title: Quantification of nitrous oxide (N2O) emissions and soluble microbial product (SMP) production by a modified AOB-NOB-N2O-SMP model.
abstract: A modified AOB-NOB-N2O-SMP model able to quantify nitrous oxide (N2O) emissions and soluble microbial product (SMP) production during wastewater treatment is proposed. The modified AOB-NOB-N2O-SMP model takes into account: (1) two-step nitrification by ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), (2) N2O production by AOB denitrification under oxygen-limited conditions and (3) SMP production by microbial growth and endogenous respiration. Validity of the modified model is demonstrated by comparing the simulation results with experimental data from lab-scale sequencing batch reactors (SBRs). To reliably implement the modified model, a model calibration that adjusts model parameters to fit the model outputs to the experimental data is conducted. The results of this study showed that the modeling accuracy of the modified AOB-NOB-N2O-SMP model increases by 19.7% (NH4), 51.0% (NO2), 57.8% (N2O) and 16.7% (SMP) compared to the conventional model which does not consider the two-step nitrification and SMP production by microbial endogenous respiration.
authors.affiliation: Department of Environmental Science and Engineering, Center for Environmental Studies, Kyung Hee University, Yongin 446-701, Republic of Korea; Korea Railroad Research Institute, 76, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, Republic of Korea.
authors.forename: MinJeong
authors.initials: M
authors.lastname: Kim
authors.affiliation: Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, PR China.
authors.forename: Guangxue
authors.initials: G
authors.lastname: Wu
authors.affiliation: Department of Environmental Science and Engineering, Center for Environmental Studies, Kyung Hee University, Yongin 446-701, Republic of Korea. Electronic address: ckyoo@khu.ac.kr.
authors.forename: ChangKyoo
authors.initials: C
authors.lastname: Yoo
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D001419:Bacteria / Q000378:metabolism*; D061249:Batch Cell Culture Techniques; D019149:Bioreactors / Q000382:microbiology; D002138:Calibration; D007700:Kinetics; D008962:Models, Theoretical; D009573:Nitrites / Q000378:metabolism*; D009609:Nitrous Oxide / Q000032:analysis*; D010084:Oxidation-Reduction; D012995:Solubility
chemical_list: D009573:Nitrites; D000641:Ammonia; D009609:Nitrous Oxide
keywords: Activated sludge model; Biological nutrient removal; Nitrous oxide (N(2)O); Soluble microbial products (SMP); Wastewater treatment modeling