Method and device for removing phosphorous from glyphosate production wastewater

Abstract

The invention discloses a method and a device for removing phosphorous from glyphosate production wastewater, and belongs to the field of wastewater treatment. The method comprises the steps as follows: adjusting the pH value of the wastewater to be 2-3, adding a ferrous salt A for uniformly mixing, then adding hydrogen peroxide for performing catalytic oxidation reaction, after the catalytic oxidation reaction is ended, adding a calcium salt for performing one-stage sedimentation, separating to remove sediments, and adding a ferrous salt B for performing two-stage sedimentation. The device for realizing the method comprises an adjusting pond, a homogenizing pond, a catalytic oxidation pond, a first sedimentation pond and a second sedimentation pond, which are communicated through a pipeline with a pump in sequence. The method and the device are used for treating the glyphosate production wastewater, and have the characteristics of thoroughly removing the phosphorous, effectively utilizing a catalyst and the like.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method and device for removing phosphorus from glyphosate production wastewater. Background technique [0002] Glyphosate is a broad-spectrum herbicide, its scientific name is N-(phosphonomethyl) glycine, N-(phosphonomethyl) glycine, and it is an organophosphorus herbicide. According to the different production raw materials, the production methods of glyphosate mainly include two different production processes: iminodiacetic acid (IDA) method and glycine method. The IDA method mainly uses iminodiacetic acid as raw material. Glyphosate, the glycine method is also called the dialkyl phosphite method. The main raw materials for the production of glyphosate by the glycine method are ethylene glycol, caustic soda, deionized water, hydrochloric acid, formaldehyde, phosphorus trichloride, and 30% liquid caustic soda , heavy metal catalysts, hydrogen peroxide, sodium tungsta...

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Problems solved by technology

[0006] The core technology of the above methods is Fenton oxidation followed by precipitation and phosphorus removal, which can effectively remove organic phosphorus in glyphosate production wastewater, reduce the COD value of wastewater, and provide technical means for the treatment of glyphosate production wastewater , but the above method also has the following disadvantages: (1) in the Fenton catalytic oxidation process, ferrous salt and hydrogen peroxide are added simultaneously, which will cause local concentration to be too high and consume too much hydrogen peroxide. In practical industrial applications, it is not conducive to enterprises Cost control; (2) After the wastewater is catalyzed and oxidized, only one calcium salt precipitation and phosphorus removal is carried out, and the phosphorus removal of the wastewater is not thorough enough, and phosphorus still exists in the discharged wastewater

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