Effect of acclimation and nutrient supply on 5-tolyltriazole biodegradation with activated sludge communities

Sorption and biodegradation of selected benzotriazoles and hydroxybenzothiazole in activated sludge and estimation of their fate during wastewater treatment

“…S4). Previous studies also reported absence of removal of 4TTR during activated sludge process (Weiss et al, 2006;Herzog et al, 2014a), while biodegradation of 5TTR seems to be slow (complete removal after 91 d, according to Liu et al, 2011) which is enhanced by adaptation of microorganisms (Herzog et al, 2014b). The experiment on micropollutants' partitioning during biodegradation experiments showed, as expected, that the greatest part of the target compounds were in the dissolved phase and this part significantly decreased during the experiment.…”

Hybrid Moving Bed Biofilm Reactor for the biodegradation of benzotriazoles and hydroxy-benzothiazole in wastewater

“…Concerning 4TTR, it seems that the biomass grown in BC2 had the ability to biodegrade it, whereas this property was not present in BC1. So far, in the literature contradictory results have been reported for biodegradation of 4TTR and 5TTR in AS and MBBR systems, indicating the important role of biomass used and the role of specific microorganisms on its removal [19,27,28] Comparison of the removal efficiency of target compounds in the HMBBR system with those previously observed in pure MBBR and AS systems [17,19] showed that the current system achieved similar or statistically higher elimination for 5 out of 6 examined chemicals ( Figure 3a). Only 4TTR was removed more efficiently in a pure MBBR system that operated under lower organic loading conditions (0.25 kg m -3 d -1 in the first stage and 0.05 kg m -3 d -1 in the second stage) and double HRT.…”

Microbial Adaptation to Ionic Liquids Increases the “Talent” to Treat Contaminants

“…18−20 However, its potential for dyes removal was extremely low, so we have bet in acclimation as a suitable strategy for improving its bioremediation ability, as demonstrated by other authors. 21 To widen the applicability of this bacterium, imidazolium-based ionic liquids have been chosen since they make up a group of neoteric contaminants with recalcitrant moieties like the nitrogen heteroatom inserted in the aromatic ring and displaying high toxicity. 22 Then, after a 2 month period of acclimation in a stirred tank bioreactor containing the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate (C 2 C 1 imC 2 SO 4 ), 23 the obtained strain was chosen for assessing its potential as dye bioremediation agent.…”