CN114890633A - Treatment system and method for organic wastewater generated in battery assembly in automobile industry - Google Patents
Treatment system and method for organic wastewater generated in battery assembly in automobile industry Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 33
- 230000003647 oxidation Effects 0.000 claims abstract description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
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- 230000016615 flocculation Effects 0.000 claims description 24
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- 238000006243 chemical reaction Methods 0.000 claims description 19
- 239000010802 sludge Substances 0.000 claims description 19
- 239000002957 persistent organic pollutant Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 238000005842 biochemical reaction Methods 0.000 claims description 7
- 239000002244 precipitate Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000006396 nitration reaction Methods 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 239000013049 sediment Substances 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 4
- 238000005188 flotation Methods 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 239000003945 anionic surfactant Substances 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 244000005700 microbiome Species 0.000 claims description 3
- 238000009300 dissolved air flotation Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 2
- 238000009388 chemical precipitation Methods 0.000 abstract description 2
- 239000006228 supernatant Substances 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012028 Fenton's reagent Substances 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 230000001070 adhesive effect Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment system and a treatment method for organic wastewater assembled by batteries in the automobile industry. The invention utilizes a chemical precipitation method, an advanced oxidation method, a biochemical treatment method and a multi-medium filtration method to remove suspended particles, refractory organics, total nitrogen and ammonia nitrogen in the organic wastewater of battery assembly in the automobile industry, improve the biodegradability of the wastewater, reduce the treatment difficulty and realize the effective treatment of the organic wastewater of battery assembly in the automobile industry.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a system and a method for treating organic wastewater generated in battery assembly in the automobile industry.
Background
Batteries have a long history of development, ranging from "voltaic stacks" over 200 years ago to lead-acid, nickel-cadmium, dry cell, lead storage batteries, and are now widely used in the electronics, automotive and industrial markets. The lithium battery is a novel environment-friendly battery with high capacity and long service life, and consists of positive and negative plates and a solid electrolyte. A plurality of lithium batteries are connected in series to form a battery pack, so that the new energy automobile is called as a new energy automobile, and the concept of environmental protection is realized.
The lithium iron phosphate is used as the anode material of the lithium ion battery, and has strong application value in the energy storage market and the electric automobile market by virtue of good compatibility, high energy density, long cycle life, high temperature performance and safety performance. However, a significant problem in the development of lithium iron phosphate materials is that some waste water which is difficult to treat is inevitably generated in the production, and insoluble substances, soluble organic substances and harmful substances exist in the waste water after cleaning equipment water, cooling water, floor cleaning water and some raw material waste liquid.
In the existing battery assembly organic wastewater treatment process, the most typical process is a physical and chemical reaction and evaporation process, suspended particulate matters in water are removed through the physical and chemical reaction and then enter an evaporator for concentration, condensed water is recycled, and concentrated solution is treated outside. The process has the obvious disadvantages that: 1. the evaporation process is adopted, so that the initial investment is large, the steam (electricity) energy consumption is large, and the operation, maintenance and repair costs are large; 2. the produced concentrated solution has high treatment cost; 3. the organic components in the wastewater can not be maintained stably along with the change of yield, and the use effect of the evaporator is influenced.
Disclosure of Invention
The invention aims to solve the problems and provides a system and a method for treating organic wastewater generated in battery assembly in the automobile industry.
According to the technical scheme, the treatment system for the organic wastewater assembled by the batteries in the automobile industry comprises a coagulation/flocculation unit, an air floatation treatment unit, a Fenton oxidation unit, an anaerobic treatment unit, an anoxic/aerobic treatment unit, an advanced treatment unit and a sludge tank;
the coagulation/flocculation unit is connected with a dosing device I, and a water outlet of the coagulation/flocculation unit is communicated with a water inlet of the air floatation treatment unit; the water outlet of the air floatation treatment unit is communicated with the water inlet of the Fenton oxidation unit; the Fenton oxidation unit is connected with a dosing device II, and a water outlet of the Fenton oxidation unit is communicated with a water inlet of the anaerobic treatment unit; the water outlet of the anaerobic treatment unit is communicated with the water inlet of the anoxic/aerobic treatment unit; the water outlet of the anoxic/aerobic treatment unit is communicated with the water inlet of the advanced treatment unit; a filter is arranged in the advanced treatment unit; the sludge tank is respectively communicated with sludge discharge ports of the coagulation/flocculation unit, the air floatation unit, the Fenton oxidation unit, the anaerobic treatment unit and the anoxic/aerobic treatment unit.
Specifically, the coagulation/flocculation unit is used for removing suspended particles in the organic wastewater of the battery assembly in the automobile industry, and the supernatant after precipitation is output to the air floatation treatment unit;
the air floatation treatment unit is used for carrying out air floatation reaction on the supernatant of the coagulation/flocculation unit, further removing fine suspended particles in water and anionic surfactant in the water, and the supernatant after mud-water separation is output to the Fenton oxidation unit;
the Fenton oxidation unit is used for carrying out Fenton oxidation reaction on the supernatant of the air floatation treatment unit, oxidizing refractory organic pollutants, improving the biodegradability of wastewater, and outputting the supernatant after precipitation to the anaerobic treatment unit;
the anaerobic reaction unit is used for carrying out anaerobic biochemical reaction on the supernatant of the Fenton oxidation unit to further degrade organic pollutants, and the supernatant after precipitation is output to the anoxic/aerobic treatment unit;
the anoxic/aerobic treatment unit is used for carrying out nitration and denitrification reactions on the supernatant of the anaerobic treatment unit to further degrade organic pollutants and total nitrogen, and the supernatant after precipitation is output to the advanced treatment unit;
the advanced treatment unit is used for carrying out advanced treatment on the supernatant of the anoxic/aerobic treatment unit, and removing residual suspended particles, microorganisms and the like in water through the physical and chemical adsorption capacities of quartz sand and activated carbon, so that the stable standard-reaching discharge of the organic wastewater of the battery assembly in the automobile industry is realized.
Furthermore, the filter adopts quartz sand and active carbon as media.
In another aspect of the invention, a method for treating organic wastewater from battery assembly in the automobile industry is provided, which comprises the following steps,
s1: organic wastewater assembled by a battery in the automobile industry enters a coagulation/flocculation unit, suspended particles are removed under the action of alkali, slaked lime, polyaluminium chloride (PAC) and Polyacrylamide (PAM), and the removed suspended particles form precipitates and are discharged into a sludge tank;
s2: the treated effluent of the coagulation/flocculation unit enters an air floatation treatment unit for air floatation reaction to remove fine suspended particles and anionic surfactant, and sediment formed by the air floatation reaction is discharged into a sludge tank;
s3: the treated effluent of the air floatation treatment unit enters a Fenton oxidation unit to carry out Fenton oxidation reaction, so that organic pollutants which are difficult to degrade are oxidized, the biodegradability of the wastewater is improved, and precipitates formed by Fenton oxidation are discharged into a sludge tank;
s4: the treated effluent of the Fenton oxidation unit enters an anaerobic treatment unit for anaerobic biochemical reaction to further degrade organic pollutants, and sediment formed by the anaerobic biochemical reaction is discharged into a sludge tank;
s5: the treated effluent of the anaerobic treatment unit enters an anoxic/aerobic treatment unit for nitration and denitrification reactions to further degrade organic pollutants and total nitrogen, and precipitates formed by the nitration and denitrification reactions are discharged into a sludge tank;
s6: the treated effluent of the anoxic/aerobic treatment unit enters an advanced treatment unit for advanced treatment, and residual suspended particulate matters and microorganisms are removed under the action of a filter, so that the treatment of the organic wastewater of the battery assembly in the automobile industry is completed.
Specifically, the organic wastewater for battery assembly in the automobile industry contains carbon black, an adhesive (mainly N-methylpyrrolidone (NMP)), a small amount of electrolyte, salt, a surfactant and the like which are used in the battery assembly process, wherein the organic matter concentration is 5000mg/L, the pH value is 8-9, the suspended matter concentration is 1200 mg/L, and the total nitrogen concentration is 250 mg/L.
Further, the alkali is sodium hydroxide.
Further, in step S1, the pH value in the coagulation/flocculation unit is controlled to be 9-12.
Further, in the step S1, the total reaction time of the organic wastewater from the battery assembly in the automobile industry in the coagulation/flocculation unit is 60-80 min.
Further, in the step S2, the air flotation reaction is a dissolved air flotation reaction, the upward flow rate of the contact tank is 10-14mm/S, the reflux ratio is controlled at 35-45%, and the dissolved air pressure is 0.45 MPa.
Further, in step S3, the pH value is controlled to 3 to 4 in the fenton oxidation reaction, and the pH is adjusted by adding an acid (e.g., sulfuric acid). The Fenton reagent adopts 27.5Aqueous solution of wt% hydrogen peroxide, H 2 0 2 COD control 2-2.5 (mass ratio); h 2 0 2 And (pure) Fe (ferrous sulfate) control 10-12.
Further, in the step S4, the anaerobic biochemical reaction time is 16-20 h.
Further, in the step S5, the anaerobic stage stays for 6-8 hours, the aerobic stage stays for 8-12 hours, and the reflux ratio of the aerobic mixed liquid is 2-4.
Further, in the step S6, the height of the filtering layer of the filter is 1.0-1.2m, and the filtering speed is 8-12m 3 /m 2 ·h。
Compared with the prior art, the technical scheme of the invention has the following advantages: the invention utilizes a chemical precipitation method, an advanced oxidation method, a biochemical treatment method and a multi-medium filtration method to remove suspended particles, refractory organics, total nitrogen and ammonia nitrogen in the organic wastewater of battery assembly in the automobile industry, improve the biodegradability of the wastewater, reduce the treatment difficulty and realize the effective treatment of the organic wastewater of battery assembly in the automobile industry.
Drawings
Fig. 1 is a schematic structural diagram of a treatment system for organic wastewater from battery assembly in the automotive industry in example 1.
Fig. 2 is a schematic flow chart of a method for treating organic wastewater from battery assembly in the automobile industry in example 1.
Description of reference numerals: 1-coagulation/flocculation unit, 2-air-flotation treatment unit, 3-Fenton oxidation unit, 4-anaerobic treatment unit, 5-anoxic/aerobic treatment unit, 6-advanced treatment unit, 7-dosing device I and 8-dosing device II.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example 1
As shown in fig. 1, the treatment system for organic wastewater assembled by batteries in the automobile industry comprises a coagulation/flocculation unit 1, an air flotation treatment unit 2, a fenton oxidation unit 3, an anaerobic treatment unit 4, an anoxic/aerobic treatment unit 5, an advanced treatment unit 6 and a sludge tank (not shown).
Wherein, the coagulation/flocculation unit 1 is connected with a dosing device I7, and a water outlet of the coagulation/flocculation unit 1 is communicated with a water inlet of the air floatation treatment unit 2; the water outlet of the air floatation treatment unit 2 is communicated with the water inlet of the Fenton oxidation unit 3; the Fenton oxidation unit 3 is connected with a dosing device II 8, and a water outlet of the Fenton oxidation unit 3 is communicated with a water inlet of the anaerobic treatment unit 4; the water outlet of the anaerobic treatment unit 4 is communicated with the water inlet of the anoxic/aerobic treatment unit 5; the water outlet of the anoxic/aerobic treatment unit 5 is communicated with the water inlet of the advanced treatment unit 6; the sludge tank is respectively communicated with sludge discharge ports of the coagulation/flocculation unit, the air floatation treatment unit, the Fenton oxidation unit, the anaerobic treatment unit and the anoxic/aerobic treatment unit.
Example 2
Method for treating organic wastewater of battery assembly in automobile industry (as shown in figure 2)
The waste water is organic waste water in a battery assembly workshop of a certain automobile production enterprise, and the quality of the waste water is as follows: CODcr concentration was 2570mg/L, pH 8.1, and total nitrogen concentration was 183 mg/L.
The wastewater firstly enters a coagulation/flocculation unit, sodium hydroxide is automatically added through a pH meter to adjust and keep the pH value to be more than 9.0, and a solution agent is added to prepare the wastewater with the concentration of 30 wt%; adding slaked lime with the concentration of 800mg/L and adding a suspension medicament with the concentration of 30 wt%; adding polyaluminium chloride (PAC) with the concentration of 200mg/L and adding a solution agent with the concentration of 10 wt%; the concentration of the added anionic polyacrylamide (PAM-) is 20mg/L, the preparation concentration of the added solution medicament is 0.1 wt%, and the molecular weight of the anionic polyacrylamide (PAM-) is 1200-2000 ten thousand. After the total reaction time reaches 60min, black precipitates are generated, the CODcr concentration of clear liquid after passing through the air floatation unit is 1857mg/L, and the removal rate is 27.74%.
The wastewater enters a Fenton oxidation unit, sulfuric acid is automatically added through a pH meter to adjust and maintain the pH value to be 3.0-4.0, and a solution agent is added to prepare the wastewater with the concentration of 30 wt%; adding Fenton reagent and precipitating to obtain supernatant with the concentration of 1320 mg/L. After precipitation, the supernatant is automatically added with sodium hydroxide through a pH meter to adjust and maintain the pH value at 7.5-8.5, and enters an anaerobic reaction unit and an anoxic/aerobic reaction unit. Precipitating the biochemically treated wastewater, wherein the CODcr concentration of the supernatant is 87mg/L, and the removal rate is 93.41%; the total nitrogen concentration was 14.80mg/L, and the removal rate was 91.91%. Then, the water is further filtered by a deep treatment unit through quartz sand and an active carbon filter, and the turbidity of the sand and carbon filtered water is less than or equal to 5 NTU.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A treatment system for organic wastewater assembled by batteries in the automobile industry is characterized by comprising a coagulation/flocculation unit, an air floatation treatment unit, a Fenton oxidation unit, an anaerobic treatment unit, an anoxic/aerobic treatment unit, an advanced treatment unit and a sludge tank;
the coagulation/flocculation unit is connected with a dosing device I, and a water outlet of the coagulation/flocculation unit is communicated with a water inlet of the air floatation treatment unit; the water outlet of the air floatation treatment unit is communicated with the water inlet of the Fenton oxidation unit; the Fenton oxidation unit is connected with a dosing device II, and a water outlet of the Fenton oxidation unit is communicated with a water inlet of the anaerobic treatment unit; the water outlet of the anaerobic treatment unit is communicated with the water inlet of the anoxic/aerobic treatment unit; the water outlet of the anoxic/aerobic treatment unit is communicated with the water inlet of the advanced treatment unit; a filter is arranged in the advanced treatment unit; the sludge tank is respectively communicated with sludge discharge ports of the coagulation/flocculation unit, the air floatation unit, the Fenton oxidation unit, the anaerobic treatment unit and the anoxic/aerobic treatment unit.
2. The organic wastewater treatment system for battery assembly in the automobile industry as recited in claim 1, wherein the filter uses quartz sand and activated carbon as media.
3. A method for treating organic wastewater from battery assembly in the automobile industry, which is characterized in that the treatment system of claim 1 or 2 is adopted, and comprises the following steps,
s1: organic wastewater assembled by a battery in the automobile industry enters a coagulation/flocculation unit, suspended particles are removed under the action of alkali, slaked lime, polyaluminium chloride and polyacrylamide, and the removed suspended particles form sediment and are discharged into a sludge tank;
s2: the treated effluent of the coagulation/flocculation unit enters an air floatation treatment unit for air floatation reaction to remove fine suspended particles and anionic surfactant, and sediment formed by the air floatation reaction is discharged into a sludge tank;
s3: the treated effluent of the air floatation treatment unit enters a Fenton oxidation unit to carry out Fenton oxidation reaction, so that organic pollutants which are difficult to degrade are oxidized, the biodegradability of the wastewater is improved, and precipitates formed by Fenton oxidation are discharged into a sludge tank;
s4: the treated effluent of the Fenton oxidation unit enters an anaerobic treatment unit for anaerobic biochemical reaction to further degrade organic pollutants, and sediment formed by the anaerobic biochemical reaction is discharged into a sludge tank;
s5: the treated effluent of the anaerobic treatment unit enters an anoxic/aerobic treatment unit for nitration and denitrification reactions to further degrade organic pollutants and total nitrogen, and precipitates formed by the nitration and denitrification reactions are discharged into a sludge tank;
s6: the treated effluent of the anoxic/aerobic treatment unit enters an advanced treatment unit for advanced treatment, and residual suspended particles and microorganisms are removed under the action of a filter, so that the treatment of the organic wastewater of the battery assembly in the automobile industry is completed.
4. The method for treating organic wastewater from battery assembly in automobile industry as claimed in claim 3, wherein in step S1, the pH value in the coagulation/flocculation unit is controlled to 9-12.
5. The method for treating organic wastewater from battery assembly in automobile industry according to claim 3 or 4, wherein in step S1, the total reaction time of organic wastewater from battery assembly in automobile industry in coagulation/flocculation unit is 60-80 min.
6. The method for treating organic wastewater from battery assembly in the automobile industry as recited in claim 3, wherein, in the step S2, the air flotation reaction is a dissolved air flotation reaction, the upward flow velocity of the contact tank is 10-14mm/S, the reflux ratio is controlled to be 35% -45%, and the dissolved air pressure is 0.45 MPa.
7. The method for treating organic wastewater from battery assembly in automobile industry according to claim 3, wherein in step S3, pH is controlled to 3-4 in Fenton oxidation reaction.
8. The method for treating organic wastewater from battery assembly in automobile industry according to claim 3, wherein in step S4, the anaerobic biochemical reaction time is 16-20 h.
9. The method for treating organic wastewater from battery assembly in automobile industry as claimed in claim 3, wherein in step S5, the anaerobic stage is kept for 6-8h, the aerobic stage is kept for 8-12h, and the reflux ratio of the aerobic mixture is 2-4.
10. The method for treating organic wastewater from battery assembly in automobile industry as claimed in claim 3, wherein in step S6, the height of filter layer of the filter is 1.0-1.2m, and the filtering speed is 8-12m 3 /m 2 ·h。
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