Highlights•Biological nitrogen removal and recovery approaches are reviewed.•Anammox
saves energy in side-stream treatment and is progressing toward mainstream.•Phototrophic …

Direct nitrous oxide (N 2 O) emissions during the biological nitrogen removal (BNR)
processes can significantly increase the carbon footprint of wastewater treatment plant …

Nitrous oxide (N2O) emissions account for the majority of the carbon footprint of wastewater
treatment plants (WWTPs). Many N2O mitigation strategies have since been developed …

Extensive growth of industries leads to uncontrolled ammonia releases to environment. This
can result in significant degradation of the aquatic ecology as well as significant health …

Mitigation of nitrous oxide (N 2 O) emissions is of primary importance to meet the targets of
reducing carbon footprints of wastewater treatment plants (WWTPs). Despite of a large …

Simultaneous nitrification and denitrification (SND) is an energy-saving wastewater
treatment process, however, the nitrogen removal pathways are not clear. An enhanced …

Partial nitritation-anammox (PN-A) process, which significantly reduces energy and
chemical input compared to the conventional biological nitrogen removal process, is a game …

Aerobic granular sludge sequencing batch reactor (AGSBR) is a promising approach for
wastewater treatment. In the paper, the effects of methanol, starch and sucrose as carbon …

A multiple bio-cathodes constructed wetland-microbial fuel cell (CW-MFC) system, aiming
for higher power production and therefore the improved N removal, was investigated in this …

Bacterial species capable of performing both nitrification and denitrification in a single
vessel under similar conditions have gained significance in the wastewater treatment …