Method for pretreatment of propylene oxide wastewater by using micro-electrolysis

Abstract

The invention relates to a method for pretreatment of propylene oxide wastewater by using micro-electrolysis. The method comprises the following steps: firstly enabling the process wastewater produced from the production of propylene oxide to pass through a cooling tower, cooling water temperature to below 40 DEG C, then entering an aluminum-silicon micro-electrolysis device to perform low-pressure catalytic electrolysis treatment, enabling the wastewater to enter from the bottom of the aluminum-silicon micro-electrolysis device and exit from the upper part of the aluminum-silicon micro-electrolysis device, performing electrolysis for 10-15 minutes, and simultaneously introducing air into the aluminum-silicon micro-electrolysis device for aeration, wherein the flow rate of introducing the air is 5000m<3> / h; and enabling the wastewater after the treatment by the aluminum-silicon micro-electrolysis device to enter a precipitation tank for precipitating for 0.5-1 hour, and enabling the wastewater after precipitation to enter a biochemical tank for performing biological treatment. According to the method, the concentration of organic chlorides in the propylene oxide wastewater can be effectively reduced, the pollution load and the pH value of the wastewater are simultaneously reduced, sewage can be prevented from causing an impact on a treatment device, the treatment efficiency of the wastewater by a late-stage active sludge method is improved, the wastewater can achieve the emission standard, the environmental pollution is reduced, and the method has good social benefits and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of chemical wastewater treatment, in particular to a method for pretreating propylene oxide wastewater by micro-electrolysis. Background technique [0002] At present, the industrial production of propylene oxide mainly uses propylene and chlorine as raw materials. The reaction process will produce intermediate products such as organic chlorides. These intermediate products are toxic to microorganisms. After entering the wastewater, it will bring great difficulties to biochemical treatment. When the concentration of organic chloride in the wastewater exceeds 50mg / l, it will inhibit the microorganisms. When the concentration of organic chloride in the wastewater reaches 150mg / l, the microbial dehydrogenase will be inactivated and the microorganism will die. At present, the pollutants in the wastewater produced by industrial production of propylene oxide contain organic chlorides such as chloropropanol, the av...

AI Technical Summary

Problems solved by technology

At present, the pollutants in the wastewater produced by industrial production of propylene oxide contain organic chlorides such as chloropropanol, the average COD is as high as 1000mg / l, and the Cl - 20000~24000mg / l, PH≥12, when the single activated sludge method is used to treat sewage, the excessive organic chloride in the sewage can reduce the activity of microorganisms until they die, which will affect the treatment effect of sewage treatment equipment

In addition, the current single propylene oxide sewage treatment method often leads to frequent abnormal water quality of sewage, and the fluctuation range of water quality is large, which has an impact on the sewage treatment device, resulting in the unstable operation of the sewage treatment plant.

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