Treatment method for industrial wastewater

Abstract

The invention discloses a treatment method for industrial wastewater. The industrial wastewater is sequentially subjected to hydrolytic acidification treatment, activated sludge treatment, flocculating sedimentation treatment and biological aerated filter treatment. A flocculant added in the flocculating sedimentation treatment is prepared from polydimethyldiallyl ammonium chloride, polyaspartic acid, quaternary ammonium salt, aluminum chloride, acrylamide, polyaluminum ferric chloride, diethylamine acetone methacrylate, coarse tapioca meal, corn-cob powder and the like, and can be used for effectively treating high-concentration and high-turbidity wastewater and inbiodegradable wastewater; the treated water can be recycled; the removal rate of COD (Chemical Oxygen Demand) reaches 80 to 90percent, the removal rate of BOD (Biochemical Oxygen Demand) reaches 60 to 70 percent and the removal rate of heavy metals reaches 93 percent or above; particularly, the treatment method can be usedfor effective treatment of the high-concentration and high-turbidity wastewater and the inbiodegradable wastewater; the removal rate of SS and turbidity can reach 90 percent or above.

Description

technical field [0001] The invention relates to a water treatment agent, in particular to a treatment method for industrial waste water. Background technique [0002] Flocculation is one of the most commonly used key links in wastewater treatment processes. It greatly affects the operating conditions of subsequent processes, final effluent quality and costs, and thus becomes an important scientific and technological research and development field in environmental engineering. An efficient flocculation technology system should be closely combined with excellent flocculants, reactors and self-controlled dosing, among which flocculants play a central role. The key to flocculation treatment technology is to choose a suitable flocculant. There are many ways to classify flocculants. According to different compositions, they can generally be divided into inorganic flocculants, organic flocculants, and natural flocculants (such as biological flocculants). The nature of the charge ...

AI Technical Summary

Problems solved by technology

High-concentration industrial wastewater is not only different from domestic sewage, but also different from general industrial wastewater. It often contains a variety of toxic and harmful refractory organic matter, heavy metal ions and ammonia nitrogen and other pollutants. Due to the single flocculation component, the treatment effect of these high-concentration wastewater is not ideal, especially for the removal of dissolved pollutants in water.

Therefore, for high-concentration wastewater, there is still a lack of a flocculant with broad spectrum, high efficiency, good stability, strong specificity, excellent flocculation performance, and moderate cost performance.