Method for treating low-concentration mercury-containing wastewater

Abstract

The invention relates to a method for treating low-concentration mercury-containing wastewater, comprising the following steps of: firstly collecting low-concentration mercury-containing wastewater in a mercury-containing waste liquid storage tank, sending into a reduction reactor through a wastewater transfer pump, wherein a filling material in the reduction reactor is metal zinc; performing a reduction reaction between mercury ions in the low-concentration mercury-containing wastewater and the metal zinc; allowing precipitated liquid mercury and reduced wastewater to enter into a cyclone hydraulic separator for liquid-liquid separation; discharging the separated mercury from the bottom of the cyclone hydraulic separator, barreling and dense packaging; allowing a separated supernatant toflow from the top of the cyclone hydraulic separator and discharging after the mercury concentration is less than or equal to 0.5microgram / l. The invention solves the present problem that low-concentration mercury-containing wastewater is difficult to treat so as to pollute the environment. The method provided by the invention has advantages of simple and reasonable process and less investment, is easy to implement, and can be widely applied in the treatment of low-concentration mercury-containing wastewater.

Description

Technical field: [0001] The invention relates to the field of sewage treatment, in particular to a treatment method for low-concentration mercury-containing wastewater. 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 research, and are actually used in engineering ...

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problem that the current low-concentration mercury-containing wastewater is difficult to treat and thus causes environmental pollution, and further provides a low-concentration mercury-containing wastewater that can be treated thoroughly, requires less investment, is simple and reasonable in process, is easy to implement, and has quick results. Treatment methods of mercury-containing wastewater

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