Resource recycling handling method of dimethoate pesticide wastewater

A technology for pesticide wastewater, recycling and treatment, which is applied in water/sewage treatment, chemical instruments and methods, special compound water treatment, etc. effect of regeneration

Inactive Publication Date: 2017-01-18
SUZHOU SUJING ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can remove the CODcr in the waste water, it does not recycle the dimethoate contained in the waste water

Method used

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  • Resource recycling handling method of dimethoate pesticide wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0044] Taking dimethoate wastewater from a pesticide production enterprise as an example, the basic properties of the wastewater are: dimethoate content ≤ 4%, COD cr : 32000~40000mg / L, pH 8~10, SS: 80~160mg / L, waste water generation 40m 3 / d.

[0045] Follow the steps below to treat the waste water:

[0046] (1) Adsorption: The dimethoate pesticide wastewater is subjected to adsorption treatment through an adsorption tower equipped with a macroporous adsorption resin (resin model is XDA) at a flow rate of 2 to 3 BV / h at an ambient temperature of 20 to 30 °C. Dimethoate is adsorbed on the macroporous adsorption resin. In this example, the adsorption device for wastewater treatment has 4 resin adsorption towers. During normal operation, 3 towers are connected in series for countercurrent adsorption, and the other tower is used for downstream desorption. The adsorption operation takes the previous three towers as the first tower, and the desorption tower as the tail tower to o...

Embodiment example 2

[0059] Taking dimethoate wastewater from a pesticide production enterprise as an example, the basic properties of the wastewater are: dimethoate content ≤ 4.5%, COD cr : 35000~42000mg / L, pH 8~9, SS: 102~171mg / L, waste water generation 60m 3 / d.

[0060] Follow the steps below to treat the waste water:

[0061] (1) Adsorption: The dimethoate pesticide wastewater is adsorbed at an ambient temperature of 20-30°C at a flow rate of 3-4BV / h through an adsorption tower equipped with a macroporous adsorption resin. Dimethoate is adsorbed on the macroporous adsorption on the resin. In this example, the adsorption device for wastewater treatment has 4 resin adsorption towers. During normal operation, 3 towers are connected in series for countercurrent adsorption, and the other tower is used for downstream desorption. In the adsorption operation, the first three towers are used as the first tower, and the desorption tower is used as the tail tower to operate in series.

[0062] (2) D...

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Abstract

The invention discloses a resource recycling handling method of dimethoate pesticide wastewater, and the method comprises the steps of (1) adsorbing dimethoate pesticide wastewater through an adsorber which is provided with a macro-porous resin to obtain wastewater effluent and the macro-porous resin adsorbed with the dimethoate; (2) conducting desorption and regeneration of the macro-porous resin adsorbed with the dimethoate through a desorption agent to obtain desorption liquid contained with the dimethoate, wherein the boiling point of the adopted desorption agent is lower than that of the dimethoate and can dissolve the dimethoate; (3) disposing the desorption liquid by adopting one or the combination of two of method a and method b, wherein method a is that by distilling the desorption liquid to separate the dimethoate and the desorption agent, desorption agent component and dimethoate component are obtained, then the dimethoate component is used for preparing dimethoate pesticide; method b is to use the desorption liquid in the step (2) as a desorption agent. The resource recycling handling method of dimethoate pesticide wastewater can not only adsorb the dimethoate from the dimethoate pesticide wastewater, but also recycle the dimethoate in the wastewater.

Description

technical field [0001] The invention relates to a resource recovery treatment method of dimethoate pesticide wastewater. Background technique [0002] The chemical name of dimethoate is O, O-dimethyl-S-(N-methylcarbamoylmethyl) phosphorodithioate, chemical formula C 5 h 12 NO 3 P.S. 2 , molecular weight 229.3. Dimethoate is a kind of acute toxicity, high residue, moderately toxic organophosphorus pesticide with systemic property, which belongs to phosphorodithioate, and is widely used in the control of diseases and insect pests of vegetables and fruits. Dimethoate can be oxidized into omethoate with higher activity in insects. Its mechanism of action is to inhibit acetylcholinesterase in insects, hinder nerve conduction and lead to death. Due to the long-term unscientific use of pesticides, there are pesticide residues in the soil, groundwater and atmospheric environment, which pose a serious threat to human health. Chinese invention patent CN101913733A discloses a pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F9/14C02F101/34C02F101/38
CPCC02F1/285C02F1/52C02F1/66C02F1/722C02F3/30C02F9/00C02F2101/306C02F2101/34C02F2101/38C02F2305/026
Inventor 李宇庆马楫宋小康余杰
Owner SUZHOU SUJING ENVIRONMENTAL ENG
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