Sulphide Biooxidation in Activated Sludge Diffusion Process: Microbiological and Biochemical Effects

Abstract

Sulphide was adopted as odorous compound in a simulation of AS Diffusion, an interesting process to treat odors at wastewater treatment plants by diffusing odorous air into aerobic basins. Its behaviour were experimentally evaluated along with its effects on the biomass and the biological processes supposed by some author in an AS diffusion test. Two bench scale sequencing batch reactors (SBRs) were fed in parallel on real primary sewage and monitored after adding increasing concentrations of sulphide to one of them. In this reactor, an average sulphide removal of 94% was measured. Microbial biochemical activity and composition did not show relevant variations after the addition of sulphide, and the good features of activated sludge flocs were maintained also in terms of sludge settleability.

Mitigation of diffuse CH4 and H2S emissions from the liquid phase of UASB-based sewage treatment plants: challenges, techniques, and perspectives

“…Instead of desorbing the dissolved gases into a waste gas, some technologies consider D-H 2 S or D-CH 4 direct biological oxidation in the bulk liquid, thus removing the requirement for further treatment of a waste gas. Activated sludge has been suggested for D-CH 4 (Daelman et al 2012) and D-H 2 S (Blonda et al 2018) biological oxidation, and removal efficiencies of 80% and 94% have been reported.…”