CN111995168A - Recycling process of daily chemical wastewater - Google Patents
Recycling process of daily chemical wastewater Download PDFInfo
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- CN111995168A CN111995168A CN202010658266.0A CN202010658266A CN111995168A CN 111995168 A CN111995168 A CN 111995168A CN 202010658266 A CN202010658266 A CN 202010658266A CN 111995168 A CN111995168 A CN 111995168A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 73
- 239000000126 substance Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004064 recycling Methods 0.000 title claims abstract description 21
- 239000004094 surface-active agent Substances 0.000 claims abstract description 36
- 239000006260 foam Substances 0.000 claims abstract description 33
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 239000010865 sewage Substances 0.000 claims abstract description 7
- 239000003960 organic solvent Substances 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 11
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 claims description 8
- 239000003945 anionic surfactant Substances 0.000 claims description 7
- 239000002736 nonionic surfactant Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000000376 reactant Substances 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 claims description 3
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 claims description 3
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000005188 flotation Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 9
- 239000012071 phase Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000013543 active substance Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000011859 microparticle Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 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 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 150000004996 alkyl benzenes Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000019387 fatty acid methyl ester Nutrition 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 description 1
- 235000013923 monosodium glutamate Nutrition 0.000 description 1
- 239000004223 monosodium glutamate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000006277 sulfonation reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000000271 synthetic detergent Substances 0.000 description 1
- 239000002699 waste material Substances 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
- C02F1/001—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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F2101/301—Detergents, surfactants
-
- 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
- C02F2101/40—Organic compounds containing sulfur
-
- 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
- C02F2103/002—Grey water, e.g. from clothes washers, showers or dishwashers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
-
- 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
Abstract
The invention provides a recycling treatment process of daily chemical wastewater, which comprises the steps of wastewater collection, air flotation treatment, foam separation, surfactant recovery and Fenton treatment. The method has the advantages of simple process steps, convenient operation, low cost and no pollutant generation. Meanwhile, the surfactant in the wastewater is recycled as a resource, so that the discharge of harmful pollutants is reduced, the recovery of useful resources is realized, and the method is a sustainable sewage treatment technology.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a recycling treatment process of daily chemical wastewater.
Background
The washing powder is an alkaline synthetic detergent, and is made up by using anionic surfactant, small quantity of non-ionic surfactant and some adjuvant, phosphate, silicate, anhydrous sodium sulphate, fluorescent agent and enzyme through the processes of mixing and spraying powder, etc.. In the manufacturing process of the washing powder, sulfonation reaction is generally involved, so that the discharged wastewater is alkaline, and cooling water is required in the reaction process.
The surfactant is called as 'industrial monosodium glutamate', and has wide application in various fields of national production and life. However, once the surfactant is used, the surfactant is directly discharged into the natural environment, and the surfactant discharged into the natural environment is easy to foam, so that the oxygen exchange between the water body and the environment is isolated, and the water body smells. The synthesis of the surfactant usually requires special equipment and consumes a large amount of resources, so that the surfactant is directly discharged into the natural environment after being treated and is also a serious waste of resources. In recent years, with the increasingly perfect relevant regulations of environmental control by the environmental protection department of China and the increasingly tense land use area of enterprises, the treatment of daily chemical wastewater by using the conventional biochemical treatment process cannot meet the environmental protection requirements of the enterprises.
In the wastewater recovery treatment in the washing powder workshop, how to reuse the surfactant in the wastewater is to ensure that the treated wastewater can reach the discharge standard is a popular research direction.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a recycling treatment process of daily chemical wastewater
The technical scheme adopted by the invention is as follows:
a recycling treatment process of daily chemical wastewater comprises the following steps:
1) collecting waste water: and (3) washing the production equipment by using cooling water, so that the daily chemical wastewater flows into the regulating tank through the sewage pipe after relatively large surface impurities are removed by the grille.
The method of the step is to adjust the uniform water quality and ensure that the subsequent treatment process can continuously and stably run.
2) Air floatation treatment: and (3) sending the wastewater in the regulating tank into an air floatation tank by a lifting pump for physicochemical treatment, removing a part of COD and most of suspended matters, separating oil particles and micro particles in the solution, and finally realizing full solid-liquid separation.
3) Foam separation: introducing pressurized air into the wastewater obtained in the step 2), forming a large number of micro bubbles in the water, enabling the surfactant in the wastewater to be adsorbed on the surface of gas, and separating the foam from the wastewater through a foam separation tower.
The foam separation is based on the principle of adsorption, and bubbles are bubbled into the liquid containing surface active substances, so that the surface active substances in the liquid are gathered on a gas-liquid interface (the surface of bubbles), a foam layer is formed above the liquid main body, and the foam layer is separated from the liquid main body, so that the purposes of concentrating the surface active substances (in the foam layer) and purifying the liquid main body can be achieved. The bubbles and the liquid phase are required to be separated and enter a gas phase, the surfactant molecules are forced to float upwards by the rising of the bubbles by utilizing the larger density difference between the bubbles and water, the bubbles rise to the water surface for enrichment to form a foam layer, and the surfactant can be separated from the wastewater by removing the foam layer, so that the rapid foam separation is realized.
4) And (3) surfactant recovery: spraying the separated foam with an organic solvent, and standing until the organic solvent and the water phase are stably layered; pumping the layered organic solvent into a distiller, evaporating, condensing and recovering the organic solvent for recycling; the water phase obtained after layering is the reusable surfactant.
The surfactant recovered by the step can be continuously used for preparing washing powder, and the recovered organic solvent can be recycled, so that resources are saved.
5) And (3) Fenton treatment: feeding the wastewater subjected to foam separation in the step 3) into a Fenton reaction tank for reaction; after the reactant is treated by anaerobic and aerobic treatment, the waste water meeting the discharge standard is obtained by precipitation and filtration and can be used as cooling water.
The mixture after the Fenton reaction is firstly reacted by an anaerobic reactor, and then a proper amount of oxygen is introduced into the reactor to carry out aerobic reaction.
Further, adding a small amount of chemical flocculant into the wastewater of the regulating pond in the step 1). A small amount of chemical flocculant is added into the wastewater before air floatation treatment, so that small particles are enlarged, particles are easy to remove, and solid-liquid separation is more fully realized.
Further, COD in the wastewater treated in the step 2)Cr300-500 mg/L.
Further, the standing and layering time in the step 4) is 6-12 h.
Further, the surfactant in the step 4) is a nonionic surfactant and an anionic surfactant.
Further, the organic solvent in the step 4) is at least two of n-butanol, n-hexanol, tripropylamine and tributylamine, and the pH of the solvent is adjusted to be acidic.
Further, the volume ratio of the organic solvent used for spraying in the step 4) to the liquid in the foam is 0.5-1.2:1, so that the organic solvent can be saved to the maximum extent and the surfactant can be effectively recovered.
Further, the pH value of the Fenton reaction tank in the step 5) is adjusted to 3-5.
Further, the Fenton reaction time in the step 5) is 2-4h, the anaerobic treatment time is at least 6h, and the aerobic treatment time is at least 3 h.
Compared with the prior art, the invention has the following advantages:
1. the daily chemical recycling treatment process can recycle the surfactant in the wastewater, the content of organic matters in the treated wastewater is low, the national discharge requirement on industrial wastewater is met, and the recycled surfactant also meets the application requirement. The invention recovers the surfactant in the wastewater as a resource, not only reduces the discharge of harmful pollutants, but also realizes the recovery of useful resources, and is a sustainable sewage treatment technology.
2. The method has the advantages of simple process steps, convenient operation, low cost and no pollutant generation.
3. The invention combines the cooling water with the process, firstly uses the cooling water to flush the waste water, and finally recycles the waste water meeting the standard and can be used as the cooling water for recycling.
Detailed Description
All materials, reagents and equipment selected for use in the present invention are well known in the art, but do not limit the practice of the invention, and other reagents and equipment well known in the art may be suitable for use in the practice of the following embodiments of the invention.
Example 1
The daily chemical wastewater with COD of 5000mg/L is subjected to recovery treatment, and comprises the following steps:
1) collecting waste water: and (3) washing the production equipment by using cooling water, so that the daily chemical wastewater flows into the regulating tank through the sewage pipe after relatively large surface impurities are removed by the grille.
2) Air floatation treatment: and (3) sending the wastewater in the regulating tank into an air floatation tank by a lifting pump for physicochemical treatment, removing a part of COD and most of suspended matters, separating oil particles and micro particles in the solution, and finally realizing full solid-liquid separation. Through the steps, COD in the wastewaterCrIs 300 mg/L.
3) Foam separation: introducing pressurized air into the wastewater obtained in the step 2), forming a large number of micro bubbles in the water, enabling the surfactant in the wastewater to be adsorbed on the surface of gas, and separating the foam from the wastewater through a foam separation tower.
4) And (3) surfactant recovery: spraying the separated foam by using an organic solvent, standing for 6 hours, and stably layering the organic solvent and the water phase; pumping the layered organic solvent into a distiller, evaporating, condensing and recovering the organic solvent for recycling; the water phase obtained after layering is the reusable surfactant.
The surfactant in the washing powder is a nonionic surfactant and an anionic surfactant, the nonionic surfactant is fatty alcohol-polyoxyethylene ether and fatty acid methyl ester ethoxylate, the anionic surfactant is alkylbenzene sulfonic acid, the organic solvent is n-butyl alcohol, n-hexyl alcohol and tripropylamine, and the volume ratio of the organic solvent to the liquid in the foam is 0.5: 1 and the PH of the solvent was adjusted to 6. The surfactant recovered by the step can be continuously used for preparing washing powder, and the recovered organic solvent can be recycled, so that resources are saved.
5) And (3) Fenton treatment: feeding the wastewater subjected to foam separation in the step 3) into a Fenton reaction tank for reaction, wherein the PH value in the reaction tank is 3, and the Fenton reaction time is 2 hours;
the mixture after the Fenton reaction is firstly reacted for 6 hours by an anaerobic reactor, and then a proper amount of oxygen is introduced into the reactor to carry out aerobic reaction for 3 hours. After the reactants are treated by anaerobic and aerobic treatment, the wastewater meeting the discharge standard is obtained by precipitation and filtration, and the COD of the finally treated wastewater is 90mg/L and can be used as cooling water.
The data before and after the treatment of the daily chemical wastewater described in this example are as follows:
| contrast item | Before treatment | After treatment | Removal/recovery rate |
| Surface active agent | 560mg/L | 13mg/L | 97.68％ |
| COD | 5000mg/L | 90mg/L | 98.2％ |
| PH | 8.5 | 7.2 | / |
Example 2
The daily chemical wastewater with COD of 6900mg/L is subjected to recovery treatment, and comprises the following steps:
1) collecting waste water: and (3) washing the production equipment by using cooling water, so that the daily chemical wastewater flows into the regulating tank through the sewage pipe after relatively large surface impurities are removed by the grille.
2) Air floatation treatment: a small amount of chemical flocculant ferric chloride is added into the regulating tank, the wastewater in the regulating tank is sent into the air floatation tank by a lifting pump for physicochemical treatment, a part of COD and most of suspended matters are removed, oil particles and micro particles in the solution are separated, and finally, the solid-liquid full separation is realized. Through the steps, COD in the wastewaterCrThe concentration was 500 mg/L.
3) Foam separation: introducing pressurized air into the wastewater obtained in the step 2), forming a large number of micro bubbles in the water, enabling the surfactant in the wastewater to be adsorbed on the surface of gas, and separating the foam from the wastewater through a foam separation tower.
4) And (3) surfactant recovery: spraying the separated foam by using an organic solvent, standing for 12 hours, and stably layering the organic solvent and the water phase; pumping the layered organic solvent into a distiller, evaporating, condensing and recovering the organic solvent for recycling; the water phase obtained after layering is the reusable surfactant.
The surfactant in the washing powder is a nonionic surfactant and an anionic surfactant, the nonionic surfactant is branched-chain fatty alcohol-polyoxyethylene ether, the anionic surfactant is fatty alcohol-polyoxyethylene ether and sodium alkenyl sulfonate, the organic solvent is n-butyl alcohol, n-hexyl alcohol and tributylamine, and the volume ratio of the organic solvent to the liquid in the foam is 1.2:1 and the PH of the solvent was adjusted to 5. The surfactant recovered by the step can be continuously used for preparing washing powder, and the recovered organic solvent can be recycled, so that resources are saved.
5) And (3) Fenton treatment: feeding the wastewater subjected to foam separation in the step 3) into a Fenton reaction tank for reaction, wherein the PH value in the reaction tank is 5, and the Fenton reaction time is 4 hours;
the mixture after the Fenton reaction is firstly reacted for 8 hours by an anaerobic reactor, and then a proper amount of oxygen is introduced into the reactor to carry out aerobic reaction for 5 hours. After the reactants are treated by anaerobic and aerobic treatment, the wastewater meeting the discharge standard is obtained by precipitation and filtration, and the COD of the finally treated wastewater is 60mg/L and can be used as cooling water.
The data before and after the treatment of the daily chemical wastewater described in this example are as follows:
| contrast item | Before treatment | After treatment | Removal/recovery rate |
| Surface active agent | 488mg/L | 15mg/L | 96.93％ |
| COD | 6900mg/L | 60mg/L | 99.13％ |
| PH | 8.7 | 7.3 | / |
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (9)
1. The recycling treatment process of the daily chemical wastewater is characterized by comprising the following steps:
1) collecting waste water: washing the production equipment by using cooling water, and enabling the daily chemical wastewater to flow into a regulating tank through a sewage pipe after relatively large surface impurities are removed by a grating;
2) air floatation treatment: sending the wastewater in the regulating tank into an air floatation tank by a lifting pump for physicochemical treatment to remove a part of COD and most of suspended matters and realize full solid-liquid separation;
3) foam separation: introducing pressurized air into the wastewater obtained in the step 2), forming a large number of micro bubbles in the water, enabling the surfactant in the wastewater to be adsorbed on the surface of gas, and separating the foam from the wastewater through a foam separation tower;
4) and (3) surfactant recovery: spraying the separated foam with an organic solvent, and standing until the organic solvent and the water phase are stably layered; pumping the layered organic solvent into a distiller, evaporating, condensing and recovering the organic solvent for recycling; the water phase obtained after layering is the reusable surfactant;
5) and (3) Fenton treatment: feeding the wastewater subjected to foam separation in the step 3) into a Fenton reaction tank for reaction; after anaerobic and aerobic treatment, the reactant is precipitated and filtered to obtain the wastewater meeting the discharge standard.
2. The recycling treatment process of daily chemical wastewater according to claim 1, characterized in that a small amount of chemical flocculant is added into the wastewater of the adjusting tank in step 1).
3. The recycling process of daily chemical wastewater according to claim 1, wherein COD in the wastewater treated in step 2) is CODCr300-500 mg/L.
4. The recycling treatment process of daily chemical wastewater according to claim 2, wherein the standing and layering time in the step 4) is 6-12 h.
5. The recycling treatment process of daily chemical wastewater according to claim 1, wherein the surfactant in the step 4) is a nonionic surfactant and an anionic surfactant.
6. The recycling process of daily chemical wastewater as claimed in claim 5, wherein the organic solvent in step 4) is at least two of n-butanol, n-hexanol, tripropylamine and tributylamine, and the pH of the solvent is adjusted to be acidic.
7. The recycling treatment process of daily chemical wastewater according to claim 6, wherein the volume ratio of the organic solvent used for spraying in the step 4) to the liquid in the foam is 0.5-1.2: 1.
8. The recycling treatment process of daily chemical wastewater according to claim 1, wherein the pH of the Fenton reaction tank in the step 5) is adjusted to 3 to 5.
9. The recycling treatment process of daily chemical wastewater according to claim 1, wherein the Fenton reaction time in step 5) is 2-4h, the anaerobic treatment time is at least 6h, and the aerobic treatment time is at least 3 h.
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| CN202010658266.0A CN111995168A (en) | 2020-07-09 | 2020-07-09 | Recycling process of daily chemical wastewater |
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| CN202010658266.0A CN111995168A (en) | 2020-07-09 | 2020-07-09 | Recycling process of daily chemical wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113105049A (en) * | 2021-03-24 | 2021-07-13 | 广东丽臣奥威实业有限公司 | Treatment method of sewage containing high-foam surfactant |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105668916A (en) * | 2015-12-31 | 2016-06-15 | 安徽省绿巨人环境技术有限公司 | Daily chemical industry wastewater treatment method and apparatus thereof |
| CN107879531A (en) * | 2017-11-21 | 2018-04-06 | 四川理工学院 | The recovery process of surfactant in waste water |
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