Journal
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
Volume 4, Issue 2, Pages 175-182Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ew00454k
Keywords
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Funding
- GMVP from the Industrial Facilities & Infrastructure Research Program - Ministry of Land, Infrastructure and Transport of the Republic of Korea [17IFIP-B065893-05]
- Basic Science Research Program through the National Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1D1A1A02937469]
- Institute of Chemical Processes (ICP) in Seoul National University
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Lithium has become one of the most important elements due to the rapid development of mobile devices and electronics lately. There has been a steep increase in the global demand for lithium, and developing an economic supply of lithium is thereby important for battery industries. This study presents a new method for recovering lithium in wastewater from battery recycling plants, in which a considerable amount of lithium (similar to 1900 mg L-1) is discarded. There was a significant amount of organic pollutants present in the wastewater (similar to 300 mg L-1 of dissolved organic carbon), and so to resolve this, we proposed an electrochemical system containing a lithium-recovering electrode (lithium manganese oxide, LMO) and an oxidant-generating electrode (boron-doped diamond, BDD) to simultaneously recover lithium and decompose organic pollutants. Repeated operation of the electrochemical system demonstrated highly efficient and reliable lithium extraction and organic material removal from wastewater. After the lithium recovery system operation, a lithium-rich solution (98.6 mol% lithium among cations) was obtained, and the organic pollutants in the wastewater decreased by 65%. Furthermore, the electrochemical behavior of LMO and BDD was investigated under various operating conditions to provide useful insights into the industrial applications of our LMO/BDD system.
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