Method for advanced treatment of mercury-containing wastewater

Abstract

A method for the advanced treatment of mercury-containing wastewater comprises the following steps: collecting mercury-containing wastewater, adjusting the pH value, chemically settling, carrying out advanced treatment, carrying out sludge concentration, carrying out solid-liquid separation, collecting the separated liquid, and carrying out bagging sealing collection of the separated solid. The method solves a problem of environmental pollution caused by bad treatment effect of mercury-containing wastewater generated in the production of polyvinyl chloride resin through a calcium carbide technology, and has the advantages of thorough treatment, small pollution, reasonable and simple process, continuous and rapid treatment, easy implementation and fast effectiveness. The method allows the mercury-containing wastewater to be thoroughly treated and have small pollution, and an advanced treatment material used in a system has a long service life and a low price, and can be recycled, so the method has the advantages of small investment and easy implementation; and the process is simple and reasonable, and can effectively realize energy saving, emission reduction and environmental protection.

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 resource characteristics of rich coal, poor oil and little gas in China, calcium carbide polyvinyl chloride has developed into the mainstream process of polyvinyl chloride industry. Due to the use of mercuric chloride as a catalyst, the loss of mercury is inevitable, and the traditional calcium carbide polyvinyl chloride production process has extremely serious pollution to the environment. Although the hazards of mercury-containing wastewater have long been recognized by the people, and many methods have been developed for treatment, most of the treated mercury-containing wastewater cannot meet the standards. [0003] Chinese patent CN 102010086A discloses "a method for treating mercury-containing wastewater by a three-stage c...

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Problems solved by technology

[0004] The invention solves the problem that the mercury-containing wastewater produced by the current calcium carbide method to produce polyvinyl chloride resin has a poor treatment effect and causes environmental pollution, and further provides a Hg 2+ A method for advanced treatment of mercury-containing wastewater with thorough treatment, low pollution, simple and reasonable process, continuous and rapid treatment, easy implementation, and quick results

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