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

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 ...

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.