Response of anaerobic granular sludge to single-wall carbon nanotube exposure

Effects of CeO2 nanoparticles on production and physicochemical characteristics of extracellular polymeric substances in biofilms in sequencing batch biofilm reactor

“…A significant increase in the PRO (both in LB-EPS and TB-EPS) content was observed only at a CeO 2 NPs dosage of 50 mg/L (p < 0.05), which indicate the PRO may play a more important role in inhibiting the toxicity of CeO 2 NPs, through enhanced EPS secretion. This result was consistent with Li et al (2015) that PRO in the single-wall carbon nanotube (SWCNT) treated granules were accumulated at the outer layer of the granules, probably providing defense against the intrusion of SWCNTs. However, the production of HS decreased as the biofilm was exposed to higher concentrations of CeO 2 NPs (10 and 50 mg/L).…”

“…Previous studies have reported that the adsorption of NPs on activated sludge can affect its structural features, which may be attributed to interactions among the NPs, microbes, and their induced EPS (Li et al, 2015). In this study, the spatial distribution of CeO 2 NPs on the surface of biofilms and the surface morphology of the biofilms were obtained using SEM (Fig.…”

Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion

“…However, recently, several studies revealed that carbon nanotubes successfully promoted methanogenesis in syntrophic co-cultures as well as in complex environmental matrices [79,80]. Li et al [79] explained how the cytotoxicity of carbon nanotubes could be reduced in experiments: in anaerobic condition, the oxidative stress by free radicals is less than in an aerobic environment, and the high-purity (>90% pure) carbon nanotubes used in this study might not induce any significant residual metal toxicity. Despite the potential of graphene and carbon nanotubes as DIET promoters, their application to field-scale processes might be difficult owing to their much higher cost than other conductive materials.…”

Effect of TiO 2 nanoparticles on aerobic granulation of algal–bacterial symbiosis system and nutrients removal from synthetic wastewater

“…In addition, PN/PS ratio was about 4.2 for the granules from R T and 2.9 for those from R c , much higher than that of seed sludge (PN/PS = 1.5-1.7). This observation may be attributable to the toxicity of TiO 2 -NPs to algae resulting in more EPS secretion in the granules of R T (Li et al, 2015b;Pletikapić et al, 2012). Based on these previous works, this kind of interaction could not only prevent TiO 2 -NPs from bulk liquor into cells and reduce their cytotoxicity, but also enhance the stability of granules in R T .…”