Method and apparatus for treating and recycling carbonized wastewater

Abstract

The invention relates to a coking waste water treatment reuse method and a device thereof. The method comprises the following process steps: 1. strengthening pretreatment; 2. biological treatment; and 3. reuse water treatment. The structure of the method is as follows: electrochemical equipment at the strengthening pretreatment step is connected with a water outlet of an air float and a water inlet of biological treatment; and a water outlet pipe of an MBR water outlet tank at the biological and sludge treatment step is connected in serial with an ozone contact tower, an active carbon filter tower and an RO at the reuse water treatment step. The method has the advantages of providing a novel combination process for the coking waste water, effectively combining the technologies of de-oiling, biochemistry, electrochemistry and membrane, improving the biodegradability of difficultly degraded pollutants by utilizing the electrochemical strengthening pretreatment, strengthening the biochemical treatment by MBR, reasonably designing the reuse treatment of ozone-active carbon-RO, solving the problem of the difficult treatment of coking waste water and achieving the aim of the reuse of the coking waste water.

Description

technical field [0001] The invention relates to a coking wastewater treatment and reuse method and a device thereof, belonging to the technical field of industrial wastewater treatment. Background technique [0002] Coking wastewater is mainly composed of water in coking coal, wastewater from gas purification process, tar and wastewater from crude benzene processing. It is a high-concentration refractory industry containing phenol, cyanide, oil, ammonia and a large amount of inorganic and organic substances. waste water. [0003] At present, the domestic coking wastewater treatment technology is mainly biological treatment, which is not only the conventional "A-0" and "A-A-0" process, but part of the coking wastewater is treated to the third-level standard COD<500mg / L to directly quench the coke, and transfer the pollution to Atmosphere, while most coking wastewater is treated to COD150-500mg / L, seriously polluting the water environment. With the maturity and promotion o...

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Problems solved by technology

[0003] At present, the domestic coking wastewater treatment technology is mainly biological treatment, which is not only the conventional "A-0" and "A-A-0" process, but part of the coking wastewater is treated to the third-level standard COD<500mg / L to directly quench the coke, and transfer the pollution to Atmosphere, while most coking wastewater is treated to COD150-500mg / L, seriously polluting the water environment. With the maturity and promotion of CDQ technology, the country has banned the use of treated coking wastewater for coke quenching, and strictly The treatment of coking wastewater reaches the first-level discharge standard, that is, COD<10Omg / L

However, the main coking wastewater treatment system actually operated in China is still "oil removal pretreatment - hydrolytic acidification - anoxic - aerobic - contact oxidation - precipitation - dosing precipitation - ceramsite filtration - activated carbon adsorption", its biological treatment and filtration treatment It cannot meet the first-level emission standard of COD<100mg / L, and the adsorption life of activated carbon is too short, so frequent replacement is unaffordable economically, and the purpose of first-level emission and treatment and reuse cannot be achieved at all.

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