Arsenic removal in a sulfidogenic fixed-bed column bioreactor

Journal of Hazardous Materials
Muslum AltunKostas Komnitsas

Abstract

In the present study, the bioremoval of arsenic from synthetic acidic wastewater containing arsenate (As(5+)) (0.5-20mg/L), ferrous iron (Fe(2+)) (100-200mg/L) and sulfate (2,000 mg/L) was investigated in an ethanol fed (780-1,560 mg/L chemical oxygen demand (COD)) anaerobic up-flow fixed bed column bioreactor at constant hydraulic retention time (HRT) of 9.6h. Arsenic removal efficiency was low and averaged 8% in case iron was not supplemented to the synthetic wastewater. Neutral to slightly alkaline pH and high sulfide concentration in the bioreactor retarded the precipitation of arsenic. Addition of 100mg/L Fe(2+) increased arsenic removal efficiency to 63%. Further increase of influent Fe(2+) concentration to 200mg/L improved arsenic removal to 85%. Decrease of influent COD concentration to its half, 780 mg/L, resulted in further increase of As removal to 96% when Fe(2+) and As(5+) concentrations remained at 200mg/L and 20mg/L, respectively. As a result of the sulfidogenic activity in the bioreactor the effluent pH and alkalinity concentration averaged 7.4 ± 0.2 and 1,736 ± 239 mg CaCO3/L respectively. Electron flow from ethanol to sulfate averaged 72 ± 10%. X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electr...Continue Reading

References

Feb 12, 2002·International Journal of Systematic and Evolutionary Microbiology·Toshifumi SakaguchiTadashi Matsunaga
Apr 7, 2010·Bioprocess and Biosystems Engineering·Erkan Sahinkaya, Zeynep Yucesoy
Sep 14, 2010·Bioresource Technology·Erkan SahinkayaAnna H Kaksonen
May 23, 2012·Water Research·Fabienne Battaglia-BrunetCatherine Joulian

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Citations

Dec 27, 2015·Journal of Hazardous Materials·Sarita H AhorantaJaakko A Puhakka
Sep 4, 2015·Biotechnology and Bioengineering·Lucia Rodriguez-FreireJames A Field
Feb 28, 2016·Journal of Environmental Management·Haijuan ZhaoJiangang Zhou
Nov 28, 2019·Environmental Microbiology Reports·Timothy R McDermottRonald S Oremland
May 18, 2020·Environmental Science and Pollution Research International·Zeeshanur Rahman, Ved Pal Singh

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