Technology for deeply processing coking wastewater through combining catalytic oxidation method and membrane separation technique

Abstract

The invention relates to a technology for deeply processing coking wastewater through combining catalytic oxidation method and membrane separation technique. Preprocessed coking wastewater is processed through pretreatment, A / O biochemical treatment, catalytic oxidation, coagulating sedimentation, ultrafiltration and reverse osmosis treatment. The invention has the advantages that the technology can greatly reduce the amount of COD, suspended substance and pollutant and the like, and has the advantages of low investment once, stable treatment effect and high water yield. Water from catalytic oxidation is separated through a coagulative precipitation tank, and clean water can be used for production, daily use or slag washing in iron works. Water from reverse osmosis can be directly reused as make-up water in water circulating systems, thereby realizing reutilization of water sources and zero discharge of coking wastewater. The technology has remarkable social benefits.

Description

technical field [0001] The present invention relates to a treatment process of coking wastewater, in particular to a process for advanced treatment of coking wastewater by combining catalytic oxidation and membrane separation technology, aiming to provide a process that can greatly reduce various types of coking wastewater. New technology for advanced treatment of coking wastewater with pollutant content. Background technique [0002] At present, A / O biological denitrification treatment technology is generally used in the treatment of coking wastewater. The water quality index after treatment can reach the discharge standard stipulated by the state, and part of it can be reused as supplementary water for turbid circulating water systems such as wet coke quenching, dust removal, and gas water sealing. . The advanced treatment of coking wastewater generally adopts sand filtration, biological filter, coagulation treatment and other means. Although the COD of the effluent is co...

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Problems solved by technology

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 water quality requirements of production water purification. ; 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 it has almost no effect on the dissolved solid salt content. , Activated carbon loses its effect after adsorption and saturation, the regeneration process is more complicated, and the cost is higher, so only a single activated carbon filter unit cannot achieve the purpose of recycling and has no promotion value

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