Succession of bacterial community in anaerobic–anoxic–aerobic (A2O) bioreactor using sludge fermentation liquid as carbon source

Abstract

2015) Succession of bacterial communityin anaerobic-anoxic-aerobic (A 2 O) bioreactor using sludge fermentation liquid as carbon source, Desalination and Water A B S T R A C TTo analyze the effect of sludge fermentation liquid on succession of bacterial community as carbon source, a three-month-long experiment was conducted in anaerobic-anoxic-aerobic process at room temperature. Experimental results showed that the removal efficiencies of total nitrogen and total phosphorus were improved to 84.7 and 94.3% from 64.5 and 54.2% at flow ratio of fermentation liquid and municipal wastewater, 1:35. Meanwhile, the principal component analysis demonstrated that significant shifts of bacterial community were observed with fermentation liquid addition. In particular, fermentation liquid appeared to be selective for the phosphorus-removal bacteria Gammaproteobacteria, denitrifying bacteria Comamonas sp., nitrogen-removal bacteria Betaproteobacteria, and denitrifying phosphate accumulating organisms Sphingobacterium, indicating simultaneous nitrification and denitrification, and denitrifying dephosphatation might be present after fermentation liquid addition.

The SBR start-up performing simultaneous removal of organics, nitrogen and phosphorus from aniline wastewater: Pollutant removal efficiency and microbial community succession

“…For instance, genus Flexibacter, which was detected in a lab-scale anammox membrane bioreactor [30], could reduce nitrate to nitrite and further to nitrous oxide with organic compounds. Genus Comamonas, which could act as denitrifying bacteria [28], was also detected in S3 in the present study. In addition, several species responsible for phosphorus removal under aerobic/anoxic phase such as Aeromonas and Acinetobacter were found in S3.…”

“…The shift of the most popular Proteobacteria subgroup from Gammaproteobacteria to Alphaproteobacteria after the reactor was fed with aniline-containing influent suggested that class Alphaproteobacteria, which can also be predominant in previous publication related to aniline wastewater treatment [26], had higher tolerance to the presence of aromatic pollutants in the wastewater than Gammaproteobacteria in the present work. In addition, it can be noted that in the present SBR, the proportion increase of phylum Bacteroidetes during treatment of aniline-containing wastewater could be largely attributed to the remarkable increase of its sub-group namely class Sphingobacteriia which could be involved in the aromatic removal [27], and have denitrifying phosphate accumulating potential [28].…”

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

“…Almost all the biological processes have been explored in terms of biomass composition (bacteria, protozoa, metazoan, and fungi) and activity: conventional activated sludge, attached biomass, membrane reactors, and treating either municipal [27][28][29][30][31][32][33][34] or industrial wastewater [35][36][37][38][39]. Likewise, identification and quantification of microorganisms operating under different conditions (aerobic, anoxic, and anaerobic) have been reported [25,[40][41][42][43][44][45][46].…”

Correlation of extracellular polymeric substances and microbial community structure in denitrification biofilm exposed to adverse conditions

“…The MLVSS contents of the denitrification suspended carriers in R1 to R4 were 6.27 ± 0.15, 6.58 ± 0.15, 7.03 ± 0.15 and 7.57 ± 0.18 g m −2 respectively. The biomass sharply increased in the slope of R4, signifying the remarkable adaptation of the denitrification suspended carriers to low temperature through community succession (Liu et al ., 2015). Nevertheless, compared with the biomass in R1, the biomass of the denitrification suspended carriers in R2 only increased by a factor of 4.9% due to the fast‐famine condition that inhibited biofilm growth.…”