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Comprehensive treatment method for glyphosate wastewater

A technology for comprehensive treatment of glyphosate wastewater, applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems that are difficult to achieve, increase treatment costs, increase the cost of chemical use, etc. problem, to achieve good removal effect, to achieve the effect of removal effect

Active Publication Date: 2016-02-10
JIANGSU YANGNONG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After pretreatment and biochemical treatment, the total phosphorus of glyphosate wastewater is generally difficult to meet the requirement of less than 8ppm. At present, the phosphorus removal process generally adopted for biochemical wastewater at home and abroad is mainly the method of dosing, sedimentation and filtration.
The agents mainly include: polyferric chloride, polyferric sulfate, polyaluminum chloride or mixtures, etc. Although the treatment effect can meet the requirements, the disadvantage is that more anions such as chloride ions and sulfate radicals are added to the wastewater, and the addition of chemical The cost
In addition, since most of the chemicals used are acidic chemicals, the treated wastewater still needs to use more alkaline materials to adjust the pH value before it can be discharged, which further increases the treatment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 1000g of phosphorus-containing wastewater, add 2.5g of 30% hydrochloric acid under stirring at 20°C, and adjust the pH to 4.2. Gradually add the above-mentioned aluminum-containing wastewater at this temperature, and keep it warm for 35 minutes, maintain the end point pH=6.15, and consume 3.4g of aluminum-containing wastewater. Add 3.5 g of 0.3% cationic PAM (polyacrylamide) flocculant aqueous solution under stirring state, continue to stir for 5 minutes and then let it stand still, a certain amount of precipitation occurs. After being poured and filtered, the clear liquid was taken for analysis, wherein the aluminum element content was 1.8ppm, the total phosphorus was 4.5mg / L, the COD was 312mg / L, and the chloride ion content was 0.08%. According to the calculation, the removal rate of aluminum element reaches 98.8%, the removal rate of total phosphorus reaches 95.5%, and the removal rate of COD reaches 63.3%.

Embodiment 2～8

[0033] The test process is basically the same as in Example 1, and the optimization of the technical control point and the analysis of its results are specifically shown in Table 1:

[0034] Table 1: Statistics of Experimental Data of Embodiments 2 to 8

[0035]

Embodiment 9

[0037] Take 1000 g of phosphorus-containing wastewater, and add 3.5 g of the above-mentioned aluminum-containing wastewater under stirring at 20° C., and the pH at this time is 9.6. Gradually add 30% hydrochloric acid at this temperature and keep it warm for 35 minutes to maintain the end point pH=6.28 and hydrochloric acid 2.4. Add 3.5 g of 0.3% PAM aqueous solution under stirring state, continue to stir for 5 min and then let it stand still, a certain amount of precipitation occurs. After being poured and filtered, the clear liquid was taken for analysis, wherein the aluminum element content was 17.55ppm, the total phosphorus was 14.1mg / L, the COD was 503mg / L, and the chloride ion content was 0.08%. According to the calculation, the removal rate of aluminum element reaches 88.83%, the removal rate of total phosphorus reaches 85.9%, and the removal rate of COD reaches 40.82%.

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Abstract

The invention discloses a comprehensive treatment method for glyphosate wastewater. Pollutant factors are removed from phosphoric wastewater and aluminiferous wastewater, generated from different technical processes for IDA-route glyphosate synthesis of a preparation process which takes diethanolamine as a starting raw material and contains a dehydrogenation catalyst, through interaction. According to the method disclosed by the invention, through adjusting and optimizing technical control key points such as material proportion, pH and reaction temperature, carrying out dephosphorizing by using sodium metaaluminate wastewater instead of a dephosphorizing agent so as to produce aluminum phosphate precipitates and removing the aluminum phosphate precipitates, not only can a better phosphorus and aluminum removing effect be achieved, but also the aim of treating the waste with the waste is achieved. The method has the advantages of environment-friendliness, economizing and the like.

Description

technical field [0001] The invention belongs to the field of resourceful and harmless treatment of mother liquor in glyphosate production technology. Background technique [0002] Glyphosate is a systemic herbicide that is highly destructive to the underground tissues of perennial weeds, but it loses its activity when it enters the soil. It has no adverse effects on crop growth when it is planted on the same day after the application. Therefore, it is widely used in tea gardens, mulberry gardens, orchards, fallow fields, wheat, rapeseed and other no-tillage fields for weeding before sowing, and for directional spraying between rows in corn and cotton fields to control almost all annual or perennial weeds. [0003] At present, there are many techniques for preparing glyphosate, mainly glycine method and IDA method. At present, the IDA method has gradually become the development trend in the future, and the diethanolamine dehydrogenation and oxidation route in the IDA method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/36
Inventor 戚明珠王东朝孔勇王宝林颜开开熊书义严洁陈详春
Owner JIANGSU YANGNONG CHEM
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