and the high stability is brought by the high strength of the solidified body during landfill, and the situations of disintegration, leakage or seepage and the like can not occur even if the solidified body is buried underground for a long time.
Preferably, the curing refers to natural condition curing for 7 days;
preferably, the water content of the solidified body is 20-50%, preferably 20-30%; the benefits of using this moisture content are: on the premise of considering the curing strength, the preparation process of the cured body has better mixing property;
preferably, the addition amount of the activating agent is 0.1-2%, preferably 0.1-0.18% of the high-concentration landfill leachate membrane concentrate.
In a specific embodiment, the activator is selected from one of the following formulations:
1-8% of sodium polycarboxylate and starch: 1, or diglycolamine and sodium lactate in a ratio of 0.1-1: 1.
the embodiment of the group also provides application of the high-concentration landfill leachate membrane concentrated solution treatment process in the aspects of treating wastewater, sewage and landfill leachate.
Group 2 example, pretreatment compositions of the invention
The present group of embodiments provides a pretreatment composition for high concentration landfill leachate membrane concentrates. All embodiments of this group share the following common features: the pretreatment composition for the high-concentration landfill leachate membrane concentrate comprises the following components in percentage by weight: pretreating salt and composite materials;
the pretreatment salt is selected from the group consisting of sodium iron oxalate, sodium diacetate, polyaluminium chloride;
the composite material is selected from the group consisting of light burned powder, sodium lignosulfonate, fly ash and slag.
In some embodiments, the composite material is selected from one of the following formulations:
the mass ratio is 0.5-3: 1, light calcined powder and fly ash;
the mass ratio is 0.5-5: 1: 0.1-0.5 parts of light burning powder, fly ash and sodium lignosulfonate; or the like, or, alternatively,
the mass ratio is 1-5: fly ash and slag of 1.
In some embodiments, the composite material is selected from one of the following formulations:
the mass ratio is 1: 1, light calcined powder and fly ash;
the mass ratio is 1: 1: 0.2 of light burning powder, fly ash and sodium lignosulfonate; or the like, or, alternatively,
the mass ratio is 3: fly ash and slag of 1.
The light calcined powder has the following functions in the composite material: (1) the light burning powder can adsorb COD in the percolate; (2) the light calcined powder has potential gelling property and can be used as a main material of a gelling material;
the fly ash has the following functions in the composite material: the material mainly has adsorption performance and partial potential gelation performance;
the sodium lignin sulfonate has the following functions in the composite material: after the composite material and the concentrated solution are stirred, a filtering step is carried out, and the filtering speed can be obviously increased by adding the sodium lignosulfonate;
the function of the slag in the composite material is as follows: (1) the slag has potential gelling property, and (2) the slag has coarser granularity compared with light calcined powder and fly ash, and can effectively prevent hardening and improve the filtering speed when a filter cake layer is formed.
In a preferred embodiment, the addition amount of the composite material is 5-30% of the mass of the high-concentration landfill leachate membrane concentrated solution.
In a more preferable embodiment, the addition amount of the composite material is 15-18% of the mass of the high-concentration landfill leachate membrane concentrated solution.
In specific embodiments, the pretreatment salt is selected from: sodium iron oxalate, or sodium diacetate, or a mixture of sodium iron oxalate and polyaluminium oxide.
Wherein the sodium diacetate has the following functions: sodium diacetate has the effects of mildew prevention, disinfection and sterilization, the concentrated solution after pretreatment can enter a collecting tank firstly, and then enters a subsequent evaporation process from the collecting tank, and even during the equipment maintenance or parking period, the concentrated solution in the collecting tank can not mildew or breed bacteria or algae, so the working environment is improved.
In some embodiments, the mass ratio of the sodium iron oxalate to the polymeric alumina in the mixture of the sodium iron oxalate and the polymeric alumina is 1-10: 1.
in other embodiments, the mass ratio of sodium iron oxalate to polyaluminum oxide in the mixture of sodium iron oxalate and polyaluminum oxide is 3: 1.
In a further embodiment, the amount of the pretreatment salt added is 0.1 to 1%, preferably 0.1 to 0.5% by mass of the high concentration landfill leachate membrane concentrate.
The group of embodiments also provides application of the pretreatment composition for the high-concentration landfill leachate membrane concentrated solution in treating landfill leachate, landfill leachate membrane concentrated solution, sewage and wastewater.
Group 3 examples, activators of the invention
The group of embodiments provides an activator for strengthening a high-concentration landfill leachate membrane concentrated solution solidified body. All embodiments of this group share the following common features: the activator is selected from the group consisting of sodium polycarboxylate, diglycolamine, starch, sodium lactate.
In some specific embodiments, the activator is selected from one of the following formulations: 1-8% of sodium polycarboxylate and starch: 1, or diglycolamine and sodium lactate in a ratio of 0.1-1: 1.
wherein the sodium polycarboxylate acts as: adjusting the workability of the filter residue and the mother liquor in the stirring process under high mass concentration, and enhancing the strength of a solidified body;
the role starch plays in activators is: mainly plays a role of a dispersant and also has the functions of thickening and moisturizing. In the operation process, even if the curing system is in a low mass concentration condition, the curing material and the mother liquor are uniformly distributed without sedimentation, and fine particulate matters are prevented from suspending on the upper layer of the curing body to influence the curing effect; the thickening property of the starch means that the viscosity of the curing system can be improved, and the release of gas generated in the curing process can be delayed or prevented.
The function of diglycolamine in activators is: the release of ammonia is delayed, the mother liquor contains a large amount of ammonium salt, the filter residue contains partial alkaline substances, ammonia can be released in the reaction process, the release degree is related to water quality, diglycolamine can be adsorbed on the surface of the filter residue particles to delay the release of ammonia, and air holes cannot be left on the surface of the solidified body in the later period, so that the strength of the solidified body is indirectly improved, and in addition, the solidified body has the function of moisture preservation;
sodium lactate in the activator functions as: as the humectant, the solidified body is generally stockpiled under natural conditions after being prepared, when the outdoor temperature is overhigh, the solidified body loses water too fast and is easy to crack, so that the solidification quality is poor, and the addition of sodium lactate plays a role similar to the conventional concrete watering maintenance.
In a specific embodiment, the activator is selected from one of the following formulations: the mass ratio of the sodium polycarboxylate to the starch is 8: 1, or the mass ratio is 0.2-0.5: 1 diglycolamine: sodium lactate.
In other embodiments, the activator is used in an amount of 0.1% to 2% by mass of the high concentration landfill leachate membrane concentrate.
In some embodiments, the activator is present in an amount of 0.1 to 0.18% by weight of the high concentration landfill leachate membrane concentrate.
The group of embodiments also provides application of the activating agent for strengthening the high-concentration landfill leachate membrane concentrated solution solidified body in treating landfill leachate, high-concentration landfill leachate membrane concentrated solution, sewage and wastewater.
Experimental example 1
A process for treating the concentrated liquid film of high-concentration garbage percolate includes such steps as:
(1) pretreatment: 1000kg of membrane concentrated solution generated by the leachate through a reverse osmosis membrane system is added with 2kg of sodium ferric oxalate and stirred for 30min, then 150kg of light burning powder and fly ash (the mass ratio of the light burning powder to the fly ash is 1: 1) are added, and the stirring is continued for 30 min;
(2) and (3) filter pressing: feeding the stirred concentrated solution into a filter pressing system to obtain filtrate and filter residues with the mass fraction of 80%, feeding the filtrate into a collecting tank, and piling the filter residues for later use;
(3) and (3) evaporation: and (3) the filtrate enters an evaporation system from the collection tank for evaporation concentration, after 9 times of concentration, evaporation mother liquor enters a solidification system, condensate returns to a membrane treatment system, and the condensate is discharged after reaching the standard.
(4) And (3) curing: 1kg of sodium polycarboxylate and starch serving as activators (the mass ratio of the sodium polycarboxylate to the starch is 8: 1) are added into the evaporation mother liquor and are uniformly stirred in a stirrer to obtain a solidified body with the mass concentration of 70%, and the solidified body is buried after natural curing for 7 days.
Comparative example 1
A process for treating the concentrated liquid film of high-concentration garbage percolate includes such steps as:
(1) and (3) evaporation: 1000kg of membrane concentrated solution enters an evaporation system from a collection tank for evaporation concentration, after 9 times of concentration, evaporation mother liquor enters a solidification system, condensate returns to a membrane treatment system, and the condensate is discharged after reaching the standard.
(2) And (3) curing: and (4) adding cement into the evaporation mother liquor to adjust the mass concentration of the solidification body to be 70%, and burying after natural curing for 7 days.
Experimental example 2
A process for treating the concentrated liquid film of high-concentration garbage percolate includes such steps as:
(1) pretreatment: 1000kg of membrane concentrated solution generated by the leachate through a reverse osmosis membrane system is added with 3kg of sodium ferric oxalate and polyaluminium chloride (the mass ratio of the sodium ferric oxalate to the polyaluminium chloride is 3: 1) and stirred for 30min, then 150kg of light burning powder, fly ash and lignosulfonic acid (the mass ratio of the light burning powder to the fly ash to the lignosulfonic acid is 1: 1: 0.2) are added, and stirring is continued for 50 min;
(2) and (3) filter pressing: feeding the stirred concentrated solution into a filter pressing system to obtain filtrate and filter residues with the mass fraction of 82%, feeding the filtrate into a collecting tank, and piling the filter residues for later use;
(3) and (3) evaporation: and (3) the filtrate enters an evaporation system from the collection tank for evaporation concentration, after 10 times of concentration, evaporation mother liquor enters a solidification system, condensate returns to a membrane treatment system, and the condensate is discharged after reaching the standard.
(4) And (3) curing: evaporating the mother liquor, adding 1.2kg of diglycolamine into filter residues: sodium lactate (mass ratio of 0.2: 1) is stirred uniformly in a stirrer to obtain a solidified body with the mass concentration of 72%, and the solidified body is cured for 7 days under natural conditions and then buried.
Comparative example 2
A process for treating the concentrated liquid film of high-concentration garbage percolate includes such steps as:
(1) pretreatment: adding 3kg of sodium phosphate into 1000kg of membrane concentrated solution generated by the leachate through a reverse osmosis membrane system, and stirring for 30 min;
(2) and (3) filter pressing: feeding the stirred concentrated solution into a filter pressing system to obtain filtrate and filter residues with the mass fraction of 82%, feeding the filtrate into a collecting tank, and piling the filter residues for later use;
(3) and (3) evaporation: and (3) the filtrate enters an evaporation system from the collection tank for evaporation concentration, after 10 times of concentration, evaporation mother liquor enters a solidification system, condensate returns to a membrane treatment system, and the condensate is discharged after reaching the standard.
(4) And (3) curing: and (3) evaporating the mother liquor, adding cement into filter residues, uniformly stirring in a stirrer, adjusting to a solidified body with the mass concentration of 72%, and performing landfill after natural curing for 7 days.
Experimental example 3
A process for treating the concentrated liquid film of high-concentration garbage percolate includes such steps as:
(1) pretreatment: adding 1000kg of membrane concentrated solution generated by a reverse osmosis membrane system into the leachate, stirring for 40min, adding 180kg of fly ash and slag (the mass ratio of fly ash to slag is 3: 1), and continuously stirring for 60 min;
(2) and (3) filter pressing: feeding the stirred concentrated solution into a filter pressing system to obtain filtrate and filter residues with the mass fraction of 85%, feeding the filtrate into a collecting tank, and piling the filter residues for later use;
(3) and (3) evaporation: and (3) the filtrate enters an evaporation system from the collection tank for evaporation concentration, after 11 times of concentration, evaporation mother liquor enters a solidification system, condensate returns to a membrane treatment system, and the condensate is discharged after reaching the standard.
(4) And (3) curing: evaporating the mother liquor, adding 1.8kg of diglycolamine into filter residues: sodium lactate (mass ratio of 0.5: 1) is stirred uniformly in a stirrer to obtain a solidified body with the mass concentration of 73%, and the solidified body is cured for 7 days under natural conditions and then buried.
Comparative example 3
A process for treating the concentrated liquid film of high-concentration garbage percolate includes such steps as:
(1) pretreatment: adding 180kg of fly ash and slag (the mass ratio of fly ash to slag is 3: 1) into 1000kg of membrane concentrated solution generated by a reverse osmosis membrane system of the leachate, and continuously stirring for 60 min;
(2) and (3) filter pressing: feeding the stirred concentrated solution into a filter pressing system to obtain filtrate and filter residues with the mass fraction of 85%, feeding the filtrate into a collecting tank, and piling the filter residues for later use;
(3) and (3) evaporation: and (3) the filtrate enters an evaporation system from the collection tank for evaporation concentration, after 11 times of concentration, evaporation mother liquor enters a solidification system, condensate returns to a membrane treatment system, and the condensate is discharged after reaching the standard.
(4) And (3) curing: evaporating the mother liquor and uniformly stirring the filter residue in a stirrer to obtain a solidified body with the mass concentration of 73%, and burying after natural curing for 7 days.
In the above experimental examples, the components of the membrane concentrate are shown in table 1; the energy consumption of each ton of the concentrated solution evaporator is shown in table 2; after the curing time of the cured body is finished, the toxicity leaching test of the cured body is detected by referring to the leaching method of HJ/T300, and the leaching liquid result is shown in Table 3.
TABLE 1 comparison of data before and after pretreatment of the components of the membrane concentrate according to the invention
In table 1 above, "front" refers to various index data of the membrane concentrate obtained by "membrane treatment" of the landfill leachate, and "rear" refers to various index data of the membrane concentrate pretreated by the pretreatment composition of the present invention. The numerical values of the columns under the 'mass ratio of each component of the pretreatment salt' are dimensionless numerical values of the mass ratio of the components of the pretreatment salt, and the numerical values of the columns under the 'mass ratio of each component of the composite material' are dimensionless numerical values of the mass ratio of the components of the composite material. "-" indicates that the material is absent.
TABLE 2 energy consumption and solidification Effect of evaporator for concentrated solution per ton
Table 3 experimental examples leaching experimental results
Description of the drawings: "ND" means not detected; "before treatment" means the content of the contaminant in the concentrated solution of the experimental example, and "after treatment" means the inspection result of the treated leachate of the experimental example.
Claims (6)
1. An activator for strengthening a solidified body of a high-concentration landfill leachate membrane concentrated solution is characterized in that the activator is selected from the group consisting of sodium polycarboxylate, diglycolamine, starch and sodium lactate.
2. An activator for strengthening a solidified body of a high concentration landfill leachate membrane concentrate of claim 1, wherein the activator is selected from one of the following formulations: 1-8% of sodium polycarboxylate and starch: 1, or diglycolamine and sodium lactate in a ratio of 0.1-1: 1.
3. an activator for strengthening a solidified body of a high concentration landfill leachate membrane concentrate of claim 1 or 2, wherein the activator is selected from one of the following formulations: the mass ratio is 8: 1, sodium polycarboxylate and starch or the mass ratio of 0.2-0.5: 1 diglycolamine: sodium lactate.
4. The activator for strengthening the solidified body of the high-concentration landfill leachate membrane concentrated solution according to any one of claims 1 to 3, wherein the amount of the activator is 0.1 to 2% by mass based on the mass of the high-concentration landfill leachate membrane concentrated solution.
5. The activator for strengthening the solidified body of the high-concentration landfill leachate membrane concentrated solution according to claim 4, wherein the amount of the activator is 0.1 to 0.18% by mass based on the high-concentration landfill leachate membrane concentrated solution.
6. Use of an activator according to any one of claims 1 to 5 for strengthening a solidified body of a high strength landfill leachate membrane concentrate for the treatment of landfill leachate, high strength landfill leachate membrane concentrates, sewage, and wastewater.
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