Method and apparatus for reducing electrical conductivity and total iron in cold-rolled hydrochloric acid regeneration wastewater

Abstract

The invention relates to a method and an apparatus for reducing the electrical conductivity and the total iron in cold-rolled hydrochloric acid regeneration wastewater. According to the present invention, cold-rolled hydrochloric acid regeneration wastewater enters an integrated agent adding precipitation pool, 1000-2500 mg / L calcium hydroxide or sodium hydroxide is added to the integrated agent adding precipitation pool, the PH value is controlled at more than 10, a 5-15 mg / L in-situ compound auxiliary coagulant is added, the cold-rolled hydrochloric acid regeneration wastewater, the calcium hydroxide or sodium hydroxide, and the in-situ compound auxiliary coagulant are mixed and stirred at the front portion of the integrated agent adding precipitation pool, the mixture enters a PH value adjustment pool, the PH value of the wastewater is adjusted to 6-9, and the PH value adjusted wastewater enters a fly ash adsorption tower and is subjected to periodic backwashing treatment so as to obtain the treated cold-rolled hydrochloric acid regeneration wastewater; and with the technical scheme, the environmental pollution can be reduced, and the increasingly stringent environmental protection laws and regulations can be met.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and a device for efficiently reducing electrical conductivity and total iron in cold rolling hydrochloric acid regeneration wastewater in the metallurgical field. Background technique [0002] The iron and steel industry is an industry with high energy consumption, high resources, and high pollution. Its water consumption is huge, accounting for about 14% of the national industrial water consumption. [0003] In July 2005, the National Development and Reform Commission issued the "Iron and Steel Industry Development Policy", which put forward higher goals and more specific requirements for the iron and steel industry to develop circular economy, save energy and resources, and take the road of sustainable development. Under these conditions, low energy consumption, low pollution, and low emissions have become the needs of social development. [0004] ...

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Problems solved by technology

[0008] In view of the problems referred to above, the object of the present invention is to: provide a kind of treatment method and system device thereof that reduces the electrical conductivity of cold-rolled hydrochloric acid regeneration wastewater and total iron, and the treatment of reducing the electrical conductivity of cold-rolled hydrochloric acid regeneration wastewater of the present invention and total iron According to the water quality and quantity of cold-rolled hydrochloric acid regeneration wastewater, an economical and efficient technical solution for reducing electrical conductivity and total iron is developed to reduce environmental pollution, systematically solve the problem of environmental pollution from hydrochloric acid regeneration wastewater, and actively respond to the Strict environmental protection regulations, so the present invention belongs to the steel green environmental protection production process system

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