How, Seow Wah and Nittami, Tadashi and Ngoh, Gek Cheng and Curtis, Thomas P. and Chua, Adeline Seak May (2020) An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure. Chemosphere, 259. ISSN 0045-6535, DOI https://doi.org/10.1016/j.chemosphere.2020.127444.
Full text not available from this repository.Abstract
In this study, we assessed and optimized a low-dissolved-oxygen oxic-anoxic (low-DO OA) process to achieve a low-cost and sustainable solution for wastewater treatment systems in the developing tropical countries treating low chemical oxygen demand-to-nitrogen ratio (COD/N) wastewater. The low-DO OA process attained complete ammonia removal and the effluent nitrate nitrogen (NO3-N) was below 0.3 mg/L. The recommended hydraulic retention time and sludge retention time (SRT) were 16 h and 20 days, respectively. The 16S rRNA sequencing data revealed that long SRT (20 days) encouraged the growth of nitrite-oxidizing bacteria (NOB) affiliated with ``Candidatus Nitrospira defluvii''. Comammox made up 10-20% of the Nitrospira community. NOB and comammox related to Nitrospira were enriched at long SRT (20 days) to achieve good low-DO nitrification performance. The low-DO OA process was efficient and has simpler design than conventional processes, which are keys for sustainable wastewater treatment systems in the developing countries treating low COD/N wastewater. (C) 2020 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Ammonia-oxidizing bacteria; Biological nitrogen removal; Comammox; Nitrite-oxidizing bacteria; Nitrospira; Post-anoxic |
| Subjects: | T Technology > T Technology (General) T Technology > TP Chemical technology |
| Divisions: | Faculty of Engineering Faculty of Engineering > Department of Chemical Engineering |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 29 Nov 2023 12:42 |
| Last Modified: | 29 Nov 2023 12:42 |
| URI: | http://eprints.um.edu.my/id/eprint/36290 |
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