Pesticide thiodicarb wastewater pretreatment system and method

A dimethedocarb, pretreatment technology, applied in water/sewage multi-stage treatment, degassed water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of poor biodegradability, large amount of waste residue and immature Effective industrialization treatment methods and other issues to achieve the effect of improving biodegradability and reducing load

Active Publication Date: 2020-08-18
HUNAN HAILI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 various toxic and harmful pollutants such as methomyl oxime, dimethylurea, pyridine, etc., and the B / C ratio is about 0.09. The wastewater has high pollutant concentration, high salt content, high chroma and high toxicity. It has strong toxicity to microorganisms and poor biodegradability. It is a high-concentration and refractory pesticide wastewater.
[0003] At present, the treatment method of thiodicarb wastewater in China is mainly incineration, which consumes a lot of energy, costs high, and produces a large amount of waste residue
Other reports that have not seen the operation of industrialized devices

Method used

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  • Pesticide thiodicarb wastewater pretreatment system and method
  • Pesticide thiodicarb wastewater pretreatment system and method
  • Pesticide thiodicarb wastewater pretreatment system and method

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Embodiment 1

[0036] Such as figure 1 and figure 2 As shown, the thiodimethomyl production wastewater pretreatment system of the present embodiment includes a heating stripping tower 1, a heating Fenton kettle 2 and a neutralization flocculation kettle 3 connected successively through pipelines, and the heating stripping tower 1 is used for Remove the pyridine in the pesticide thiodicarb wastewater to obtain the wastewater after removing the pyridine; the heating Fenton kettle 2 is used to remove the organic pollutants in the wastewater after removing the pyridine; the heating and stripping tower 1 includes a tower body 11 and Heater 12, the tower body 11 is provided with a hollow chamber 111, the hollow chamber 111 separates the tower body 11 into an upper tower body 112 and a lower tower body 113, the upper tower body 112 is provided with a water inlet 1121, and the lower tower body 113 is provided with an inlet The air port 1131; the hollow chamber 111 communicates with the upper tower...

Embodiment 2

[0063] A kind of thiodimethomyl production wastewater pretreatment system of embodiment 2 is used for the pretreatment method of thiodicarb production wastewater, and thiodicarb wastewater comes from a certain pesticide company in Jiangxi, comprising the following steps:

[0064] 1) Heating and stripping: the waste water from the waste water tank 5 is heated to 60°C by the waste water heater 52 and pressurized by the booster pump 51, and enters the upper tower body 112 from the water inlet 1121 at a flow rate of 4500 kg / h Inside, after the air is accelerated by the blower 15, the ventilation flow rate is 409.09m 3The speed of / h is blown into the lower tower body 113 from the air inlet 1131, and the volume ratio of the air to the heated dimethomyl production wastewater is 100:1. The thiodimethomyl wastewater enters the hollow chamber 111 after passing through the packing area 1122, and when the water level of the hollow chamber 111 exceeds the height of the overflow pipe 13, t...

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Abstract

The invention discloses a system and a method for pretreating LARVIN production wastewater. The system comprises a heating and air stripping tower (1), a heating Fenton kettle (2), and a neutralizingand flocculating kettle (3) which are sequentially connected by pipelines, wherein the heating and air stripping tower (1) is used for removing pyridine in LARVIN pesticide wastewater, so as to obtainthe pyridine-removed wastewater; the heating Fenton kettle (2) is used for removing the organic pollutants in the pyridine-removed wastewater. The method comprises the following steps of S1, heatingand air stripping; S2, Fenton oxidizing; S3, neutralizing and flocculating, so as to complete pretreatment. The system has the advantages that the removal rate of poisonous and harmful pollutants (pyridine and MHTA) and COD (chemical oxygen demand) is high, and the biochemical property of the wastewater is greatly improved. The method has the advantages that the investment is small, the running cost is low, the method is suitable for engineering popularization and application, and the like.

Description

technical field [0001] The invention belongs to the technical field of pesticide wastewater treatment, and in particular relates to a pretreatment system and method for pesticide thiodicarb wastewater. Background technique [0002] Thiodicarb (LARVIN) is a generation of high-efficiency, broad-spectrum, low-toxic, systemic carbamate insecticides, and is a low-toxic derivative 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 various toxic and harmful pollutants such as methomyl oxime, dimethylurea, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/30
CPCC02F1/02C02F1/20C02F1/52C02F1/66C02F1/72C02F9/00C02F2101/306C02F2305/026
Inventor 陈灿邱德跃张燕秦岳军马林干兴利刘欢
Owner HUNAN HAILI CHEM IND
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