Cold rolling thin alkali biochemical effluent depth treatment method and system

Abstract

The invention provides a cold rolling thin alkali biochemical effluent depth treatment method and system. The method comprises the following steps that cold rolling thin alkali biochemical effluent passes through a heat exchanger, then enters a coagulative precipitation tank, then enters a two-level pH regulating tank and then enters an ozone catalytic oxidizing tower, wherein the ozone adding amount is 250-600 mg / L; the cold rolling thin alkali biochemical effluent passing through the ozone catalytic oxidizing tower enters a multilayer filtering adsorption tower and then is discharged up to the standard. The system solves the problem of standard exceeding of cold rolling waste organic pollutants, and the cold rolling thin alkali biochemical effluent treated with the method and the system can reach the new national discharging standard; the cold rolling thin alkali biochemical effluent treatment technology is stable in treatment effect, low in production operation cost, easy and convenient to implement and high in automation degree.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an advanced treatment method and system for cold-rolled dilute alkali biochemical effluent. Background technique [0002] The iron and steel industry is an industry with high energy consumption, high resources, and high pollution. Its water consumption is huge, accounting for about 14% of the national industrial water consumption. [0003] In July 2005, the National Development and Reform Commission issued the "Iron and Steel Industry Development Policy", which put forward higher goals and more specific requirements for the iron and steel industry to develop circular economy, save energy and resources, and take the road of sustainable development. Under these conditions, low energy consumption, low pollution, and low emissions have become the needs of social development. [0004] The cold rolling dilute alkali biochemical effluent mainly comes from the oil de...

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Problems solved by technology

[0009] In order to solve the above problems, the object of the present invention is to provide a method and system for advanced treatment of cold-rolled dilute alkali biochemical effluent. The system solves the problem of excessive cold-rolled waste organic pollutants. Can meet the new national emission standards

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