Coking wastewater comprehensive treatment method and system thereof

Abstract

The invention discloses a coking wastewater comprehensive treatment method comprising the following steps of: pre-treatment, biochemical treatment and deep treatment. The deep treatment step comprises sequential steps of filtering, ultra-filtering, carrying out resin adsorption, re-filtering, and carrying out reverse osmosis. With the adoption of a coking wastewater comprehensive treatment system of the coking wastewater comprehensive treatment method, the pre-treatment step adopts a de-oiling pond, an adjusting pond and an air floating pond, which are connected in sequence; the biochemical treatment step adopts a primary aeration pond, a primary settling pond, an oxygen-poor pond, an aerobic pond and a secondary settling pond, which are connected in sequence; and the deep treatment step adopts a multi-medium filter, an ultra-filtering device, a resin adsorption column and a reverse osmosis device. The coking wastewater comprehensive treatment method has the beneficial effects that the method is stable to operate and has a simple process and good treating effects.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a comprehensive treatment method and system for coking wastewater. Background technique [0002] Coking wastewater is produced in the process of high-temperature dry distillation of coal, gas purification and rectification of chemical products. Its composition and properties are closely related to raw coal quality, carbonization temperature, production technology and recovery methods of chemical products. It is a kind of waste water containing a large amount of toxic and harmful Substance waste water is quite harmful to the environment. There are two basic ways to solve the problem of coking wastewater pollution: one is to reform the process, strengthen operation management, reduce production water, directly reduce discharge, reduce waste water, repeat and recycle water, and fundamentally eliminate and reduce pollutant discharge; The second is to carry out relevant treatment ...

AI Technical Summary

Problems solved by technology

[0003] The traditional treatment process has a low removal rate of ammonia nitrogen and COD, and the water quality after pretreatment and biochemical treatment still cannot meet the national first-level discharge standard

In recent years, two-stage reverse osmosis devices have been used in the advanced treatment of coking wastewater, which has greatly improved the removal of ammonia nitrogen and COD. Frequent flushing will cause greater damage to the membrane and greatly reduce the service life, which increases the cost of investment and operation

Images