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Method for removing heavy metals in water by collaboration of dialysis through ion exchange membrane and chemical precipitation

An ion-exchange membrane and chemical precipitation technology is applied in the field of ion-exchange membrane dialysis and chemical precipitation to remove heavy metals in water. consumption reduction effect

Inactive Publication Date: 2012-07-11
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biological method is complicated to operate and the cumbersome biological culture procedures limit its application

Method used

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  • Method for removing heavy metals in water by collaboration of dialysis through ion exchange membrane and chemical precipitation
  • Method for removing heavy metals in water by collaboration of dialysis through ion exchange membrane and chemical precipitation
  • Method for removing heavy metals in water by collaboration of dialysis through ion exchange membrane and chemical precipitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] established as figure 1 In the reaction system shown, the ion exchange membrane adopts GEFC-107 (Beijing Jinneng), the volume of the raw water chamber is 300ml, and the volume of the reaction chamber is 400ml. The raw water chamber flows into the simulated polluted water sample containing 20 mg / L copper ions, and the reaction chamber is added with a sodium hydroxide solution with a concentration of 1 mol / L. The copper ions enter the reaction chamber through the ion exchange membrane and then form copper hydroxide precipitation, and react for 5 hours. , The removal rate of copper ions in the raw water chamber reaches 85%.

Embodiment 2

[0021] The reactor is as in Example 1, the simulated polluted water sample containing 50 mg / L copper ions flows into the raw water chamber, and the reaction chamber is added with a sodium hydroxide solution with a concentration of 2 mol / L, and the copper ions enter the reaction chamber through the ion exchange membrane and then form hydrogen Copper oxide precipitates, and every 2 hours of reaction, the sediment at the bottom of the reaction chamber is pumped out and the ion exchange membrane is cleaned. After 6 hours of reaction, the removal rate of copper ions in the raw water chamber reaches 90%.

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Abstract

The invention provides a method for removing heavy metal ions in water. The technical principle is as follows: pollutants, namely the heavy metal ions in the water are permeated from a high-concentration side to a low-concentration side by utilizing the exchange role of the ion exchange membrane, and an alkaline or carbonate or sulfide salt solution is applied to the low-concentration side, so that the heavy metal ions can form an insoluble hydroxide or carbonate or sulfide salt for being precipitated and being further removed. According to the method disclosed by the invention, the processes of membrane separation and chemical precipitation are organically linked together, so that membrane dialysis and precipitation removal are synchronously performed. Compared with the traditional method, the method disclosed by the invention has the advantages that a reactor has a simple structure, the operation is easy and the application prospect is broad.

Description

technical field [0001] The invention relates to a method for removing heavy metals in water. The technical principle is to use the exchange effect of ion exchange membranes to make heavy metal ions of pollutants in water permeate from the side with high concentration to the side with low concentration, and the side with low concentration is applied Alkaline or carbonate or sulfide solution, so that heavy metal ions form insoluble hydroxides or carbonates or sulfides can be precipitated and removed. technical background [0002] Heavy metal ions are a common pollutant in water. In recent years, especially due to the accelerated development of industrialization, the discharge of heavy metals to nature has greatly increased, resulting in serious water pollution. Heavy metal ions such as copper, zinc, lead, chromium, nickel, cadmium, and mercury are strictly controlled pollutants. And because heavy metal pollutants cannot be decomposed into harmless substances in the natural e...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F1/52C02F1/62
Inventor 万东锦孙旭镯王宁孙晓峰陈静李波张迎明刘永德
Owner HENAN UNIVERSITY OF TECHNOLOGY
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