Cold-rolled final emission wastewater treatment system and cold-rolled final emission wastewater treatment method

Abstract

The present invention provides a cold-rolled final emission wastewater treatment system, which is sequentially connected to an electro-oxidation gas flotation device, a middle water pool, a filter water inlet pump, a multi-media filter, an ultra-filtration circulation pool, an ultra-filtration circulation pump, an inorganic ultra-filtration device, an ultra-filtration water production pool and a wastewater conveying pump through pipelines, and an electro-oxidation gas flotation electrode plate for deposing organic matters and generating gas bubbles and an electro-oxidation gas flotation residue scraping are arranged inside the electro-oxidation gas flotation device. According to the present invention, the treatment effect is stable, and the operation is easy; and during the treatment process, the use of coagulants and oxidants is avoided so as to achieve the organic matter and oil removal effect and reduce the wastewater treatment operation cost.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a treatment system and method for the final discharge wastewater from cold rolling in the iron and steel industry. Background technique [0002] In June 2012, the Ministry of Environmental Protection of the People's Republic of China promulgated the latest wastewater discharge standard for the iron and steel industry "Discharge Standards for Water Pollutants in the Iron and Steel Industry" (GB13456-2012). The new standard sets stricter emission limits for major pollutants. For example, in the Discharge Standard of Water Pollutants for the Iron and Steel Industry (GB13456-1992), the primary standard requires CODcr≤100mg / L, oil≤8mg / L, SS ≤70mg / L, while the new standard table 3 cold rolling wastewater discharge regulations, CODcr≤30mg / L, oil ≤1mg / L, SS≤20mg / L. In addition, the new standard adds some pollutant discharge control items, such as total iron, total co...

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Problems solved by technology

Although the effluent quality of this process can meet the standards in Table 3 of the "Discharge Standards for Water Pollutants in the Iron and Steel Industry" (GB13456-2012), activated carbon is a consumable material. Replacing the filler after adsorption is saturated, not only the operating cost is high, but also the operation is difficult.

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