CN113754151A - Method and system for pretreating landfill leachate - Google Patents
Method and system for pretreating landfill leachate Download PDFInfo
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- CN113754151A CN113754151A CN202111260253.9A CN202111260253A CN113754151A CN 113754151 A CN113754151 A CN 113754151A CN 202111260253 A CN202111260253 A CN 202111260253A CN 113754151 A CN113754151 A CN 113754151A
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- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 239000006228 supernatant Substances 0.000 claims abstract description 34
- 238000006481 deamination reaction Methods 0.000 claims abstract description 29
- 230000009615 deamination Effects 0.000 claims abstract description 24
- 238000005345 coagulation Methods 0.000 claims abstract description 21
- 230000015271 coagulation Effects 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000701 coagulant Substances 0.000 claims abstract description 11
- 239000008394 flocculating agent Substances 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 230000001376 precipitating effect Effects 0.000 claims abstract description 5
- 238000004062 sedimentation Methods 0.000 claims description 26
- 238000005189 flocculation Methods 0.000 claims description 20
- 230000016615 flocculation Effects 0.000 claims description 20
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims description 20
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 15
- 229920002401 polyacrylamide Polymers 0.000 claims description 13
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 239000011790 ferrous sulphate Substances 0.000 claims description 9
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 9
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 3
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 3
- 235000019800 disodium phosphate Nutrition 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- 235000012245 magnesium oxide Nutrition 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 10
- 239000000047 product Substances 0.000 abstract description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 6
- 244000005700 microbiome Species 0.000 abstract description 4
- 229910017958 MgNH Inorganic materials 0.000 abstract description 2
- 229910021529 ammonia Inorganic materials 0.000 abstract description 2
- 239000000084 colloidal system Substances 0.000 abstract description 2
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 13
- 230000002829 reductive effect Effects 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000012028 Fenton's reagent Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 150000003017 phosphorus Chemical class 0.000 description 2
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- -1 phosphate radical ions Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 235000018648 unbalanced nutrition Nutrition 0.000 description 1
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F1/46114—Electrodes in particulate form or with conductive and/or non conductive particles between them
-
- 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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Environmental & Geological Engineering (AREA)
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a method and a system for pretreating landfill leachate, and relates to the technical field of wastewater treatment. The method for pretreating the landfill leachate provided by the invention comprises the following steps: (1) pretreating raw garbage leachate by using a coagulant, adding a flocculating agent, and performing precipitation separation to obtain primary supernatant; (2) and (2) adjusting the pH value of the first-stage supernatant obtained in the step (1) to 10-11, adding a deamination agent, and reacting and precipitating to obtain a second-stage supernatant. The invention can effectively remove most suspended matters and colloids in the raw water of the landfill leachate by adopting coagulation pretreatment to the raw water of the landfill leachate so as to reduce the treatment load and the treatment cost of the subsequent process, and utilizes the deamination agent and NH in the wastewater4+The reaction produces MgNH with small solubility product4PO4·6H2O product, thereby reducing ammonia in the leachateNitrogen inhibition of microorganisms in subsequent treatment processes.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a pretreatment method and a pretreatment system for landfill leachate.
Background
The landfill leachate has the characteristics of high ammonia nitrogen content, high organic matter concentration, poor biodegradability and complex components. The ammonia nitrogen concentration of the leachate in the early landfill is generally 3000-4000mg/L, and the leachate mainly comes from the deamination reaction of amino acid generated by the degradation of amino-containing organic matters such as protein and the like and the hydrolysis fermentation reaction of the organic matters. The organic concentration of the early landfill leachate is generally 4000-8000mg/L, and the ratio of biochemical oxygen demand (BOD5) to Chemical Oxygen Demand (COD) (namely B/C value) is low. Aerobic biochemical treatment generally requires that the nutrient proportion of wastewater is C: N: P is 100:5:1, and landfill leachate has high ammonia nitrogen concentration and unbalanced nutrient proportion, which is greatly different from the nutrient proportion required by microorganism growth and reproduction, has high ammonia nitrogen content and plays a role in inhibiting the biochemistry, so that pretreatment of the landfill leachate is required to remove a part of ammonia nitrogen, macromolecular organic matters are degraded into micromolecular organic matters capable of being utilized by the microorganisms, and the load is reduced for subsequent biochemical treatment.
At present, a pretreatment method for high ammonia nitrogen wastewater is generally an ammonium magnesium phosphate chemical precipitation Method (MAP), the chemical raw materials adopted by the method, namely magnesium salt and phosphorus salt, have higher cost, and the addition of phosphorus salt can cause secondary pollution, so that the total phosphorus content of effluent is increased; secondly, an ammonia stripping method, which needs to heat the wastewater, needs energy consumption when generating steam, and collects and processes stripped ammonia gas, is easy to cause secondary pollution and has higher cost; and thirdly, secondary pollution is caused by byproducts of chloramine and chlorinated organic matters in the breakpoint chlorination method.
Disclosure of Invention
The invention mainly aims to provide a method and a system for pretreating landfill leachate, and aims to solve the problems of high liquid ammonia nitrogen concentration and unbalanced nutrition proportion of the existing landfill leachate.
In order to achieve the above object, in a first aspect, the present invention provides a method for pretreating landfill leachate, comprising the following steps:
(1) pretreating raw garbage leachate by using a coagulant, adding a flocculating agent, and performing precipitation separation to obtain primary supernatant;
(2) and (2) adjusting the pH value of the first-stage supernatant obtained in the step (1) to 10-11, adding a deamination agent, and reacting and precipitating to obtain a second-stage supernatant.
According to the technical scheme, raw garbage leachate is subjected to coagulation pretreatment, and combined with the functions of netting, bridging and the like of a flocculating agent, so that the raw garbage leachate forms inorganic precipitation flocs, and then passes through a sedimentation tank, pollutants such as part of insoluble organic pollutants, suspended matters and the like in the wastewater are separated out in the sedimentation tank under the action of gravity, so that first-stage supernatant is obtained, and the load is reduced for subsequent treatment; the first-stage supernatant enters a pH adjusting tank to adjust the pH to 10-11, and then enters a deamination tank, a deamination agent is added, and the deamination agent can be mixed with NH in the first-stage supernatant4 +React to generate a large amount of MgNH4PO4·6H2O product due to MgNH4PO4·6H2The O solubility product is very small, the O solubility product mainly exists in water in a precipitation form, and a second-stage supernatant is obtained after precipitation and separation in an inclined tube precipitation tank, wherein the ammonia nitrogen content of the second-stage supernatant is greatly reduced compared with that of raw water of landfill leachate.
As a preferred embodiment of the method for pretreating landfill leachate, the deaminating agent in the step (2) mainly comprises the following components: aluminosilicate, silicon dioxide, magnesium oxide, sodium hydrogen phosphate and fly ash, wherein the addition amount of the deamination agent is 4-6 g/L.
In the technical scheme of the invention, after the deamination agent is dissolved in water, the released magnesium ions and phosphate radical ions can be mixed with NH in the first-stage supernatant4 +React to generate a large amount of MgNH4PO4·6H2And O, so that the ammonia nitrogen is removed.
As a preferred embodiment of the method for pretreating landfill leachate in the invention, the coagulant in step (1) is ferrous sulfate, and the addition amount of the ferrous sulfate is 500-600 mg/L; the flocculant is polyacrylamide, and the addition amount of the polyacrylamide is 3-5 mg/L.
As a preferred embodiment of the method for pretreating landfill leachate, the pH value of raw landfill leachate is adjusted to 7.5-8.5 before the coagulant pretreatment in step (1).
As a preferred embodiment of the method for pretreating landfill leachate according to the present invention, after the step (2), the method further comprises:
(3) and (3) adjusting the pH value of the second-stage supernatant obtained in the step (2) to 2.5-3.5, adding the second-stage supernatant into an iron-carbon fixed bed, adding hydrogen peroxide, reacting under the condition of aeration and stirring, and precipitating and separating to obtain a third-stage supernatant.
In the technical scheme of the invention, the pH value of the secondary supernatant is continuously adjusted to 2.5-3.5, and the secondary supernatant enters an iron-carbon fixed bed, is added with hydrogen peroxide and reacts under the condition of aeration and stirring. In the process, a reaction system consisting of iron and carbon particles in the wastewater is utilized to form countless micro batteries, and electric field force generated by the reaction of the micro batteries acts on colloidal particles so that the colloidal particles move directionally and are deposited on electrodes; the micro-electrolysis system can also generate a large amount of free radicals, ions and other substances to degrade pollutants; ferrous ions and a small amount of hydrogen peroxide continuously generated in the reaction system form a Fenton reagent, and can effectively oxidize refractory organic pollutants in the leachate and reduce the chromaticity.
The mechanism of the micro-electrolysis reaction of the second-stage supernatant in the iron-carbon fixed bed is as follows:
anode (iron): fe-2e-→Fe2+，E0(Fe2+/Fe)＝-0.44V，
Cathode (carbon):
a. when in an acidic solution: 2H++2e-→2[H]→H2↑，E0(2H+/H2) 0.0V (hydrogen evolution corrosion),
b. when in neutral oxygenated solution: o is2+2H2O+4e-→4OH-，E0(O2/OH-)＝0.401V，
c. When oxygenated in acidic condition and in the presence of SO4 2-In the environment: o is2+4H++4e-→2H2O，E0(O2/H2O) 1.23V (oxygen corrosion) or O2+2H++2e-→H2O2。
As a preferred embodiment of the method for pretreating landfill leachate in the invention, the addition amount of hydrogen peroxide in the step (3) is 200-300 mg/L; and (4) adding polyacrylamide for precipitation in the step (3), wherein the addition amount of the polyacrylamide is 3-5 mg/L.
In a second aspect, the invention further provides a pretreatment system for landfill leachate, which sequentially comprises a first coagulation reaction tank, a first flocculation reaction tank, a first inclined tube sedimentation tank, a second pH adjusting tank, a deamination tank and a second inclined tube sedimentation tank according to the running direction of water flow.
In the technical scheme of the invention, a coagulant ferrous sulfate is added into a first coagulation reaction tank, a flocculant polyacrylamide is added into the first flocculation reaction tank, raw garbage leachate sequentially passes through the first coagulation reaction tank and the first flocculation reaction tank, inorganic precipitation flocs are formed through the actions of the coagulant and the flocculant such as net catching and bridging and then enter a first inclined tube sedimentation tank, partial insoluble organic pollutants, suspended matters and other pollutants in the wastewater are separated out through the action of gravity, separated supernatant effluent enters a second pH adjusting tank, the pH value is adjusted to a specified range, the separated supernatant effluent enters a deamination tank for continuous reaction, and NH in the wastewater is continuously reacted4 +The reaction in the deamination tank generates a large amount of MgNH with small solubility product4PO4·6H2And the supernatant of the O product, which is separated after the O product is precipitated in the second inclined tube precipitation tank, is removed with most of ammonia nitrogen compared with the raw water of the landfill leachate.
As a preferred embodiment of the landfill leachate pretreatment system, a first pH adjusting tank and/or a first adjusting tank is/are further arranged before the first coagulation reaction tank; and a second coagulation reaction tank and/or a second flocculation reaction tank are/is arranged between the deamination tank and the second inclined tube sedimentation tank.
As a preferred embodiment of the landfill leachate pretreatment system of the present invention, a third pH adjusting tank, an iron-carbon fixed bed and a third inclined tube sedimentation tank are further disposed after the second inclined tube sedimentation tank.
According to the technical scheme, a third pH adjusting tank, an iron-carbon fixed bed and a third inclined tube sedimentation tank are further arranged behind the second inclined tube sedimentation tank, so that organic matters in the wastewater can be further degraded, and the chromaticity of the wastewater is reduced.
As a preferred embodiment of the landfill leachate pretreatment system, a third flocculation reaction tank is further arranged between the iron-carbon fixed bed and the third inclined tube sedimentation tank.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts FeSO4The raw water of the landfill leachate is subjected to coagulation pretreatment, so that most of suspended matters and colloids in the raw water of the landfill leachate can be effectively removed, and the treatment load and the treatment cost of a subsequent process are reduced;
(2) the invention utilizes the deamination agent and NH in the wastewater4 +React to generate MgNH4PO4·6H2The O product reduces the inhibition effect of ammonia nitrogen in the percolate on microorganisms in the subsequent treatment process, has better deamination effect and lower cost compared with the traditional deamination method (such as MAP chemical precipitation method and blow-off method), and can avoid the problems of secondary pollution and the like;
(3) aiming at the iron-carbon micro-electrolysis process, the air stirring and the addition of a hydrogen peroxide agent are added to form a Fenton reagent, so that macromolecular degradation-resistant organic pollutants in the leachate are effectively oxidized, the chromaticity is reduced, the defects of easy caking and short flow of the traditional iron-carbon micro-electrolysis fixed bed are overcome, and the biodegradability of the treated leachate is improved;
(4) the invention comprehensively adopts the combined process of ferrous sulfate coagulation pretreatment, deamination agent reaction and iron-carbon fixed bed, and has good treatment effect on landfill leachate raw water with high ammonia nitrogen content, high organic matter concentration and complex components under the synergistic effect of the ferrous sulfate coagulation pretreatment, the deamination agent reaction and the iron-carbon fixed bed.
Drawings
FIG. 1 is a schematic view of a landfill leachate pretreatment system according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of an iron-carbon fixed bed apparatus in a landfill leachate pretreatment system according to embodiment 1 of the present invention;
wherein the drawings are described as follows: 1-an adjusting tank, 2-a first pH adjusting tank, 3-a first coagulation reaction tank, 4-a first flocculation reaction tank, 5-a first inclined tube sedimentation tank, 6-a second pH adjusting tank, 7-a deamination reaction tank, 8-a second coagulation reaction tank, 9-a second flocculation reaction tank, 10-a second inclined tube sedimentation tank, 11-a third pH adjusting tank, 12, 13-an iron carbon fixed bed, 14-a third flocculation reaction tank and 15-a third inclined tube sedimentation tank; 12. 13-fixed bed of iron-carbon comprising: a-a packing layer and b-an aeration head.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
Example 1
The landfill leachate pretreatment system of this embodiment as shown in fig. 1 includes in order according to the water flow direction: the device comprises a regulating tank (1), a first pH regulating tank (2), a first coagulation reaction tank (3), a first flocculation reaction tank (4), a first inclined tube sedimentation tank (5), a second pH regulating tank (6), a deamination reaction tank (7), a second coagulation reaction tank (8), a second flocculation reaction tank (9), a second inclined tube sedimentation tank (10), a third pH regulating tank (11), iron carbon fixed beds (12, 13), a third flocculation reaction tank (14) and a third inclined tube sedimentation tank (15);
the adjusting tank (1) can be used for storing raw garbage percolate;
the iron-carbon fixed bed (12) and the iron-carbon fixed bed (13) have the same internal structure, the specific structure is shown in figure 2, the iron-carbon fixed beds (12 and 13) are internally provided with a packing layer (a) and an aeration head (b), and the packing layer (a) is activated carbon scrap iron.
Example 2
Based on the landfill leachate pretreatment system of embodiment 1, the raw landfill leachate with COD content of 6000-8000mg/L and ammonia nitrogen content of 2500-3000mg/L is treated.
The landfill leachate pretreatment method of the embodiment comprises the following steps:
firstly, according to the running direction of water flow, garbage leachate raw water sequentially passes through a regulating tank (1), a first pH regulating tank (2), a first coagulation reaction tank (3), a first flocculation reaction tank (4) and a first inclined tube sedimentation tank (5), in the process, the pH value of the first pH regulating tank (2) is regulated to 7.5-8.5, a coagulant ferrous sulfate is added into the first coagulation reaction tank (3), the addition amount of the ferrous sulfate is 500mg/L, a flocculating agent polyacrylamide is added into the first flocculation reaction tank (4), the addition amount of the polyacrylamide is 5g/L, and a first-stage supernatant is obtained after precipitation separation in the first inclined tube sedimentation tank (5);
the second step, loop through second pH equalizing basin (6), deamination reaction tank (7), second coagulation reaction tank (8), second flocculation reaction tank (9), second pipe chute sedimentation tank (10) with first order supernatant fluid, this in-process, adjust the pH value of second pH equalizing basin (6) to 10-11, throw with the deamination agent in deamination reaction tank (7), the essential element of deamination agent includes: aluminosilicate, silicon dioxide, magnesium oxide, sodium hydrogen phosphate and fly ash, wherein the addition amount of a deamination agent is 4-6g/L, polyaluminium chloride is added into a second coagulation reaction tank (8) as a coagulant, the addition amount of the polyaluminium chloride is 200-300mg/L, a flocculating agent polyacrylamide is added into a second flocculation reaction tank (9), the addition amount of the polyacrylamide is 3-5mg/L, and a second-level supernatant is obtained after precipitation separation in a second inclined tube precipitation tank (10).
Through detection, the ammonia nitrogen content in the second-level supernatant is 300-400mg/L, and the removal rate is about 85%.
Example 3
On the basis of example 2, the following operations were further carried out:
and thirdly, the second-level supernatant sequentially passes through a third pH adjusting tank (11), iron-carbon fixed beds (12 and 13), a third flocculation reaction tank (14) and a third inclined tube sedimentation tank (15), in the process, the pH value of the third pH adjusting tank (11) is adjusted to 2.5-3.5, a flocculating agent polyacrylamide is added into the third flocculation reaction tank (14), the addition amount of the polyacrylamide is 3-5mg/L, and the third-level supernatant is obtained after precipitation separation in the third inclined tube sedimentation tank (15).
Through detection, the COD content in the third-stage supernatant is 3000-4000mg/L, and the removal rate is about 50%.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The method for pretreating the landfill leachate is characterized by comprising the following steps of:
(1) pretreating raw garbage leachate by using a coagulant, adding a flocculating agent, and performing precipitation separation to obtain primary supernatant;
(2) and (2) adjusting the pH value of the first-stage supernatant obtained in the step (1) to 10-11, adding a deamination agent, and reacting and precipitating to obtain a second-stage supernatant.
2. The method for pretreating landfill leachate of claim 1, wherein the deaminating agent in step (2) comprises the following main components: aluminosilicate, silicon dioxide, magnesium oxide, sodium hydrogen phosphate and fly ash, wherein the addition amount of the deamination agent is 4-6 g/L.
3. The method for pretreating landfill leachate of claim 1, wherein the coagulant used in step (1) is ferrous sulfate, and the addition amount of the ferrous sulfate is 500-600 mg/L; the flocculant is polyacrylamide, and the addition amount of the polyacrylamide is 3-5 mg/L.
4. The method for pretreating landfill leachate according to claim 1, wherein the pH of raw landfill leachate is adjusted to 7.5-8.5 before the coagulant pretreatment in step (1).
5. The method for pretreating landfill leachate according to claim 1, further comprising, after the step (2):
(3) and (3) adjusting the pH value of the second-stage supernatant obtained in the step (2) to 2.5-3.5, adding the second-stage supernatant into an iron-carbon fixed bed, adding hydrogen peroxide, reacting under the condition of aeration and stirring, and precipitating and separating to obtain a third-stage supernatant.
6. The method for pretreating landfill leachate of claim 5, wherein the amount of hydrogen peroxide added in the step (3) is 200-300 mg/L; adding polyaluminium chloride for precipitation in the step (3), wherein the adding amount of the polyaluminium chloride is 200-300 mg/L.
7. The pretreatment system for the landfill leachate is characterized by comprising a first coagulation reaction tank, a first flocculation reaction tank, a first inclined tube sedimentation tank, a second pH adjusting tank, a deamination tank and a second inclined tube sedimentation tank in sequence according to the running direction of water flow.
8. The pretreatment system for landfill leachate according to claim 7, wherein a first pH adjusting tank and/or a regulating tank is further provided before the first coagulation reaction tank; and a second coagulation reaction tank and/or a second flocculation reaction tank are/is arranged between the deamination tank and the second inclined tube sedimentation tank.
9. The system for pretreating landfill leachate of claim 1, wherein a third pH adjusting tank, a fixed bed of iron and carbon, and a third inclined tube settling tank are further disposed after the second inclined tube settling tank.
10. The pretreatment system for landfill leachate according to claim 9, wherein a third flocculation reaction tank is further disposed between the fixed iron-carbon bed and the third inclined tube sedimentation tank.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113057A (en) * | 2006-07-27 | 2008-01-30 | 深圳市金达莱环保股份有限公司 | Combined technique for garbage filter liquor treatment |
| CN105461151A (en) * | 2014-08-19 | 2016-04-06 | 青岛炜烨锻压机械有限公司 | Landfill leachate treatment technology |
| CN106430863A (en) * | 2016-12-19 | 2017-02-22 | 宜兴市宜刚环保工程材料有限公司 | Landfill leachate treatment method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113057A (en) * | 2006-07-27 | 2008-01-30 | 深圳市金达莱环保股份有限公司 | Combined technique for garbage filter liquor treatment |
| CN105461151A (en) * | 2014-08-19 | 2016-04-06 | 青岛炜烨锻压机械有限公司 | Landfill leachate treatment technology |
| CN106430863A (en) * | 2016-12-19 | 2017-02-22 | 宜兴市宜刚环保工程材料有限公司 | Landfill leachate treatment method |
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Application publication date: 20211207 |