Sustainable bioreduction of toxic levels of chromate in a denitrifying granular sludge reactor

Environmental Science and Pollution Research International
G Kiran Kumar Reddy, Y V Nancharaiah

Abstract

Biological removal of chromate [Cr(VI)] in the presence or absence of nitrate by granular sludge biofilms was investigated in batch experiments and in a sequencing batch reactor (SBR). Denitrifying granular sludge cultivated from activated sludge was able to directly reduce Cr(VI) in the presence of an electron donor. Bioreduction was dependent on the initial Cr(VI) and the granular sludge concentrations. Bioreduction of Cr(VI) was followed by Cr(III) precipitation or entrapment in the granular sludge which was corroborated with decrease in total soluble Cr and increase in inorganic content of biomass. Batch experiments revealed that Cr(VI) addition has no major influence on high-strength nitrate (3000 mg L-1) denitrification, but nitrite denitrification was slowed-down. However, SBR experiment demonstrated successful denitrification as well as Cr(VI) removal due to enrichment of Cr(VI)-tolerant denitrifying bacteria. In fact, stable SBR performance in terms of complete and sustained removal of 0.05, 0.1, 0.2, 0.3, 0.5 and 0.75 mM Cr(VI) and denitrification of 3000 mg L-1 was observed during 2 months of operation. Active biomass and electron donor-dependent Cr(VI) removal, detection of Cr(III) in the biomass and recovery of ~ 9...Continue Reading

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Citations

Jan 7, 2019·Environmental Science and Pollution Research International·Taotao ZengShuibo Xie
Sep 28, 2020·Environmental Science and Pollution Research International·Xiaochun WangJing Kang
Jan 8, 2021·Environmental Science and Pollution Research International·Yucai LyuYaoping Zhang
Mar 31, 2021·Environmental Science and Pollution Research International·Barbara Muñoz-PalazonAlejandro Gonzalez-Martinez
Dec 28, 2019·Journal of Hazardous Materials·Jianping LuAlistair G L Borthwick
Feb 19, 2019·Environmental Science & Technology·Jiaxin ShiJianhua Guo
Oct 5, 2021·The Science of the Total Environment·Geng ChenYong Xiao

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