2 褐炭利用において発生する排水の環境負荷低減(改質,処理,クリーン化)

抄録

Two lignites and two sub-bituminous coals were treated by hot water extraction (HWE) and hydrothermal treatment (HTT), and the simulated effluents were obtained. The ecotoxicological impacts of these effluents were evaluated by use of acute and chronic toxicity test against some freshwater organisms and Ames mutagenicity test. The effluents from the HWE and HTT did not show any notable mutagenicity. However, an appreciable degree of mutagenicity after chlorination was observed for these effluents. The effluents from HTT indicated a considerable acute and chronic toxicity for freshwater organisms. From the FTIR and GPC analysis of the organic matters eluted in the HWE and HTT effluent, it is found that the toxicity of HWE effluents is caused by the presence of high molecular weight aromatic compounds with hydrophilic substituents.