Impact of certain household micropollutants on bacterial behavior. Toxicity tests/study of extracellular polymeric substances in sludge

Biodegradation of benzotriazoles and hydroxy-benzothiazole in wastewater by activated sludge and moving bed biofilm reactor systems

“…The existence of low concentrations of micropollutants could also affect bacterial behaviour. In a recent study, it was reported that even small concentration of a xenobiotic compound (0.1 µg L -1 for PFOA and PFOS and 0.5 µg L -1 for triclosan) can provoke increase of extracellular polymers (EPS) in sludge, therefore affecting the transfer of substances from the mixed liquor to the interior of the flocs or the biofilm(Pasquini et al, 2013). This could decrease the amount of micropollutants available to microorganisms and therefore decrease their removal.…”

General Fate Model for Microconstituents in an Activated Sludge System

“…It was found that TCS could also be harmful to AS bacteria at concentration more than 1.82 mg/L and to nitrifying bacteria at concentration as low as 500 µg/L (Stasinakis et al, 2007). Pasquini et al (2013) also reported that TCS altered the bacterial growth at concentrations measured in wastewater by investigating the toxicity of TCS on E. coli and comparing EPS production in reactors with and without MCs addition. In contrast, other studies reported no deterioration of AS systems performance in the presence of TCS at low µg/L concentration (Federle et al, 2002;.…”

“…Pasquini et al (2013) reported that TCS altered the bacterial growth at concentrations measured in wastewater by investigating the toxicity of TCS on E. coli and comparing EPS production in reactors with and without MCs addition. In contrast, other studies reported no deterioration of AS systems performance in the presence of TCS at low µg/L concentration (Federle et al, 2002;).…”

Emerging Pollutants – Part II: Treatment

“…In-situ and subsurface treatment. In-situ biodegradation using aerobic co-metabolism of methane and benzene amended groundwater (in soil columns) was shown to be a viable treatment for remediation of Nnitrosodimethylamine (NDMA) and a structural analog (Weidhaas and DuPont, 2013 (Pasquini et al, 2013). Fate and occurrence of 36 emerging pollutants were investigated during primary and secondary treatment in a WWTP .…”

“…Chemical pollutants that do not have an antibacterial effect still were shown to be of some concern to wastewater treatment. Eight micropollutants originating from household use were studied for effect on activated sludge microbial population (Pasquini et al, 2013). Some…”