Processing system for implementing coking waste water reuse and processing method

Abstract

The invention discloses a treatment system and a treatment method that can realize the reuse of coking wastewater. The treatment system comprises a coagulating sedimentation tank, a photocatalytic O3 oxidation device and a filtration device; wherein the coagulating sedimentation tank is provided with a water inlet for introducing biochemical effluent and a sediment discharge port, the water outlet of the coagulating sedimentation tank is connected with the water inlet of the photocatalytic O3 oxidation device, the water outlet of the photocatalytic O3 oxidation device is connected with the water inlet of the filtration device, and the filtration device is provided with a water outlet connected with a recycled pipe. The invention can finish three stages of treatment, namely the coagulation, photocatalytic O3 oxidation and filtration of coking wastewater, and can decompose the harmful complex polymeric organic compounds in the coking wastewater into micro-molecular compounds or directly mineralize the harmful complex polymeric organic compounds by the organic combination of the coagulating sedimentation tank, the photocatalytic O3 oxidation device and the filtration device; therefore, the treatment system and the treatment method of the invention can ensure that the COD satisfies the standard of the production reuse water, further reduces the concentration of ammonia nitrogen, and has the functions of discolorization, deodorization and sterilization at the same time.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a combined treatment system and treatment method for coking wastewater reuse. Background technique [0002] Coking wastewater is a typical wastewater containing a large amount of aromatic compounds and heterocyclic compounds produced in the process of coal coke, gas purification and coking product recovery. It has the characteristics of large wastewater discharge, high concentration of organic matter and ammonia nitrogen, and complex organic matter components. Refractory organic wastewater. [0003] With the upgrading of the coking industry structure and the standardization of market competition order, the National Development and Reform Commission implemented the "Access Conditions for the Coking Industry" in 2005, which clearly pointed out that the coking wastewater should be recycled internally after treatment, and the phenol cyanide wastewater should be recycled in the fac...

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Problems solved by technology

Although the adsorption method is simple to operate, easy to manage, and relatively low in operating costs, the treatment facilities occupy a large area, and the pollutants are only transferred from the water to the sludge without harmless degradation, and a large amount of sludge is produced. The regeneration problem of the

Membrane separation technology mainly relies on physical interception to remove pollutants. The process control is highly automated and the treatment effect is good. However, the cost of membranes is still high at this stage, and the problem of membrane fouling is becoming more and more prominent, especially when it is applied to industrial wastewater treatment. The final fate of the concentrate produced during processing remains a longstanding question

The above factors limit the application of adsorption method and membrane separation technology in the advanced treatment of coking wastewater to a large extent, and seek a treatment system with good treatment effect, no secondary pollution and effective decomposition of organic matter in coking wastewater and The treatment process is a problem that needs to be solved in the advanced treatment of coking wastewater

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