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Cyanide removal from wastewater using gas membranes: pilot-scale study
Zhisong Shen1, Binbing Han, Ranil Wickramasinghe
1Department of Environmental Engineering, Jiangsu Institute of Microbiology, Wuxi, China.
Summary
Hollow-fiber gas membranes effectively remove cyanide from wastewater. However, dissolved solutes and other volatile species in the wastewater can reduce removal efficiency and purity.
Area of Science:
- Environmental Engineering
- Chemical Engineering
- Water Treatment
Background:
- Cyanide is a toxic pollutant requiring effective removal from industrial wastewater.
- Hollow-fiber gas membrane technology offers a potential solution for cyanide remediation.
Purpose of the Study:
- To evaluate the performance of a pilot-scale hollow-fiber gas membrane system for cyanide removal from diverse wastewaters.
- To identify factors affecting cyanide removal efficiency and the purity of recovered cyanide.
Main Methods:
- A pilot-scale membrane facility with 10 hollow-fiber modules (180 m2 total surface area) was utilized.
- The system treated four different types of industrial wastewater for cyanide removal.
Main Results:
- The pilot-scale results generally aligned with prior laboratory findings.
- Dissolved solutes in wastewater decreased cyanide removal efficiency and the purity of recovered cyanide.
- Co-removal of other volatile species and potential water vapor transfer were observed.
Conclusions:
- Hollow-fiber gas membranes are a viable technology for cyanide removal from wastewater.
- Wastewater composition significantly impacts process efficiency and product purity.
- Further optimization is needed to mitigate the effects of dissolved solutes and co-contaminants.