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Heavy metal settling agent for treating mercury-containing wastewater

A heavy metal and sedimentation agent technology, applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Removal effect, easy separation effect

Active Publication Date: 2013-06-12
XINJIANG TIANYE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problem caused by Na in the prior art 2 The treatment effect caused by mercury removal is not good, and the sediment is difficult to separate after treatment, so as to provide a method for treating mercury-containing wastewater with good effect, easy separation of sediment after treatment, and simple process for treating mercury-containing wastewater in polyvinyl chloride production Heavy metal sedimentation agent, the heavy metal sedimentation agent can effectively remove mercury contained in water, especially for the treatment of high-concentration mercury-containing wastewater, and will not cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The present invention handles the mercury-containing waste water produced in the polyvinyl chloride resin industry produced by the calcium carbide method. Before the treatment, the Hg content is 12.6312mg / l, the pH value is adjusted between 8-10, and the Na 2 S, ferric sulfate, polyacrylamide, and water are mixed evenly in a certain proportion, and the mass concentration ratio of Hg:heavy metal sedimentation agent is added to the treated water to be 1:15, and fully stirred to make the Hg in the treated water and the generated HgS precipitate, HgS precipitation and unreacted Na 2 S is simultaneously formed by ferrous sulfate in water to form Fe(OH) 2 and Fe(OH) 3 The colloid is adsorbed, and under the action of the coagulant polyacrylamide, the tiny HgS suspended particles are adsorbed into flocculent precipitates and precipitated, and the obtained materials are filtered and adsorbed to separate the HgS flocculent precipitates from the water to be treated. Qualified aq...

Embodiment 2

[0012] The present invention handles the mercury-containing waste water produced in the polyvinyl chloride resin industry produced by the calcium carbide method. Mix evenly, add Hg to the water to be treated: the mass concentration ratio of heavy metal sedimentation agent is 1:11, stir well, make the Hg and HgS in the water to be treated precipitate, and suspend the tiny HgS under the action of alum and polyacrylamide The particles are adsorbed into flocculent precipitates and precipitated, and the obtained material is filtered and adsorbed to separate the HgS flocculent precipitates from the treated water to obtain a qualified aqueous solution. According to the GB7468-87 standard, the cold atomic absorption method is used to measure with the F732-V skilled mercury detector, and the mercury content of the treated aqueous solution is measured to be 0.0034mg / l, which meets the national emission standard of less than 0.005mg / l.

Embodiment 3

[0014] The present invention handles the mercury-containing waste water produced in the polyvinyl chloride resin industry produced by the calcium carbide method. Before the treatment, the Hg content is 2.1402mg / l, the pH value is adjusted between 8-10, and the Na 2 S, ferric sulfate, polypropylene methyl ether, sodium hypochlorite, water mix uniformly in a certain proportion, add Hg to the water to be treated: the mass concentration ratio of heavy metal sedimentation agent is 1: 8, fully stir, make the Hg in the water to be treated and Generate HgS precipitate, HgS precipitate and unreacted Na 2 S is simultaneously formed by ferrous sulfate in water to form Fe(OH) 2 and Fe(OH) 3 The colloid is adsorbed, and under the action of the coagulant polyacrylamide, the tiny HgS suspended particles are adsorbed into flocculent precipitates and precipitated. The obtained materials are filtered and adsorbed to separate the HgS flocculents from the treated water, and the treated water is ...

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Abstract

The invention relates to a heavy metal settling agent for treating mercury-containing wastewater. The technical scheme of the invention comprises the following steps: adding the heavy metal settling agent formed by mixing 20-60 parts of reactant Na2S, 10-20 parts of flocculating agent Fe3<+>, 1-20 parts of coagulant aid polyacrylamide and 10-40 parts of water into the mercury-containing wastewater; adding Hg and the heavy metal settling agent into the treated water according to the mass concentration ratio of 1:5-1:20 to enable the Hg in the treated water to react to generate HgS precipitates; adsorbing micro HgS suspended particles into flocculent precipitates for precipitating under the action of the flocculating agent and the coagulant aid; and filtering and adsorbing the obtained materials to enable the HgS flocculent precipitates to be separated from the treated water to obtain the qualified water solution. The invention has better effect on removing high-concentration mercury-containing wastewater and low-concentration mercury-containing wastewater, the precipitates after treatment can be separated easily and can not cause secondary pollution, and the invention especially can achieve the effect on removing more than 95% of high-concentration mercury-containing wastewater.

Description

technical field [0001] The invention relates to a heavy metal sedimentation agent for treating mercury-containing wastewater, in particular to a heavy metal sedimentation agent suitable for treating mercury-containing wastewater in polyvinyl chloride production. Background technique [0002] At present, in the production of calcium carbide polyvinyl chloride, a large amount of mercury-containing industrial wastewater will be produced due to the use of mercury chloride as a catalyst. Therefore, how to deal with the generated mercury-containing industrial wastewater is a major problem faced by calcium carbide polyvinyl chloride production enterprises. . In Chinese patent 200510031347.3, a kind of Na is added to the treated water in equimolar ratio 2 S makes it generate HgS and adds flocculant to precipitate to achieve the purpose of treatment. But there are following shortcoming: the one, have used single sedimentation agent Na 2 S, after one treatment according to this met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F1/62
Inventor 吴彬刘中海张永龙张红雷王敏郭建陆俊裴建伟马银山
Owner XINJIANG TIANYE GRP