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Heavy metal settling agent for treating mercury-containing wastewater

A heavy metal and sedimentation agent technology, which is applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of difficult separation of sediments and poor treatment effect, and achieve good results Removal effect, easy separation effect

Active Publication Date: 2011-04-06
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

[0011] The invention treats the mercury-containing wastewater produced in the industry of producing polyvinyl chloride resin by the calcium carbide method. The Hg content before the treatment is 12.6312mg / l, the pH value is adjusted between 8-10, and the Na 2 S, iron sulfate, polyacrylamide, and water are mixed uniformly in a certain ratio. Add Hg: heavy metal settling agent to the water to be treated with a mass concentration ratio of 1:15. Stir fully to make Hg in the water to be treated and generate HgS precipitate. HgS precipitation and unreacted Na 2 S is also formed by ferrous sulfate in water to form Fe(OH) 2 And Fe(OH) 3 The colloid is adsorbed, and the tiny HgS suspended particles are adsorbed into flocculent sediment under the action of the coagulant polyacrylamide, and the resulting material is filtered and adsorbed to separate the HgS flocculent sediment from the water to be treated, and then get the treatment Qualified aqueous solution. According to the GB7468-87 st...

Embodiment 2

[0013] The present invention treats the mercury-containing wastewater produced in the production of polyvinyl chloride resin by calcium carbide method. The Hg content before treatment is 8.1024 mg / l, the PH value is adjusted between 8-10, and NaHS, alum, polyacrylamide, and water are adjusted to a certain amount. Mix the ratio uniformly, add Hg: heavy metal settling agent to the water to be treated with a mass concentration ratio of 1:11, fully stir to make the Hg in the water to be treated and the generated HgS precipitate, and suspend the tiny HgS under the action of alum and polyacrylamide The particles are adsorbed into flocculent sediments and settle down, and the obtained materials are filtered and adsorbed to separate the HgS flocculent sediments from the treated water to obtain a qualified aqueous solution. According to the GB7468-87 standard, cold atomic absorption method was used to measure the mercury content of the F732-V technical mercury meter. The mercury content ...

Embodiment 3

[0015] The invention treats the mercury-containing wastewater produced in the industry of producing polyvinyl chloride resin by the calcium carbide method. The Hg content before treatment is 2.1402 mg / l, the pH value is adjusted between 8-10, and the Na 2 S, iron sulfate, polypropylene methyl ether, sodium hypochlorite, and water are mixed uniformly in a certain proportion, and the mass concentration ratio of Hg: heavy metal settling agent is 1:8 in the water to be treated. Stir fully to make the Hg in the water to be treated and HgS precipitation, HgS precipitation and Na that did not participate in the reaction 2 S is also formed by ferrous sulfate in water to form Fe(OH) 2 And Fe(OH) 3 The colloid is adsorbed, and the tiny HgS suspended particles are adsorbed into flocculent sediment under the action of the coagulant polyacrylamide, and the obtained material is filtered and adsorbed to separate the HgS flocculent sediment from the treated water, and the treatment is qualified. ...

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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 settling agent for treating mercury-containing wastewater, particularly a heavy metal settling agent suitable for treating mercury-containing wastewater in the production of polyvinyl chloride. Background technique [0002] At present, in the production of PVC by calcium carbide method, a large amount of mercury-containing industrial wastewater is generated due to the use of mercury chloride as a catalyst. Therefore, how to treat the generated industrial wastewater containing mercury is a major problem faced by the calcium carbide method PVC production enterprises. . The Chinese patent 200510031347.3 provides a method of adding Na in equal molar ratio to the treated water. 2 S makes it generate HgS and adds flocculant precipitation to achieve the purpose of treatment. But there are the following shortcomings: First, a single settling agent Na is used 2 S. After one treatment according to this method, it can only reach...

Claims

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Application Information

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Patent Type & Authority Applications(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
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