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Pretreatment method for pesticide larvin wastewater

A dimethocarb and pretreatment technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of lack of mature and effective industrialized treatment methods and increase incineration costs , large amount of waste residues, etc., to achieve the effect of easy engineering popularization and application, significant treatment effect, and improved biodegradability

Inactive Publication Date: 2014-10-15
湖南海利常德农药化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mature and effective industrialized treatment method for the waste water generated in the production process of thiodicarb at home and abroad.
This wastewater contains methomyl oxime, dimethyl urea, pyridine sulfide, pyridine and other toxic and harmful pollutants. The B/C ratio is around 0.09. The wastewater has high pollutant concentration, high salt content and high chroma High toxicity, great toxicity to microorganisms, poor biodegradability, high concentration, refractor

Method used

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  • Pretreatment method for pesticide larvin wastewater
  • Pretreatment method for pesticide larvin wastewater
  • Pretreatment method for pesticide larvin wastewater

Examples

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Effect test

example 1

[0017] As shown in Figure 1, for a pesticide company in Hunan whose CODcr is 43864 mg / L and whose biodegradability B / C is 0.15, the thiodicarb wastewater was oxidized by chlorine gas, complexed extraction, electro-Fenton oxidation, flocculation and sedimentation. process steps for pretreatment.

[0018] The specific operation process is as follows:

[0019] 1) Chlorination and oxidation: Add 10 tons of thiodimethomyl wastewater to the chlorination kettle, pass 180 kg of chlorine gas to the chlorination kettle at room temperature until the pH value of the wastewater reaches 2, and react for 30 minutes after completion of the reaction, then press through a plate and frame filter press Filter, 9.6 tons of waste water after filtration is decomplexed and extracted, and 0.48 tons of slag is incinerated in an incinerator;

[0020] 2) Complex extraction: TBP and kerosene are formulated into a 100L complex extraction agent according to the volume ratio of 2:1, and mixed with 9.6 tons ...

example 2

[0026] As shown in Figure 1, the thiodicarb wastewater of a pesticide company in Jiangxi with a CODcr of 45680 mg / L and a biochemical B / C of 0.2 was treated with chlorine gas oxidation, complex extraction, electro-Fenton oxidation, and flocculation precipitation. process steps for pretreatment.

[0027] The specific operation process is as follows:

[0028] 1) Chlorination and oxidation: add 10 tons of thiodimethomyl wastewater to the chlorination kettle, pass chlorine gas to the chlorination kettle at room temperature until the pH value of the wastewater reaches 3, and react for 30 minutes after completion of the reaction, and then filter through a plate and frame filter press;

[0029] 2) Complex extraction: TBP and kerosene are formulated into a 100L complex extraction agent according to a volume ratio of 2:1, and mixed with 9.6 tons of chlorinated, oxidized and filtered waste water and added to a complex extraction tower with stirring. After stirring evenly, Let stand for...

example 3

[0035] As shown in Figure 1, the thiodicarb wastewater of a pesticide company in Jiangsu with a CODcr of 48372 mg / L and a biodegradable B / C of 0.17 was oxidized by chlorine gas, complexed extraction, electro-Fenton oxidation, and flocculated sedimentation. process steps for pretreatment.

[0036] The specific operation process is as follows:

[0037] 1) Chlorination and oxidation: add 10 tons of thiodimethomyl wastewater to the chlorination kettle, pass chlorine gas to the chlorination kettle at room temperature until the pH value of the wastewater reaches 4, react for 30 minutes after completion of the reaction, and then filter through a plate and frame filter press;

[0038] 2) Complex extraction: TBP and kerosene are formulated into a 100L complex extraction agent according to a volume ratio of 2:1, and mixed with 9.6 tons of chlorinated, oxidized and filtered waste water and added to a complex extraction tower with stirring. After stirring evenly, Let stand for 2 hours fo...

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Abstract

The invention discloses a pretreatment method for pesticide larvin wastewater. The pretreatment method comprises four process steps including chlorine oxidation, complexation extraction, Electro-Fenton oxidation and flocculent precipitation, wherein the larvin wastewater is subjected to complexation extraction after chlorine oxidation, a complexation extraction agent adopts a mixture of TBP (tri-butyl-phosphate) and kerosene, static layering is performed after uniform stirring, the complexation extraction agent at the upper layer can be regenerated for recycling, the lower layer is wastewater obtained after complexation extraction, H2O2 is added, the pH of the wastewater is adjusted, then the wastewater enters an Electro-Fenton oxidizer for Electro-Fenton oxidation, then a calcium hydroxide alkaline solution is used for adjusting the pH of the wastewater, and a flocculant PAM (polyacrylamide) is added for flocculent precipitation. According to the method, the pretreated pesticide larvin wastewater is light yellow and odorless, load for persistent organic pollutants in the wastewater is reduced greatly, biodegradability B/C is increased to 0.7 from 0.09, and the biodegradability of the waste water is improved. The method has remarkable treatment effect, requires small investment, is low in operation cost, and facilitates engineering popularization and application.

Description

technical field [0001] The invention relates to a pretreatment method for pesticide thiodicarb wastewater. Background technique [0002] Thiodicarb (LARVIN) is a generation of high-efficiency, broad-spectrum, low-toxic, systemic carbamate insecticides, and one of the low-toxic derivatives of methomyl. The drug is widely used in crops such as cotton, vegetables, fruit trees, tea, tobacco, forests, and wheat. It is especially effective in preventing and controlling the larvae of Lepidoptera, Homoptera, Hymenoptera, Diptera, Coleoptera and other pests. At present, it is an excellent agent for controlling resistant cotton bollworm. However, there is no mature and effective industrialized treatment method for the waste water produced in the production process of thiodicarb at home and abroad. This wastewater contains methomyl oxime, dimethyl urea, pyridine sulfide, pyridine and other toxic and harmful pollutants. The B / C ratio is around 0.09. The wastewater has high pollutant c...

Claims

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Application Information

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IPC IPC(8): C02F9/06
Inventor 陈灿秦岳军邱德跃张燕马林
Owner 湖南海利常德农药化工有限公司