| Abstract | The presence of arsenic (As) in aquatic environments is often attributable to geogenic processes occurring within aquifers. Arsenic exists in two prevalent oxidation states, with the trivalent arsenite [As(III)] exerting stronger toxicity effects on the aquatic biota than the pentavalent arsenate [As(V)]. The review evaluates the literature available on the main arsenic removal technologies and the application of combined chemical and biological treatments. We provide a synthetic outlook on the potential strategies of biological As(III) oxidation to As(V) by means of cell-detoxifying mechanisms or metabolic processes with the aim to enhance As removal efficiency. Furthermore, the role of microorganisms in the mobility of arsenic in natural systems as well as the distribution of As-resistant bacteria, potentially suitable for arsenic removal, is discussed in the context of a case study carried out in Latium region (Italy), which is known for arsenic contamination of waters. |
| Text | 340962 2015 10.1007/s12210 015 0461 y Scopus 2 s2.0 84941359632 Arsenic Arsenite oxidation As resistant bacteria Microbial ecology Water treatment Arsenic removal from naturally contaminated waters a review of methods combining chemical and biological treatments Fazi S.; Amalfitano S.; Casentini B.; Davolos D.; Pietrangeli B.; Crognale S.; Lotti F.; Rossetti S. Water Research Institute, National Research Council of Italy IRSA CNR , Via Salaria, km 29.300, Monterotondo, Rome, 00015, Italy; INAIL, Research, Certification, Verification Area, Department of Technological Innovations and Safety of Plants, Products and Anthropic Settlements DIT , Via Alessandria, 220/E, Rome, 00198, Italy; Department of Ecological and Biological Sciences DEB , University of Viterbo La Tuscia, Largo dell Universita`, Viterbo, 01100, Italy The presence of arsenic As in aquatic environments is often attributable to geogenic processes occurring within aquifers. Arsenic exists in two prevalent oxidation states, with the trivalent arsenite As III exerting stronger toxicity effects on the aquatic biota than the pentavalent arsenate As V . The review evaluates the literature available on the main arsenic removal technologies and the application of combined chemical and biological treatments. We provide a synthetic outlook on the potential strategies of biological As III oxidation to As V by means of cell detoxifying mechanisms or metabolic processes with the aim to enhance As removal efficiency. Furthermore, the role of microorganisms in the mobility of arsenic in natural systems as well as the distribution of As resistant bacteria, potentially suitable for arsenic removal, is discussed in the context of a case study carried out in Latium region Italy , which is known for arsenic contamination of waters. Published version http //www.scopus.com/inward/record.url eid=2 s2.0 84941359632 partnerID=q2rCbXpz Arsenic removal from naturally contaminated waters a review of methods combining chemical and biological treatments Fazi_et_al_Rendiconti_Lincei_2015.pdf Articolo in rivista Springer Verlag Italia 2037 4631 Rendiconti lincei. Scienze fisiche e naturali Rendiconti lincei. Scienze fisiche e naturali Rend. lincei, Sci. fis. nat. Rendiconti lincei. Scienze fisiche e naturali. Rendiconti lincei simona.crognale CROGNALE SIMONA simona.rossetti ROSSETTI SIMONA stefano.fazi FAZI STEFANO stefano.amalfitano AMALFITANO STEFANO barbara.casentini CASENTINI BARBARA |
