System for recycling and treating coking wastewater

Abstract

The invention relates to a system for recycling and treating coking wastewater. The system comprises an electrocoagulation floatation pond, an electrocoagulation floatation dregs-scraping machine, an electrocatalysis oxidation pond, a membrane biological reaction pond, a membrane bioreactor water-discharging pump, a multi-medium filter, a carbon filter, a security filter, a reverse osmosis high pressure pump, a reverse osmosis device, a reverse osmosis water-producing pond, a reverse osmosis water-producing delivery pump, a filter reverse washing pond, a filter reverse washing pump, a reverse osmosis washing pond, a reverse osmosis washing pump, a reverse osmosis concentrated water pond, a reverse osmosis concentrated water delivery pump and a pipeline mixer, wherein the electrocoagulation floatation pond is internally provided with an electrocoagulation electrode and an electric floatation electrode; the electrocatalysis oxidation pond is internally provided with an electrocatalysis oxidation electrode; and the membrane biological reaction pond is internally provided with a membrane bioreactor. The treatment system has stable treatment effect, low production and operation cost, and convenient and simple operation, can treat and utilize the water drained from a biochemical precipitation pond, avoid the physical and chemical treatment section after the normal biochemical treatment, avoid using a large amount of medicament, reduce the sludge treatment amount of the system and lower the operation cost of wastewater treatment.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a coking wastewater reuse treatment system. 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 steel e...

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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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