Rapid start-up of partial nitritation in aerobic granular sludge bioreactor and the analysis of bacterial community dynamics

Addition of sodium alginate as a nucleus shortens granulation of aerobic sludge

“…Bacteria with the ability for nitrification and denitrification belong to the Gammaproteobacteria subgroups and play an indispensable role in nitrogen removal. 93,94 Furthermore, some bacteria in the Alphaproteobacteria class can secrete EPS for granulation. 95 Our findings show that SAN addition provides favorable conditions for functional bacteria to secrete EPS and remove pollutants in particular, the abundance of the Actinobacteria class containing filamentous bacteria in sample AGS_1 was different from that of other samples.…”

Rapid Formation and Performance of Aerobic Granular Sludge Driven by a Sodium Alginate Nucleus under Different Organic Loading Rates and C/N Ratios

“…This may be ascribed to the anoxic/anaerobic zones inside the AGS [47,48], which resulted in excellent denitrification performance [49]. It is worth noting that the TN removal efficiency in P1-R5 was the best, which may be due to the fact that a high OLR was beneficial to the denitrifying bacteria [50]. In the high OLR system, the sludge particles shed from the inner wall of the reactor, thereby resulting in a micro-local DO gradient, which improved the efficiency of the denitrification process.…”

“…However, as the granulation and particle size increased during the mature period, the anoxic/anaerobic zone inside the AGS increased [47,48], which enhanced the denitrification, and, eventually, the TN removal efficiency increased to 70-80%. In addition, the higher C/N group (P2-R3 and P2-R4) provided a sufficient carbon source for denitrification [50], and thus, the TN removal efficiency was better than in the lower C/N group (P2-R1 and P2-R2) in the adaptation period. However, from the mature period, it remained stable, with a difference of less than 10%.…”

The Invasion of Alternanthera philoxeroides Increased Soil Organic Carbon in a River and a Constructed Wetland With Different Mechanisms

“…In addition, the change of soil physicochemical properties such as pH and temperature caused by plant invasion can indirectly affect SOC storage by affecting microbial activities (Bainard et al, 2016;Nguyen et al, 2018). The carbon storage of wetlands was affected by certain microbes such as Betaproteobacteria and Planctomycetacia (Xin and Qin, 2019). The carbon metabolic rate could be altered by the variation of the microbial community.…”