Method for processing hexavalent chromium contained wastewater with ion exchange resin

A technology of ion exchange resin and hexavalent chromium, which is applied in the field of ion exchange resin to treat wastewater containing hexavalent chromium, which can solve the problems affecting the ion exchange performance of the resin, achieve clear product structure, realize governance and resource recovery, and be environmentally friendly in the preparation process Effect

Inactive Publication Date: 2008-05-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the synthesis of PS-CH 2 In the reaction of -Cl, raw materials such as strong carcinogenic chloromethyl ether or dichloromethyl ether (Roland L.D., Millar J.R., Chemistry & Industry, 1993, 4 (1): 10) are usually used; in addition, in the chloromethylation reaction, also Accompanied by the multi-substitution and secondary crosslinking of chloromethyl groups, it will affect the ion exchange performance of the resin (Barrett J., Heights C., et al., Method of Preparing Anion ExchangeResins with Sulfuryl Chloride[P], US 3,812,061,1974 )

Method used

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  • Method for processing hexavalent chromium contained wastewater with ion exchange resin
  • Method for processing hexavalent chromium contained wastewater with ion exchange resin
  • Method for processing hexavalent chromium contained wastewater with ion exchange resin

Examples

Experimental program
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Effect test

Embodiment 1

[0017] 10mLPS-Acyl-NR 2 Installed in a glass column (Φ10×200mm).

[0018] Take 650mL of pretreated wastewater with a pH of 5 and a hexavalent chromium concentration of 3500mg / L, and pass through the resin bed at a flow rate of 6BV / h. Reuse, 565mL after effluent needs further treatment.

[0019] Using 500mL aqueous sodium hydroxide solution with a mass concentration of 5% as a desorbent, regenerate and recover hexavalent chromium at a flow rate of 3BV / h at 25°C, and the recovery rate reaches 96%.

Embodiment 2

[0021] 10mL PS-Acyl-NR 2 Installed in a glass column (Φ10×200mm).

[0022] Take 650mL of waste water with a pH of 5 and a hexavalent chromium concentration of 3500mg / L, and pass through the resin bed at a flow rate of 3BV / h. The last 565mL needs further processing.

[0023] Using 500mL aqueous potassium hydroxide solution with a mass concentration of 5% as a desorbent, regenerate and recover hexavalent chromium at a flow rate of 3BV / h at 25°C, and the recovery rate reaches 90%.

Embodiment 3

[0025] 10mL PS-Acyl-NR 2 Installed in a glass column (Φ10×200mm).

[0026] Take 650mL of waste water with a pH of 5 and a hexavalent chromium concentration of 3500mg / L, and pass through the resin bed at a flow rate of 3BV / h. The last 565mL needs further processing.

[0027] Using 700mL ammonia solution with a mass concentration of 10% as a desorbent, regenerate and recover hexavalent chromium at a flow rate of 12BV / h at 25°C, and the recovery rate reaches 89%.

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Abstract

The invention relates to a method of treating sexavalent chrome waste water by ion exchange resin, which belongs to the technology of treating the sewage with chrome. The resin used in the method is the polystyrene acyl amidocyanogen weak-base ion-exchange resin. Treating waste water containing chrome by use of the resin includes the following steps that: waste water containing chrome is pretreated to remove the infusible impurities; and then, pretreated waste water passes through the exchange post filled with the ion exchange resin in a flow rate ranging from 3BV/h to 6BV/h in room temperature; the absorbed resin is reproduced by use of the alkali solution with mass fraction ranging from 2 percent to 10 percent, and sexavalent chrome is recycled. After being treated by the invention, the concentration of the sexavalent chrome in waste water drops from 3500mg/L to 0.5mg/L, which can be discharged in comply with the standard; by reproducing, the recovery rate of the sexavalent chrome reaches up to 90 percent to 95 percent, thereby realizing recovering and comprehensively utilizing the resources while treating the waste water.

Description

technical field [0001] The invention relates to a method for treating waste water containing hexavalent chromium with an ion exchange resin, which belongs to the treatment technology of waste water containing hexavalent chromium. Background technique [0002] In recent years, with the rapid development of the national economy, especially the rapid development of the electroplating industry, metallurgical industry, mechanical processing industry and electronic industry, the content of heavy metals in the environment has been continuously increased, and most of the various types of production wastewater have not met the discharge standards. Directly entering the water body has caused great harm to surface water sources and groundwater sources, and the quality of water sources has also declined sharply. Due to the extensive use of chromate in the electroplating industry, such as chrome plating, passivation of zinc plating, etc., wastewater containing hexavalent chromium has bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F101/22
Inventor 刘晓宁魏荣卿李响
Owner NANJING UNIV OF TECH
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