Dephosphorization method for glyphosate wastewater

A treatment method, glyphosate technology, applied in natural water treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., can solve the problem of phosphorus removal in wastewater that is rarely involved

Active Publication Date: 2011-09-07
GUANGXI RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at the treatment of glyphosate production wastewater, at present, there have been many domestic researches published in various literatures, but most of the researches focus on how to degrade the COD of wastewater, while the phosphorus removal problem of this type of wastewater is rarely discussed. involved

Method used

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  • Dephosphorization method for glyphosate wastewater
  • Dephosphorization method for glyphosate wastewater

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Embodiment 1

[0016] The glyphosate wastewater from a technology company in Guangxi was used as the water to be treated, and the phosphorus removal treatment was carried out by alkaline hydrolysis and precipitation reaction, Fenton oxidation reaction and catalytic reprecipitation process.

[0017] The specific process steps are as follows:

[0018] 1) Alkali hydrolysis and precipitation reaction: After the comprehensive wastewater is measured, put it into the alkali hydrolysis reaction kettle, adjust the pH to 7.0-8.0 with lime (calcium oxide or calcium hydroxide), and stir at 90°C for 2 hours under normal pressure for alkali hydrolysis and precipitation. Precipitation reaction, followed by dehydration and separation; slag is piled up for comprehensive utilization. The clear liquid is put into the reactor again for the next step.

[0019] 2) Fenton oxidation reaction: Fenton reagent is used to carry out oxidation reaction on the wastewater after alkali hydrolysis and precipitation reaction...

Embodiment 2

[0025] Using glyphosate wastewater from an enterprise in Guangxi as the water to be treated, the phosphorous removal treatment was carried out by using alkaline hydrolysis and precipitation reaction, Fenton oxidation reaction, and catalytic reprecipitation process.

[0026] The specific process steps are as follows:

[0027] 1) Alkali hydrolysis and precipitation reaction: After the comprehensive wastewater is measured, it is put into the alkaline hydrolysis reaction kettle, and the pH is adjusted to 7.0-8.0 with lime (calcium oxide or calcium hydroxide). Under normal pressure, stir at 70°C for 2 hours to carry out alkali hydrolysis and precipitation reaction, and then dehydrate and separate; the slag is piled up for comprehensive utilization. The clear liquid is put into the reactor again for the next step.

[0028] 2) Fenton oxidation reaction: Fenton reagent is used to carry out oxidation reaction on the wastewater after alkali hydrolysis and precipitation reaction. Throu...

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Abstract

The invention discloses a treatment method for removing total phosphorus from glyphosate weedicide wastewater, which comprises the following process steps of: performing an alkaline hydrolysis and precipitation reaction, performing a Fenton oxidizing reaction, performing catalytic oxidation and precipitation on calcium hypochlorite and the like. The glyphosate wastewater treated by the method has an excellent dephosphorization effect, the total phosphorus content in effluent reaches the three-level standard (TP is less than or equal to 0.5 mg/L) of the national sewage discharge standard (GB 8978-1996). The dephosphorization process is safe, advanced, clean and low in wastewater treatment cost.

Description

technical field [0001] The invention relates to a method for treating pesticide wastewater, in particular to a process for removing total phosphorus from glyphosate herbicide wastewater. It belongs to the field of environmental protection. Background technique [0002] Glyphosate is a broad-spectrum, high-efficiency, low-toxicity, non-selective post-emergence herbicide. Its chemical name is N-phosphonic acid methyl-glycine, and its trade name is Roundup. In agricultural production, glyphosate has become a national herbicide. The pesticide variety with the largest export volume is also the pesticide variety with the largest output and sales volume in the world. According to industry statistics, as of 2009, my country's glyphosate production scale was about 1 million tons, accounting for 45% of the global production capacity. [0003] During the glyphosate production process, a large amount of waste water containing formaldehyde, dimethyl phosphite, bisglyphosate, glyphosate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F103/36
Inventor 陈远霞谭波施月雪黄春林穆允玲
Owner GUANGXI RES INST OF CHEM IND CO LTD
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