Catalytic wet oxidation pretreatment method of glyphosate production wastewater

Abstract

The invention relates to a catalytic wet oxidation pretreatment method of glyphosate production wastewater, comprises the following steps: firstly regulating pH value to be more than 8 and less than 10, adding a multi-component homogeneous catalyst and carrying out oxidative degradation on pollutants in wastewater for 0.3-2 hours by using a continuous catalytic wet oxidation device with air as an oxidizing agent at the reaction temperature of 210-230 DEG.C and the reaction pressure of 2-4MPa, wherein the catalyst is a soluble transition metal salt mixture. By adopting the method for treating the glyphosate production wastewater, the organic phosphorus conversion rate is high, the COD (chemical oxygen demand) removal rate is high, the biodegradability of the wastewater can be improved, and the secondary pollution is avoided. The method has the advantages that the catalyst activity is high, low in cost and easy to get, reaction conditions are relatively mild, and continuous operation is easily implemented; the glyphosate production wastewater can be discharged in standard through the combined process of catalytic wet oxidation pretreatment-routine technical dephosphorization and deamination-biochemistry, and the industrialized application prospect is great.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a catalytic wet oxidation pretreatment method for glyphosate production wastewater. Background technique: [0002] Glyphosate is a high-efficiency, low-toxicity, broad-spectrum herbicide with rapid metabolism and less residue, which meets environmental protection requirements and has a long-term market prospect. With decades of popularization and application, glyphosate has become the world's largest-selling pesticide technical and the fastest-growing herbicide, accounting for 30% of the total herbicide production, surpassing the top 10 sales other than glyphosate. The sum of good active ingredient sales. [0003] At present, there are two main synthetic routes of glyphosate: glycine process and IDA process. The above two glyphosate synthesis routes both produce a large amount of high-concentration (COD>40000mg / L) wastewater, in which the total ...

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Problems solved by technology

[0005] The calcium chloride precipitation method cannot effectively separate organic phosphorus compounds; the micro-electrolysis technology has complex equipment, the treatment effect cannot meet the emission requirements, and industrial scale-up application is difficult; the organic phosphorus decomposition rate of the catalytic alkaline hydrolysis technology is not high, and the COD removal rate is low

[0006] Due to the presence of membrane fouling in membrane separation technology, there is no economical and effective treatment method for the concentrated mother liquor after separation. In addition, problems such as high investment and operating costs also limit the application of membrane technology in this wastewater treatment.

[0007] Although the complex extraction technology can recover part of glyphosate technical, but the recovery phase composition is complex, the glyphosate content is low, it is difficult to use, and there is difficulty in phase separation, and it is difficult for the treated wastewater to meet the total phosphorus discharge target

[0008] Although the wet oxidation technology can realize the effective pretreatment of the wastewater, there are problems such as high reaction temperature (usually above 260°C), high reaction pressure (greater than 6MPa), high equipment investment and operating costs, and some difficulties in practical application.

[0009] In the Glyphosate Forum, "Glyphosate Production Wastewater Treatment Technology Analysis and Research" only mentioned, but did not really disclose the technology of catalytic wet oxidation treatment of glyphosate wastewater, and the COD removal rate was only 75%.

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