Effect of influent COD/SO4(2-) ratios on UASB treatment of a synthetic sulfate-containing wastewater

Chemosphere
Yong HuYu-You Li

Abstract

The effect of the chemical oxygen demand/sulfate (COD/SO4(2-)) ratio on the anaerobic treatment of synthetic chemical wastewater containing acetate, ethanol, and sulfate, was investigated using a UASB reactor. The experimental results show that at a COD/SO4(2-) ratio of 20 and a COD loading rate of 25.2gCODL(-1)d(-1), a COD removal of as high as 87.8% was maintained. At a COD/SO4(2-) ratio of 0.5 (sulfate concentration 6000mgL(-1)), however, the COD removal was 79.2% and the methane yield was 0.20LCH4gCOD(-1). The conversion of influent COD to methane dropped from 80.5% to 54.4% as the COD/SO4(2-) ratio decreased from 20 to 0.5. At all the COD/SO4(2-) ratios applied, over 79.4% of the total electron flow was utilized by methane-producing archaea (MPA), indicating that methane fermentation was the predominant reaction. The majority of the methane was produced by acetoclastic MPA at high COD/SO4(2-) ratios and both acetoclastic and hydrogenthrophic MPA at low COD/SO4(2-) ratios. Only at low COD/SO4(2-) ratios were SRB species such as Desulfovibrio found to play a key role in ethanol degradation, whereas all the SRB species were found to be incomplete oxidizers at both high and low COD/SO4(2-) ratios.

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Citations

Oct 11, 2016·Water Research·Sebastian Stasik, Katrin Wendt-Potthoff
Sep 1, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Gabriela F SampaioGiselle P Sancinetti
Oct 16, 2019·Applied Microbiology and Biotechnology·Flávio C F BaleeiroHeike Sträuber
Nov 9, 2019·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Gloria GómezGladys Vidal
Nov 16, 2019·The Science of the Total Environment·E Fernández-PalaciosD Gabriel
Jan 20, 2021·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Adoum Mahamat Ahmat, Yannick Mamindy-Pajany
Jan 15, 2020·Journal of Environmental Management·Ana Flávia Rezende SilvaKonrad Koch
Apr 13, 2021·Environmental Technology·Angélica Marcia Dos SantosRenata Piacentini Rodriguez
Jul 2, 2021·Journal of Environmental Management·A F R SilvaM C S Amaral
Aug 13, 2021·Environmental Technology·Gabriela MéndezValeria Ochoa-Herrera

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