Activated sludge operational regime has significant impact on the type of nitrifying community and its nitrification rates

Nitrifier characteristics in submerged membrane bioreactors under different sludge retention times

“…which both belong to the Betaproteobacteria (Fig. 7) and are important AOB in activated sludge systems (Dytczak et al, 2008). However, the distribution of them in three MBRs was quite different.…”

Simultaneous Nitrification and Denitrification in an SBR with a Modified Cycle During Reject Water Treatment

“…Similar nitrifi cation rate (6.16 mg N-NH 4 /(g VSS·h)) under alternating anaerobic/aerobic conditions was obtained in SBR by Dytczak et al [7]. The rate was higher than the one observed under strictly aerobic conditions (2.95 mg N-NH 4 /(g VSS⋅h)), since rapid-nitrifi ers such as Nitrosomonas and Nitrobacter (79.5% of the nitrifying population) dominated in the alternating reactor, while the dominance of slower nitrifi ers such as Nitrosospira and Nitrospira (78.2%) was noted in the strictly aerobic reactor [6]. Ling Chen [11] studied the nitrifi cation rate as a function of the total ammonium concentration, with and without the interaction of organic matter, in fl oating bed, fl uidized sand and submerged bio-cube fi lters.…”

- Assessing Bacterial Diversity in a Seawater-Processing Wastewater Treatment Plant by 454-Pyrosequencing of the 16S rRNA and amoA Genes

“…Although microbial communities of activated sludge in WWTPs have been intensively studied [5][6][7][8][9][10][11], most of such efforts have been focused only on microbial phylogenetic composition. Knowledge is still lacking in regard to microbial community functional structures and their linkages to environmental variables.…”