Method for pretreating 2-methyl-4-chlorophenoxy acetic acid pesticide production wastewater

A production wastewater and pretreatment technology, which is applied in natural water body treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of complex recovery phase components, inability to meet industrial production, and high treatment costs , to achieve obvious environmental and economic benefits, to ensure stable and up-to-standard discharge, and to achieve high removal rates

Active Publication Date: 2011-08-24
中国中化股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For the treatment of phenolic wastewater containing 2,4 chlorine, the domestic patent CN 1403382A of the Chinese patent application introduces the treatment and resource recovery method of phenol containing wastewater in the production of 2,9,4 chlorine. The process is filtration-macroporous resin adsorption-biochemical, the method There are disadvantages of complex components of the recovered phase and high processing costs, which cannot meet the requirements of industrial production

Method used

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  • Method for pretreating 2-methyl-4-chlorophenoxy acetic acid pesticide production wastewater
  • Method for pretreating 2-methyl-4-chlorophenoxy acetic acid pesticide production wastewater
  • Method for pretreating 2-methyl-4-chlorophenoxy acetic acid pesticide production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take surfactant L-113A 30L, additive liquid paraffin 60L and film solvent aviation kerosene 910L to form a liquid film oil phase and add it to a high-shear emulsifier, control the number of revolutions to 2980 rpm, and add 15% sodium hydroxide solution at the same time 500L, high-speed shearing for 30 minutes to obtain a water-in-oil emulsion. Disperse 900L of the emulsion in 5400L of production wastewater, stir and extract at 130 rpm for 30 minutes, and let stand to separate layers. After the lower water phase is clarified, the two phases of oil and water are separated, and the water phase enters the biochemical treatment device for conventional treatment. The upper oil phase (extraction phase) enters the electrostatic demulsification device, the operating voltage is controlled to 23V, and the current is 8-10A. After 30 minutes of demulsification, the oil layer and the water layer are separated. The oil layer is reused to prepare the emulsion, and the water layer is re...

Embodiment 2

[0027] Take 20L of surfactant L-113A, 50L of additive liquid paraffin, and 930L of film solvent aviation kerosene to form a liquid film oil phase and add it to a high-shear emulsifier, control the number of revolutions to 3000 rpm, and add 20% sodium hydroxide solution at the same time 670L, make milk for 30 minutes, and the water-in-oil emulsion is obtained. Disperse 600L of the emulsion in 6000L of production wastewater, control the rotation speed at 130 rpm, stir and extract for 45 minutes, and let stand to separate layers. After the lower water phase is clarified, the oil and water phases are separated, the water phase enters the biochemical treatment device, and the upper oil phase (extraction phase) enters the electrostatic demulsification device. Operation is the same as in Example 1, and the obtained aqueous layer contains 26.2% sodium o-cresate.

Embodiment 3

[0029] Test the wastewater after the wastewater pretreatment method of the present invention, and see the table below for each index before and after treatment:

[0030] Table 1

[0031]

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Abstract

The invention belongs to the field of the treatment of pesticide production wastewater, and discloses a method for pretreating 2-methyl-4-chlorophenoxy acetic acid pesticide production wastewater. O-cresol is recovered from the wastewater by adopting a liquid membrane separation technology. The method comprises the following steps of: 1) emulsion preparation; 2) liquid membrane extraction; and 3) demulsification. Specifically, an oil phase containing a surfactant, an additive and a membrane solvent and aqueous solution of sodium hydroxide are prepared into emulsion under the condition of high-speed shearing; and the emulsion is dispersed into the 2-methyl-4-chlorophenoxy acetic acid pesticide production wastewater for the liquid membrane extraction, the o-cresol enters a liquid membrane phase, and o-cresol sodium salt is generated after electrostatic demulsification, and is recovered and applied to a 2-methyl-4-chlorophenoxy acetic acid production process. The removal rate of the o-cresol in the wastewater after the pretreatment is over 99 percent, the removal rate of chemical oxygen demand (COD) is over 90 percent, and the wastewater has biodegradability. The method can effectively solve the problem of steady standard discharge of the 2-methyl-4-chlorophenoxy acetic acid pesticide production wastewater, and has remarkable environmental benefit, economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the field of pesticide production wastewater treatment, and in particular relates to a pretreatment method for 2-methyl-4-chlor pesticide production wastewater. Background technique [0002] 2-methyl-4-chlor (chemical name: 2-methyl-4-chlorophenoxyacetic acid) is a post-emergence hormone-type selective herbicide. The production process is to use o-cresol and chloroacetic acid as raw materials to obtain 2-methyl-4-chlorine products through condensation and chlorination. High-concentration organic wastewater is produced during the production process, and the main pollutant is o-cresol, which is a toxic pollutant. [0003] For the treatment of phenolic wastewater containing 2,4 chlorine, the domestic patent CN 1403382A of the Chinese patent application introduces the treatment and resource recovery method of phenol containing wastewater in the production of 2,9,4 chlorine. The process is filtration-macroporous resin adsorption-bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C07C59/70C07C51/367A01N39/04A01P13/02C02F103/36
Inventor 程迪李鹏许淑娟马文静欧云川
Owner 中国中化股份有限公司
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