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New industrial application of forward osmosis (FO): Precious metal recovery from printed circuit board (PCB) plant wastewater

Authors
Gwak, GimunKim, David InhyukHong, Seungkwan
Issue Date
15-4월-2018
Publisher
ELSEVIER SCIENCE BV
Keywords
Forward osmosis (FO); Draw solution; Industrial application; Resource recovery; Printed circuit board (PCB) wastewater treatment
Citation
JOURNAL OF MEMBRANE SCIENCE, v.552, pp.234 - 242
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MEMBRANE SCIENCE
Volume
552
Start Page
234
End Page
242
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/76136
DOI
10.1016/j.memsci.2018.02.022
ISSN
0376-7388
Abstract
As a promising industrial application of forward osmosis (FO), an FO-based concentration system for precious metal recovery from printed circuit board (PCB) wastewater has been newly suggested. This novel FO concentration process utilizes a dilution-needed waste solution possessing high conductivity as a draw solution, and thus an external supply of draw solution as well as a re-concentration process for the diluted draw solution are not required. An electroless (E'less) nickel (Ni) plating solution was evaluated as dilution-needed waste stream-based draw solution, and the test results confirmed that the selected Ni solution could produce an acceptable FO performance, i.e., water flux of 39.4 LMH (active layer facing draw solution (AL-DS) mode with deionized feed solution). From a series of FO experiments conducted with a palladium (Pd) catalyst as a concentration-needed feed solution, the Pd solution was effectively concentrated under an active layer facing feed solution (AL-FS) mode with a slight impact from Pd scaling. The modeling prediction based on our experimental results showed that theoretically Pd can be concentrated 17.2-times-high. The overall performance of our Pd concentration tests indicated that the FO process is promising for concentrating Pd, thereby improving the efficiency of its recycling. The newly proposed system, a recovery-free FO driven by a waste stream, offers attractive economic advantages including (1) zero cost for the supply and re-concentration of the draw solution and (2) enhanced energy efficiency in the precious metal recycling process.
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공과대학 (건축사회환경공학부)
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