Pretreatment device for methomyl manufacturing wastewater

Abstract

The invention relates to the technical field of wastewater treatment of methomyl and particularly relates to a pretreatment device for methomyl manufacturing wastewater. The pretreatment device comprises an electrical heating reaction vessel, an alkaline hydrolysis tank and an aeration tank, wherein a vertically upwards first pipeline is arranged at the top of the electrical heating reaction vessel; the top of the first pipeline is connected with a condenser pipe; a dropping pipe is arranged at the bottom of the condenser pipe and located just above the alkaline hydrolysis tank; the alkaline hydrolysis tank and the aeration tank are communicated by virtue of a second pipeline; a one-way valve is arranged on the second pipeline; a third pipeline communicated with the interior of the aeration tank is mounted on the aeration tank; a solenoid valve used for controlling the on-off of the third pipeline is arranged on the third pipeline; a bracket is erected at the top of the aeration tank;a stirrer is arranged on the bracket; a stirring shaft of the stirrer stretches into the aeration tank. The pretreatment device disclosed by the invention is capable of realizing automatic alkaline hydrolysis, air aeration and flocculating treatment of the wastewater and completing wastewater pretreatment, and has the advantages of simple operation, low equipment cost, low energy consumption and high practicality.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment of methomyl, in particular to a pretreatment device for wastewater produced by methomyl. Background technique [0002] Methomyl is an oxime carbamate insecticide, acaricide, nematocide and molluscicide, developed by DuPont Company of the United States in 1966, with contact killing, stomach poisoning and ovicidal effects, and strong lethality , quick effect, wide insecticidal spectrum, low residue, wide range of crops, safe to use, widely used in cotton, cabbage, tobacco, citrus, soybeans, peanuts and more than 30 kinds of crops. [0003] The wastewater produced by methomyl is light yellow in color and has an unpleasant stench. The COD is between 30,000 and 40,000 mg / L, and it has the characteristics of high COD, high toxicity, poor biodegradability, and refractory degradation. The main characteristic pollutants in wastewater are methomyl CH3NH-CO-ON=C(CH3)-SCH3 and methomyl oxime HON...

AI Technical Summary

Problems solved by technology

[0004] At present, the more popular treatment methods are pyrolysis at 120°C, and the COD removal rate after treatment is stable at 60-85%, or ultrasonic degradation. Methomyl can be completely converted into inorganic substances after ultrasonic treatment for 35 minutes. Most of the equipment involved is expensive and consumes a lot of energy, so it is not used and promoted on a large scale

Images