Treatment method and treatment apparatus for standard discharging of cold-rolled dilute alkali wastewater

Abstract

The invention provides a treatment method and a treatment apparatus for standard discharging of cold-rolled dilute alkali wastewater. The treatment method comprises that cold-rolled dilute alkali wastewater enters a PH value coarse-adjustment pool, wherein the pH value of the effluent of the coarse-adjustment pool is 6-9; the obtained wastewater enters a PH value fine-adjustment pool, wherein the PH value of the dilute alkali wastewater is controlled at 7-8 by the effluent of the fine-adjustment pool; the PH value adjusted cold-rolled dilute alkali wastewater enters an aerobic biochemical pool; the cold-rolled dilute alkali wastewater is treated in the aerobic biochemical pool, and then flows into an inclined plate precipitation pool through gravity; the cold-rolled dilute alkali wastewater is treated in the inclined plate precipitation pool, and then enters an ultraviolet light reactor through a reactor lifting pump; and finally the cold-rolled dilute alkali wastewater enters an adsorption tower and is subjected to standard discharging. With the method and the system of the present invention, the advantages of low one-time investment, simple operation and low production and treatment cost are provided, and the method is the environment-friendly steel and iron wastewater treatment process.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a treatment process and device for standard-reaching discharge of cold rolling dilute alkali wastewater. Background technique [0002] Cold rolling dilute alkali wastewater mainly comes from the oil depot drainage of various units such as rolling mill unit, grinding roll room and strip steel degreasing unit. The cold rolling dilute alkali wastewater after conventional treatment cannot meet the environmental protection discharge requirements stipulated by the state. [0003] The Chinese patent "A Treatment Process for Alkali-Containing and Oily Wastewater" (CN101684025A) discloses a process for treating alkali-containing and oily wastewater. The process is to neutralize the alkali-containing and oil-containing wastewater first, then pass through inclined plate sedimentation, paper tape filtration, ultrafiltration treatment in turn, and finally discharge. This...

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Problems solved by technology

[0006] In order to solve the environmental pollution problem of cold-rolled dilute alkali wastewater, the object of the present invention is to provide a treatment method and a treatment device for the discharge of cold-rolled dilute alkali wastewater up to the standard. Using the treatment method and system of the present invention, the one-time investment is low and the operation is easy. Simple, low production and treatment costs, and an environmentally friendly green and environmentally friendly treatment process for steel wastewater

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