Sustainable nitrogen removal in anammox-mediated systems: Microbial metabolic pathways, operational conditions and mathematical modelling

How to Provide Nitrite Robustly for Anaerobic Ammonium Oxidation in Mainstream Nitrogen Removal

“…When in comparison with heterotrophic denitrifiers, the cooperation between DAMO microbes and AnAOB can further decrease the N 2 O production due to the lack of norz enzyme for reducing NO to N 2 O in both ANME archaea and NC10 bacteria. 58,122,190,205 In a lab-scale mainstream n-DAMO/A process, the N 2 O emission factor was only 0.34 ± 0.01% of the influent TN, 206 which is much lower than PD/A processes of 1.43%. 199 Currently, nitrite supply to anammox by autotrophic denitrification gains more interest for its advantage in mitigating GHG emissions including N 2 O emissions.…”

“…136 In previous studies, anammox with nitrite supply pathways by nitrate reduction can mitigate the N 2 O emission compared to conventional nitrification and denitrification. 58,204 Cao et al 204 observed a low N 2 O accumulation (0.031−0.053 mg N/ L) in a PD effluent, and the heterotrophic denitrifiers coexisting with AnAOB would reduce the dissolved N 2 O amount in anammox effluent (0.027−0.041 mg N/L). When in comparison with heterotrophic denitrifiers, the cooperation between DAMO microbes and AnAOB can further decrease the N 2 O production due to the lack of norz enzyme for reducing NO to N 2 O in both ANME archaea and NC10 bacteria.…”

Diving boldly into COVID‐19 contaminated wastewater: Eyes at nanotechnology‐assisted solutions

“…The critical aim of wastewater treatment is to eliminate organic matter and remove nutrients (S, N and P), suspended solids, and soluble contaminants from wastewater 104–108 . At all events, the wastewater treatment processes consist of the physical processes (primary treatment), biological processes (secondary treatment), flocculation sedimentation, sand filtration, and membrane filtration efficient as the physiochemical process (tertiary treatment) for pathogen removal from wastewater.…”

“…The critical aim of wastewater treatment is to eliminate organic matter and remove nutrients (S, N and P), suspended solids, and soluble contaminants from wastewater. [104][105][106][107][108] At all events, the wastewater treatment processes consist of the physical processes (primary treatment), biological processes (secondary treatment), flocculation sedimentation, sand filtration, and membrane filtration efficient as the physiochemical process (tertiary treatment) for pathogen removal from wastewater. Additionally, based on, 109 it is important to highlight that the approaches, all of which use sand filters for infection removal in the handwash-wastewater treatment of COVID-19, will become more efficient if the use of biological processes and/or physical filtration is made.…”

Promotion of the start-up of the anammox reactor with exogenous boron

“…[1][2][3][4][5] However, the slow growth rate (doubling time is about 11 days) and strict metabolic conditions of anammox bacteria create considerable difficulty for the start-up of an anammox reactor. [6][7][8] Maintaining viable biomass is essential in the start-up of an anammox process. Anammox bacteria tend to inhabit the aggregates with an optimum temperature of 30-35 °C, and thus the granulation of anammox bacteria is considered an effective way to maintain high anammox biomass in the reactor.…”