CN115583737A - Method for treating pesticide-containing wastewater - Google Patents
Method for treating pesticide-containing wastewater Download PDFInfo
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- CN115583737A CN115583737A CN202211028590.XA CN202211028590A CN115583737A CN 115583737 A CN115583737 A CN 115583737A CN 202211028590 A CN202211028590 A CN 202211028590A CN 115583737 A CN115583737 A CN 115583737A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000575 pesticide Substances 0.000 title claims abstract description 25
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 12
- YLPGTOIOYRQOHV-UHFFFAOYSA-N Pretilachlor Chemical compound CCCOCCN(C(=O)CCl)C1=C(CC)C=CC=C1CC YLPGTOIOYRQOHV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000005941 Thiamethoxam Substances 0.000 claims abstract description 11
- 230000020477 pH reduction Effects 0.000 claims abstract description 11
- NWWZPOKUUAIXIW-FLIBITNWSA-N thiamethoxam Chemical compound [O-][N+](=O)\N=C/1N(C)COCN\1CC1=CN=C(Cl)S1 NWWZPOKUUAIXIW-FLIBITNWSA-N 0.000 claims abstract description 11
- 230000007062 hydrolysis Effects 0.000 claims abstract description 8
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 8
- 230000015271 coagulation Effects 0.000 claims abstract description 7
- 238000005345 coagulation Methods 0.000 claims abstract description 7
- 239000010865 sewage Substances 0.000 claims abstract description 7
- 238000010992 reflux Methods 0.000 claims abstract description 5
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 239000008394 flocculating agent Substances 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 230000001988 toxicity Effects 0.000 abstract description 5
- 231100000419 toxicity Toxicity 0.000 abstract description 5
- 238000002306 biochemical method Methods 0.000 abstract description 2
- 229920002401 polyacrylamide Polymers 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010914 pesticide waste Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000005406 washing Methods 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/306—Pesticides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to a method for treating pesticide-containing wastewater, which adopts a combined process of coagulation, iron-carbon microelectrolysis, hydrolytic acidification and A/O contact oxidation to treat the pesticide-containing wastewater; PAC and PFS are added into a primary sewage coagulator, effluent enters an iron-carbon micro-electrolysis system for treatment, the effluent enters a hydrolysis acidification stage for hydrolysis, the hydrolysis acidification effluent enters an A/O contact oxidation stage, and the aim of completely treating wastewater is achieved by adjusting the reflux ratio. The technical scheme is used for treating the wastewater containing two pesticides, namely thiamethoxam and pretilachlor, so as to solve the problems of high concentration, strong toxicity and difficult treatment of the pesticide wastewater, and a biochemical method is adopted for treatment, so that the investment is low, the treatment cost is low, and the operation is simple.
Description
Technical Field
The invention belongs to the technical field of environment-friendly wastewater treatment, and particularly relates to a treatment method of pesticide-containing wastewater.
Background
The waste water from pesticide production is one of the waste water difficult to treat because of its complex components, high organic matter concentration, poor biodegradability and strong biological toxicity.
Can produce a large amount of waste water in the pesticide production process, bring huge pollution for the environment, pesticide waste water mainly includes: the waste water produced by synthesizing various pesticides and reactions in reproduction, the washing water produced during product purification and concentration, the cleaning waste water of production equipment and workshop ground, and the like, and has the characteristics of high concentration, strong toxicity, difficult treatment and the like. The waste water has poor biodegradability, a large amount of substances which are difficult to biodegrade exist, and the biochemical system is easy to be impacted, so that the biochemical treatment system is broken down. At present, the main methods for treating pesticide wastewater comprise a physical chemical method (electrolysis, reverse osmosis, extraction and ion exchange) and a chemical method (neutralization, chemical precipitation, oxidation and reduction) incineration method and the like.
Disclosure of Invention
The invention aims to provide a method for treating pesticide-containing wastewater, which aims to solve the problems of high concentration, strong toxicity and difficult treatment of the existing pesticide wastewater.
In order to achieve the purpose, the method is realized by the following technical scheme:
the technical scheme aims at the treatment method of the wastewater containing the thiamethoxam and the pretilachlor and does not aim at the treatment of other pesticide wastewater.
A method for treating pesticide-containing wastewater is wastewater containing thiamethoxam and pretilachlor, and comprises the following steps:
1) Enabling wastewater containing thiamethoxam and pretilachlor to enter a first-stage sewage coagulator, and adding PAM (polyacrylamide) and PFS (polyflocculation) flocculating agents into the first-stage sewage coagulator for coagulation;
2) The effluent from the first-stage sewage coagulator enters an iron-carbon micro-electrolysis reactor system through a lift pump for treatment;
3) The effluent treated by the iron-carbon micro-electrolysis reactor enters a hydrolysis acidification system;
4) The effluent water passing through the hydrolytic acidification system enters an anoxic/aerobic biochemical system for treatment;
5) And (4) discharging the effluent of the anoxic/aerobic biochemical system after the effluent is detected to reach the discharge standard or entering the next procedure.
Further, the water inlet indexes of the wastewater containing thiamethoxam and pretilachlor in the step 1) are as follows: the COD is 10000-15000mg/L, the BOD is 300-500mg/L, the ammonia nitrogen is 150-300mg/L, and the pH is 7-9.
Further, in the step 1), the dosage of independently adding PAM is 200mg/L-250mg/L, and the dosage of independently adding PFS is 250mg/L-300mg/L; the dosage of adding PAM and PFS is 250mg/L-300mg/L, and the mass ratio of PAM to PFS is 2:1-1:2.
further, the mass ratio of iron to carbon in the step 2) is 1:1, the reaction time is 40-80min, and the pH control range is 5-7.
Further, in the step 3), the pH value in the hydrolysis acidification pool is controlled within the range of 5.5-6.5, the temperature is controlled within the range of 20-30 ℃, and the retention time is 24-48h.
Further, in the step 4), the control range of the reflux ratio in the biochemical system is 200-250%, the dissolved oxygen in the anoxic tank is controlled to be less than 0.5mg/L, the dissolved oxygen in the aerobic tank is controlled to be 2-5 mg/L, and the retention time is controlled to be 48-72h.
Further, in the step 5), if the effluent cannot reach the discharge standard through detection, discharging the effluent into an unqualified storage tank, and adding the effluent into the iron-carbon micro-electrolysis reactor in the step 2) according to the proportion through the unqualified storage tank, wherein the adding proportion is 5-20% of the volume percentage of the wastewater.
The invention has the beneficial effects that:
the technical scheme is used for treating the wastewater containing the thiamethoxam and pretilachlor, solves the problems of high concentration, strong toxicity and difficult treatment of the pesticide wastewater, and adopts a biochemical method for treatment, so that the investment is low, the treatment cost is low, and the operation is simple.
Drawings
FIG. 1 is a flow chart of the wastewater treatment process of the present invention.
Detailed Description
The following embodiments are merely exemplary, which can be used to explain and illustrate the technical solutions of the present invention, and should not be interpreted as limiting the technical solutions of the present invention.
Example 1
The experimental results for treating the wastewater containing pesticide show that: the wastewater containing the thiamethoxam and the pretilachlor can be directly treated by a coagulation method under the condition of not adjusting the pH to be 7-11, and the initial indexes of raw water are that COD is 12000mg/L, BOD is 350mg/L, ammonia nitrogen is 210mg/L, total nitrogen is 261mg/L, and the pH is 9.PAM and PFS are the most suitable flocculating agents, the optimal dosage of PAM 200mg/L and the optimal dosage of PFS is 250mg/L, the COD removal rate of the wastewater is 62.2%, the wastewater enters an iron-carbon micro-electrolysis reactor, the reaction time is 50min, under the condition, the COD removal rate is 42%, the biodegradability of the wastewater is effectively improved after passing through the iron-carbon micro-electrolysis reactor, the retention time of the wastewater passing through a hydrolysis acidification tank is 24h, and the COD removal rate is 52%.
In the A/O contact oxidation process, the dissolved oxygen in an anoxic tank is controlled to be lower than 0.5mg/L, the dissolved oxygen in an aerobic tank is controlled to be about 2mg/L, the reflux ratio R =200%, the final effluent is COD (chemical oxygen demand) 51mg/L, ammonia nitrogen 0.5mg/L and total nitrogen 5mg/L, and the corresponding removal rates are respectively about 99.1%,99.1% and 95%.
Example 2
Experimental results of treating the wastewater containing pesticides show that the wastewater containing thiamethoxam and pretilachlor can be directly treated by a coagulation method under the condition of not adjusting the pH to be 7-11, the initial indexes of raw water are that COD is 11000mg/L, BOD is 350mg/L, ammonia nitrogen is 220mg/L, total nitrogen is 236mg/L, and the pH is 9.PAM and PFS are the most suitable flocculating agents, and the combination of PAM 150mg/L dosage and PFS 200mg/L dosage is used. The removal rate of the wastewater is 55.6 percent, the wastewater enters an iron-carbon micro-electrolysis reactor, the reaction time is 60min, the COD removal rate under the condition is 39 percent, the biodegradability of the wastewater is effectively improved after the wastewater passes through the iron-carbon micro-electrolysis reactor, the retention time of the wastewater passes through a hydrolytic acidification tank is 24h, and the COD removal rate is 50 percent.
In the A/O contact oxidation process, the dissolved oxygen in the A pool (anoxic pool) is controlled to be lower than 0.5mg/L, the dissolved oxygen in the O pool (aerobic pool) is controlled to be about 5mg/L, the reflux ratio R =200%, the COD of the final effluent is 62mg/L, the ammonia nitrogen is 0.5mg/L, the total nitrogen is 5mg/L, and the corresponding removal rates are respectively about 99.2%,99.1% and 95%.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A method for treating pesticide-containing wastewater is characterized in that the method is wastewater containing thiamethoxam and pretilachlor, and comprises the following steps:
1) Enabling the wastewater containing thiamethoxam and pretilachlor to enter a first-stage sewage coagulation device, and adding PAM and PFS flocculating agents into the first-stage sewage coagulation device for coagulation;
2) The effluent from the first-stage sewage coagulator enters an iron-carbon micro-electrolysis reactor system through a lift pump for treatment;
3) The effluent treated by the iron-carbon micro-electrolysis reactor enters a hydrolysis acidification system;
4) The effluent water passing through the hydrolytic acidification system enters an anoxic/aerobic biochemical system for treatment;
5) And (4) discharging the effluent of the anoxic/aerobic biochemical system after the effluent is detected to reach the discharge standard or entering the next procedure.
2. The method for treating pesticide-containing wastewater as claimed in claim 1, wherein the water inflow indexes of the wastewater containing thiamethoxam and pretilachlor in the step 1) are as follows: the COD is 10000-15000mg/L, the BOD is 300-500mg/L, the ammonia nitrogen is 150-300mg/L, and the pH is 7-9.
3. The method for treating pesticide-containing wastewater as set forth in claim 1, wherein in step 1), the amount of separately added PAM is 200mg/L to 250mg/L, and the amount of separately added PFS is 250mg/L to 300mg/L; the dosage of adding PAM and PFS is 250mg/L-300mg/L, and the mass ratio of PAM to PFS is 2:1-1:2.
4. the method for treating pesticide-containing wastewater according to claim 1, wherein the iron-carbon mass ratio in step 2) is 1:1, the reaction time is 40-80min, and the pH control range is 5-7.
5. The method for treating pesticide-containing wastewater as set forth in claim 1, wherein the pH in the hydrolysis acidification tank in step 3) is controlled within a range of 5.5-6.5, the temperature is controlled within a range of 20-30 ℃, and the retention time is 24-48h.
6. The method for treating pesticide-containing wastewater as claimed in claim 1, wherein the reflux ratio in the biochemical system in step 4) is controlled within a range of 200-250%, the dissolved oxygen in the anoxic tank is controlled to be less than 0.5mg/L, the dissolved oxygen in the aerobic tank is controlled within a range of 2-5 mg/L, and the retention time is controlled to be 48-72h.
7. The method for treating pesticide-containing wastewater as set forth in claim 1, wherein in step 5), if the effluent is not detected to meet the discharge standard, the effluent is discharged into a failed storage tank, and the effluent is proportionally added into the iron-carbon micro-electrolysis reactor in step 2) through the failed storage tank, wherein the addition proportion is 5-20% of the volume percentage of the wastewater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211028590.XA CN115583737A (en) | 2022-08-25 | 2022-08-25 | Method for treating pesticide-containing wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211028590.XA CN115583737A (en) | 2022-08-25 | 2022-08-25 | Method for treating pesticide-containing wastewater |
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| CN115583737A true CN115583737A (en) | 2023-01-10 |
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| CN202211028590.XA Pending CN115583737A (en) | 2022-08-25 | 2022-08-25 | Method for treating pesticide-containing wastewater |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103539314A (en) * | 2013-09-25 | 2014-01-29 | 安徽省绿巨人环境技术有限公司 | High-concentration degradation-resistant poisonous and harmful organic industrial wastewater treatment process and device |
| CN107352757A (en) * | 2017-09-05 | 2017-11-17 | 云南今业生态建设集团有限公司 | A kind of microelectrolysis processing technique of dyeing waste water |
| CN111875184A (en) * | 2020-08-10 | 2020-11-03 | 中国计量大学 | Propargite pesticide wastewater treatment process |
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2022
- 2022-08-25 CN CN202211028590.XA patent/CN115583737A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103539314A (en) * | 2013-09-25 | 2014-01-29 | 安徽省绿巨人环境技术有限公司 | High-concentration degradation-resistant poisonous and harmful organic industrial wastewater treatment process and device |
| CN107352757A (en) * | 2017-09-05 | 2017-11-17 | 云南今业生态建设集团有限公司 | A kind of microelectrolysis processing technique of dyeing waste water |
| CN111875184A (en) * | 2020-08-10 | 2020-11-03 | 中国计量大学 | Propargite pesticide wastewater treatment process |
Non-Patent Citations (1)
| Title |
|---|
| 徐融: "H/A/O接触氧化工艺处理农药废水的研究", 中国优秀硕士学位论文全文数据库工程科技Ⅰ辑, vol. 2015, no. 09, 15 September 2015 (2015-09-15), pages 7 - 8 * |
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