Inhibitory effect of sulfide on the nitrifying respiratory process

Abstract

BACKGROUND: Biological wastewater treatment by nitrification is widely used; however information on inhibition of nitrification by sulfide is still scarce. The aim of this study was to evaluate the inhibitory effect of different initial sulfide concentrations on ammonium and nitrite oxidizing processes.

Inhibitory effects of sulfide on nitrifying biomass in the anaerobic–anoxic–aerobic wastewater treatment process

“…found that the IC 50 of initial sulfide concentration on a mixing of attached and suspended nitrifying sludge was 13 mg L −1 . Bejarano et al . proposed IC 50 values of sulfide for ammonium and nitrite oxidation of 2.6 ± 0.3 and 1.2 ± 0.2 mg L −1 , respectively.…”

“…Numerous studies are reported in the literature for inhibition of nitrification by toxic compounds, which include substrates of nitrifying biomass (free ammonia and free nitrite acid), salt, heavy metals, organic compounds, and inorganic anions . Owing to biomass acclimation, a constant low‐level exposure to toxic compounds usually shows insignificant adverse influences on microbial activity, but high concentration or shock loads of toxic compounds can lead to complete or partial failure of the nitrification process …”

“…In recent years, more stringent requirements on urban environment have prompted migration of municipal WWTPs to outer suburbs, and long pipeline transportation of wastewater usually creates anaerobic conditions, in which sulfide (S 2− ) is generated from anaerobic sulfate respiration . The inhibitory effect of sulfide on nitrification has been investigated for many kinds of inoculum, including nitrifying biofilm, activated sludge and estuarine sediments, by batch test under aerobic conditions. Nevertheless, in most wastewater treatment processes for nutrient removal, activated sludge is first exposed to sulfide in the influent under anaerobic or anoxic conditions for a certain time since the sulfide is usually eliminated within 30 min under aerobic conditions .…”

Bioaugmented methanol production using ammonia oxidizing bacteria in a continuous flow process

“…While recent studies have evaluated the impacts of sulfide on mixed culture nitrifying biomass, most of the studies were aimed to achieve partial nitrification by inhibiting NOB with sulfide (Erguder et al, 2008, Beristain-Cardoso et al, 2010, Kouba et al, 2017, Seuntjens et al, 2018). Some studies have demonstrated that AOB were partially inhibited and were more resilient to sulfide inhibition than NOB (Bejarano Ortiz et al, 2013, Kouba et al, 2017). However, the specific impact of biogas constituents on AOB mediated biomethanol production has not been evaluated and is as such warranted.…”

Production of rhamnolipids by Pseudomonas aeruginosa is inhibited by H2S but resumes in a co-culture with P. stutzeri: applications for microbial enhanced oil recovery

“…Furthermore, H 2 S is toxic for the metabolism of many bacteria (Bejarano et al 2013;Zhou et al 2014).…”