How, Seow Wah and Lim, S.Y. and Lim, P.B. and Aris, A.M. and Ngoh, Gek Cheng and Curtis, Thomas Peter and Chua, Adeline Seak May (2018) Low-dissolved-oxygen nitrification in tropical sewage: an investigation on potential, performance and functional microbial community. Water Science and Technology, 77 (9). pp. 2274-2283. ISSN 0273-1223, DOI https://doi.org/10.2166/wst.2018.143.
Full text not available from this repository.Abstract
Intensive aeration for nitrification is a major energy consumer in sewage treatment plants (STPs). Low-dissolved-oxygen (low-DO) nitrification has the potential to lower the aeration demand. However, the applicability of low-DO nitrification in the tropical climate is not well-understood. In this study, the potential of low-DO nitrification in tropical setting was first examined using batch kinetic experiments. Subsequently, the performance of low-DO nitrification was investigated in a laboratoryscale sequential batch reactor (SBR) for 42 days using real tropical sewage. The batch kinetic experiments showed that the seed sludge has a relatively high oxygen affinity. Thus, the rate of nitrification was not significantly reduced at low DO concentrations (0.5 mg/L). During the operation of the low-DO nitrification SBR, 90% of NH4-N was removed. The active low-DO nitrification was mainly attributed to the limited biodegradable organics in the sewage. Fluorescence in-situ hybridisation and 16S rRNA amplicon sequencing revealed the nitrifiers were related to Nitrospira genus and Nitrosomonadaceae family. Phylogenetic analysis suggests 47% of the operational taxonomic units in Nitrospira genus are closely related to a comammox bacteria. This study has demonstrated active low-DO nitrification in tropical setting, which is a more sustainable process that could significantly reduce the energy footprint of STPs.
| Item Type: | Article |
|---|---|
| Funders: | Royal Society, Academy of Sciences Malaysia and Malaysian Industry-Government Group for High Technology (MIGHT): Newton Advanced Fellowship |
| Uncontrolled Keywords: | activated sludge; ammonia-oxidising bacteria; biological nitrogen removal; nitrification; Nitrospira; tropical climate |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology |
| Divisions: | Faculty of Engineering |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 07 Aug 2019 05:00 |
| Last Modified: | 07 Aug 2019 05:00 |
| URI: | http://eprints.um.edu.my/id/eprint/21859 |
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