Immobilization of arsenite from the refining discharge using Acidianus brierleyi in the presence of pyrite
Arsenite ( As ( III)) is known as more toxic species than arsenate ( As ( V) ) with one fifth of LD50 values, and more difficult to remove from drainages in the refining process of Cu ores compared with arsenate ( As ( V) ). In the present study, immobilization of the dissolved arsenite was investigated from acidic refining discharge at 701 using a thermophilic archaeon, Acidianus brierleyi. Addition of pyrite contributed to maintaining the cell populations, leading to effective As immobilization in the microbiologically mediated system. Acclimatizing A. brierleyi cells to pyrite grains lead to improved growth of the archaeon in the presence of pyrite, resulting in enhanced precipitation of secondary minerals such as jarosite and scorodite. Arsenite and/or arsenate could be immobilised through co-precipitatation with jarosite ( KFe3 ( SO4 )2 ( OH )6 ) , and/or precipitation as scorodite (FeAsO4 ? 2H2O). This study demonstrates advantages in utilizing a thermophile, which is known as one of the dominant species in bioleaching, in combination with pyrite, in the treatment process of refining discharge.
arsenite Acidianus brierleyi pyrite acclimatization electron mediator
Keiko Sasaki Masaharu Koga Koichiro Takatsugi Naoko Okibe Tsuyoshi Hirajima Satoshi Asan Shinichi Heguri
Department of Earth Resources Engineering, Kyushu University 744Motooka, Fukuoka, Japan Sumitomo Metal and Mines, Co. Ltd. .Niihama, Japano Sumitomo Metal and Mines, Co. Ltd. .Niihama, Japan
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
1106-1108
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）