Recovery of sulfuric acid aqueous solution from copper-refining sulfuric acid wastewater using nanofiltration membrane process
- Authors
- Yun, T.; Chung, J.W.; Kwak, S.-Y.
- Issue Date
- Oct-2018
- Publisher
- Academic Press
- Keywords
- Copper-refining sulfuric acid wastewater; Nanofiltration membrane; Sulfuric acid recovery; Acid stability
- Citation
- Journal of Environmental Management, v.223, pp.652 - 657
- Journal Title
- Journal of Environmental Management
- Volume
- 223
- Start Page
- 652
- End Page
- 657
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/31176
- DOI
- 10.1016/j.jenvman.2018.05.069
- ISSN
- 0301-4797
- Abstract
- We used a nanofiltration (NF) membrane process to produce purified aqueous sulfuric acid from copper-refining sulfuric acid wastewater. Wastewater generated from a copper-refining process was used to explore the membrane performances and acid stabilities of six commercial NF membranes. A combination of permeate flux, sulfate permeation, and metal ion rejection clearly showed that two polyamide membranes and a polyacrylonitrile-based membrane achieved recovery of a purified sulfuric acid solution. Acid-stability and long-term performance tests showed that the polyamide membranes were unsuitable for copper-refining wastewater treatment because of their low acid stabilities. In contrast, the polyacrylonitrile-based composite membrane showed excellent acid stability, and gave greater than 90% metal ion rejection, with the exception of calcium ions, for 430 d. We also evaluated the recovery performance in 1 ton/d pilot-scale process using wastewater from copper-refining process; 90% metal ion rejection was achieved, with the exception of calcium ions, even at 95% recovery rate. © 2018 Elsevier Ltd
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