Performance evaluation and microbial community structure of mesh rotating biological reactor treating sewage

Characterization of the nitrogen-transforming microbial community in the biofilms of a full-scale rotating biological contactor system treating wastewater from a fresh market building

“…40 Pilot-scale MRBRs were also mainly composed of Proteobacteria (≈68.2–73.3%). 1 Together with the presence of Proteobacteria , a combination of the phyla Bacteroidetes , Planctomycetes , Firmicutes , Chloroflexi , Acidobacteria , Verrucomicrobia , Actinobacteria , Nitrospirae , Chlorobi , and Gemmatimonadetes in T1 and T2 accounted for 43% and 46% relative abundance, respectively (Fig. 2).…”

“…Nitrosomonas accounted for 0.3-0.4% of the total microbial abundance in a MRBR treating sewage. 1 qPCR revealed that the numbers of AOB and Nitrospira were comparable. The number of AOB was approximately 10 times higher than that of comammox, but it was lower than that of anammox (Fig.…”

“…RBCs have been extensively used to treat organics, nitrogen, and other pollutants (e.g., pharmaceuticals and personal care products) in wastewater. [1][2][3] RBCs have received much attention because of their compact design, low start-up and maintenance costs, and relatively low production of excess sludge. 2,4 RBC media comprise a series of discs covered by a biofilm on their entire surface.…”

“…Previous studies have suggested that AOB and AOA play key roles in ammonia oxidation in high-and low-ammonia strength wastewater, respectively. 3,14,15 The AOB found in biofilms of mesh rotating biological reactors (MRBRs) were associated with Nitrosomonas and Nitrosospira, 1 while AOA in RBCs treating municipal wastewater belonged to uncultured Thaumarchaeota. 3 Nitrite oxidation converts nitrite, being produced from ammonia oxidation, to nitrate.…”

Assessment of the start-up of the passive aeration simultaneous nitrification and denitrification (PASND) process using activated sludge as a sole seed for low-energy C and N removal

“…The rotating biological contactor (RBC) uses rotating plates to bring oxygen into the reactor rather than aggressive aeration. 2,3 However, the large-scale application of RBC is limited by the poor total nitrogen removal (<36%). 4,5 The use of a trickling filter (TF) also enables significant savings in aeration energy as wastewater is trickled over the surface of the biofilm 6 attached to the supporting material, which provides a sufficient void space to allow air ventilation and diffusion.…”