Recovery of anaerobic ammonium oxidation via hydrazine following sulfate inhibition

Abstract

Sulfate in sewage treatment has obviously impact on the biological nitrogen removal. We explored the influence mechanism of sulfate on anammox and the recovery of hydrazine on anammox after inhibition....

Low strength and COD/N wastewater treatment via controlled nitrification by a membrane aerated biofilm, partial denitrification by activated sludge, and anaerobic ammonia oxidation by granular sludge

“…5c, NO 3 − –N concentration showed a linear increase from 0.29 to 5.21 mg L −1 with a reaction time of 380 min, following pseudo-zero-order reaction kinetics with a reaction rate constant of 0.0119 mg L −1 min −1 . The reaction rate constant per unit active biomass for NH 4 + –N consumption was 1.01 mg gMLVSS −1 h −1 in this study, significantly higher than 0.49 mg gMLVSS −1 h −1 in a recent ANAMMOX reaction kinetics study with activated sludge 31 but significantly lower than 3.6–4.0 mg gMLVSS −1 h −1 in another ANAMMOX reaction kinetics study with biofilm. 32 The ratio of NO 2 − –N consumption rate constant to NH 4 + –N consumption rate constant was 1.12, while the ratio of removed NO 2 − –N to removed NH 4 + –N during the reaction process ranged from 1.02 to 1.45 with an average of 1.16 (as shown in Fig.…”