Method for advanced treatment of mercury-containing wastewater

Abstract

The invention relates to a method for treating mercury-containing wastewater. The method comprises the following steps of: collecting the mercury-containing wastewater to a PH regulating reservoir; adjusting the PH value to be 9-11; pumping the mercury-containing wastewater into a reaction tank by a conveying pump; meanwhile, adding a Na2S solution in the reaction tank and fully reacting; adding a flocculating agent F<3+>; naturally precipitating the generated HgS flocculent precipitate; filtering the reacted supernate by a sand filter tank and enabling the filtered mercury-containing wastewater to feed into an advanced treatment device; feeding the precipitated HgS precipitate into a sludge concentrated tank and concentrating the precipitated HgS precipitate; and feeding the concentrated precipitate into a solid-liquid separating device for solid-liquid separation. According to the invention, the problem that pollution to the environment due to poor treatment effect of the mercury-containing wastewater caused by a synthetic work procedure for producing a polyvinyl chloride resin industrial furnace by adopting a current carbide method is solved; the invention has the advantages of simple and reasonable process, easiness for implementation, quick effect and the like; and the method can be widely applied to the treatment of the mercury-containing wastewater and is especially suitable for the advanced treatment of the mercury-containing wastewater in the production process of the polyvinyl chloride resin.

Description

Technical field: [0001] The invention relates to a method for treating mercury-containing wastewater, in particular to a method for treating mercury-containing wastewater in polyvinyl chloride resin production. Background technique: [0002] Due to the wide application of polyvinyl chloride, as well as the abundance of calcium carbide resources in my country and the increasingly mature technology of calcium carbide acetylene process, the calcium carbide process PVC industry has developed rapidly, but it has brought huge economic benefits and serious environmental pollution. problem, due to HgCl 2 As a catalyst, it will inevitably lead to the loss of mercury, and the resulting mercury pollution problem is also becoming more and more serious. Although the hazards of mercury-containing wastewater have long been recognized by people, and many methods have been developed for treatment, most of the treatment data in the literature are the results of laboratory or pilot-scale resea...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem of environmental pollution caused by the poor treatment effect of mercury-containing wastewater produced in the synthetic process of the industrial furnace for producing polyvinyl chloride resin by the calcium carbide method, and further provides a Hg 2+ A method for advanced treatment of mercury-containing wastewater with thorough treatment, low pollution, simple and reasonable process, easy implementation, and quick results

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