CN112723667A - Method for treating high-salinity wastewater of sodium trichloropyridinol - Google Patents
Method for treating high-salinity wastewater of sodium trichloropyridinol Download PDFInfo
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- CN112723667A CN112723667A CN202011496318.5A CN202011496318A CN112723667A CN 112723667 A CN112723667 A CN 112723667A CN 202011496318 A CN202011496318 A CN 202011496318A CN 112723667 A CN112723667 A CN 112723667A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 43
- UWICOIBBNNVXFV-UHFFFAOYSA-N sodium;3,4,5-trichloro-1h-pyridin-2-one Chemical compound [Na].ClC1=CNC(=O)C(Cl)=C1Cl UWICOIBBNNVXFV-UHFFFAOYSA-N 0.000 title claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 88
- 241000894006 Bacteria Species 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 239000002131 composite material Substances 0.000 claims abstract description 30
- 239000011734 sodium Substances 0.000 claims abstract description 27
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 27
- -1 sodium alkoxide Chemical class 0.000 claims abstract description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 29
- 230000001580 bacterial effect Effects 0.000 claims description 22
- 238000004062 sedimentation Methods 0.000 claims description 20
- 230000001112 coagulating effect Effects 0.000 claims description 16
- 238000005273 aeration Methods 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 9
- WLARTYCFUUGKSW-UHFFFAOYSA-N ClC1=C(C(=NC=C1)Cl)Cl.[Na] Chemical compound ClC1=C(C(=NC=C1)Cl)Cl.[Na] WLARTYCFUUGKSW-UHFFFAOYSA-N 0.000 claims description 5
- 238000004065 wastewater treatment Methods 0.000 abstract description 12
- 150000003839 salts Chemical class 0.000 abstract description 9
- 231100000086 high toxicity Toxicity 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 37
- 230000000694 effects Effects 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 20
- 230000008569 process Effects 0.000 description 18
- 230000001105 regulatory effect Effects 0.000 description 15
- 230000015556 catabolic process Effects 0.000 description 11
- 238000006731 degradation reaction Methods 0.000 description 11
- 244000005700 microbiome Species 0.000 description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 8
- 229910052698 phosphorus Inorganic materials 0.000 description 8
- 239000011574 phosphorus Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000010865 sewage Substances 0.000 description 7
- 208000028659 discharge Diseases 0.000 description 6
- 238000005286 illumination Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 239000000543 intermediate Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000005944 Chlorpyrifos Substances 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- SBPBAQFWLVIOKP-UHFFFAOYSA-N chlorpyrifos Chemical compound CCOP(=S)(OCC)OC1=NC(Cl)=C(Cl)C=C1Cl SBPBAQFWLVIOKP-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002101 nanobubble Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 230000000243 photosynthetic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 238000007347 radical substitution reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 241001446247 uncultured actinomycete Species 0.000 description 1
- 230000003442 weekly effect Effects 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing 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
- C02F1/52—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
-
- 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
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
-
- 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
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/284—Anaerobic digestion processes using anaerobic baffled reactors
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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- 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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- Water Supply & Treatment (AREA)
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- Water Treatment By Sorption (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to the technical field of organic wastewater treatment, in particular to a method for treating high-salt wastewater of sodium trichloropyridinol, which comprises an ABR treatment step, an SBR treatment step and a denitrification treatment step which are sequentially carried out; in the ABR treatment step, activated carbon particles and EMO composite bacteria liquid are added into the wastewater. The technical problems of large residual quantity of sodium alkoxide and high chromaticity of wastewater after harmless treatment of wastewater containing 3,5, 6-trichloropyridine-2-sodium alkoxide can be solved. The scheme can be applied to the practical operation of harmless treatment of the sodium alkoxide wastewater with high salt concentration, high toxicity and high chroma, and has the advantages of good system repeatability, long-term high-efficiency operation, low operation cost and the like.
Description
Technical Field
The invention relates to the technical field of organic wastewater treatment, in particular to a method for treating high-salinity wastewater containing trichloropyridine sodium alcoholate.
Background
The 3,5, 6-trichloropyridine-2-sodium alcoholate (sodium alcoholate for short) is one of important intermediates for synthesizing pesticide chlorpyrifos, the waste water produced in the production process contains chlorobenzene, trichloropyridine sodium alcoholate and other various organic matters, and the waste water has the characteristics of high salt concentration, high toxicity, high chroma (the waste water with low content of sodium alcoholate can turn red after being illuminated), difficult biodegradation and the like.
Chinese patent CN103922531A discloses the following technical scheme: the micro-nano bubble technology is combined with the iron-carbon micro-electrolysis technology. Carrying out aeration micro-electrolysis on the wastewater containing 3,5, 6-trichloropyridine-2-sodium alcoholate, and then treating the wastewater by combining the Fenton oxidation-flocculation sedimentation-distillation process. The method needs to install a large-scale electrolysis device and a large-scale distillation device, so that the cost is increased, and after the method is used for treating the wastewater, the treated wastewater still contains a small amount of sodium alkoxide, and the color of the wastewater still turns red after illumination.
Disclosure of Invention
The invention aims to provide a method for treating high-salinity wastewater containing trichloropyridine sodium alcoholate, which aims to solve the technical problems of large residual quantity of sodium alcoholate and high chromaticity of wastewater after harmless treatment of wastewater containing 3,5, 6-trichloropyridine-2-sodium alcoholate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for treating high-salinity wastewater containing trichloropyridinol sodium comprises the steps of ABR treatment, SBR treatment and denitrification treatment which are sequentially carried out; in the ABR treatment step, wastewater is added into an ABR tank, and the wastewater is treated by using activated carbon particles and EMO composite bacteria liquid.
The principle and the advantages of the scheme are as follows: by sequentially carrying out ABR treatment, SBR treatment and denitrification treatment on the high-salinity wastewater containing the 3,5, 6-trichloropyridine-2-sodium alcoholate, organic matters in the wastewater are degraded, the COD value, the ammonia nitrogen content and the total phosphorus content in the wastewater are reduced, more importantly, the 3,5, 6-trichloropyridine-2-sodium alcoholate is fully degraded, and the treated wastewater does not show the condition of color development after illumination. In the scheme, in the ABR treatment step, the activated carbon particles and the EMO composite bacteria liquid are added into the wastewater simultaneously, and a physical biochemical treatment method combining activated carbon adsorption and salt-tolerant microbial biochemical degradation is adopted, so that the distribution of organic matters can be more concentrated by the adsorption effect of the activated carbon, and the microorganisms can be propagated rapidly in a large amount, thereby efficiently degrading the organic matters in the wastewater. Because the salt concentration in the wastewater is high, if the EMO compound bacteria liquid is directly used, the activity of the EMO compound bacteria can be seriously influenced, but after the activated carbon is added, the activity of the EMO compound bacteria is greatly enhanced, so that the wastewater treatment efficiency is improved.
In the scheme, ABR (Anaerobic Baffled Reactor) treatment is Anaerobic treatment, and mainly aims to realize the conversion of organic matters difficult to biodegrade through hydrolysis and non-hydrolysis, and through molecular structure change (ring opening, bond breaking, cracking, radical substitution, reduction and the like), organic matter molecules which are complex in structure and difficult to biodegrade are converted into organic matters capable of being biodegraded slowly or rapidly, so that the biotreatability and the decoloration effect of sewage are obviously improved. SBR (Sequencing Batch Reactor Activated Sludge Process) is a sewage treatment technology in an intermittent aeration mode, and COD (chemical oxygen demand) value, sodium alkoxide, ammonia nitrogen and total phosphorus content of wastewater are further reduced through aerobic treatment. Finally, nitrate in the wastewater is reduced into nitrogen through denitrification treatment and denitrification. Through the steps, the high-salinity wastewater containing the 3,5, 6-trichloropyridine-2-sodium alkoxide can be treated into water meeting the discharge standard, wherein the sodium alkoxide content is low, and the phenomenon that the color still turns red after illumination cannot occur. The scheme is simple to operate, the equipment is common equipment in the prior art, the equipment is easy to obtain, the system repeatability is good, the long-term high-efficiency operation can be realized, and the operation cost is low.
Further, in the ABR treatment step, the mesh number of the active carbon particles is 1-6 meshes, and the dosage is 5-8 kg; the bacterium density of EMO composite bacterium liquid is 0.2-7 × 106The dosage is 3-5L per ml.
By adopting the technical scheme, the 1-6-mesh active carbon particles are used as adsorbents of organic matters and impurities in the wastewater, and provide carriers and sufficient nutrients for salt-tolerant microorganisms. Experiments have shown that in the ABR treatment step, too high a mesh number and too small a particle size of the activated carbon particles are used, and although impurities may be better adsorbed (larger specific surface area), the supporting effect on bacteria and the growth state of bacteria are not ideal. The reason for the analysis of the inventor is that the ABR treatment process is an anaerobic process, and activated carbon with a proper particle size can provide an ideal anaerobic environment for bacteria, thereby improving the activity of the bacteria to decompose organic matters.
Further, in the ABR treatment step, the temperature of the wastewater is controlled to be 25-35 ℃, and the pH value is controlled to be 6-9.
By adopting the technical scheme, the temperature and the pH value are suitable for the EMO microorganisms to grow in the ABR pool.
Further, obtaining wastewater I through an ABR treatment step; in the SBR treatment step, the wastewater I is treated by using activated carbon powder and EMO composite bacterial liquid, and the sedimentation ratio of the activated carbon powder is kept at 10-15% by aeration.
By adopting the technical scheme, in the SBR treatment step, the organic matters in the wastewater are further degraded under the synergistic action of the activated carbon and the EMO bacteria.
Furthermore, in the SBR treatment step, the mesh number of the activated carbon powder is 30-80 meshes, and the dosage is 10-15 kg; the bacterium density of EMO composite bacterium liquid is 0.2-7 × 106The dosage is 6-10L per ml; controlling the temperature of the wastewater I to be 25-35 ℃ and the pH value to be 6-9.
By adopting the technical scheme, in the step, the selection of the particle size of the activated carbon is important, and the activated carbon powder with the size of 30-80 meshes has large specific surface area, can fully adsorb organic matters in wastewater, and provides a good support effect for aerobic bacteria in EMO composite bacteria. The inventor replaces the activated carbon powder with activated carbon particles, finds that the sewage treatment effect of the system is poor, and further verifies the key effect of the activated carbon particle size on the step. The above temperatures and pH values are suitable for EMO microorganisms to grow in SBR tanks.
Further, obtaining wastewater II through the SBR treatment step; in the denitrification treatment step, the wastewater II is treated by using the activated carbon particles and EMO composite bacterial liquid, and is aerated at the same time.
By adopting the technical scheme, the denitrification treatment step can remove the nitrate in the wastewater, and further improve the water quality.
Further, in the denitrification treatment step, the mesh number of the active carbon particles is 1-6 meshes, and the dosage is 3-7 kg; the bacterium density of EMO composite bacterium liquid is 0.2-7 × 1062-4L of the extract per ml.
By adopting the technical scheme, the 1-6-mesh active carbon particles are used as adsorbents of organic matters and impurities in the wastewater, and provide carriers and sufficient nutrients for salt-tolerant microorganisms. Experiments prove that in the denitrification treatment step, the active carbon particles with too high mesh number and too small particle size can better adsorb impurities (larger specific surface area), but the supporting effect on bacteria is not ideal. The inventor analyzes the reason that the denitrification process is a micro-anaerobic process, and the activated carbon with proper particle size can provide ideal anaerobic environment for bacteria, thereby improving the activity of the bacteria for decomposing organic matters.
Further, in the denitrification treatment step, the temperature of the wastewater II is controlled to be 25-35 ℃, and the pH value is controlled to be 6-9; the duration of the denitrification treatment step was 28 h.
By adopting the technical scheme, the temperature and the pH value are suitable for the growth of EMO microorganisms, denitrification can be fully performed for 28 hours, and nitrate in the wastewater is reduced into nitrogen.
Further, obtaining wastewater III through a denitrification treatment step; the method also comprises a coagulating sedimentation treatment step after the denitrification treatment step: adding polyaluminum chloride accounting for 1-3 per mill of the mass of the wastewater III and polyacrylamide accounting for 0.1-0.3 per mill of the mass of the wastewater III into the wastewater III; the duration of the coagulating sedimentation treatment step is 1 h.
By adopting the technical scheme, after the high-salinity sodium alkoxide wastewater is treated by adopting a method combining activated carbon adsorption and halotolerant bacteria biochemical treatment, the wastewater is flocculated by using a flocculating agent, so that organic matters in the wastewater can be effectively degraded and removed, the COD (chemical oxygen demand) degradation rate can reach 96.4%, the total phosphorus degradation rate is 98.3%, the ammonia nitrogen degradation rate is 73% -80%, sodium alkoxide can be completely removed, the effluent is colorless and transparent, the color is not changed after illumination, and the index reaches the secondary discharge standard (GB 8978-1996).
Further, the concentration of the chloride ions in the wastewater is increased from 5000-8000mg/L to 15000-16000mg/L at the rate of 800-1000mg/L weekly, and then the concentration of the chloride ions in the wastewater is maintained at 15000-16000mg/L, and the concentration of sodium alkoxide in the wastewater is less than 1200 mg/L.
By adopting the technical scheme, the concentration of substances in the wastewater is regulated and controlled in a gradual change mode, and the effect of sewage treatment is positively promoted. The microorganism needs to adapt to the high-salinity environment in the wastewater gradually in the acclimatization process, the initial chloride ion concentration is 5000-8000mg/L, the chloride ion concentration in the wastewater is increased every week, the increment every week is 800-1000mg/L, and the optimal sewage treatment effect of the system can be ensured by adopting the form.
Detailed Description
The following is further detailed by way of specific embodiments:
example 1:
the embodiment of the invention is directed to an overall process flow, and the process flow of the method for treating high-salinity wastewater containing sodium trichloropyridinol is as follows:
collecting step of adjusting tank
The process carries out harmless treatment on high-salt mixed sodium alkoxide wastewater (wastewater for short), and the wastewater is firstly conveyed into a regulating tank. The temperature of the regulating reservoir is 30-35 ℃, the pH value is 7.0-8.0, the regulating reservoir plays a role in collecting and storing wastewater, and the volume of the regulating reservoir is 100L in the embodiment.
ABR treatment step
The wastewater enters an ABR pool through a lift pump, hydrolysis acidification reaction is carried out in the ABR pool, macromolecular organic matters are degraded into micromolecular substances, and partial pollutants are removed. In the embodiment, the number of the ABR pools is six, the volume of each ABR pool is 73.6L, 5-8kg of activated carbon particles (1-6 meshes) and 3-5L of EMO composite bacterial liquid are simultaneously added into each ABR pool, the water temperature of the ABR pool is controlled to be 25-35 ℃, the pH value is controlled to be 6-9, and wastewater is acidified and hydrolyzed for 96 hours.
SBR treatment step
After the wastewater is treated by the ABR tank, wastewater I is obtained, and the wastewater I flows to the SBR system for aeration treatment. The SBR system comprises two SBR tanks which are connected in parallel and alternately work, the volume of each SBR tank is 289L, the switching period of the two SBR tanks is 24h, namely, each SBR tank works for 24h and stops for 24h, the two SBR tanks alternately work, and the working temperature is 25-35 ℃ and the working pH value is 6-9. The work flow of a single SBR pool is as follows: and (3) feeding water (wastewater I) for 12 hours, aerating while feeding water, continuously aerating for 8 hours after water feeding is finished, stopping aeration, naturally settling for 3 hours, discharging all the wastewater I within 1 hour (namely discharging all the wastewater entering the SBR tank in 12 hours), and treating by the SBR tank to obtain wastewater II. The wastewater II flows into an intermediate tank (a transfer tank which only plays the role of temporarily storing the wastewater II). 6-10L of EMO composite bacterial liquid and 10-15kg of activated carbon powder (30-80 meshes) are added into each SBR tank. During the aeration process, the aeration rate needs to be controlled and adjusted to maintain the sedimentation ratio of the activated carbon powder in the ABR tank at 10-15% (in practical operation, the equipment is used for detection once a day to ensure that the sedimentation ratio is maintained at 10-15% through aeration).
Denitrification treatment step
And the wastewater II in the intermediate tank enters a denitrification tank through a lift pump, the volume of the denitrification tank is 73.6L, and 3-7kg of activated carbon particles (1-6 meshes) and 2-4L of EMO composite bacterial liquid are added into the denitrification tank. The denitrification treatment time is 28h, the water temperature is 25-35 ℃, the pH value is 6-9, the wastewater II is aerated in the running process of the denitrification tank, and the aeration quantity is controlled to have the level of a small amount of bubbles emitted from the top of the digestion tank.
Coagulating sedimentation treatment step
And performing denitrification treatment to obtain wastewater III, adding PAC (polyaluminium chloride, cas: 1327-41-9) and PAM (polyacrylamide, cas: 9003-5-8) with the mass of 1-3 per mill and 0.1-0.3 per mill of the mass of the wastewater III into a coagulative precipitation tank, wherein the treatment time is 1h, and the water quality reaches the standard and then is discharged.
In the above process, the strain in EMO composite bacterial liquid is halophilic microorganism, and photosynthetic bacteria are used as main component, and the strain comprises more than 20 kinds of microorganisms of more than 100, such as actinomycete group, lactic acid bacteria group, yeast bacteria group, etc., and the concentration of the biological viable bacteria preparation is 0.2-7 × 10, which is synthesized by forming a mutual beneficial coexisting symbiotic system among the microorganisms6The product can be used in 0.2-2.5mol/L high-salinity wastewater environment. The EMO composite bacterial liquid used in the scheme is a commercial strain purchased from Hunan XiangTan Jianyuan Biotechnology development Ltd (JE-3 series).
The design of the process has the following water quality requirements: COD is less than 2800mg/L, ammonia nitrogen is less than 150mg/L, total phosphorus is less than 100mg/L, chloride ions are less than 18000mg/L, total salt is less than 30000mg/L, PH is 7-8, and the designed daily treatment capacity is 100L/d. The treatment process has certain requirements on the water quality change of wastewater inlet water (wastewater quality gradually changes), and takes the concentration of chloride ions as a calculation reference, and specifically comprises the following steps: when the wastewater enters an ABR pool for the first time (at the moment, fresh activated carbon particles and EMO composite bacteria liquid are just added into the ABR pool), the chloride ion concentration of the wastewater is 5000-8000mg/L, the chloride ion concentration in the wastewater is increased every week, the increment every week is 800-1000mg/L until the chloride ion concentration reaches a higher level (15000-16000mg/L), and meanwhile, the concentration of sodium alkoxide in the inlet water reaches the concentration at which sodium alkoxide can be completely decomposed by a system (the upper limit of the sodium alkoxide concentration is 1200 mg/L). Then the wastewater is continuously treated by maintaining the inlet water concentration (the concentration of chloride ions: 15000-16000mg/L and the concentration of sodium alkoxide less than 1200 mg/L).
The effluent quality index requirement of the process is as follows: COD is less than or equal to 120mg/L, ammonia nitrogen is less than or equal to 50mg/L, total phosphorus is less than or equal to 1mg/L, chloride ions are less than or equal to 18000mg/L, total salt is less than or equal to 30000mg/L, PH is 6-9, the color is colorless and transparent, and the color is not changed after illumination.
Example 2-example 4 wastewater treatment was carried out according to the process flow of example 1, as follows: in the collecting step of the regulating reservoir, the temperature of the regulating reservoir is maintained between 30 and 35 ℃, and the pH value is maintained between 7.0 and 8.0; in the ABR treatment step, 7kg of activated carbon particles (4 meshes) and 4L of EMO compound bacterial liquid (4 multiplied by 10) are simultaneously added into each ABR pool6One/ml) and maintaining the temperature of the water in the ABR pool at 25-35 ℃ and the pH value at 6-9; in the SBR treatment step, 8L of EMO composite bacterial liquid (4 multiplied by 10) is added into each SBR tank6Pieces/ml) and 13kg of activated carbon powder (50 meshes), and maintaining the water temperature of the SBR pool at 25-35 ℃ and the pH value at 6-9; in the denitrification step, 5kg of activated carbon particles (4 meshes) and 3L of EMO composite bacterial liquid (4 multiplied by 10) are added into a denitrification tank6One/ml) and maintaining the water temperature of the denitrification tank between 25 and 35 ℃ and the pH value between 6 and 9; in the step of coagulating sedimentation treatment, PAC with the mass of 2 per mill of the mass of the wastewater III is added into a coagulating sedimentation tankAnd 0.2% o of PAM. Example 2-example 4 show a continuous process, the three examples differing in the sampling time. The sampling time of example 2 was 5000mg/L of chloride ion concentration and 8200mg/L of total salt concentration of the wastewater of example 2 at the end of the first week of wastewater treatment. The sampling time of example 3 was such that at the end of the eleventh week of wastewater treatment, the chloride ion concentration of the wastewater in example 3 was 14900mg/L and the total salt concentration was 24800 mg/L. The sampling time of example 4 is that at the end of the fifteenth week, the chloride ion concentration of the wastewater in example 4 is 18120mg/L, and the total salt concentration is 30200mg/L, at which time the water quality slightly exceeds the design inlet water (wastewater) quality requirement. In the actual operation process, when the concentration of the chloride ions in the wastewater to be treated is close to and lower than the upper limit of the water inlet index (the concentration of the chloride ions is 18000mg/L), the ion concentration of the wastewater is maintained and cannot rise any more. In examples 2 to 4, the composition of the wastewater collected by the inflow adjusting tank is described in detail in "initial wastewater" section in Table 2, and the quality of the wastewater treated by the ABR tank is described in detail in "ABR tank". The water quality condition of the wastewater treated by the SBR tank is shown in the item of the SBR tank (as the sample is too turbid, the PAC with the mass fraction of 0.25 percent needs to be added for clarification treatment, and then all parameters can be detected). The water quality of the wastewater treated by the denitrification tank is detailed in the item of 'denitrification tank' (similarly, as the sample is too turbid, PAC with the mass fraction of 0.25% needs to be added for clarification treatment, and then all parameters can be detected).
Table 1: example 2 to example 4 test results
As can be seen from Table 1, the experimental results of example 2 show that the system has an obvious effect of treating the sodium trichloropyridinol wastewater at the concentration, the effluent can meet the requirements of the secondary discharge standard, the COD degradation rate is 96.3%, the total phosphorus degradation rate is 99.3%, the ammonia nitrogen degradation rate is 80.9%, and the sodium trichloropyridinol can be thoroughly decomposed. The experimental result of the embodiment 3 shows that the system has obvious effect of treating the waste water containing the trichloropyridinol sodium under the concentration, the effluent can reach the secondary discharge standard, the COD degradation rate is 96.9 percent, the total phosphorus degradation rate is 98.8 percent, the ammonia nitrogen degradation rate is 73.8 percent, and the trichloropyridinol sodium can be thoroughly decomposed. The experimental result of example 4 shows that after the system treats the wastewater containing trichloropyridine sodium alcoholate under the concentration, the effluent index is slightly higher than the secondary discharge standard, the color is yellow after illumination, and the degradation of the system to sodium alcoholate reaches saturation. Since the water quality of the influent water of example 4 is slightly above design influent (wastewater) quality requirements, the final effluent quality is slightly above specification. However, the inventor finds that the finally obtained treated wastewater meets the secondary discharge standard by adopting the method of gradually increasing the concentration of chloride ions in the wastewater in the example 1 as long as the water inlet requirements (the design water quality requirements of COD <2800mg/L, ammonia nitrogen <150mg/L, total phosphorus <100mg/L, chloride ions <18000mg/L, total salts <30000mg/L and PH 7-8) are met. Wherein the theoretical maximum limit of the chloride ion concentration is 18000mg/L, but in practical operation, the chloride ion concentration of the wastewater to be treated is generally maintained at 15000-16000mg/L in the later stage of wastewater treatment.
Comparative example 1
The comparative example is slightly adjusted on the basis of the example 1, and specifically comprises the following steps: in the collecting step of the regulating reservoir, the temperature of the regulating reservoir is maintained between 30 and 35 ℃, and the pH value is maintained between 7.0 and 8.0; in the ABR treatment step, 7kg of activated carbon powder (50 meshes) and 4L of EMO compound bacteria liquid (4 multiplied by 10) are simultaneously added into each ABR pool6One/ml) and maintaining the temperature of the water in the ABR pool at 25-35 ℃ and the pH value at 6-9; in the SBR treatment step, 8L of EMO composite bacterial liquid (4 multiplied by 10) is added into each SBR tank6Pieces/ml) and 13kg of activated carbon powder (50 meshes), and maintaining the water temperature of the SBR pool at 25-35 ℃ and the pH value at 6-9; in the denitrification step, 5kg of activated carbon powder (50 meshes) and 3L of EMO composite bacterial liquid (4 multiplied by 10) are added into a denitrification tank6One/ml) and maintaining the water temperature of the denitrification tank between 25 and 35 ℃ and the pH value between 6 and 9; in the step of the coagulating sedimentation treatment, the coagulation sedimentation treatment is carried out,PAC with the mass of 2 thousandths of that of the wastewater III and PAM with the mass of 0.2 thousandths of that of the wastewater are added into the coagulating sedimentation tank.
Comparative example 2
The comparative example is slightly adjusted on the basis of the example 1, and specifically comprises the following steps: in the collecting step of the regulating reservoir, the temperature of the regulating reservoir is maintained between 30 and 35 ℃, and the pH value is maintained between 7.0 and 8.0; in the ABR treatment step, 7kg of activated carbon particles (4 meshes) and 4L of EMO compound bacterial liquid (4 multiplied by 10) are simultaneously added into each ABR pool6One/ml) and maintaining the temperature of the water in the ABR pool at 25-35 ℃ and the pH value at 6-9; in the SBR treatment step, 8L of EMO composite bacterial liquid (4 multiplied by 10) is added into each SBR tank6Pieces/ml) and 13kg of activated carbon particles (4 meshes) and maintaining the water temperature of the SBR pool between 25 and 35 ℃ and the pH value between 6 and 9; in the denitrification step, 5kg of activated carbon particles (4 meshes) and 3L of EMO composite bacterial liquid (4 multiplied by 10) are added into a denitrification tank6One/ml) and maintaining the water temperature of the denitrification tank between 25 and 35 ℃ and the pH value between 6 and 9; in the step of coagulating sedimentation treatment, PAC with the mass of 2 thousandths and PAM with the mass of 0.2 thousandths of the mass of the wastewater III are added into a coagulating sedimentation tank.
Comparative example 3
The comparative example is slightly adjusted on the basis of the example 1, and specifically comprises the following steps: in the collecting step of the regulating reservoir, the temperature of the regulating reservoir is maintained between 30 and 35 ℃, and the pH value is maintained between 7.0 and 8.0; in the ABR treatment step, 7kg of activated carbon particles (4 meshes) are added into each ABR tank, the water temperature of the ABR tank is maintained between 25 and 35 ℃, and the pH value is maintained between 6 and 9; in the SBR treatment step, 13kg of activated carbon powder (50 meshes) is added into each SBR tank, and the water temperature of the SBR tank is maintained between 25 ℃ and 35 ℃ and the pH value is maintained between 6 and 9; in the denitrification treatment step, 5kg of activated carbon particles (4 meshes) are added into a denitrification tank, the water temperature of the denitrification tank is maintained between 25 and 35 ℃, and the pH value is maintained between 6 and 9; in the step of coagulating sedimentation treatment, PAC with the mass of 2 thousandths and PAM with the mass of 0.2 thousandths of the mass of the wastewater III are added into a coagulating sedimentation tank.
Comparative example 4
The comparative example is slightly adjusted on the basis of the example 1, and specifically comprises the following steps: in the collecting step of the regulating reservoir, the temperature of the regulating reservoir is maintained between 30 and 35 ℃, and the pH value is maintained between 7.0 and 8.0; in the ABR treatment step, each ABAdding 4L EMO composite bacterial liquid (4X 10) into the R tank6One/ml) and maintaining the temperature of the water in the ABR pool at 25-35 ℃ and the pH value at 6-9; in the SBR treatment step, 8L of EMO composite bacterial liquid (4 multiplied by 10) is added into each SBR tank6Seed/ml) and maintaining the water temperature of the SBR pool at 25-35 ℃ and the pH value at 6-9; in the denitrification step, 3L of EMO composite bacterial liquid (4 multiplied by 10) is added into a denitrification tank6One/ml) and maintaining the water temperature of the denitrification tank between 25 and 35 ℃ and the pH value between 6 and 9; in the step of coagulating sedimentation treatment, PAC with the mass of 2 thousandths and PAM with the mass of 0.2 thousandths of the mass of the wastewater III are added into a coagulating sedimentation tank.
Comparative example 5
The comparative example is slightly adjusted on the basis of the example 1, and specifically comprises the following steps: the concentration of chloride ions in the wastewater is not gradually changed, but the wastewater with the concentration of the chloride ions being 10000mg/L is constantly injected.
For comparative examples 1 to 4, wastewater was fed into the system and treated according to the procedure of example 1. For comparative examples 1 to 5, samples were taken for examination until the end of the first week of wastewater treatment, and the examination results are shown in Table 2.
Table 2: test results of comparative examples 1 to 5
Combining the experimental results of tables 1 and 2, comparative example 1 uses activated carbon powder (50 mesh) in both the ABR tank and the denitrification tank, compared to examples 2-4, but in comparative example 1, the sodium alkoxide content could not be reduced to an ideal level, and the wastewater still had relatively severe light coloration. The particle size of the activated carbon is important for maintaining the activity of the EMO bacteria. In the ABR tank and the denitrification tank, activated carbon particles with larger particle size are used, so that better wastewater treatment effect can be obtained. Comparative example 2 compared with examples 2-4, comparative example 2 used activated carbon particles (4 mesh) in the SBR tank, but in comparative example 2, the sodium alkoxide content could not be reduced to an ideal level and the wastewater still exhibited a relatively severe light coloration. In the SBR tank, better wastewater treatment effect can be obtained by using activated carbon powder with smaller particle size. Compared with the comparative examples 3 and 4 and the examples 2 to 4, the active carbon and the bacterial liquid are used independently, the wastewater treatment effect is poor, and the active carbon and the bacterial liquid are used together for synergism, so that a better wastewater treatment effect can be obtained. Comparative example 5 shows that the concentration of the substances in the wastewater is gradually controlled and has a positive promoting effect on the sewage treatment effect compared with examples 2 to 4. The microorganism needs to adapt to the high-salinity environment in the wastewater gradually in the acclimatization process, the initial chloride ion concentration is 5000-8000mg/L, the chloride ion concentration in the wastewater is increased every week, the increment every week is 800-1000mg/L, and the optimal sewage treatment effect of the system can be ensured by adopting the form.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A method for treating high-salinity wastewater containing trichloropyridine sodium alcoholate is characterized by comprising the steps of ABR treatment, SBR treatment and denitrification treatment which are sequentially carried out; in the ABR treatment step, wastewater is added into an ABR tank, and the wastewater is treated by using activated carbon particles and EMO composite bacteria liquid.
2. The method for treating high-salinity wastewater containing sodium trichloropyridinol according to claim 1, wherein in the ABR treatment step, the mesh number of the activated carbon particles is 1-6 meshes, and the dosage is 5-8 kg; the bacterium density of EMO composite bacterium liquid is 0.2-7 × 106The dosage is 3-5L per ml.
3. The method for treating high-salinity wastewater containing sodium trichloropyridinol according to claim 2, wherein in the ABR treatment step, the temperature of the wastewater is controlled to be 25-35 ℃, and the pH value is controlled to be 6-9.
4. The method for treating high-salt wastewater of sodium trichloropyridinol according to claim 3, characterized in that wastewater I is obtained through ABR treatment step; in the SBR treatment step, the wastewater I is treated by using activated carbon powder and EMO composite bacterial liquid, and the sedimentation ratio of the activated carbon powder is kept at 10-15% by aeration.
5. The method for treating high-salinity wastewater containing sodium trichloropyridinol according to claim 4, wherein in the SBR treatment step, the mesh number of the activated carbon powder is 30-80 meshes, and the dosage is 10-15 kg; the bacterium density of EMO composite bacterium liquid is 0.2-7 × 106The dosage is 6-10L per ml; controlling the temperature of the wastewater I to be 25-35 ℃ and the pH value to be 6-9.
6. The method for treating high-salinity wastewater containing sodium trichloropyridinol according to claim 5, characterized in that wastewater II is obtained through the SBR treatment step; in the denitrification treatment step, the wastewater II is treated by using the activated carbon particles and EMO composite bacterial liquid, and is aerated at the same time.
7. The method for treating high-salinity wastewater containing sodium trichloropyridinol according to claim 6, characterized in that in the denitrification treatment step, the mesh number of the activated carbon particles is 1-6 meshes, and the dosage is 3-7 kg; the bacterium density of EMO composite bacterium liquid is 0.2-7 × 1062-4L of the extract per ml.
8. The method for treating high-salinity wastewater containing sodium trichloropyridinol according to claim 7, characterized in that in the denitrification treatment step, the temperature of the wastewater II is controlled to be 25-35 ℃, and the pH value is controlled to be 6-9; the duration of the denitrification treatment step was 28 h.
9. The method for treating high-salinity wastewater containing sodium trichloropyridinol according to claim 8, characterized in that wastewater III is obtained through a denitrification treatment step; the method also comprises a coagulating sedimentation treatment step after the denitrification treatment step: adding polyaluminum chloride accounting for 1-3 per mill of the mass of the wastewater III and polyacrylamide accounting for 0.1-0.3 per mill of the mass of the wastewater III into the wastewater III; the duration of the coagulating sedimentation treatment step is 1 h.
10. The method as claimed in claims 1-9, wherein the concentration of chloride ion in the wastewater is increased from 5000-8000mg/L to 15000-16000mg/L at a rate of 800-1000mg/L each week, and then the concentration of chloride ion in the wastewater is maintained at 15000-16000mg/L, and the concentration of sodium alkoxide in the wastewater is less than 1200 mg/L.
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