Biological Nitrogen Removal Database

A manually curated data resource for microbial nitrogen removal


Comammox


Experimental setup


Influent:Synthetic wastewater simulating municipal wastewater

Comammox System:Intermittently aerated SBR

reactor:Sequencing batch reactor

Medium:Suspended-sludge

Culture taken from:Seeding sludge was taken from a full-scale municipal WWTP

Microorganism cultured:nan

Respiration:Aerobic

Electron donor:Polyhydroxyalkanoates

Electron acceptor:Ammonium, nitrite

PH:7.6-8.2

Temperature:25?C

HRT:8 h and 20 days

NH4–N Influent conc(mg/L):50

NO2–N Influent conc(mg/L):50.0

NO3–N Influent conc(mg/L):nan


Experimental Information


NH4–N Effluent (mg N/L):25

NO2–N Effluent (mg N/L):16.0

NO3-N Effluent (mg N/L):4

NH4–N removal rate mg/L/d:27.31

NO2–N removal rate mg/L/d:3.6

NO3-N removal rate mg/L/d:nan

TN Removal rate (mg N/L/d):nan


Information about Article


Authors:Liu et al., 2021

Title:Minimization of N2O Emission through Intermittent Aeration in a Sequencing Batch Reactor (SBR): Main Behavior and Mechanism

Pubmed link:None

Full research link:Link

Abstract:To explore the main behavior and mechanism of minimizing nitrous oxide (N2O) emission through intermittent aeration during wastewater treatment, two lab-scale sequencing batch reactors operated at intermittently aerated mode (SBR1), and continuously aerated mode (SBR2) were established. Compared with SBR2, the intermittently aerated SBR1 reached not only a higher total nitrogen removal efficiency (averaged 93.5%) but also a lower N2O-emission factor (0.01–0.53% of influent ammonia), in which short-cut nitrification and denitrification were promoted. Moreover, less accumulation and consumption of polyhydroxyalkanoates, a potential endogenous carbon source promoting N2O emission, were observed in SBR1. Batch experiments revealed that nitrifier denitrification was the major pathway generating N2O while heterotrophic denitrification played as a sink of N2O, and SBR1 embraced a larger N2O-mitigating capability. Finally, quantitative polymerase chain reaction results suggested that the abundant complete ammonia oxidizer (comammox) elevated in the intermittently aerated environment played a potential role in avoiding N2O generation during wastewater treatment. This work provides an in-depth insight into the utilization of proper management of intermittent aeration to control N2O emission from wastewater treatment plants.