Effects of ZnO nanoparticles on the performance of anaerobic membrane bioreactor: An attention to the characteristics of supernatant, effluent and biomass community

Anaerobic Membrane Bioreactors for Municipal Wastewater Treatment: A Literature Review

“…Interestingly, the membranes with high fouling rates also have high concentrations of EPS, which can increase the adsorption rate of soluble organic compounds [36]. The presence of metal ions adversely affects COD removal due to their toxicity [100,124]. On the contrary, the increase of conductivity by the addition of salts slightly increases the removal of organics [62].…”

“…Chen et al demonstrated that COD removal in a synthetic wastewater sample and a synthetic wastewater sample with ZnO nanoparticles added decreased from 96.4% in the first case to 81.5% in the second case [100]. Zn 2+ ions had a toxic effect on anaerobic microorganisms, thereby reducing their efficiency.…”

“…Chen et al demonstrated that, when treated under the same conditions and in the same AnMBR, a significant decrease in biogas production was observed in a synthetic wastewater sample with ZnO NPs added compared to an unadulterated synthetic wastewater sample [100]. From 0.36-0.42, production decreased to 0.11 L/gCOD and became zero in the anaerobic process.…”

Influence of zinc oxide nanoparticles on anaerobic digestion of waste activated sludge and microbial communities

“…It was reported that the zinc content in WWTP biosolids reached 8.55 × 10 3 mg kg −1 -suspended solids (SS). 11 It was also proved that ZnO NPs could significantly affect the settleability of activated sludge and removal efficiency of nitrogen and phosphorus over time. The diversity of the microbial community in the activated sludge also became less after exposure to ZnO NPs.…”

“… 9 It was proved that ZnO NPs could induce a significant growth inhibition in Methanocorpusculaceae. 10 ZnO NPs also show obvious toxicity in activated sludge, compared with other NPs 11 even at low concentration.…”