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Method for simultaneous removal and recovery of heavy metal ions and organic acid by using chelating resin

A technology of heavy metal ions and chelating resins, applied in chemical instruments and methods, ion exchange water/sewage treatment, water/sewage treatment, etc., can solve the problems of inability to recycle resources, high cost and low efficiency of compound polluted wastewater, and achieve Significant economic benefits, broad application prospects, and simple operation

Active Publication Date: 2014-11-05
南京华创环境技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects of high cost, low efficiency, and inability to recycle resources in the prior art for treating heavy metal and organic acid composite polluted wastewater, the present invention provides a method for simultaneously removing and recovering heavy metal ions and organic acids using chelating resins. The chelating resin adsorbs and removes heavy metal ions, organic acids and their complexes at the same time, reduces the concentration of heavy metals and organic acid pollutants, and then concentrates and recovers high-concentration heavy metals and organic acid resources through the desorption process, and regenerates and recycles the chelating resin

Method used

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  • Method for simultaneous removal and recovery of heavy metal ions and organic acid by using chelating resin
  • Method for simultaneous removal and recovery of heavy metal ions and organic acid by using chelating resin
  • Method for simultaneous removal and recovery of heavy metal ions and organic acid by using chelating resin

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Effect test

Embodiment 1

[0026] Put 2.0g (8.2mL wet volume) of resin A into a jacketed glass adsorption column (Φ32×360mm), keep the column temperature at 30°C, mix copper and citric acid waste water (the initial concentration of copper is 50mg / L, The initial concentration of citric acid is 100mg / L), and the pH is adjusted to 2.5, and is pumped into the adsorption column with a flow rate of 1BV / h, and the processing capacity is 100BV. The chelating resin after adsorption is desorbed and regenerated with 2% HCl solution by weight percentage, the desorption temperature is 5° C., and the flow rate is 1 BV / h. The desorbed and regenerated resin is washed to neutral with water and can be reused.

Embodiment 2

[0028] Put 2.0g (8.2mL wet volume) of resin A into a jacketed glass adsorption column (Φ32×360mm), keep the column temperature at 30°C, mix copper and citric acid waste water (the initial concentration of copper is 50mg / L, The initial concentration of citric acid is 100mg / L), and the pH is adjusted to 4.5, and is pumped into the adsorption column with a flow rate of 1BV / h, and the processing capacity is 100BV. The chelating resin after adsorption is desorbed and regenerated with 10% HCl solution by weight percentage, the desorption temperature is 30°C, and the flow rate is 10BV / h. After the desorption is completed, the resin is washed with water to neutrality and can be reused.

Embodiment 3

[0030] Put 2.0g (8.2mL wet volume) of resin A into a jacketed glass adsorption column (Φ32×360mm), keep the column temperature at 30°C, mix copper and citric acid waste water (the initial concentration of copper is 50mg / L, The initial concentration of citric acid is 100mg / L), and the pH is adjusted to 7.5, and is pumped into the adsorption column with a flow rate of 1BV / h, and the processing capacity is 100BV. The chelating resin after adsorption is desorbed and regenerated with 30% HCl solution by weight percentage, the desorption temperature is 50°C, and the flow rate is 20BV / h. After the desorption is completed, the resin is washed with water to neutrality and can be reused.

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Abstract

The invention discloses a method for simultaneous removal and recovery of heavy metal ions and organic acid by using s chelating resin, belonging to the field of resource treatment of heavy metal and organic acid composite wastewater. The invention comprises the following steps: (1) regulating the pH value of composite wastewater containing heavy metal ions and organic acid, pumping the wastewater into an adsorption columns packed with chelating resin, wherein metal removal rate is greater than 56%, the removal rate of organic acid is more than 58%, and the chelating resin is chelating resin containing primary amine groups; (2) conducting desorption on the chelating resin from the step (1) by a conventional inorganic acid desorption agent, and recovering a mixed solution of high concentration heavy metals and organic acid; stopping the desorption when no heavy metal or organic acid is detected in outlet water; and washing the resin after desorption to a neutral state for reuse. The invention is applicable to the simultaneous great reduction of concentrations of heavy metals and organic acid pollution and recovery of high concentration heavy metal ion and organic acid resources, so as to realize harmless treatment and resource recycling of the composite pollutants.

Description

technical field [0001] The invention relates to a method for simultaneously removing and reclaiming heavy metal ions and organic acids using chelating resins, specifically, using chelating resins to efficiently remove heavy metal ions and organic acid pollutants in wastewater at the same time, and then recover high-concentration Heavy metal and organic acid solution to achieve standard treatment of heavy metals in complex wastewater. Background technique [0002] Heavy metal ions and organic acid complex pollutants often coexist in the tail water of electroplating, tanning, chemical and other industrial wastewater, landfill leachate, industrial park comprehensive wastewater and biochemical treatment of heavy metal organic wastewater. Among them, the concentration of heavy metal poisons controlled by the state is as high as 100-1000mg / L. Due to the coexistence of various organic acids, heavy metal ions will form a variety of complex forms, resulting in conventional water trea...

Claims

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Application Information

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IPC IPC(8): C02F1/42C02F1/58C02F1/62
Inventor 刘福强凌晨徐超韦蒙蒙陈泰鹏陈达李爱民
Owner 南京华创环境技术研究院有限公司
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