High-efficient synergistic extraction of Co(II) and Mn(II) from wastewater via novel microemulsion and annular centrifugal extractor

Add time:07/26/2019    Source:sciencedirect.com

Environmental pollution by industrial effluents polluted with hazardous heavy metals has great concern. A novel microemulsion system (sodium dodecanoate/pentan-1-ol/heptane/NaCl) was prepared for the treatment of cobalt (Co) and manganese (Mn) wastewater. The effects of the batch extraction conditions were systematically studied and the extraction efficiency of Co(II) and Mn(II) were 98.2% and 97.5% respectively at the optimal conditions. Utilizing the centrifugal reinforcement of the annular centrifugal extractor (ACE), the continuous extraction of cobalt and manganese wastewater by microemulsion could be achieved. Under the optimized operation conditions: the motor speed of 1988 rpm, a flow ratio of 1/5, and a total flow rate of 48 L/h, the maximum extraction efficiency reached up to 99.9% for Co(II) and 99.1% for Mn(II), respectively. The stripping of Co(II) and Mn(II) from the microemulsion phase was also conducted using hydrogen chloride solution, indicating a high stripping efficiency. The investigation of synergistic extraction with microemulsion and ACE proposed an efficient treatment for Co and Mn wastewater.

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