Effects of bacterial activity on estrogen removal in nitrifying activated sludge

Influence of operational parameters (sludge retention time and hydraulic residence time) on the removal of estrogens by membrane bioreactor

“…Therefore, high nitrification activities were detected in the biomass. This behavior was observed by Vader et al (2000), Shi et al (2004), Yi and Harper (2007) and Ren et al (2007) by nitrifying bacteria.…”

“…An increase of SRT can allow the development of specific organisms of slow growth within the biological process (e.g., nitrifying bacteria), establishing in this way, one diverse population of microorganisms with high physiological capabilities to degrade specific pollutants achieve a full adaptation to these contaminants (Clouzot et al 2010). The positive influence of long SRT on nitrification increased the estrogen removal (Ren et al 2007). Therefore, the determination of a working range of SRT in MBR is very important.…”

Transformation and fate of natural estrogens and their conjugates in wastewater treatment plants: Influence of operational parameters and removal pathways

“…Joss et al (2004) also found that the maximum removal rate of E1 occurred under aerobic conditions in WWTPs. The biodegradation of estrogens by activated sludge was considered as dominated by the co-metabolism of ammonia oxidizing bacteria (Ren et al, 2007). In this case, the oxidation treatment units would certainly show a better performance in removing estrogens.…”

General Fate Model for Microconstituents in an Activated Sludge System

“…However, there are limited and debatable information on the role of autotrophs on MCs biodegradation in AS systems operating at different SRTs . It was concluded that the AOB are responsible for the degradation of estrone, estradiol, and ethinylestradiol (Ren et al, 2007). Some studies also reported some MCs and EDCs could have higher removal in nitrifying AS .…”