Specific microbial diversity and functional gene (AOB amoA) analysis of a sponge-based aerobic nitrifying moving bed biofilm reactor exposed to typical pharmaceuticals

Impacts of sulfadiazine on the performance and membrane fouling of a hybrid moving bed biofilm reactor-membrane bioreactor system at different C/N ratios

“…In a nutshell, compared with phase I, the removal efficiency of NH 4 + -N with SDZ fell by 12%, 9%, 7% and 6%, respectively. The removal rate of NH 4 + -N in reactors after adding SDZ reduced in different degrees because of the inhibition of NH 4 + -N functional gene (AOB amoA) by SDZ (Song et al, 2020). Moreover, the removal of ammonia nitrogen gradually rose when the C/N ratio increased, which could explain that the existence of biofilm improved the removal rate of ammonia nitrogen.…”

“…However, for SDZ, due to its non-hydrophilic physical and chemical properties, it is mainly removed by the biodegradation of microorganisms enriched on the carrier (Luo et al, 2014;Yu et al, 2018). When the influent C/N ratio was 3.5, the aerobic MBBR had an average removal efficiency of 61.11 ± 8.82% on SDZ with a concentration of 1-5 mg/L (Song et al, 2020). Moreover, when the aerobic submerged membrane bioreactor system was used to treat wastewater containing SDZ with a concentration of 5 μg/L and a C/N of about 5.5, the removal efficiency of SDZ reached 91%.…”

Periodic chemical cleaning with urea: disintegration of biofilms and reduction of key biofilm-forming bacteria from reverse osmosis membranes

“…The bacterial community was the least diverse and more homogenous after the 6 th cleaning cycle with urea. Under toxic conditions, for example at excessively high concentrations of pharmaceuticals, microorganisms lose their vitality, which in turn leads to a decline of biodiversity ( Song et al. 2020 ).…”

Nitrogen-metabolising Microorganism Analysis in Rapid Sand Filters From Drinking Water Treatment Plant by Culturing and Metagenomics

“…is a key ammonium-oxidising bacterium (Shitu et al 2020) and can oxidise ammonium to nitrite (Yang et al 2019). It has always been dominant in many natural and engineered ecosystems (Lin et al 2020, Ma et al 2020b, Ma et al 2020c, Song et al 2020. Furthermore, 13 MAGs that included the hydroxylamine oxidoreductase (hao) gene, and SF2 bin.117, identi ed as Bradyrhizobium-like MAG, included the hao gene.…”