Performance of a sulfidogenic bioreactor and bacterial community shifts under different alkalinity levels

Reactivation of carbon exhausted sulfidogenic bioreactor by fractionated sweetmeat waste dosing: The role of neutralizing substance and nitrogen supplement

“…Generally, carbonate or bicarbonate compounds like limestone (CaCO 3 ), soda ash (Na 2 CO 3 ), NaHCO 3 and quick lime (CaO) have been employed to initiate alkalinity generation in passive treatment systems or acidogenic sulfate reducing bioreactors [1,3,7,22]. In this study, the bioreactors responded very quickly with improved sulfate reduction after the addition of SMW.…”

“…At low alkalinity and pH of 5 or less, members of the genera such as Bacteroides, Dysgonomonas, Sporobacter and Clostridium dominate and generate fermentation products such as acetate, propionate, butyrate, succinate and lactate along with H 2 and CO 2 [20][21][22]. In the present study, increasing sulfate reduction in the bioreactors (Fig.…”

Effect of Sulfate Loading Rate and Organic Loading Rate on Anaerobic Baffled Reactors Used for Treatment of Sanitary Landfill Leachates

“…Based on this scenario, the acetate degradation rate is affected by sulfate reduction, provoking its inhibition at low COD/SO 4 2-ratio (Omil et al 1998;Barber and Stuckey, 2000). At high COD/SO 4 2-ratio, acetogenesis is not inhibited by sulfate reduction, while the overall reactor performance is improved by molecular hydrogen removal (JWH et al, 1994;Kalyuzhnyi et al, 1998;Dar et al, 2009;Zhao et al, 2010). If SO 4 2-is present, SRB consumes molecular hydrogen at higher rates compared with methanogenic archeas because of its superior scavenging capability (Kristjansson et al, 1982).…”

“…High anaerobic reaction rates can be achieved if hydrogen is depleted by oxidation with a suitable electron acceptor. Sulfate can accomplish this role in a cost-effective way with a low environmental impact (JWH et al, 1994, Kalyuzhnyi et al, 1998Dar et al, 2009;Zhao et al, 2010).…”

“…Sulfate-reducing bacteria (SRB) can remove molecular hydrogen, allowing optimal performance of methanogenic microorganisms (JWH et al, 1994;Kalyuzhnyi et al, 1998;Dar et al, 2009;Zhao et al, 2010). Under anaerobic conditions, SRB, alone or in consortia, use sulfate as the main electron acceptor, consuming hydrogen and VFAs.…”