期刊
JOURNAL OF MEMBRANE SCIENCE
卷 598, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2019.117803
关键词
Precious metal recovery; Refining wastewater; Membrane distillation; Silica and chromium (III) scaling
资金
- Fundamental Research Funds for the Central Universities [2232018D3-09, 2232019G-11]
- Subject construction funds of College of Environmental Science and Engineering
- National Natural Science Foundation of China [21507142, 21477018]
- Natural Science Foundation of Shanghai, China [18ZR1401000]
- Shanghai Pujiang Program [18PJ1400400]
Precious metals, such as platinum group metals (PGMs) with distinct catalytic activity, are widely used as active components in various industrial catalysts. It is, therefore, highly desirable to recover these valuable components from the end-of-life products. We explored treatment of refining wastewater from precious metals recovery using direct contact membrane distillation (DCMD). The role of various initial pH of refining wastewater on DCMD performance was assessed. Results suggested that hydrochloride acid (HCl) and high-quality water can be reclaimed from the real refining wastewater by adjusting initial pH. Furthermore, DCMD water flux decline was mainly caused by silica and chromium (III) scaling, which was dependent on initial pH of refining wastewater. Silica scaling was responsible for the decrease of DCMD performance when the initial pH of refining wastewater increased from original 0.03 to 5 and 7. Silica oligomers in the concentrated feed with various initial pH were identified using mass spectra. Dichlorotetraaquochromiun was identified by X-ray photoelectron spectroscopy and ultraviolet and visible absorbance spectra as the main species contributing to the green colour and scaling on the PTFE membrane surface. Our results suggest that DCMD can be used as a promising and feasible solution for resource recovery from acidic refining waste stream.
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