Stable nitrification under sulfide supply in a sequencing batch reactor with a long fill period

Sequencing batch reactor technology for landfill leachate treatment: A state-of-the-art review

“…Short settling time selects rapid settling bacteria while poor settleability sludge is effectively removed. Low temperature is considered a severe challenge in simultaneous N and P removal systems, and receives exploration because it has an unfavorable impact on microbial activity in activated sludge (Sekine, Akizuki, Kishi, & Toda, 2018).…”

Nitrification in the presence of sulfide and organic matter in a sequencing moving bed biofilm reactor (SMBBR) with zeolite as biomass carrier

“…Nitrite accumulation has been reported by other researchers in the presence of sulfide only, but not in the presence of sulfide and OM. For instance, Sekine et al indicated that 15 mgHS − L −1 is the limit at which nitrification is inhibited by 75%.…”

“…Acclimation to inhibitory conditions was reported by Zhou et al, who observed data that might be related to the use of nitrifying biomass acclimatized with sulfide of 3.56 mg L −1 in the influent, which contributed to a greater tolerance of the nitrifying biomass to sulfide. However, Sekine et al indicated that a sequencing batch operation with a long fill period, which is suitable for retaining sludge within the reactor, could improve the acclimation of the nitrifying sludge to sulfide. Thus, the acclimation of nitrifying biomass to low sulfide levels in the inner part of the biofilm could explain the good performance of nitrification in the system.…”

Evaluating and modeling biological sulfur production in the treatment of sulfide‐laden streams containing ammonium

“…Moreover, AOB are highly sensitive to low sulfide concentrations. The IC 50 for AOB reported in the literature ranges from 3 ± 0.3 to 0.7 mg TDS L −1 37,38 . Since sulfide concentrations were around 1 mg L −1 in the reactor during the first 40 days, partial inhibition of AOB by free sulfide could have occurred in this stage.…”