Method for treating mercury-containing wastewater with three-section continuous process

A waste water and process technology, applied in chemical instruments and methods, adsorption water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of poor treatment effect of mercury-containing waste water and environmental pollution, and achieve small investment and reduced production Simple and reasonable cost and process
CN102010086AActive Publication Date: 2011-04-13TIANNENG CHEM
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TIANNENG CHEM
Publication Date
2011-04-13

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Abstract

The invention relates to a method for treating mercury-containing wastewater in polyvinyl chloride (PVC) resin production, comprising the following steps: regulating the pH value of the mercury-containing wastewater to be 9-11, and pumping the mercury-containing wastewater into a reaction tank by a pump, and adding sinking agent with the mass concentration of 0.5-0.6 into the reaction tank for full reaction at the meantime, wherein the sinking agent is a Na2S solution, and the mass concentration ratio of the Hg and Na2S of the sinking agent is equal to (1:5)-(1:20); and then adding inorganic coagulant with the mass concentration of 0.01-0.03, naturally precipitating the generated HgS flocculent precipitate, filtering to obtain the supernate which reaches emission standard, and transmitting the precipitated HgS flocculent precipitate to a sludge concentration tank. By utilizing the method in the invention, the problem of environment pollution caused by poor treatment effect on high-concentration mercury-containing wastewater produced in the polrvinyl chloride (PVC) resin industry is solved. The method has the advantage of simple and reasonable process, and the like, is easy to implement, can be widely applied to the treatment of mercury-containing wastewater and is especially suitable for treatment of the mercury-containing wastewater in the polrvinyl chloride (PVC) resin production.
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Description

Technical field:

[0001] The invention relates to a method for advanced treatment of industrial mercury-containing wastewater, in particular to a method for treating mercury-containing wastewater in polyvinyl chloride resin production. Background technique:

[0002] Polyvinyl chloride is one of the five general-purpose plastics. It is widely used in important fields such as industry, agriculture, national defense, and chemical building materials. Its commonly used production methods mainly include ethylene oxychlorination and calcium carbide acetylene. With the increasing maturity of the calcium carbide process technology, the production of calcium carbide polyvinyl chloride accounts for 63.4% of the total production of polyvinyl chloride in my country (by the end of 2009), but mercury pollution will be generated in its production, which is manifested in: the production process of calcium carbide polyvinyl chloride The whereabouts of mercury in China are mainly waste mercury ca...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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