TY - JOUR
T1 - Treatment of a platinum leachate by membrane distillation
T2 - Mechanism of combined silica scaling and organic fouling for distinct system performance decline
AU - Chen, Gang
AU - Xie, Ming
AU - Huang, Manhong
N1 - Funding Information:
The authors would like to thank the partial financial support from Natural Science Foundation of Shanghai (No. 20ZR1400100 ), Fundamental Research Funds for the Central Universities (No. 2232018D3-09 ), National Natural Science Foundation of China (No. 21507142 ) and National Key Research Development Program of China (No. 2019YFC0408304 ).
Publisher Copyright:
© 2020 Institution of Chemical Engineers
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/2/28
Y1 - 2021/2/28
N2 - Platinum (Pt) is an important rare element and has been widely using in electronic industry, chemical industry and defense industry due to its unique physicochemical properties. Given the high cost of exploiting Pt from limited natural ores, it is desirable to recover Pt from secondary resources for sustainable development. In this study, direct contact membrane distillation (DCMD) was employed to treat a real acidic platinum leachate (PL) with high-salinity. Results of membrane autopsy and silica-membrane interaction revealed that DCMD system performance decline in varying degrees was due to combined silica scaling and organic fouling. Importantly, it was found that the mass-to-charge ratio (m/z) range change of organic compounds in PL had significant effect on system performance. The low molecular compounds in PL with m/z value distributed in a smaller range from 100 to 200 at pH of 1, 3 and 7 possibly resulted in the membrane pores blockage, which was the main reason for the permeate fluxes rapid decline during DCMD process. Despite high molecular compounds with m/z value ranging widely from 100 to 600 detected in the concentrated PL, there was negligible effect on permeate flux decline in the initial stage at initial pH of 5. Deterioration of DCMD performance at pH of 5 was mainly due to accumulated silica scaling caused by the lower concentration of silica.
AB - Platinum (Pt) is an important rare element and has been widely using in electronic industry, chemical industry and defense industry due to its unique physicochemical properties. Given the high cost of exploiting Pt from limited natural ores, it is desirable to recover Pt from secondary resources for sustainable development. In this study, direct contact membrane distillation (DCMD) was employed to treat a real acidic platinum leachate (PL) with high-salinity. Results of membrane autopsy and silica-membrane interaction revealed that DCMD system performance decline in varying degrees was due to combined silica scaling and organic fouling. Importantly, it was found that the mass-to-charge ratio (m/z) range change of organic compounds in PL had significant effect on system performance. The low molecular compounds in PL with m/z value distributed in a smaller range from 100 to 200 at pH of 1, 3 and 7 possibly resulted in the membrane pores blockage, which was the main reason for the permeate fluxes rapid decline during DCMD process. Despite high molecular compounds with m/z value ranging widely from 100 to 600 detected in the concentrated PL, there was negligible effect on permeate flux decline in the initial stage at initial pH of 5. Deterioration of DCMD performance at pH of 5 was mainly due to accumulated silica scaling caused by the lower concentration of silica.
KW - DCMD performance
KW - Mass-to-charge ratio
KW - Membrane scaling and fouling
KW - Platinum leachate
UR - http://www.scopus.com/inward/record.url?scp=85098552681&partnerID=8YFLogxK
U2 - 10.1016/j.psep.2020.12.030
DO - 10.1016/j.psep.2020.12.030
M3 - Article
AN - SCOPUS:85098552681
VL - 146
SP - 877
EP - 885
JO - Process Safety and Environmental Protection
JF - Process Safety and Environmental Protection
SN - 0957-5820
ER -