Method for treating recycling of coking wastewater

Abstract

The invention relates to a method for treating recycling of coking wastewater. The method comprises the steps of: A, conveying the coking wastewater which is subjected to biochemical treatment and precipitation into a membrane biological reaction tank by a pump, and removing pollutants such as organic substances, oil content and suspended substances through a membrane bioreactor internally provided with an organic plate type membrane; B, entering a multi-medium filter, and removing turbidity and the partial organic substances through a coarse sand cushion layer, a fine sand filtration layer and an anthracite filtration layer; C, entering an activated carbon filter, and removing partial low molecular organic substances and free chloride in water through the coarse sand cushion layer and the activated carbon filtration layer; D, entering a cartridge filter, and preventing ions in the water from scaling; and E, entering a reverse osmosis device, and intercepting most of soluble salt, colloids, organic substances and microorganisms. The treatment method has the advantages of steady treatment effect, low production running cost, and simple and convenient operation, can treat the effluent of a biochemical sedimentation tank, avoid a physicochemical treatment stage after conventional biochemical treatment, avoid using a medicament in a large quantity, reduce the treatment capacity of sludge of a system, and reduce the operation cost for wastewater treatment.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a treatment method for coking wastewater reuse. Background technique [0002] Wastewater reuse is the implementation method for enterprises to save energy and reduce emissions. Due to the variety of organic matter in coking wastewater and the difficulty in treatment, people pay less attention to the reuse of coking wastewater. The currently implemented wastewater reuse technologies are simplistic. For example, most of the steel industry adopts pretreatment and biochemical treatment before sending them to the coal plant for coal spraying, steelmaking dust removal, and coke oven quenching, etc., resulting in the transfer of pollutants and may also affect the quality of steel products. quality. [0003] According to the requirements for coke oven construction in the "Access Conditions for the Coking Industry" implemented on January 1, 2009: new coke ovens in iron and ste...

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Problems solved by technology

For example, patent document 200710068327.2 uses biochemical effluent to prepare industrial water through oxidative flocculation + air flotation + anion and cation exchange + reverse osmosis; patent document 200810022437.X uses coking wastewater raw water to undergo oil removal treatment and then undergoes multi-media filtration + security filtration + primary Reverse osmosis + two-stage reverse osmosis; both are examples of coking wastewater reuse that have been studied in detail in recent years but have not been practically applied

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