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Enhancing ultrafiltration treatment method of compound wastewater containing cadmium and methylene blue by surfactant

A technology of surfactant and methylene blue, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve heavy metal wastewater investment, high operating cost, inability to realize heavy metal recycling, difficult Simultaneous removal of two substances, etc., to achieve the effect of easy recycling or recycling, reducing secondary pollution, and realizing automatic operation

Inactive Publication Date: 2010-04-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical precipitation method is simple in process, convenient in operation, economical and practical, and is widely used in wastewater treatment, but it cannot realize the recovery and utilization of heavy metals, and the stacking of sediments may also cause secondary pollution
Ion exchange treatment of heavy metal wastewater has a high degree of purification, can be recycled, and has no secondary pollution, but the actual treatment cost is very high
Biological method is not widely used because there are many problems to be solved in the process, and its load impact resistance is not high
Membrane separation methods to treat heavy metal wastewater mainly include electrodialysis, reverse osmosis, nanofiltration, etc., which have the outstanding advantages of high pollutant removal rate, ability to recover heavy metal salts in wastewater, and simple process. However, due to electrodialysis membrane, The cost of reverse osmosis membrane and nanofiltration membrane itself is high, and the required operating pressure is relatively high, resulting in high investment and operating costs for membrane treatment of heavy metal wastewater, which affects its application in large-scale industrial wastewater treatment
[0004] The existing industrial wastewater containing both cadmium and methylene blue is mainly printing and dyeing textile wastewater. Due to the differences in the properties and structures of heavy metal ions and organic matter, it is difficult to find an effective method to remove the two substances at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take the untreated composite wastewater containing cadmium ion concentration of 25mg / L and methylene blue concentration of 4mg / 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 composite wastewater self-assembled to form SDS micelles with adsorbed cadmium ions and methylene blue molecules, and then pumped the composite wastewater after the reaction. Go to the ultrafiltration membrane module for ultrafiltration treatment. The ultrafiltration membrane module is a hollow fiber ultrafiltration membrane module. Batch type, the retentate after ultrafiltration treatment is returned to the water inlet tank of the composite wastewater, and the ultrafiltration membrane intercepts the SDS micelles adsorbed with cadmium ions and methylene blue molecules, and the cadmium ions and methylene blue in the wastewater can be removed at the same time, and the blue composite wastewater After ultrafilt...

Embodiment 2

[0023] Take the untreated composite wastewater containing cadmium ion concentration of 50mg / L and 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 composite wastewater self-assembled to form SDS micelles with adsorbed cadmium ions and methylene blue molecules, and then pumped the composite wastewater after the reaction. Go to the ultrafiltration membrane module for ultrafiltration treatment. The ultrafiltration membrane module is a hollow fiber ultrafiltration membrane module. Batch type, the retentate after ultrafiltration treatment is returned to the water inlet tank of the composite wastewater, and the ultrafiltration membrane intercepts the SDS micelles adsorbed with cadmium ions and methylene blue molecules, and the cadmium ions and methylene blue in the wastewater can be removed at the same time, and the blue composite wastewater After ultrafilt...

Embodiment 3

[0027] Take the untreated composite wastewater containing cadmium ion concentration of 100mg / L and 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 composite wastewater self-assembled to form SDS micelles with adsorbed cadmium ions and methylene blue molecules, and then pumped the composite wastewater after the reaction. Go to the ultrafiltration membrane module for ultrafiltration treatment. The ultrafiltration membrane module is a hollow fiber ultrafiltration membrane module. Batch type, the retentate after ultrafiltration treatment is returned to the water inlet tank of the composite wastewater, and the ultrafiltration membrane intercepts the SDS micelles adsorbed with cadmium ions and methylene blue molecules, and the cadmium ions and methylene blue in the wastewater can be removed at the same time, and the blue composite wastewater After ultrafil...

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Abstract

The invention discloses an enhancing ultrafiltration treatment method of compound wastewater containing cadmium and methylene blue by surfactant, which comprises the following steps: adding lauryl sodium sulfate to the compound wastewater containing the cadmium and the methylene blue, wherein 6*10-3mol-8*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; after the reaction, generating a lauryl sodium sulfate micelle with cadmium ions and methylene blue molecules; standing still and reacting, then sending the wastewater to an ultrafiltration film component for ultrafiltration process; trapping the lauryl sodium sulfate micelle and completing the simultaneous removal of the cadmium and 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 composite wastewater containing heavy metals and organic dyes, in particular to a method for treating composite wastewater containing heavy metals and organic dyes by using surfactant-enhanced ultrafiltration. Background technique [0002] Methylene blue is an important organic chemical synthetic dye with a wide range of industrial applications. For example, it can be used in dyeing industries such as hemp and silk fabrics, paper dyeing, bamboo and wood dyeing, and can be used in microbiology and diagnostics such as dyeing of biological and bacterial tissues. In the field of science, it can also be used in the manufacture of inks and color lakes. However, industrial wastewater containing methylene blue is highly toxic to aquatic organisms and may cause serious pollution problems. Disposing of organic dyes such as methylene blue in wastewater has also become a severe challenge for the textile industry, dye ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/58C02F1/62C02F101/38C02F101/20
Inventor 李雪曾光明黄瑾辉周春飞罗芳牛菁
Owner HUNAN UNIV
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