期刊
JOURNAL OF CLEANER PRODUCTION
卷 186, 期 -, 页码 282-292出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2018.03.156
关键词
Polyurethane; Coal mine drainage sludge; Arsenic; Gold mine water; Neutral mine drainage; Heavy metals
资金
- Geo-Advanced Innovative Action Project - Korea Ministry of Environment (MOE) [2012000550002, 2015000540009]
- National Research Foundation [NRF-2017R1D1A1B03029441]
- Seoul Green Environment Center (SGEC) [17-01-04-02-01]
A one-step and facile process was used to incorporate coal mine drainage sludge (CMDS) into granular polyurethane (PU), designated as PUCMPS, to remediate circumneutral mine drainages simultaneously contaminated by arsenic and heavy-metals. PUCMDS was characterized through physiochemical analyses. Several batch and column tests were carried out. CMDS was homogeneously stuck on the large-sized pore surface of PU. Based on the kinetic modeling, the low-range Biot number (B-N, 0.86-2.63) indicated that external diffusion is a main rate-limiting step. Rapid small-scale column tests (RSSCTs) also showed this phenomenon, in which the empty bed contact time (EBCT) influenced the arsenic removal efficiency more than did the PUcmps size. PUCMDS had 8190-14,330 bed volumes (BVs) of breakthrough (BT, 50 mu g L-1) for As(V), while it did not have BTs for other heavy metals, except for Fe(III). Two pilot scale columns were conducted to observe their outlets till 7644 and 3800 BVs. As a result, PUCMDS did not have any BTs for all regulations of As (total) and heavy metals. All results in this study demonstrated not only that PUCMDS can effectively remove arsenic and other heavy metals in circumneutral mine drainages, but also that it shows an example of sustainable development concept in mine sector. (C) 2018 Elsevier Ltd. All rights reserved.
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