Industrial wastewater advanced treatment and recycling system

Abstract

The invention discloses an industrial wastewater advanced treatment and recycling system. The industrial wastewater advanced treatment and recycling system comprises a settling pond, a coarse filtering device, an advanced oxidation device, a fine filtering device and a circulating pond, wherein the settling pond is connected with the coarse filtering device through a pipe; the coarse filtering device is connected with the advanced oxidation device through a pipe; the deep oxidation device is connected with the fine filtering device through a pipe; the fine filtering device is connected with the circulating pond through a pipe; the circulating pond is connected with a cooling tower of the coarse filtering device and a cooling tower of the fine filtering device through circulating pipes; and the deep oxidation device comprises an ozone pretreatment device and an ozone / activated carbon combined treatment device which are successively connected with each other through a pipe. After coarse filtration, advanced oxidation and fine filtration on industrial wastewater are carried out by using the industrial wastewater advanced treatment and recycling system, the industrial wastewater reaches the standard of recycled water. The wastewater can be totally recycled to serve as replenished water for cooling water, a large quantity of precious water resources are saved, zero drainage of the wastewater is realized, and moreover, the industrial wastewater advanced treatment and recycling system is beneficial to environmental protection.

Description

technical field [0001] The invention belongs to industrial wastewater treatment technology, in particular to an industrial wastewater advanced treatment and reuse system. Background technique [0002] At present, in large chemical plants, a large amount of industrial wastewater is produced every day, even after biological or physical treatment, its COD (chemical oxygen demand) and turbidity can only meet the secondary discharge standard (COD is usually 90mg / L); at the same time, the cooling tower of the factory needs to add a large amount of cooling water, but directly adding the treated wastewater will lead to a sharp increase in the bacterial content of the cooling water, which will affect the cooling effect and the service life of the equipment, and will also bring additional maintenance , Clean up costs. Contents of the invention [0003] The purpose of the present invention is to provide a system for advanced treatment and reuse of industrial wastewater, which can ma...

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Problems solved by technology

[0002] At present, in large-scale chemical plants, a large amount of industrial wastewater is produced every day. Even after biological or physical treatment, its COD (chemical oxygen demand) and turbidity can only meet the secondary discharge standard (COD is usually 90mg / L); at the same time, the cooling tower of the factory needs to add a large amount of cooling water, but directly adding the treated wastewater will lead to a sharp increase in the bacterial content of the cooling water, which will affect the cooling effect and the service life of the equipment, and will also bring additional maintenance , cleanup costs

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