CN116282661A - Treatment method of landfill leachate concentrated solution - Google Patents
Treatment method of landfill leachate concentrated solution Download PDFInfo
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- CN116282661A CN116282661A CN202310129485.3A CN202310129485A CN116282661A CN 116282661 A CN116282661 A CN 116282661A CN 202310129485 A CN202310129485 A CN 202310129485A CN 116282661 A CN116282661 A CN 116282661A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 25
- 239000012141 concentrate Substances 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims description 98
- 239000012528 membrane Substances 0.000 claims description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 230000009615 deamination Effects 0.000 claims description 49
- 238000006481 deamination reaction Methods 0.000 claims description 49
- 238000007254 oxidation reaction Methods 0.000 claims description 36
- 230000003647 oxidation Effects 0.000 claims description 35
- 239000002068 microbial inoculum Substances 0.000 claims description 31
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 28
- 239000002131 composite material Substances 0.000 claims description 21
- 239000011941 photocatalyst Substances 0.000 claims description 20
- 241000588624 Acinetobacter calcoaceticus Species 0.000 claims description 19
- 240000001046 Lactobacillus acidophilus Species 0.000 claims description 19
- 235000013956 Lactobacillus acidophilus Nutrition 0.000 claims description 19
- 241000190932 Rhodopseudomonas Species 0.000 claims description 19
- 241001509286 Thiobacillus denitrificans Species 0.000 claims description 19
- 229940039695 lactobacillus acidophilus Drugs 0.000 claims description 19
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 18
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 18
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 18
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 18
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 11
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 11
- 230000004907 flux Effects 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 238000004064 recycling Methods 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- 241000894006 Bacteria Species 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- 229910021389 graphene Inorganic materials 0.000 claims description 9
- 238000004062 sedimentation Methods 0.000 claims description 9
- 239000006104 solid solution Substances 0.000 claims description 9
- 239000004408 titanium dioxide Substances 0.000 claims description 9
- 239000011787 zinc oxide Substances 0.000 claims description 9
- 238000006555 catalytic reaction Methods 0.000 claims description 8
- 238000005868 electrolysis reaction Methods 0.000 claims description 8
- 239000012466 permeate Substances 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 235000008504 concentrate Nutrition 0.000 abstract 2
- 235000014666 liquid concentrate Nutrition 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 18
- 230000001699 photocatalysis Effects 0.000 description 10
- 229910021529 ammonia Inorganic materials 0.000 description 9
- 238000007146 photocatalysis Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000003864 humus Substances 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 5
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- 238000005374 membrane filtration Methods 0.000 description 3
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- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 229920001282 polysaccharide Polymers 0.000 description 3
- 239000005017 polysaccharide Substances 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
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- 238000001704 evaporation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
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- 239000012530 fluid Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- -1 hydrogen ions Chemical class 0.000 description 2
- 238000001728 nano-filtration Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 125000004151 quinonyl group Chemical group 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 241000589291 Acinetobacter Species 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 239000002253 acid Substances 0.000 description 1
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- 238000006065 biodegradation reaction Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
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- 238000007654 immersion Methods 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 150000004681 metal hydrides Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
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- 230000003204 osmotic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- 230000001954 sterilising effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
-
- 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
- C02F1/58—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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2101/30—Organic compounds
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention provides a treatment method of landfill leachate concentrated solution, which comprises the following steps: the invention combines the characteristics of garbage penetrating liquid concentrate, and the comprehensive economical and environmental benefits, adopts a specific treatment method, so that the concentrate can reach the effluent discharge standard, and lays a foundation for the subsequent concentrate utilization technology.
Description
Technical Field
The invention relates to the technical field of garbage environment-friendly treatment, in particular to a treatment method of garbage leachate concentrated solution.
Background
The concentrated solution of landfill leachate membrane filtration refers to concentrated solution which is obtained by biodegradation of landfill leachate through a Membrane Bioreactor (MBR) and then is intercepted by a Nanofiltration (NF) membrane or a Reverse Osmosis (RO) membrane, the concentrated solution generally has no biodegradability, the concentrated solution cannot be discharged outwards and cannot be recharged to a landfill, the concentrated solution needs centralized treatment, the main component is humus substances, the concentrated solution is brownish black, has high COD (chemical oxygen demand) and contains a large amount of inorganic ions, and the concentrated solution directly discharges various organic and inorganic pollutants which are difficult to degrade and can pollute soil, surface water, ocean and the like; if discharged into a municipal sewage treatment system, the total dissolved solids which are too high are also unfavorable for the growth of activated sludge, and the landfill leachate concentrated solution is obtained by the process flows of filtering, sterilizing and the like after the anaerobic fermentation treatment of the wastewater generated by a landfill.
Aiming at the treatment of the garbage permeate concentrate, the recharging technology is currently used, so that the recovery rate can be improved, the membrane surface flushing flow rate is increased, but the defects of recharging gradually appear as time goes on, the accumulation of pollutants is caused in different degrees in domestic garbage landfills, the permeability conductivity is increased, the membrane water yield is reduced, and even the problem of membrane filtration failure caused by the increase of the conductivity occurs; the membrane technology is widely applied to garbage penetrating fluid, but the membrane cost is high, and the distillation flux is small;
the concentrated solution obtained by filtering the landfill leachate membrane by the immersion evaporation method generally contains a high proportion of chloride ions, and meanwhile, the chloride ions can cause extremely strong corrosion effect on metal materials in an environment at a temperature exceeding 70 ℃, so that equipment corrosion becomes a key limiting element for high-temperature evaporation treatment of the landfill leachate or the concentrated solution. Therefore, there is a need to develop a treatment method for efficiently degrading the garbage permeate concentrate to solve the above problems.
Disclosure of Invention
In view of the above, the present invention provides a method for treating landfill leachate concentrate, which solves the above problems.
The technical scheme of the invention is realized as follows: a treatment method of landfill leachate concentrated solution comprises the following steps: the method comprises the following steps:
s1, solid-liquid separation: sending the concentrated solution intercepted by the membrane into a sedimentation tank, standing for solid-liquid separation, and recycling sludge to obtain a concentrated solution I level;
s2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I with the input amount of 100-500mg/L, and standing at normal pressure and normal temperature for 2-5h to obtain concentrated solution II; reducing BOD in concentrate 5 And COD;
s3, deamination: delivering the concentrated solution I into a deamination membrane, and simultaneously introducing ozone with the ozone introducing amount of 1.5-2.3 mg/L to obtain deamination water and ammonium sulfate solution, and recycling the ammonium sulfate solution; ozone is introduced into the deamination membrane to play a deamination role, the ozone can be catalyzed and oxidized to generate hydroxyl free radicals, meanwhile, the mass transfer of the ozone is enhanced, the degradation speed of macromolecular organic pollutants is improved in the treatment process, meanwhile, the pollution of the deamination membrane can be relieved by the ozone and the free radicals generated by the ozone, and the water outlet quality is improved;
s4, electrolytic purification: purifying the ammonia water by electrolysis with current density of 250-350A/dm 2 Obtaining electrolyzed water; generating hydrogen ions or hydroxyl ions after ammonia removal and electrolysisFurther hydrolyzing with metal cations to form metal hydrides with surface charge and strong adsorption, and condensing organic or inorganic pollutants in the wastewater to separate the organic or inorganic pollutants from the wastewater, thereby improving the purification effect;
s5, electro-photocatalytic oxidation: adding the electrolyzed water into an electrocatalytic device for oxidation treatment, and adding a nano photocatalyst for ultraviolet light catalysis to obtain discharge water for discharge; the electrolyzed water generates hydrogen and oxygen to form tiny bubbles, so that flocculate or oil is attached to the bubbles, the bubbles are easy to remove, and a large amount of substances such as humus, protein or polysaccharide are effectively degraded; the photocatalytic oxidation attacks chromophore groups such as quinone structures, azo structures and the like in humus substances in the concentrated solution, damages benzene rings or nitrogen-nitrogen double bond structures in the chromophore groups, and is favorable for removing COD, chromaticity, copper ions and lead ions in the concentrated solution.
Further, the composite microbial inoculum comprises the following raw materials in parts by weight: 2-10 parts of thiobacillus denitrificans, 3-8 parts of rhodopseudomonas, 1.8-3.5 parts of lactobacillus acidophilus and 0.9-2.2 parts of acinetobacter calcoaceticus.
Further, the number of living bacteria of the thiobacillus denitrificans is more than 3.5X10 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.2-1.6X10 9 cfu/mL, the number of viable bacteria of Acinetobacter calcoaceticus is 4-10 multiplied by 10 8 cfu/mL。
Further, the deamination membrane is a PTFE deamination membrane, and the average membrane flux is 100-120L/(m) 2 H); the hydrophobic PTFE hollow fiber microporous membrane is adopted to separate the ammonia nitrogen-containing wastewater from the acid absorption liquid, and ammonia nitrogen in the concentrated solution can pass through micropores on the PTFE membrane wall of the membrane after being dissociated into gaseous NH 3.
Further, the voltage of the electrocatalytic oxidation of S5 is 18-25V, the current is 1-3A, and the time is 3-5h.
Further, the S5 nano photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 1-3:0.3-1.8:5.
Further, the ultraviolet light emitted by the ultraviolet light catalysis of the S5 has the wavelength of 250-256nmThe current density is 400-600A/m 2 The flow rate of the permeate liquid through the electrodes is 1-4m/s.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the garbage osmotic liquid membrane filtration concentrated solution is purified by a specific treatment method, the specific strains are selected by the composite microbial inoculum and combined according to the proportion, so that COD in the concentrated solution can be effectively reduced, deamination membrane deamination is carried out to form deamination water, the deamination membrane is filled with ozone, deamination effect is achieved, ozone can be catalyzed and oxidized to generate hydroxyl free radicals, meanwhile, mass transfer of ozone is enhanced, degradation speed of macromolecular organic pollutants is improved in the treatment process, and meanwhile, pollution of the deamination membrane and the free radicals generated by the ozone can be relieved, and water yielding quality is improved; electrolytic purification of ammonia removal water plays a role in condensing organic or inorganic pollutants in wastewater; the electrolytic water is subjected to oxidation treatment by combining electro-photocatalytic oxidation, so that flocculate or oil content is removed, a large amount of substances such as humus, protein or polysaccharide are effectively degraded, and meanwhile, the nano photocatalyst is used and the proportion of the substances is adjusted, so that the COD, chromaticity and metal ions in the concentrated solution can be obviously removed, and the conductivity in the concentrated solution is reduced;
the invention combines the characteristics of the garbage penetrating fluid concentrate, integrates economic and environmental benefits, adopts a specific treatment method to ensure that the concentrate reaches the effluent discharge standard, and lays a foundation for the subsequent concentrate utilization technology.
Detailed Description
In order to better understand the technical content of the present invention, the following provides specific examples to further illustrate the present invention.
The experimental methods used in the embodiment of the invention are conventional methods unless otherwise specified.
Materials, reagents, and the like used in the examples of the present invention are commercially available unless otherwise specified.
Example 1
A treatment method of landfill leachate concentrated solution comprises the following steps:
s1, solid-liquid separation: sending the concentrated solution intercepted by the membrane into a sedimentation tank for standing and solid-liquid separation, and carrying out enrichment, concentration and recovery on sludge to obtain a concentrated solution I level;
s2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I level, wherein the composite microbial inoculum comprises the following raw materials in parts by weight: 2 parts of thiobacillus denitrificans, 3 parts of rhodopseudomonas, 1.8 parts of lactobacillus acidophilus, 0.9 part of Acinetobacter calcoaceticus, and the viable count of the thiobacillus denitrificans is more than 3.5X10 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.2X10 9 cfu/mL, acinetobacter calcoaceticus viable count 4×10 8 cfu/mL with the input of 100mg/L, and standing for 2 hours at normal pressure and normal temperature to obtain concentrated solution II;
s3, deamination: delivering the concentrated solution I into a deamination membrane, wherein the deamination membrane is a PTFE deamination membrane, and the average membrane flux is 100L/(m) 2 H), ozone is simultaneously introduced, the ozone introducing amount is 1.5mg/L, ammonia removal water and ammonium sulfate solution are obtained, and the ammonium sulfate solution is recycled;
s4, electrolytic purification: purifying the ammonia water by electrolysis, wherein the current density is 250A/dm 2 Obtaining electrolyzed water;
s5, electro-photocatalytic oxidation: adding the electrolyzed water into an electrocatalytic device for oxidation treatment, wherein the electrocatalytic oxidation voltage is 18V, the current is 1A, the time is 3h, adding a nano photocatalyst for ultraviolet light catalysis, wherein the nano photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 1:0.3:5, the wavelength of ultraviolet light emitted by ultraviolet light catalysis is 250nm, and the current density is 400A/m 2 The flow rate of the permeated liquid passing through the electrode was 1m/s, and the discharged water was obtained to be discharged.
Example 2
A treatment method of landfill leachate concentrated solution comprises the following steps:
s1, solid-liquid separation: sending the concentrated solution trapped by the membrane into a sedimentation tank for standing and solid-liquid separation, and concentrating and recycling the sludge to obtain concentrated solution I level
S2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I level, wherein the composite microbial inoculum comprises the following raw materials in parts by weight: 10 parts of thiobacillus denitrificans, 8 parts of rhodopseudomonas, and,3.5 parts of lactobacillus acidophilus, 2.2 parts of Acinetobacter calcoaceticus and more than 3.5 multiplied by 10 of active bacteria number of thiobacillus denitrificans 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.6X10 9 cfu/mL, acinetobacter calcoaceticus viable count 10×10 8 cfu/mL with the input of 500mg/L, and standing for 5 hours at normal pressure and normal temperature to obtain concentrated solution II;
s3, deamination: delivering the concentrated solution I into a deamination membrane, wherein the deamination membrane is a PTFE deamination membrane, and the average membrane flux is 120L/(m) 2 H), ozone is simultaneously introduced, the ozone introducing amount is 2.3mg/L, ammonia removal water and ammonium sulfate solution are obtained, and the ammonium sulfate solution is recycled;
s4, electrolytic purification: purifying the ammonia water by electrolysis with current density of 350A/dm 2 Obtaining electrolyzed water;
s5, electro-photocatalytic oxidation: adding the electrolyzed water into an electrocatalytic device for oxidation treatment, wherein the electrocatalytic oxidation voltage is 25V, the current is 3A, the time is 5h, adding a nano photocatalyst for ultraviolet light catalysis, wherein the nano photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 3:1.8:5, the wavelength of ultraviolet light emitted by ultraviolet light catalysis is 256nm, and the current density is 600A/m 2 The flow rate of the permeated liquid passing through the electrode was 4m/s, and the discharged water was obtained to be discharged.
Example 3
A treatment method of landfill leachate concentrated solution comprises the following steps:
s1, solid-liquid separation: sending the concentrated solution trapped by the membrane into a sedimentation tank for standing and solid-liquid separation, and concentrating and recycling the sludge to obtain concentrated solution I level
S2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I level, wherein the composite microbial inoculum comprises the following raw materials in parts by weight: 6 parts of thiobacillus denitrificans, 5 parts of rhodopseudomonas, 2.5 parts of lactobacillus acidophilus and 1.5 parts of Acinetobacter calcoaceticus, wherein the number of viable bacteria of the thiobacillus denitrificans is more than 3.5 multiplied by 10 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.4X10 9 cfu/mL, acinetobacter calcoaceticusViable count 7×10 8 cfu/mL with the input of 300mg/L is subjected to standing treatment for 3 hours at normal pressure and normal temperature, so as to obtain concentrated solution II;
s3, deamination: delivering the concentrated solution I into a deamination membrane, wherein the deamination membrane is a PTFE deamination membrane, and the average membrane flux is 110L/(m) 2 H), ozone is simultaneously introduced, the ozone introducing amount is 1.9mg/L, ammonia removal water and ammonium sulfate solution are obtained, and the ammonium sulfate solution is recycled;
s4, electrolytic purification: purifying the ammonia water by electrolysis with current density of 300A/dm 2 Obtaining electrolyzed water;
s5, electro-photocatalytic oxidation: adding the electrolyzed water into an electrocatalytic device for oxidation treatment, wherein the electrocatalytic oxidation voltage is 22V, the current is 2A, the time is 3-5h, adding a nano photocatalyst for ultraviolet photocatalysis, wherein the nano photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 2:1.2:5, the wavelength of ultraviolet light emitted by ultraviolet photocatalysis is 254nm, and the current density is 500A/m 2 The flow rate of the permeated liquid passing through the electrode was 3m/s, and the discharged water was obtained to be discharged.
Example 4
A treatment method of landfill leachate concentrated solution comprises the following steps:
s1, solid-liquid separation: sending the concentrated solution trapped by the membrane into a sedimentation tank for standing and solid-liquid separation, and concentrating and recycling the sludge to obtain concentrated solution I level
S2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I level, wherein the composite microbial inoculum comprises the following raw materials in parts by weight: 2 parts of thiobacillus denitrificans, 3 parts of rhodopseudomonas, 1.8 parts of lactobacillus acidophilus, 0.9 part of Acinetobacter calcoaceticus, and the viable count of the thiobacillus denitrificans is more than 3.5X10 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.4X10 9 cfu/mL, acinetobacter calcoaceticus viable count 7×10 8 cfu/mL with the input of 300mg/L is subjected to standing treatment for 3 hours at normal pressure and normal temperature, so as to obtain concentrated solution II;
s3, deamination: delivering the concentrated solution I into a deamination membrane, wherein the deamination membrane is PTFE deamination membrane and an average membraneThe flux was 110L/(m) 2 H), ozone is simultaneously introduced, the ozone introducing amount is 1.9mg/L, ammonia removal water and ammonium sulfate solution are obtained, and the ammonium sulfate solution is recycled;
s4, electrolytic purification: purifying the ammonia water by electrolysis with current density of 300A/dm 2 Obtaining electrolyzed water;
s5, electro-photocatalytic oxidation: adding the electrolyzed water into an electrocatalytic device for oxidation treatment, wherein the electrocatalytic oxidation voltage is 22V, the current is 2A, the time is 3-5h, adding a nano photocatalyst for ultraviolet photocatalysis, wherein the nano photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 2:1.2:5, the wavelength of ultraviolet light emitted by ultraviolet photocatalysis is 254nm, and the current density is 500A/m 2 The flow rate of the permeated liquid passing through the electrode was 3m/s, and the discharged water was obtained to be discharged.
Example 5
A treatment method of landfill leachate concentrated solution comprises the following steps:
s1, solid-liquid separation: sending the concentrated solution trapped by the membrane into a sedimentation tank for standing and solid-liquid separation, and concentrating and recycling the sludge to obtain concentrated solution I level
S2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I level, wherein the composite microbial inoculum comprises the following raw materials in parts by weight: 10 parts of thiobacillus denitrificans, 8 parts of rhodopseudomonas, 3.5 parts of lactobacillus acidophilus, 2.2 parts of acinetobacter calcoaceticus and more than 3.5 multiplied by 10 of viable bacteria of the thiobacillus denitrificans 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.4X10 9 cfu/mL, acinetobacter calcoaceticus viable count 7×10 8 cfu/mL with the input of 300mg/L is subjected to standing treatment for 3 hours at normal pressure and normal temperature, so as to obtain concentrated solution II;
s3, deamination: delivering the concentrated solution I into a deamination membrane, wherein the deamination membrane is a PTFE deamination membrane, and the average membrane flux is 110L/(m) 2 H), ozone is simultaneously introduced, the ozone introducing amount is 1.9mg/L, ammonia removal water and ammonium sulfate solution are obtained, and the ammonium sulfate solution is recycled;
s4, electrolytic purification: purifying the ammonia water by electrolysisChanging into a current with the density of 300A/dm 2 Obtaining electrolyzed water;
s5, electro-photocatalytic oxidation: adding the electrolyzed water into an electrocatalytic device for oxidation treatment, wherein the electrocatalytic oxidation voltage is 22V, the current is 2A, the time is 3-5h, adding a nano photocatalyst for ultraviolet photocatalysis, wherein the nano photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 2:1.2:5, the wavelength of ultraviolet light emitted by ultraviolet photocatalysis is 254nm, and the current density is 500A/m 2 The flow rate of the permeated liquid passing through the electrode was 3m/s, and the discharged water was obtained to be discharged.
Example 6
The difference between the embodiment and the embodiment 3 is that the composite microbial inoculum comprises the following raw materials in parts by weight: 1 part of thiobacillus denitrificans, 10 parts of rhodopseudomonas, 5 parts of lactobacillus acidophilus and 1 part of acinetobacter calcoaceticus.
Example 7
The difference between this example and example 3 is that the complex microbial inoculum does not contain Acinetobacter calcoaceticus.
Example 8
The difference between this example and example 3 is that the nano-photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 1:3:1.
1. Test verification
Setting 8 groups of experiments corresponding to the treatment methods of the above examples 1-8, and analyzing pH, COD, NH of the treated garbage permeate concentrate 3 -N、TN、NO 3- -N、BOD 5 COD and chromaticity.
(1) Raw water quality: the membrane concentrate of the refuse osmosis membrane is obtained from RO membrane post-concentrate of the permeate of a refuse landfill in Hainan province, and the water quality analysis is shown in Table 1:
TABLE 1 Water quality analysis of landfill leachate concentrate
(2) The testing method comprises the following steps:
(3) Reduction ratio% = (raw water index concentration-treated index concentration)/raw water concentration×100
(4) Test results:
the above results show that the treatment method of the invention effectively purifies the garbage permeate concentrated solution, and the specific strains are selected to be combined according to the proportion in the examples 1-5 and the examples 6 and 7, so that the COD in the concentrated solution can be effectively reduced, and the specific proportion in the nano photocatalyst can obviously remove COD, chromaticity and metal ions in the concentrated solution and reduce the conductivity in the concentrated solution in the examples 1-5 and the example 8; wherein the effect achieved in example 3 is more pronounced.
(5) Comparison of BOD 5 COD water inlet and outlet concentration variation
| Inflow of water | Effluent water | |
| Example 1 | 0.03 | 0.34 |
| Example 2 | 0.03 | 0.35 |
| Example 3 | 0.03 | 0.33 |
| Example 4 | 0.03 | 0.30 |
| Example 5 | 0.03 | 0.29 |
| Example 6 | 0.03 | 0.16 |
| Example 7 | 0.03 | 0.15 |
| Example 8 | 0.03 | 0.28 |
From the results of examples 6 and 7 in the table above, the specific strains are selected to be combined according to the proportion by the composite microbial inoculum, so that the biodegradability of the concentrated solution is greatly improved, and the subsequent biochemical treatment is facilitated.
The following comparative tests were set up for the above results, specifically as follows:
comparative example 1
The difference between the comparative example and the example 3 is that the concentrated solution I in the step S3 is sent into the deamination membrane without ozone, in particular to a treatment method of landfill leachate concentrated solution, which comprises the following steps:
s1, solid-liquid separation: sending the concentrated solution trapped by the membrane into a sedimentation tank for standing and solid-liquid separation, and concentrating and recycling the sludge to obtain concentrated solution I level
S2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I level, wherein the composite microbial inoculum comprises the following raw materials in parts by weight: 6 parts of thiobacillus denitrificans, 5 parts of rhodopseudomonas, 2.5 parts of lactobacillus acidophilus and 1.5 parts of Acinetobacter calcoaceticus, wherein the number of viable bacteria of the thiobacillus denitrificans is more than 3.5 multiplied by 10 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.4X10 9 cfu/mL, acinetobacter calcoaceticus viable count 7×10 8 cfu/mL with the input of 300mg/L is subjected to standing treatment for 3 hours at normal pressure and normal temperature, so as to obtain concentrated solution II;
s3, deamination: delivering the concentrated solution I into a deamination membrane, wherein the deamination membrane is a PTFE deamination membrane, and the average membrane flux is 110L/(m) 2 H) obtaining ammonia removal water and ammonium sulfate solution, and recycling the ammonium sulfate solution;
s4, electrolytic purification: purifying the ammonia water by electrolysis with current density of 65A/dm 2 Obtaining electrolyzed water;
s5, electro-photocatalytic oxidation: adding the electrolyzed water into an electrocatalytic device for oxidation treatment, wherein the electrocatalytic oxidation voltage is 22V, the current is 2A, the time is 3-5h, adding a nano photocatalyst for ultraviolet photocatalysis, wherein the nano photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 2:1.2:5, the wavelength of ultraviolet light emitted by ultraviolet photocatalysis is 254nm, and the current density is 500A/m 2 The flow rate of the permeated liquid passing through the electrode was 3m/s, and the discharged water was obtained to be discharged.
Comparative example 2
The difference between this comparative example and example 3 is that the electrocatalytic oxidation is only performed in S5, specifically a treatment method of landfill leachate concentrate, comprising the following steps:
s1, solid-liquid separation: sending the concentrated solution trapped by the membrane into a sedimentation tank for standing and solid-liquid separation, and concentrating and recycling the sludge to obtain concentrated solution I level
S2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I level, wherein the composite microbial inoculum comprises the following raw materials in parts by weight: 6 parts of thiobacillus denitrificans, 5 parts of rhodopseudomonas, 2.5 parts of lactobacillus acidophilus and 1.5 parts of Acinetobacter calcoaceticus, wherein the number of viable bacteria of the thiobacillus denitrificans is more than 3.5 multiplied by 10 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.4X10 9 cfu/mL, acinetobacter calcoaceticus viable count 7×10 8 cfu/mL with the input of 300mg/L is subjected to standing treatment for 3 hours at normal pressure and normal temperature, so as to obtain concentrated solution II;
s3, deamination: delivering the concentrated solution I into a deamination membrane, wherein the deamination membrane is a PTFE deamination membrane, and the average membrane flux is 110L/(m) 2 H), ozone is simultaneously introduced, the ozone introducing amount is 1.9mg/L, ammonia removal water and ammonium sulfate solution are obtained, and the ammonium sulfate solution is recycled;
s4, electrolytic purification: purifying the ammonia water by electrolysis with current density of 65A/dm 2 Obtaining electrolyzed water;
s5, electrocatalytic oxidation: and adding the electrolyzed water into an electrocatalytic device for oxidation treatment, wherein the electrocatalytic oxidation voltage is 22V, the electrocatalytic oxidation current is 2A, and the time is 3-5h, so as to obtain discharge water for discharge.
Comparative examples were measured according to the above test methods and the results were as follows:
compared with the comparative example 1, the deamination film is filled with ozone, so that the ozone can be catalyzed and oxidized to generate hydroxyl free radicals, meanwhile, the mass transfer of the ozone is enhanced, the degradation speed of macromolecular organic pollutants is improved in the treatment process, and the water outlet quality is improved; compared with comparative example 2, the embodiment 3 combines the electro-photo catalytic oxidation, the electro-catalytic oxidation is mutually cooperated through various oxidation reactions, organic matters are thoroughly decomposed into carbon dioxide and water, nano-photo catalyst is added after the electro-catalytic oxidation for photo catalysis, a large amount of substances such as humus, protein or polysaccharide can be degraded, and simultaneously chromophores such as quinone structures, azo structures and the like in humus substances in the concentrated solution are attacked, and benzene rings or nitrogen-nitrogen double bond structures in the chromophores are destroyed, so that the invention is favorable for removing COD, chromaticity and metal ions in the concentrated solution.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A method for treating landfill leachate concentrated solution is characterized in that: the method comprises the following steps:
s1, solid-liquid separation: sending the concentrated solution intercepted by the membrane into a sedimentation tank for standing and solid-liquid separation, and carrying out enrichment, concentration and recovery on sludge to obtain a concentrated solution I level;
s2, treating a microbial inoculum: adding a composite microbial inoculum into the concentrated solution I with the input amount of 100-500mg/L, and standing at normal pressure and normal temperature for 2-5h to obtain concentrated solution II;
s3, deamination: delivering the concentrated solution I into a deamination membrane, and simultaneously introducing ozone with the ozone introducing amount of 1.5-2.3 mg/L to obtain deamination water and ammonium sulfate solution, and recycling the ammonium sulfate solution;
s4, electrolytic purification: purifying the ammonia water by electrolysis with current density of 250-350A/dm 2 Obtaining electrolyzed water;
s5, electro-photocatalytic oxidation: and adding the electrolyzed water into an electrocatalytic device for oxidation treatment, and adding a nano photocatalyst for ultraviolet light catalysis to obtain discharged water for discharge.
2. A method of treating a landfill leachate concentrate according to claim 1, wherein: the composite microbial inoculum of the S2 comprises the following raw materials in parts by weight: 2-10 parts of thiobacillus denitrificans, 3-8 parts of rhodopseudomonas, 1.8-3.5 parts of lactobacillus acidophilus and 0.9-2.2 parts of acinetobacter calcoaceticus.
3. A method of treating a landfill leachate concentrate according to claim 2, wherein: the number of the active bacteria of the thiobacillus denitrificans is more than 3.5 multiplied by 10 8 cfu/mL, the number of living rhodopseudomonas is more than 2 multiplied by 10 8 cfu/mL, the viable count of Lactobacillus acidophilus is 1.2-1.6X10 9 cfu/mL, the number of viable bacteria of Acinetobacter calcoaceticus is 4-10 multiplied by 10 8 cfu/mL。
4. A method of treating a landfill leachate concentrate according to claim 1, wherein: the deamination membrane of the S3 is a PTFE deamination membrane, and the average membrane flux is 100-120L/(m) 2 ·h)。
5. A method of treating a landfill leachate concentrate according to claim 1, wherein: the voltage of the electrocatalytic oxidation of the S5 is 18-25V, the current is 1-3A, and the time is 3-5h.
6. A method of treating a landfill leachate concentrate according to claim 1, wherein: the S5 nano photocatalyst is a nano solid solution composed of titanium dioxide, zinc oxide and graphene in a mass ratio of 1-3:0.3-1.8:5.
7. A method of treating a landfill leachate concentrate according to claim 1, wherein: the ultraviolet light emitted by the ultraviolet light catalysis of the S5 has the wavelength of 250-256nm and the current density of 400-600A/m 2 The flow rate of the permeate liquid through the electrodes is 1-4m/s.
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