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Method for synchronously removing and stepwise recovering sulfoacid dye and heavy metal ion through resin

A technology of heavy metal ions and resins, applied in chemical instruments and methods, ion exchange water/sewage treatment, water pollutants, etc., can solve the problems of inability to recycle valuable resources, high cost, complicated procedures, etc., and achieve no secondary pollution Less pollution, stable performance, and low material cost

Inactive Publication Date: 2014-07-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems in the prior art that the procedures for treating waste water polluted by sulfonic acid dyes and heavy metals are complex, the cost is high, and the valuable resources therein cannot be recycled, the present invention provides a method for simultaneously removing and step-by-step recovery of sulfonic acid dyes and heavy metal ions using resin The method is to use adsorption resin to simultaneously adsorb and remove sulfonic acid dyes and heavy metal ions, reduce the concentration of pollutants, and then recover heavy metal ions and dyes step by step from the adsorbed resin through a combination of desorbents, and regenerate the adsorption resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method utilizing resin to simultaneously remove and recover sulfonic acid dyes and heavy metal ions step by step, the steps are:

[0029] (1) Simultaneous adsorption: put 10 mL of adsorption resin (NDA-150) into a jacketed glass adsorption column (Φ32×360 mm), keep the column temperature at 30°C, add sulfonic acid dye (acid black 1, CAS : 1064-48-8) and copper salt (the initial concentration of the dye is 1000 mg / L, the initial concentration of copper ions is 30 mg / L) to adjust the pH to 5, and the flow rate is 5 BV / h. adsorption column. The processing capacity is 50 BV / batch. The average concentration of dye in the adsorbed water was 190 mg / L, and the average concentration of copper ions was 9.5 mg / L.

[0030] (2) Recovery of heavy metals: keep the column temperature at 30°C, use 15 BV of hydrochloric acid solution (concentration of 4% by mass percentage, the concentration of hydrochloric acid, sulfuric acid and sodium hydroxide in the following examples refers to ...

Embodiment 2

[0033] Same as Example 1, the difference is that NDA-99 is used to replace the adsorption resin NDA-150 in Example 1, and in step (2), 18 BV15% hydrochloric acid solution is used to carry out the first adsorption to the adsorbed resin at 6 BV / h. The column temperature in step (3) was 30°C. Under the same adsorption and desorption operating conditions, the average concentration of dye in the adsorbed water was 220 mg / L, and the average concentration of copper ions was 8.2 mg / L. In the first round of desorption, the copper ion desorption rate reached 100%, and the dye was not detected; in the second round of desorption, the dye desorption rate reached 98%.

Embodiment 3

[0035] Same as Example 1, the difference is that the adsorption resin NDA-150 in Example 1 is replaced by XAD-4 produced by U.S. Rohm & Haas Company. Under the same adsorption and desorption operating conditions, the average concentration of the adsorbed water dye is 310 mg / L, the average concentration of copper ions is about 18 mg / L. In the first round of desorption, the copper ion desorption rate reached 100%, and the dye was not detected; in the second round of desorption, the dye desorption rate reached 100%.

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Abstract

The invention discloses a method for simultaneously removing and recovering sulfonic acid dyes and heavy metal ions by using resin, and belongs to the field of resource treatment of dye-heavy metal composite wastewater. The steps of the present invention include: (1) Simultaneous adsorption: adjust the pH value of the composite wastewater containing sulfonic acid dyes and heavy metal ions to between 3-6, and then pump the composite wastewater into an adsorption column filled with adsorption resin; ( 2) Heavy metal recovery: Use conventional inorganic acid desorbents to perform the first round of desorption on the adsorption resin after step (1); stop the first round of desorption after no heavy metals are detected in the effluent; (3) Dye recovery: The second round of desorption of the adsorption resin after desorption in step (2) is carried out by using a conventional inorganic alkali desorption agent, and the fully regenerated resin is washed with water to neutrality and can be reused. The invention can greatly reduce the pollution concentration of sulfonic acid dyes and heavy metals at the same time, and recover high-purity sulfonic acid dyes and heavy metal ions step by step for resource recovery and utilization.

Description

technical field [0001] The invention relates to the field of resource treatment of dye-heavy metal composite wastewater, in particular to a method for simultaneously removing sulfonic acid dyes and heavy metal ions by using an adsorption resin, and then realizing the recovery of heavy metals and dyes step by step. Background technique [0002] Textile printing and dyeing wastewater not only contains high concentrations of dye molecules (mainly sulfonic acid dyes), but also often coexists with considerable amounts of heavy metal ions (such as copper, lead, cadmium, etc.), which are used as dye components or as catalysts in printing and dyeing. Appear. With the development of my country's industrial parks, comprehensive wastewater has appeared frequently. This kind of sulfonic acid dye and heavy metal composite wastewater has the characteristics of large water volume, high chroma, complex composition, high toxicity, and difficult biochemical treatment. Therefore, the dyes an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C22B3/24C02F101/20C02F103/30
CPCY02P10/20
Inventor 刘福强凌晨陈泰鹏龙超孙晓文徐超李爱民
Owner NANJING UNIV
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