2,4-D pesticide production waste water pretreatment method

A kind of waste water production, 4-D technology, applied in 2 fields, can solve the problems of high COD value of waste water, high water solubility of extractant, complex recovery phase components, etc., achieve high removal rate, obvious environmental and economic benefits, save The effect of alkali removal operation and materials

Active Publication Date: 2011-09-07
中国中化股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery phase components of this method are complex, difficult to use, the removal rate of total phenol is low, and the treatment cost is high
③Solvent extraction, usually using ethyl acetate as the extraction agent, because the extraction agent is highly water-soluble, so the COD value of the treated wastewater increases

Method used

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  • 2,4-D pesticide production waste water pretreatment method
  • 2,4-D pesticide production waste water pretreatment method
  • 2,4-D pesticide production waste water pretreatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 30L of surfactant L-113A, 60L of additive liquid paraffin, and 910L of film solvent aviation kerosene to form an oil phase, put it into a milk maker, add 500L of 15% sodium hydroxide solution at the same time, and high shear at 3000 rpm Cut and emulsify for 30 minutes to obtain a milky white water-in-oil emulsion.

[0025] Disperse 1000L of the above-mentioned emulsion in 6000L of waste water to be treated, stir and extract for 30 minutes at a speed of 130 rpm, 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 for conventional treatment, and the upper oil phase (extraction phase) enters the electrostatic demulsification device.

[0026] Control the operating voltage of the electrostatic demulsification device to 23V, current 8-10A, after 30 minutes of demulsification time, separate the oil phase and water phase, the oil phase is reused to make t...

Embodiment 2

[0028] Take 20L of surfactant L-113A, 50L of additive liquid paraffin, and 930L of film solvent kerosene to form an oil phase, put it into a milk maker, add 500L of 20% sodium hydroxide solution at the same time, and high shear at 3000 rpm Cut and emulsify for 30 minutes to obtain a milky white water-in-oil emulsion.

[0029] Disperse 750L of the prepared emulsion in 6000L of waste water to be treated, stir and extract for 60 minutes at a speed of 130 rpm, 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 for conventional treatment, and the upper oil phase (extraction phase) enters the electrostatic demulsification device.

[0030] The operation of electrostatic demulsification separation is the same as in Example 1, and the obtained water phase contains 24.3% sodium 2,4-dichlorophenate and 0.7% sodium 2,4-D, which is reused in the condensation section.

Embodiment 3

[0032] The waste water after being treated by the waste water pretreatment method of the present invention is analyzed, and each index before and after treatment is shown in the following table:

[0033] Table 1

[0034]

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Abstract

The invention belongs to the field of pesticide production waste water treatment and discloses a 2,4-D pesticide production waste water pretreatment method. 2,4-dichlorophenol and 2,4-D are recovered from the waste water by a liquid membrane separation technique, so harmful pollutants are removed and reclamation is realized at the same time. The 2,4-D pesticide production waste water pretreatment method mainly comprises the following steps of: 1) preparing emulsion; 2) performing liquid membrane extraction; and 3) breaking the emulsion. The 2,4-D pesticide production waste water pretreatment method particularly comprises the following steps of: preparing the emulsion by cutting an oil phase comprising a surfactant, an additive and a membrane solvent and aqueous solution of sodium hydroxide at a high speed; dispersing the emulsion to 2,4-D pesticide waste water to perform extraction; allowing the 2,4-dichlorophenol and the 2,4-D to enter a liquid membrane phase; breaking the emulsion electrostatically to generate 2,4-dichlorophenol sodium salt and 2,4-D sodium salt; and applying to a condensation section of the product, wherein after the pretreatment, the removing rate of phenol and the 2,4-D in the waste water is over 99 percent, COD removing rate is over 57 percent and biochemical property is achieved. By the method, the 2,4-D pesticide production waste water can be discharged stably and standardly; and remarkable environmental, economic and social benefits are achieved.

Description

technical field [0001] The invention belongs to the field of pesticide production wastewater treatment, and in particular relates to a 2,4-D pesticide production wastewater pretreatment method. Background technique [0002] 2,4-D (chemical name: 2,4-dichlorophenoxyacetic acid) is a selective and highly effective herbicide. Wastewater containing toxic pollutants such as 2,4-dichlorophenol and 2,4-D is produced during the production process. The pollution and treatment of this wastewater is one of the problems restricting the development of the industry. [0003] Existing treatment technologies for 2,4-D pesticide production wastewater: ①Fenton oxidation is an advanced oxidation technology combining ferrous salt and hydrogen peroxide. This technology consumes a large amount of oxidant, so the treatment cost is high, 600-700 yuan per ton of wastewater treatment, and useful resources cannot be recovered. ② Resin adsorption is a method of reducing pollutants in wastewater thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/70C07C51/42C07C39/30C07C37/70C02F9/04
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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