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Method for recovering surfactant and heavy metal ions in micellar-enhanced ultrafiltration (MEUF) concentrate

A technology of surfactants and heavy metal ions, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of difficult separation of mixed sediments, far less than the reuse of micelles, and destruction of micelles molecules , to achieve the effect of saving processing procedures, simple process and good effect

Inactive Publication Date: 2015-02-04
LANZHOU JIAOTONG UNIV
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Problems solved by technology

However, the separation of the mixed precipitates of heavy metals and surfactants produced by these methods is difficult, the recovery rate is low, and the micelles are damaged to a certain extent. The reuse of the recovered micelles is far less than the effect of the first time.

Method used

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  • Method for recovering surfactant and heavy metal ions in micellar-enhanced ultrafiltration (MEUF) concentrate
  • Method for recovering surfactant and heavy metal ions in micellar-enhanced ultrafiltration (MEUF) concentrate
  • Method for recovering surfactant and heavy metal ions in micellar-enhanced ultrafiltration (MEUF) concentrate

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Embodiment 1

[0021] Simulate 3L concentrate wastewater to make Cd 2+ The concentration of sodium dodecylbenzenesulfonate (SDBS) is 30mg / L, and the concentration of sodium dodecylbenzenesulfonate (SDBS) is 600mg / L (1.5CMC). 2+ Adsorb on the SDBS micelles, then add a chelating agent, adjust the pH value, stir evenly and let it stand for 3 hours, then perform ultrafiltration. SDBS and CDs 2+ concentration. Among them, when the chelating agent is recovered, different amounts of ethylenediaminetetraacetic acid (EDTA) are added to make it react with Cd 2+ The molar concentration ratio δ is 0.2, 0.5, 0.8, 1, 2, 4, 6, 8, 10 respectively, and the effect of δ on SDBS and Cd 2+ The impact of recovery, select the best δ value, then configure the feed solution according to the best δ value, use 3mol / L HNO 3 Or 3mol / L NaOH solution to adjust the pH value of its feed solution to 2.5, 3, 3.5, 4, 5, 6, 8, 10, when the pH value is not controlled, it is 3.57, and the analysis of the pH value on SDBS and ...

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Abstract

The invention relates to a method for recovering a surfactant and heavy metal ions in a micellar-enhanced ultrafiltration (MEUF) concentrate, which comprises the following steps: by using the concentrate generated in the heavy metal wastewater MEUF treatment process as a feed solution, standing; and adding a chelator, regulating the pH value with acid or alkali, controlling the mole ratio of the chelator to the heavy metal ions, stirring uniformly, standing, and carrying out ultrafiltration. The method comprehensively considers the recovery rate of the heavy metal ions and SDBS (sodium dodecyl benzene sulfonate); and under the optimum conditions of Delta=2 and pH=3.57, the Cd<2+> recovery rate can reach 65.2%, and the SDBS recovery rate can reach 5.1%. The method can obviously enhance the surfactant and heavy metal ion recovery efficiency of the MEUF concentrate and lower the recovery cost and the secondary environmental pollution, and has favorable socioeconomic benefit and environmental benefit.

Description

technical field [0001] The invention relates to a method for recovering surfactants and heavy metal ions in concentrated liquid, in particular to a method for recovering surfactants and heavy metal ions in micellar enhanced ultrafiltration (MEUF) concentrated liquid. Background technique [0002] Micelle-enhanced ultrafiltration (MEUF) is a new method for treating low-concentration metal ions based on the unique amphiphilic molecular structure characteristics of surfactants and the combination of surfactants and ultrafiltration technology. After the heavy metal ion wastewater is treated by MEUF, it is divided into permeate and concentrate. Among them, the permeate only contains a very small amount of metal ions that are not adsorbed or compatibilized by micelles and a certain concentration of surfactant monomers, which can be directly discharged or recycled. The concentrated solution contains high concentrations of heavy metal ions and surfactants, which need to be further ...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/54C02F1/56
CPCC02F1/62C02F1/54C02F1/56C02F2101/20
Inventor 赵保卫李瑞瑞许仁智
Owner LANZHOU JIAOTONG UNIV
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