How, Seow Wah and Shoji, Tadashi and Tan, Chee Keong and Curtis, Thomas P. and Chua, Adeline Seak May (2021) Kinetic characterization of a low-dissolved-oxygen oxic-anoxic process treating low COD/N tropical wastewater revealed selection of nitrifiers with high substrate affinity. Journal of Water Process Engineering, 43. ISSN 2214-7144, DOI https://doi.org/10.1016/j.jwpe.2021.102235.
Full text not available from this repository.Abstract
The design of wastewater treatment plants in the tropics is largely based on default parameters from the studies in temperate climates. This may lead to suboptimal design, such as the intensive aeration required for biological nitrogen removal. To reduce the aeration energy, a low-dissolved-oxygen oxic-anoxic (low-DO OA) process was developed for treating low chemical oxygen demand-to-nitrogen (COD/N) tropical wastewater. This study calibrated the growth kinetic parameters of microbes in a conventional anoxic-oxic (AO) and a low-DO OA sequencing batch reactors (SBRs) based on a modified version of Activated Sludge Model No. 1 (ASM1). We selected three parameters to be calibrated, namely the maximum growth rate of heterotrophs (mu(H)), maximum growth rate of nitrifiers (mu(A)) and nitrifiers' affinity towards ammoniacal nitrogen (NH4+ -N) (KNH). The low-DO OA SBR selected for microbes with a low mu(H) (2.2 d(-1)), mu A (1.49 d-1) and KNH (0.035 mg NH4+ -N L-1), which supported the observed proliferation of K-strategist Nitrospira at low-DO condition (0.4 +/- 0.2 mg O-2 L-1). The calibrated parameters for the AO SBR (1.7 +/- 0.2 mg O-2 L-1) were significantly higher (mu H=9.3 d(-1), mu A=4.49 d(-1), KNH=6.3 mg NH4+ -N L-1) than the low-DO OA SBR. The calibrated ASM1 adequately simulated the low-DO OA SBR performance under different sludge retention times. The findings demonstrated a kinetic insight into the unique K-strategist nitrifiers in a low-DO OA process. Moreover, this study reinforced the importance of using parameters for tropical wastewater rather than relying on default values from studies in temperate climates.
| Item Type: | Article |
|---|---|
| Funders: | Newton Fund Impact Scheme (NFIS) grant under the Newton-Ungku Omar Fund (536710788/IF024-2020), Malaysian Industry-Government Group for High Technology (MIGHT), UK UK Department for Business, Energy and Industrial Strategy, Research University Faculty Program Grant by the Ministry of Higher Education Malaysia (GPF024A-2019) |
| Uncontrolled Keywords: | Activated sludge model; Calibration; Maximum growth rate; Nitrification; Nitrospira |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology |
| Divisions: | Faculty of Engineering > Department of Chemical Engineering |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 20 Jun 2022 08:11 |
| Last Modified: | 20 Jun 2022 08:11 |
| URI: | http://eprints.um.edu.my/id/eprint/27968 |
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