Bioremoval of arsenic species from contaminated waters by sulphate-reducing bacteria

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• 作者：Daniel Teclu ; George Tivchev ; Mark Laing ; Mike Wallis
• 关键词：Arsenate ; Arsenite ; Bioremediation ; Biosorption ; Sulphate-reducing bacteria
• 刊名：Water Research
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：42
• 期：19
• 页码：4885-4893
• 全文大小：666 K

文摘

A mixed culture of sulphate-reducing bacteria was used to study the bioremoval of arsenic species (As(III) or As(V)) from groundwater. During growth of a mixed SRB culture adapted to 0.1 mg/L arsenic species through repeated sub-culturing, 1 mg/L of either As(III) or As(V) was reduced to 0.3 and 0.13 mg/L respectively. Sorption experiments on the precipitate produced by batch cultured sulphate-reducing bacteria (SRB-PP) indicated a removal of about 77 and 55 % of As(V) and As(III) respectively under the following conditions: pH 6.9; biomass (2 g/L); 24 h contact time; initial arsenic concentration, 1 mg/L of either species. These results were compared with synthetic iron sulphide as adsorbent. The adsorption data were fitted to Langmuir and Freundlich isotherms. Energy dispersive X-ray analysis showed the SRB-PP contained elements such as sulphur, iron, calcium and phosphorus. Biosorption studies indicated that SRB cell pellets removed about 6.6 % of the As(III) and 10.5 % of the As(V) from water containing an initial concentration of 1 mg/L of either arsenic species after 24 h contact.