Abstract:Two low-rank coals, a sub-bituminous coal (BA) and a lignite (LY), were treated by hot water extraction (HWE) and hydrothermal treatment (HTT), and the environmental impacts of water-soluble matters eluted from coal by the HWE and HTT processes were evaluated in terms of TOC, mutagenicity, and the acute toxicity against freshwater organisms. When HWE was performed at 80°C, the degree of TOC for LY was much higher than that for BA. However, for HTT, the two coals gave comparable TOC values in L/S ratio of both … Show more
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