Enhancing ultrafiltration treatment method of wastewater containing methylene blue by surfactant

A surfactant, methylene blue technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The problem of high cost is to achieve the effect of automatic operation, easy synthesis of water solubility, and convenient process combination.

Inactive Publication Date: 2011-09-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biological treatment of wastewater containing organic dyes is affected by factors such as pH value, temperature, dye type, etc., coupled with sludge bulking and easy disintegration of aggregates, making the effect of biological treatment unsatisfactory
The operation cost of coagulation method is high, the amount of sludge is large and dehydration is difficult, the applicable pH range is narrow, and the treatment effect on hydrophilic dyes is poor
Oxidation method is costly, and the catalyst cannot be recovered. Commonly used oxidants also have disadvantages such as weak oxidation ability and selective oxidation, and impurities are easily introduced during the treatment process to cause secondary pollution.
The adsorption method is easily affected by suspended solids in water, polymer pollutants, grease, etc., and the amount of adsorbent is large and the cost is high
Membrane separation methods are divided into electrodialysis, reverse osmosis, nanofiltration, ultrafiltration, etc. Among them, electrodialysis, reverse osmosis, and nanofiltration have the advantages of high removal rate, can recover dyes in wastewater, and simple process , but the cost of the membrane used is relatively high, and the operating pressure is high, resulting in high energy consumption of the membrane method, which affects its industrial application
However, due to the large pore size of the membrane, the traditional ultrafiltration method is difficult to remove low-molecular-weight organic pollutants, and the removal efficiency is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take the wastewater to be treated with a methylene blue concentration of 6mg / L, and add 8.0×10 -3 mol of SDS, stirred evenly and left to react for 0.5h. After the reaction was completed, the SDS monomer molecules in the wastewater self-assembled to form SDS micelles solubilized with methylene blue, and then the wastewater after the reaction was sent to the ultrafiltration membrane module by a pump. For ultrafiltration treatment, the ultrafiltration membrane module is a hollow fiber ultrafiltration membrane module. The treated retentate is returned to the waste water inlet tank, the ultrafiltration membrane intercepts and solubilizes the SDS micelles of methylene blue, the methylene blue in the wastewater is removed, and the permeate after ultrafiltration treatment is a colorless solution. The concentrations of methylene blue and SDS in the permeate (ie, effluent) were measured by ultraviolet spectrophotometry, and the results are shown in Table 1.

[0018] Table 1: Par...

Embodiment 2

[0021] Take the wastewater to be treated that contains methylene blue concentration of 6mg / L, add 56×10 -3 mol of SDS, stirred evenly and left to react for 0.5h. After the reaction was completed, the SDS monomer molecules in the wastewater self-assembled to form SDS micelles solubilized with methylene blue, and then the wastewater after the reaction was sent to the ultrafiltration membrane module by a pump. For ultrafiltration treatment, the ultrafiltration membrane module is a hollow fiber ultrafiltration membrane module. The treated retentate is returned to the waste water inlet tank, the ultrafiltration membrane intercepts and solubilizes the SDS micelles of methylene blue, the methylene blue in the wastewater is removed, and the permeate after ultrafiltration treatment is a colorless solution. The concentrations of methylene blue and SDS in the permeate were measured by ultraviolet spectrophotometry, and the results are shown in Table 2.

[0022] Table 2: Parameter compar...

Embodiment 3

[0025] Take the wastewater to be treated with a methylene blue concentration of 6mg / L, and add 8×10 -3 mol of SDS, stirred evenly and left to react for 0.5h. After the reaction was completed, the SDS monomer molecules in the wastewater self-assembled to form SDS micelles solubilized with methylene blue, and then the wastewater after the reaction was sent to the ultrafiltration membrane module by a pump. For ultrafiltration treatment, the ultrafiltration membrane module is a hollow fiber ultrafiltration membrane module. The treated retentate is returned to the waste water inlet tank, the ultrafiltration membrane intercepts and solubilizes the SDS micelles of methylene blue, the methylene blue in the wastewater is removed, and the permeate after ultrafiltration treatment is a colorless solution. The concentrations of methylene blue and SDS in the permeate were determined by ultraviolet spectrophotometry, and the results are shown in Table 3.

[0026] Table 3: Parameter comparis...

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Abstract

The invention discloses an enhancing ultrafiltration treatment method of wastewater containing methylene blue by surfactant, which comprises the following steps: adding lauryl sodium sulfate to the wastewater containing the methylene blue, wherein 6*10-3mol-72*10-3mol of the lauryl sodium sulfate is added to per liter of wastewater; stirring evenly and then standing still and reacting for more than a half hour, wherein the lauryl sodium sulfate in the wastewater after the reaction is self-assembled to generate a lauryl sodium sulfate micelle solubilized with the methylene blue; standing still, reacting, and then sending the wastewater to an ultrafiltration film component for ultrafiltration process; trapping the lauryl sodium sulfate micelle and completing the removal of the methylene blue in the wastewater. The method has the advantages of high removing rate, low energy consumption, no phase change, no secondary pollution, easy realization of pollutant recycling, automatic operation,and the like.

Description

technical field [0001] The invention relates to a method for treating wastewater containing organic dyes, in particular to a method for using surfactants to strengthen ultrafiltration to treat wastewater containing organic dyes. Background technique [0002] Organic dye wastewater not only has high chroma, but also affects the properties of water, and the light permeability is poor, thereby reducing the photosynthesis of plants in the water. Most dyes are also toxic and have carcinogenic, teratogenic and mutagenic effects. Methylene blue is an important cationic dye synthesized by organic chemistry. It has a wide range of industrial applications. For example, it can be used in the dyeing of hemp, silk fabrics, paper, bamboo, and wood, in the dyeing of biological and bacterial tissues, and in the manufacture of inks and dyes. Dian and so on. The wide application of methylene blue in industry will also lead to serious pollution of methylene blue-containing industrial wastewa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/44
Inventor 黄瑾辉周春飞曾光明李雪罗芳牛菁黄华军
Owner HUNAN UNIV
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