Treatment method of leachate wastewater of electrolytic aluminum slag field

Abstract

The invention provides a treatment method of leachate wastewater of an electrolytic aluminum slag field. The treatment method comprises the following specific steps: collecting wastewater into a collection and regulation tank, pumping the wastewater into a defluorination reaction tank, enabling supernatant to flow into a coagulation reaction tank, carrying out coagulation reaction, pumping leachate of the coagulation reaction tank into an efficient sedimentation tank, carrying out solid-liquid separation, enabling separated supernatant to automatically flow into a neutralization and regulationtank, discharging separated sludge into a sludge collection tank at regular intervals, pumping leachate with regulated pH into a biochemical reaction tank, enabling supernatant to enter a physical adsorption tank, discharging sludge into the sludge collection tank at regular intervals, adsorbing, then enabling the sludge to enter a monitoring tank, and discharging after the sludge reaches the standard through detection. The treatment method provided by the invention creatively adopts a combined process of defluorination reaction, coagulation reaction, solid-liquid separation, neutralization biochemical reaction and physical adsorption to treat the leachate wastewater of the electrolytic aluminum slag field and has the advantages of low cost, short process, stable water production, easiness in management and operation and easiness in popularization and application.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method for leachate wastewater of an electrolytic aluminum slag field. Background technique [0002] Aluminum oxide, fluoride salt, and cryolite are used as raw materials in the production process of electrolytic aluminum. The slag field is mainly composed of overhaul waste slag and waste slag generated during production. High (can reach 10000mg / L), pH reaches 13, ammonia nitrogen reaches 400mg / L, CODcr reaches 1800mg / L. Once infiltrated into the ground, it will seriously pollute nearby groundwater and surface water resources, and have a very serious impact on nearby watersheds and residents' lives. According to my country's "Aluminum Industry Pollutant Discharge Standard" GB25465-2010 Table 2 discharge standard, if it is discharged directly, the PH should be controlled at 6-9, the suspended matter should be controlled within 30mg / L, and the ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that a large amount of inorganic acid will be consumed during neutralization, the cost is high, and other pollution indicators cannot be treated, and there are still environmental risks

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