Treatment method of dimethoate pesticide production wastewater

Abstract

The invention discloses a treatment method of dimethoate pesticide production wastewater. The problem of difficulty in degradation of high salts, high phosphorus, high nitrogen and the like in the dimethoate pesticide production wastewater can be effectively solved through early-stage air floatation, MVR (short for Mechanical Vapor Recompression), evaporative desalination and dephosphorization, Fe / C micro-electrolysis reaction, coagulating sedimentation, air stripping and other treatment steps, the salt content, the total phosphorus, the total nitrogen and the CODcr value of the wastewater can be effectively reduced, the ratio of BOD5 (biochemical oxygen demand) to CODcr in the wastewater is increased, the biochemical treatment requirements are met, the dimethoate pesticide production wastewater is discharged after being up to standard, and meanwhile, the process is applicable to treatment of other similar industrial wastewater difficult to degrade.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a treatment method for high-salt and refractory dimethoate pesticide production wastewater. Background technique [0002] Dimethoate pesticide is one of the most widely used organophosphorus insecticides at home and abroad, and is mainly used for killing insects and mites in farmland. Dimethoate pesticide production wastewater has the characteristics of oil content, high salinity, high toxicity, high concentration of organic pollutants and refractory degradation. Commonly used treatment methods include coagulation, adsorption, chemical oxidation and biochemical methods. Most of these processes There are problems such as unsatisfactory pretreatment effect, high cost, and difficulty in stabilizing the treated water quality. [0003] Dimethoate production wastewater has a high salt content, mainly Cl - , SO 4 2- and other salts. Due to the inhibitory effect of high-salt substances on...

AI Technical Summary

Problems solved by technology

Organophosphorus has a strong inhibitory effect on the growth of microorganisms, causing its wastewater to often have the characteristics of strong odor, high toxic and harmful concentrations, and complex components. It is a kind of high-concentration wastewater that is extremely difficult to treat.

[0005] The treatment process of common dimethoate pesticide wastewater only considers the improvement of BOD 5 / COD cr It is beneficial to the subsequent biochemical treatment, but the removal of phosphorus is not considered, resulting in the phenomenon of high phosphorus in the wastewater, and it is difficult for the subsequent biochemical treatment to make the phosphorus content of the effluent reach the standard, resulting in excessive phosphorus in the treated wastewater or increased phosphorus removal. cost

At the same time, in order to meet the biochemical requirements, the salinity in the wastewater has not been reduced or a part has been reduced. During the biochemical treatment, dilution treatment is required, which wastes water resources and increases the total amount of wastewater treatment.

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