Long-term operation of submerged membrane bioreactor (MBR) for the treatment of synthetic wastewater containing styrene as volatile organic compound (VOC): Effect of hydraulic retention time (HRT)

The use of electrical resistance tomography for the characterization of gas holdup inside a bubble column bioreactor containing activated sludge

“…Selection of the superficial gas velocity range was made based on the related research works on activated sludge systems including MBRs, bubble columns, and airlift reactors [12,13,[36][37][38]. All of the hydrodynamic experiments were carried out in duplicate and the mean values were reported.…”

Kinetics of styrene biodegradation in synthetic wastewaters using an industrial activated sludge

“…This suggests that microbial species capable of metabolizing styrene are present in municipal activated sludge but have to be enriched and/or adapted to toxic effects of styrene. There has been indirect evidence for the induction of a stress response mechanism in the mixed bacterial population present in industrial activated sludge as a result of increase in styrene organic loading rates in a membrane bioreactor [36]. The induction of a stress response mechanism, called the glutathione-gated potassium efflux (GGKE) system, in bacterial populations existing in activated sludge in response to shock loading of thiol reactive toxic chemicals has been previously demonstrated [37].…”

Analysis of gas phase characteristics and mixing performance in an activated sludge bioreactor using electrical resistance tomography

“…Different kinds of activated sludge processes are used for wastewater treatment because of the unique operational, economical, and environmental advantages associated with them [1][2][3]. In these three phase processes, the microbial community -in the form of a solid phase -is responsible for biodegradation of pollutants, and availability of enough oxygen for biological reactions is considered a critical factor which emphasizes the importance of an appropriate air supply to the bioreactor.…”