CN116715395A - Acrylamide production wastewater purification process - Google Patents
Acrylamide production wastewater purification process Download PDFInfo
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- CN116715395A CN116715395A CN202310874892.7A CN202310874892A CN116715395A CN 116715395 A CN116715395 A CN 116715395A CN 202310874892 A CN202310874892 A CN 202310874892A CN 116715395 A CN116715395 A CN 116715395A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 133
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 238000000746 purification Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000004062 sedimentation Methods 0.000 claims abstract description 44
- 238000001556 precipitation Methods 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 21
- 238000005273 aeration Methods 0.000 claims abstract description 20
- 230000001112 coagulating effect Effects 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 18
- 239000011259 mixed solution Substances 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 22
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 21
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 21
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 15
- 239000002585 base Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000011265 semifinished product Substances 0.000 claims description 9
- 239000000701 coagulant Substances 0.000 claims description 5
- 125000002091 cationic group Chemical group 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 12
- 239000012535 impurity Substances 0.000 abstract description 12
- 238000004065 wastewater treatment Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 238000007599 discharging Methods 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 239000000084 colloidal system Substances 0.000 description 5
- 239000002957 persistent organic pollutant Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000008394 flocculating agent Substances 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000005909 Kieselgur Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- -1 papermaking Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
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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
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
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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
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The application relates to the technical field of wastewater, and particularly discloses an acrylamide production wastewater purification process. The acrylamide production wastewater purification process comprises the following specific steps: s1: sequentially carrying out acid-base neutralization adjustment and coagulating sedimentation on the acrylamide production wastewater; s2: anaerobic ammoniation treatment is carried out on the wastewater treated by the coagulating sedimentation device; s3: inputting the wastewater subjected to anaerobic ammoniation treatment into an A/O reaction system, and generating a muddy water mixed solution through nitrification and denitrification reaction; s4: and (3) carrying out multistage precipitation on the muddy water mixed solution generated in the step (S3) to generate mixed water, and carrying out aeration biological filtration treatment on the mixed water to generate pure water. According to the acrylamide production wastewater purification process, multistage precipitation and aeration biological filtration are combined, ammonia nitrogen in wastewater is removed, and the blockage of impurities and suspended matters in the wastewater to filter materials in an aeration biological filtration system is effectively reduced, so that the wastewater treatment efficiency and the effluent quality are improved.
Description
Technical Field
The application relates to the technical field of wastewater, in particular to a purification process of wastewater in the production of acrylamide.
Background
The polymer and derivative of acrylamide are widely applied to industries such as petroleum, medicine, papermaking, water treatment and the like, and the synthesis of the acrylamide is formed by the hydration reaction of acrylonitrile and water under the action of a microbial catalyst containing biological enzymes.
In the discharged wastewater of the industrial production of acrylamide, a large amount of organic matters, high-concentration ammonia nitrogen and bacterial contamination suspended matters are contained, if the suspended matters are not removed, the subsequent process is greatly influenced, and meanwhile, the ammonia nitrogen amount in the wastewater cannot be effectively removed by conventional water treatment, so that the emission standard is difficult to reach.
Disclosure of Invention
In order to improve the treatment effect of the wastewater from the production of the acrylamide and promote the wastewater from the production of the acrylamide to reach the discharge requirement, the application provides a purification process of the wastewater from the production of the acrylamide.
The application provides an acrylamide production wastewater purification process, which adopts the following technical scheme:
the acrylamide production wastewater purification process comprises the following specific steps:
s1: sequentially carrying out acid-base neutralization adjustment and coagulating sedimentation on the acrylamide production wastewater;
s2: anaerobic ammoniation treatment is carried out on the wastewater treated by the coagulating sedimentation device;
s3: inputting the wastewater subjected to anaerobic ammoniation treatment into an A/O reaction system, and generating a muddy water mixed solution through nitrification and denitrification reaction;
s4: and (3) carrying out multistage precipitation on the muddy water mixed solution generated in the step (S3) to generate mixed water, and carrying out aeration biological filtration treatment on the mixed water to generate pure water.
By adopting the technical scheme, the wastewater is subjected to acid-base neutralization adjustment and precipitation treatment, and most suspended substances in the wastewater are removed. And then carrying out anaerobic ammoniation treatment on the wastewater, oxidizing and ammoniating organic matters, decomposing organic pollutants in the water into small molecular intermediate products, and converting the organic nitrogen into ammonia nitrogen, so that the subsequent denitrification treatment is facilitated. And then the wastewater is further subjected to organic matter removal and ammonia nitrogen nitrification and denitrification reaction in an A/O reaction system, and finally the purposes of denitrification and COD reduction are realized. Finally, after the mud-water mixed solution is subjected to multistage precipitation treatment, the aeration biological treatment is used, so that impurities and ammonia nitrogen pollutants in the wastewater can be further removed, the quality of effluent water is improved, and the quality of the discharged water is ensured to meet the discharge requirement.
Preferably, in the step S1, the wastewater is subjected to coagulating sedimentation by using a coagulant, wherein the coagulant is a mixture of polymeric ferric sulfate and polymeric aluminum chloride.
By adopting the technical scheme, the polyaluminium chloride can gather suspended particles and colloid ions in the wastewater and coagulate to generate precipitate through the acting forces such as adsorption electric neutralization, adsorption bridging and the like, so that the effect of purifying treatment is achieved. The polymeric ferric sulfate can be hydrolyzed to generate polymeric ferric cations, and the polymeric ferric cations are bridged through hydroxyl groups to form polynuclear ions, so that colloid particles can be strongly adsorbed, and colloid Xu Ning is precipitated through adhesion, bridging and crosslinking, thereby realizing the effect of purifying wastewater.
Preferably, the step S1 is carried out acid-base neutralization to adjust the pH value to 6.5-8.
By adopting the technical scheme, the pH value of the wastewater is regulated to a reasonable range, so that the subsequent coagulation sedimentation treatment of the wastewater is facilitated, and the treatment efficiency and the effluent quality of the wastewater are improved. Wastewater having a pH below 6.5 may have a corrosive effect on wastewater treatment equipment, thereby affecting wastewater treatment. When the pH is higher than 8, the wastewater is over-alkaline, and the polyaluminum chloride in the coagulant can be easily deactivated, so that the subsequent treatment of the wastewater is affected, and finally, the effluent does not reach the standard.
Preferably, the usage amount of the polyaluminum chloride is 200-250mg/L, and the addition amount of the polymeric ferric sulfate is 150-200mg/L.
By adopting the technical scheme, the proper dosage of the polyaluminium chloride and the polymeric ferric sulfate is controlled, which is beneficial to improving the wastewater treatment efficiency. The usage amount of polyaluminum chloride and polyferric sulfate is too low, and flocculent colloid formed in the wastewater is not easy to settle and is easy to lose stability. When the amounts of polyaluminium chloride and polymeric ferric sulfate used are too large, the concentration of charged particles in the wastewater increases, and the particles repel each other, so that sedimentation is more difficult.
Preferably, the multistage precipitation in the step S4 is a secondary precipitation treatment, a mixing reaction treatment and a tertiary precipitation treatment, wherein the secondary precipitation treatment generates secondary mixed water, the secondary mixed water is subjected to the mixing reaction treatment to generate a semi-finished product of mixed water, and the semi-finished product of mixed water enters a tertiary precipitation treatment system to generate mixed water.
By adopting the technical scheme, the sludge-water mixed solution treated by the A/O reaction system is discharged out of the system after being subjected to secondary precipitation treatment, so that the blockage of sludge and sediment to subsequent wastewater treatment equipment is reduced, and the wastewater treatment effect is further improved. And then carrying out mixing reaction treatment on the secondary mixed water generated by the secondary precipitation treatment, removing organic matters and pollutants in the secondary mixed water, further purifying the wastewater, and improving the quality of effluent. And finally, the mixed water semi-finished product is treated by a three-stage sedimentation tank, so that sediment in the wastewater can be further removed, aeration biological filtration treatment is better performed, the blockage of impurities in the wastewater to an aeration biological filtration membrane is reduced, and the water outlet quality and the wastewater treatment efficiency are improved.
Preferably, diatomite, carbon powder and flocculant are added in the mixed reaction treatment.
Through adopting above-mentioned technical scheme, utilize the adsorption of diatomaceous earth, powdered carbon and flocculating agent, can become the colloid suspended particle grow in the waste water, form the flocculation thing of being convenient for deposit, further clear away suspended solid and organic matter impurity in the waste water, reduce COD in the waste water, further improve the effluent quality.
Preferably, diatomite and carbon powder are added in the three-stage precipitation treatment.
By adopting the technical scheme, diatomite and carbon powder are used in three-stage precipitation treatment, organic pollutants and COD which are difficult to degrade in the wastewater are continuously adsorbed, diatomite, carbon powder and impurities in the wastewater are used in mixed reaction treatment to precipitate together, fine particles are precipitated and become larger, and the fine particles are discharged through a system, so that the blockage of the impurities in the wastewater to a subsequent aeration biological filter material is reduced, the subsequent purification process is influenced, and the wastewater treatment efficiency and the effluent quality are improved.
Preferably, the flocculant is cationic polyacrylamide.
Through adopting above-mentioned technical scheme, cationic polyacrylamide can adsorb a plurality of suspended particles that have negative charge on the molecular chain through electrostatic action for dispersed and less suspended particles are together coagulated, thereby play solid-liquid separation effect, get rid of suspended matter from waste water, improve the play water quality.
In summary, the application has the following beneficial effects:
1. according to the application, the wastewater is subjected to acid-base neutralization adjustment and coagulating sedimentation in sequence to pretreat the wastewater from the production of acrylamide, so that most of organic matters and suspended matters are removed. And then the wastewater is treated by an anaerobic ammoniation system and an A/O reaction system in sequence, so that the purposes of removing organic pollutants and denitrifying are realized. Finally, the muddy water mixed solution is combined with the aeration biological filtration through multistage precipitation, ammonia nitrogen in the wastewater is thoroughly removed, and meanwhile, the multistage precipitation treatment of the wastewater can effectively reduce the blockage of impurities and suspended matters in the wastewater to a filter membrane in the aeration biological filtration system, so that the wastewater treatment efficiency and the effluent quality are improved, and the effluent quality is ensured to reach the standard.
2. In the application, the secondary precipitation treatment is preferably adopted to precipitate the muddy water mixed solution generated by the A/O reaction system, the sludge is discharged, then diatomite, carbon powder and flocculant are used for further flocculating and precipitating the mixed water subjected to the secondary precipitation treatment, so that the COD content and suspended matter impurities in the wastewater are further reduced, and the quality of the effluent is improved. The three-stage precipitation treatment enlarges the flocculation particles, effectively precipitates and eliminates impurities in the wastewater together with diatomite and carbon powder, thereby further reducing the impurity content in the mixed water entering the aeration biological filtration system, being beneficial to the removal of ammonia nitrogen pollutants in the wastewater by the aeration biological filtration system, and further improving the quality of effluent and the purification effect of the wastewater.
Detailed Description
The present application will be described in further detail with reference to examples.
The grain diameter of the carbon powder is 0.05mm.
Examples
Example 1
The acrylamide production wastewater purification process comprises the following specific steps:
s1: and (3) carrying out acid-base neutralization adjustment on the acrylamide production wastewater by using sodium hydroxide and sulfuric acid, adjusting the pH value of the wastewater to 7, inputting the wastewater subjected to the acid-base neutralization adjustment into a coagulating sedimentation device, adding polymeric ferric sulfate and polymeric aluminum chloride into the coagulating sedimentation device, wherein the adding amount of the polymeric ferric sulfate is 180mg/L, the adding amount of the polymeric aluminum chloride is 220mg/L, and the HRT is 1.4h, generating pretreated wastewater and sludge, and then discharging the sludge.
S2: and (3) conveying the pretreated wastewater generated in the step (S1) to a UASB reactor for anaerobic ammoniation treatment, wherein the HRT is 33.75h, and generating a primary wastewater mixture.
S3: conveying the primary wastewater mixture generated in the step S2 to an A pool and an O pool in an A/O reaction system, wherein the operation conditions of the A pool are as follows: DO value 1mg/L, HRT 4.5h, and O pool operating conditions were: DO value is 3mg/L, HRT is 19h, and mud-water mixed solution is generated.
S4: carrying out secondary sedimentation treatment on the muddy water mixed solution through a secondary sedimentation tank, wherein the HRT is 6.5 hours, generating secondary mixed water and sludge, and discharging the sludge out of the system; then conveying the secondary mixed water to a mixing reactor for mixing reaction treatment, adding diatomite, carbon powder and flocculant into the mixing reactor, wherein the mass ratio of the diatomite to the carbon powder to the flocculant is 1:1:1.5, the sum of the adding amounts of the diatomite, the carbon powder and the flocculant is 250mg/L, the flocculant is cationic polyacrylamide, and the HRT is 1h, so as to generate a mixed water semi-finished product; delivering the mixed water semi-finished product to a three-stage sedimentation tank for sedimentation, and adding diatomite and carbon powder into the three-stage sedimentation tank, wherein the mass ratio of the diatomite to the carbon powder is 1:1, the sum of the adding amount of diatomite and carbon powder is 150mg/L, and the HRT is 1.3 hours, so that mixed water and sludge are generated, and the sludge is discharged out of the system.
S5: will beDelivering the mixed water to a BAF reactor for aeration biological filtration treatment, wherein the HRT is 1.5h, and the air supply amount is 0.25m 3 And (h) generating pure water.
Example 2
Example 2 differs from example 1 in that the pH value was adjusted to 6.5 by neutralization of the acid and alkali of the wastewater in the purification process of the wastewater from the production of acrylamide, the addition amount of polyaluminum chloride was 200mg/L, and the addition amount of polymeric ferric sulfate was 200mg/L.
Example 3
Example 3 differs from example 1 in that the pH value was adjusted to 8 by neutralization of the acid and alkali of the wastewater in the purification process of the wastewater from the production of acrylamide, the addition amount of polyaluminum chloride was 250mg/L, and the addition amount of polymeric ferric sulfate was 150mg/L.
Example 4
Example 4 differs from example 1 in that the pH value was adjusted to 9 by neutralization of the acid and alkali of the wastewater in the purification process of the wastewater from the production of acrylamide.
Example 5
Example 5 differs from example 1 in that the amount of aluminum chloride added in the purification process of acrylamide production wastewater was 300mg/L.
Example 6
Example 6 is different from example 1 in that the multi-stage precipitation is a secondary precipitation treatment and a tertiary precipitation treatment in the purification process of wastewater from acrylamide production.
The acrylamide production wastewater purification process comprises the following specific steps:
s1: and (3) carrying out acid-base neutralization adjustment on the acrylamide production wastewater by using sodium hydroxide and sulfuric acid, adjusting the pH value of the wastewater to 7, inputting the wastewater subjected to the acid-base neutralization adjustment into a coagulating sedimentation device, adding polymeric ferric sulfate and polymeric aluminum chloride into the coagulating sedimentation device, wherein the adding amount of the polymeric ferric sulfate is 180mg/L, the adding amount of the polymeric aluminum chloride is 220mg/L, and the HRT is 1.4h, generating pretreated wastewater and sludge, and then discharging the sludge.
S2: and (3) conveying the pretreated wastewater generated in the step (S1) to a UASB reactor for anaerobic ammoniation treatment, wherein the HRT is 33.75h, and generating a primary wastewater mixture.
S3: conveying the primary wastewater mixture generated in the step S2 to an A pool and an O pool in an A/O reaction system, wherein the operation conditions of the A pool are as follows: DO value 1mg/L, HRT 4.5h, and O pool operating conditions were: DO value is 3mg/L, HRT is 19h, and mud-water mixed solution is generated.
S4: carrying out secondary sedimentation treatment on the muddy water mixed solution through a secondary sedimentation tank, wherein the HRT is 6.5 hours, generating secondary mixed water and sludge, and discharging the sludge out of the system; delivering the secondary mixed water to a tertiary sedimentation tank for sedimentation, and adding diatomite and carbon powder into the tertiary sedimentation tank, wherein the mass ratio of the diatomite to the carbon powder is 1:1, the sum of the adding amount of diatomite and carbon powder is 150mg/L, and the HRT is 1.3 hours, so that mixed water and sludge are generated, and the sludge is discharged out of the system.
S5: delivering the mixed water to a BAF reactor for aeration biological filtration treatment, wherein the HRT is 1.5h, and the air supply amount is 0.25m 3 And (h) generating pure water.
Example 7
Example 7 differs from example 1 in that diatomaceous earth and carbon powder are not used in the mixed reaction treatment of the purification process of wastewater from acrylamide production.
The acrylamide production wastewater purification process comprises the following specific steps:
s1: and (3) carrying out acid-base neutralization adjustment on the acrylamide production wastewater by using sodium hydroxide and sulfuric acid, adjusting the pH value of the wastewater to 7, inputting the wastewater subjected to the acid-base neutralization adjustment into a coagulating sedimentation device, adding polymeric ferric sulfate and polymeric aluminum chloride into the coagulating sedimentation device, wherein the adding amount of the polymeric ferric sulfate is 180mg/L, the adding amount of the polymeric aluminum chloride is 220mg/L, and the HRT is 1.4h, generating pretreated wastewater and sludge, and then discharging the sludge.
S2: and (3) conveying the pretreated wastewater generated in the step (S1) to a UASB reactor for anaerobic ammoniation treatment, wherein the HRT is 33.75h, and generating a primary wastewater mixture.
S3: conveying the primary wastewater mixture generated in the step S2 to an A pool and an O pool in an A/O reaction system, wherein the operation conditions of the A pool are as follows: DO value 1mg/L, HRT 4.5h, and O pool operating conditions were: DO value is 3mg/L, HRT is 19h, and mud-water mixed solution is generated.
S4: carrying out secondary sedimentation treatment on the muddy water mixed solution through a secondary sedimentation tank, wherein the HRT is 6.5 hours, generating secondary mixed water and sludge, and discharging the sludge out of the system; then conveying the secondary mixed water to a mixing reactor for mixing reaction treatment, adding a flocculating agent into the mixing reactor, wherein the adding amount of the flocculating agent is 250mg/L, the HRT is 1h, generating a mixed water semi-finished product, conveying the mixed water semi-finished product to a three-stage sedimentation tank for sedimentation, and adding diatomite and carbon powder into the three-stage sedimentation tank, wherein the mass ratio of the diatomite to the carbon powder is 1:1, the sum of the adding amount of diatomite and carbon powder is 150mg/L, and the HRT is 1.3 hours, so that mixed water and sludge are generated, and the sludge is discharged out of the system.
S5: delivering the mixed water to a BAF reactor for aeration biological filtration treatment, wherein the HRT is 1.5h, and the air supply amount is 0.25m 3 And (h) generating pure water.
Comparative example
Comparative example 1
Comparative example 1 differs from example 1 in that the aerated biological filtration treatment was not used in the purification process of acrylamide production wastewater.
Comparative example 2
Comparative example 2 is different from example 1 in that a multistage precipitation treatment is not used in the purification process of wastewater from acrylamide production, and only a single precipitation treatment is used.
The acrylamide production wastewater purification process comprises the following specific steps:
s1: and (3) carrying out acid-base neutralization adjustment on the acrylamide production wastewater by using sodium hydroxide and sulfuric acid, adjusting the pH value of the wastewater to 7, inputting the wastewater subjected to the acid-base neutralization adjustment into a coagulating sedimentation device, adding polymeric ferric sulfate and polymeric aluminum chloride into the coagulating sedimentation device, wherein the adding amount of the polymeric ferric sulfate is 180mg/L, the adding amount of the polymeric aluminum chloride is 220mg/L, and the HRT is 1.4h, generating pretreated wastewater and sludge, and then discharging the sludge.
S2: and (3) conveying the pretreated wastewater generated in the step (S1) to a UASB reactor for anaerobic ammoniation treatment, wherein the HRT is 33.75h, and generating a primary wastewater mixture.
S3: conveying the primary wastewater mixture generated in the step S2 to an A pool and an O pool in an A/O reaction system, wherein the operation conditions of the A pool are as follows: DO value 1mg/L, HRT 4.5h, and O pool operating conditions were: DO value is 3mg/L, HRT is 19h, and mud-water mixed solution is generated.
S4: and (3) carrying out secondary sedimentation treatment on the muddy water mixed solution through a secondary sedimentation tank, wherein the HRT is 6.5 hours, and generating secondary mixed water and sludge, and discharging the sludge out of the system.
S5: delivering the secondary mixed water to a BAF reactor for aeration biological filtration treatment, wherein the HRT is 1.5h, and the air supply amount is 0.25m 3 And (h) generating pure water.
Performance test
The effluent quality treated by the purification process of the wastewater from the production of acrylamide according to examples 1-7 and comparative examples 1-2 of the present application was tested as follows, and the specific test results are shown in Table 1.
Detection method
1. Water quality detection
The COD content in the wastewater is measured by adopting a rapid digestion method, and rho (NH) in the wastewater is measured by adopting a spectrophotometry method 3 N) the suspended matter content in the wastewater is determined by using GB/T1190l-89 determination of suspended matter in water.
Acrylamide production wastewater quality
Table 1: effluent quality detection
As can be seen from the water quality detection results, the effluent quality of the acrylamide production wastewater purification process prepared by the embodiments 1-3 of the application reaches the national emission standard, wherein the COD removal rate reaches 99.2%, the suspended matter removal rate reaches 99.9%, the ammonia nitrogen pollutant removal rate reaches 97.5%, and the ammonia nitrogen content in the final pure water quality is far lower than the national emission standard, so that the application further shows that the mutual combination of the processes of the application effectively removes the organic pollutants and the ammonia nitrogen pollutants in the acrylamide wastewater and improves the effluent quality.
As can be seen from comparison of the effluent quality detection in the embodiment 4 with the embodiment 1, the pH value in the neutralization adjustment of the wastewater in the embodiment 4 is adjusted to 9, and the effluent quality still reaches the national standard, but under the condition of over-alkali, the use efficiency of the polyaluminum chloride and the polymeric ferric sulfate in the coagulating sedimentation of the wastewater is reduced, the polyaluminum chloride and the polymeric ferric sulfate are easy to deactivate, the use amount of the polyaluminum chloride and the polymeric ferric sulfate is required to be increased on the premise of keeping the same effluent quality, and meanwhile, the effective treatment time of the polyaluminum chloride and the polymeric ferric sulfate to the water is correspondingly shortened. Therefore, the pH value of the wastewater is more suitable to be adjusted to be 6.5-8 in acid-base neutralization adjustment.
As is clear from the comparison between the effluent quality tests of the coagulating sedimentation system of example 5 and example 1, the amount of the polyaluminum oxide used in example 5 is larger, the COD content and suspended matter content of the wastewater rise after the coagulating sedimentation system is treated, and further, it is explained that the excessive use of polyaluminum chloride and polyferric sulfate may cause mutual repulsion between the flocculated particles, and sedimentation is difficult. Therefore, the choice and amount of polyaluminum chloride used is also critical to the quality of the effluent.
Compared with the detection of the quality of the effluent of the three-stage precipitation system in the embodiment 6 and the embodiment 1, the embodiment 6 does not use mixed reaction treatment, the content of organic matters and impurities in the wastewater can be increased, further indicates that the mixed reaction treatment can further flocculate the wastewater after the secondary precipitation treatment, further remove the impurities and organic pollutants in the wastewater, and finally improve the wastewater treatment effect and the effluent quality through the three-stage precipitation treatment.
Compared with the quality detection of the effluent of the three-stage precipitation system in the embodiment 7, the quality detection of the effluent of the three-stage precipitation system in the embodiment 1 shows that the diatomite, the carbon powder and the flocculant are matched in the mixed precipitation system, so that the flocculated aggregates in the wastewater can be precipitated, the flocculation precipitation efficiency is improved, and the quality of the effluent is further improved.
As is clear from comparison of the results of the quality detection of the effluent of comparative example 1 and example 1, the comparative example 1 does not use aeration biological filtration treatment, and organic matters and suspended matters in the wastewater are effectively removed, but the discharged effluent still contains a certain amount of ammonia nitrogen pollutants, so that a certain pollution is generated to the environment, and therefore, the filtering treatment of the wastewater produced by acrylamide production by using aeration biological treatment is critical to the quality of the effluent.
As can be seen from comparison of the results of the quality detection of the effluent of comparative example 2 and example 1, in comparative example 2, the single use of the secondary sedimentation tank for the precipitation treatment of the water treated by the A/O reaction system greatly reduces the quality of the effluent, and at the same time, the solid suspended matters in the wastewater treated by the secondary sedimentation treatment can also cause blockage of the subsequent aeration biological filter membrane, thereby affecting the wastewater treatment effect, so that the multistage sedimentation treatment is important for purifying the wastewater produced by the acrylamide production.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (8)
1. The acrylamide production wastewater purification process is characterized by comprising the following specific steps of:
s1: sequentially carrying out acid-base neutralization adjustment and coagulating sedimentation on the acrylamide production wastewater;
s2: anaerobic ammoniation treatment is carried out on the wastewater treated by the coagulating sedimentation device;
s3: inputting the wastewater subjected to anaerobic ammoniation treatment into an A/O reaction system, and generating a muddy water mixed solution through nitrification and denitrification reaction;
s4: and (3) carrying out multistage precipitation on the muddy water mixed solution generated in the step (S3) to generate mixed water, and carrying out aeration biological filtration treatment on the mixed water to generate pure water.
2. The process for purifying wastewater from acrylamide production according to claim 1, characterized in that: in the step S1, coagulating sedimentation is carried out on the wastewater by using a coagulant, wherein the coagulant is a mixture of polymeric ferric sulfate and polymeric aluminum chloride.
3. The process for purifying wastewater from acrylamide production according to claim 2, characterized in that: and step S1, acid-base neutralization is carried out, and the pH value is regulated to 6.5-8.
4. The process for purifying wastewater from acrylamide production according to claim 2, characterized in that: the usage amount of the polyaluminum chloride is 200-250mg/L, and the addition amount of the polymeric ferric sulfate is 150-200mg/L.
5. The process for purifying wastewater from acrylamide production according to claim 1, characterized in that: the multi-stage precipitation in the step S4 is a secondary precipitation treatment, a mixing reaction treatment and a tertiary precipitation treatment, the secondary precipitation treatment generates secondary mixed water, the secondary mixed water is subjected to the mixing reaction treatment to generate a mixed water semi-finished product, and the mixed water semi-finished product enters a tertiary precipitation treatment system to generate mixed water.
6. The process for purifying wastewater from acrylamide production according to claim 5, characterized in that: diatomite, carbon powder and flocculant are added in the mixed reaction treatment.
7. The process for purifying wastewater from acrylamide production according to claim 5, characterized in that: diatomite and carbon powder are added in the three-stage precipitation treatment.
8. The process for purifying wastewater from acrylamide production according to claim 6, characterized in that: the flocculant is cationic polyacrylamide.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117430291A (en) * | 2023-12-12 | 2024-01-23 | 南通博亿化工有限公司 | Impurity removal and purification process for acrylamide wastewater |
| CN117658395A (en) * | 2024-02-02 | 2024-03-08 | 克拉玛依市三达新技术股份有限公司 | Treatment method of wastewater containing hydrogen sulfide |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117430291A (en) * | 2023-12-12 | 2024-01-23 | 南通博亿化工有限公司 | Impurity removal and purification process for acrylamide wastewater |
| CN117430291B (en) * | 2023-12-12 | 2024-04-30 | 南通博亿化工有限公司 | Impurity removal and purification process for acrylamide wastewater |
| CN117658395A (en) * | 2024-02-02 | 2024-03-08 | 克拉玛依市三达新技术股份有限公司 | Treatment method of wastewater containing hydrogen sulfide |
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