Device for deep treatment and complete recovery of coking wastewater and application method thereof

Abstract

The invention discloses a device for deep treatment and complete recovery of coking wastewater and an application method thereof. The device comprises a pretreatment system and a biochemical treatment system and is characterized in that an outlet of coking wastewater after pretreatment and biochemical treatment is connected with a membrane bioreactor; the water outlet of the membrane bioreactor is connected with an oxidation treatment component; the water outlet of the oxidation treatment system is connected with a reverse osmosis membrane treatment component; one water outlet of the reverse osmosis membrane treatment component is connected with a concentrated water evaporation and crystallization system; and the other water outlet of the reverse osmosis membrane treatment component is connected with a recycling water tank. The invention combines the technologies of biochemical treatment, oxidation, membrane separation and evaporation for deep treatment of the coking wastewater and realizes zero emissions. Therefore, the device and the application method are a novel treatment device and a novel application method for degradation of various pollutants in the coking wastewater and complete recovery of water after treatment.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a coking wastewater advanced treatment and full recycling device and an application method thereof. Background technique [0002] At present, A / O biological denitrification treatment technology is generally used in the treatment of coking wastewater. The water quality index of the treated sewage can meet the discharge standards stipulated by the state, and part of it can be reused in wet coke quenching, dust removal, gas water sealing and other turbid circulating water systems as supplements. However, the advanced treatment of coking wastewater generally adopts sand filtration, biological filter, coagulation treatment and other means. Although the COD of the effluent is controlled at about 100mg / L and the content of suspended solids is about 30mg / L, it cannot meet the requirements of production water purification. Water quality requirements; some use activ...

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Problems solved by technology

[0002] At present, A / O biological denitrification treatment technology is generally used in the treatment of coking wastewater. The water quality index of the treated sewage can meet the discharge standards stipulated by the state, and part of it can be reused in wet coke quenching, dust removal, gas water sealing and other turbid circulating water systems as supplements. However, the advanced treatment of coking wastewater generally adopts sand filtration, biological filter, coagulation treatment and other means. Although the COD of the effluent is controlled at about 100mg / L and the content of suspended solids is about 30mg / L, it cannot meet the requirements of production water purification. Water quality requirements; some use activated carbon filtration, which can effectively remove COD and suspended solids in water, so that COD can be reduced to below 60mg / L, and the content of suspended solids is below 5mg / L, but there is almost no treatment for the dissolved solid salt content effect, so the technology has no promotional value

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