Arsenate reduction and mobilization in the presence of indigenous aerobic bacteria obtained from high arsenic aquifers of the Hetao basin, Inner Mongolia. (August 2015)

• Record Type: Journal Article
• Authors: Guo, Huaming; Liu, Zeyun; Ding, Susu; Hao, Chunbo; Xiu, Wei; Hou, Weiguo
• Is Part Of: Environmental pollution. Volume 203(2015)
• Page Start: 50
• Page End: 59
• Publication Date: 2015-08
• Subjects: Arsenic species -- Biogeochemistry -- Indigenous microorganism -- Microbial -- Redox -- Hetao basin; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2015.03.034
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Intact aquifer sediments were collected to obtain As-resistant bacteria from the Hetao basin. Two strains of aerobic As-resistant bacteria ( Pseudomonas sp. M17-1 and Bacillus sp. M17-15) were isolated from the aquifer sediments. Those strains exhibited high resistances to both As(III) and As(V). Results showed that both strains had arr and ars genes, and led to reduction of dissolved As(V), goethite-adsorbed As(V), scorodite As(V) and sediment As(V), in the presence of organic carbon as the carbon source. After reduction of solid As(V), As release was observed from the solids to solutions. Strain M17-15 had a higher ability than strain M17-1 in reducing As(V) and promoting the release of As. These results suggested that the strains would mediate As(V) reduction to As(III), and thereafter release As(III), due to the higher mobility of As(III) in most aquifer systems. The processes would play an important role in genesis of high As groundwater. Highlights: Two strains of As-resistant bacteria were isolated from high As aquifer sediment. The strains (M17–1 and M17-15) had an As tolerance under oxic conditions. The strains had arr and ars genes, and reduced both dissolved As(V) and solid As(V). Reduction of solid As(V) resulted in As release into solutions. M17-15 had a higher ability in reducing As(V) and promoting As release than M17-1. Abstract : Indigenous aerobic bacteria from the high-As aquifer sediment had arr and ars genes and led to reduction of dissolved As(V), goethite-adsorbed As(V), scorodite As(V) and sedimentary As.