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A treatment method and treatment device for discharge of cold-rolled dilute alkali wastewater up to standard
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A technology of dilute alkali wastewater and its treatment method, which is applied in the field of water treatment and can solve problems such as environmental pollution of cold-rolled dilute alkali wastewater
Active Publication Date: 2020-09-25
BAOSHAN IRON & STEEL CO LTD
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[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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Embodiment 1
[0049] A standard treatment process system for cold-rolled dilute alkali wastewater, water inlet pump, PH rough adjustment tank, adjustment tank water pump, pH fine adjustment tank, biochemical tank water pump, aerobic biochemical tank, multi-faceted hollow ball packing, inclined plate sedimentation tank, reactor Lifting pump, ultraviolet photoreactor, ultraviolet light source, ultraviolet light active catalyst, adsorption tower lifting pump, adsorption tower, pitch-based mesophase activated carbon, water outlet pump.
[0050] The water quality pH of the cold rolling dilute alkali wastewater is 11.6, the total suspended solids is 415 mg / L, and the COD is 2950 mg / L.
[0051] The cold rolling dilute alkali wastewater enters the pH rough adjustment tank through the water inlet pump. The PH of the influent water is 11.6, and the concentration of 8% calcium hydroxide is added to the PH rough adjustment tank. The residence time of the wastewater in the pH rough adjustment tank is 9 ...
Embodiment 2
[0063] A standard treatment process system for cold-rolled dilute alkali wastewater, water inlet pump, PH rough adjustment tank, adjustment tank water pump, pH fine adjustment tank, biochemical tank water pump, aerobic biochemical tank, multi-faceted hollow ball packing, inclined plate sedimentation tank, reactor Lifting pump, ultraviolet photoreactor, ultraviolet light source, ultraviolet light active catalyst, adsorption tower lifting pump, adsorption tower, pitch-based mesophase activated carbon, water outlet pump.
[0064] The water quality pH of the cold rolling dilute alkali wastewater is 10.7, the total suspended solids is 339 mg / L, and the COD is 2330 mg / L.
[0065] The cold rolling dilute alkali wastewater enters the pH rough adjustment tank through the water inlet pump. The PH of the influent water is 10.7, and calcium hydroxide with a concentration of 6% is added to the rough pH adjustment tank. The residence time of the wastewater in the rough pH adjustment tank is...
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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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