A high-efficiency industrial wastewater terminal water arsenic removal equipment

Abstract

The invention relates to effective industrial wastewater end-water arsenic-removing equipment. The equipment mainly comprises a reaction tank, a fractional precipitation tank, a filter and a pH regulating tank. According to the equipment, the collection rate of heavy metals in wastewater can be greatly increased, the defect that the wastewater treated by a chemical method cannot reach the standard can be overcome, the effluent quality can be greatly improved, and the water quality can be lower than the limiting value specified in the Emission Standard of Pollutants for Copper, Nickel, Cobalt Industry (GB25467-2010); furthermore, the intermediate precipitation tank is changed into a fractional precipitation tank by means of process improvement, the precipitation effect of an intermediate water tank can be improved, the filter equipment can be simplified, and the production cost can be reduced.

Description

technical field [0001] The invention relates to a device for removing arsenic from industrial waste water, in particular to a device for removing arsenic from end water of industrial waste water with high efficiency. Background technique [0002] Arsenic and its compounds are recognized toxic substances and carcinogens. Its toxicity is related to their chemical properties and valence. Pentavalent arsenic will be reduced to trivalent arsenic in the human body, and the toxicity of trivalent arsenic is about 60 times higher than that of pentavalent arsenic. Arsenic has an obvious accumulation in the human body. Even if the human body ingests a low amount of arsenic, arsenic poisoning may still occur after one, two, or even ten years. Therefore, arsenic-containing wastewater must be discharged after reaching Only after the standard can it be discharged. However, with the rapid development of the economy and the increase of industrial and agricultural production intensity, mor...

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Problems solved by technology

[0003] (1) The treatment cost is high; if the wastewater mainly contains trivalent arsenic, the treatment process needs to add an additional oxidant to oxidize the low-priced arsenic to high-priced arsenic to effectively remove it, which will undoubtedly increase the cost of the treatment process. In the traditional process, usually It is necessary to add heavy metal trapping agent for heavy metal trapping (such as DTCR) and coagulant (such as PAC), but the heavy metal trapping agent itself is relatively expensive, which also makes the production cost high. In addition, in the traditional process, it is necessary to use Membrane filtration and other filtration equipment complete the final separation of slag water, which is also one of the reasons for the high cost;

[0004] (2) The treatment of arsenic is not up to standard; the removal of arsenic by the existing process is unstable, the arsenic content in the treated external drainage is often high, and at the same time contains a large amount of heavy metal ions, the treated external drainage cannot fully meet the discharge standards ;

[0005] (3) The amount of sediment is large, and the cost of transportation, storage and treatment is high;

[0006] (4) A continuous treatment method from removing arsenic to recovering arsenic has not been established, and arsenic has not been recycled

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