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An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure

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...

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主要な著者: How, Seow Wah, Nittami, Tadashi, Ngoh, Gek Cheng, Curtis, Thomas P., Chua, Adeline Seak May
フォーマット: 論文
出版事項: Elsevier 2020
主題:
T Technology (General)
TP Chemical technology
オンライン･アクセス:http://eprints.um.edu.my/36290/
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spelling my.um.eprints.362902023-11-29T12:42:57Z http://eprints.um.edu.my/36290/ An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure How, Seow Wah Nittami, Tadashi Ngoh, Gek Cheng Curtis, Thomas P. Chua, Adeline Seak May T Technology (General) TP Chemical technology 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. Elsevier 2020-11 Article PeerReviewed 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 <https://doi.org/10.1016/j.chemosphere.2020.127444>. 10.1016/j.chemosphere.2020.127444
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic T Technology (General)
TP Chemical technology
spellingShingle T Technology (General)
TP Chemical technology
How, Seow Wah
Nittami, Tadashi
Ngoh, Gek Cheng
Curtis, Thomas P.
Chua, Adeline Seak May
An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure
description 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.
format Article
author How, Seow Wah
Nittami, Tadashi
Ngoh, Gek Cheng
Curtis, Thomas P.
Chua, Adeline Seak May
author_facet How, Seow Wah
Nittami, Tadashi
Ngoh, Gek Cheng
Curtis, Thomas P.
Chua, Adeline Seak May
author_sort How, Seow Wah
title An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure
title_short An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure
title_full An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure
title_fullStr An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure
title_full_unstemmed An efficient oxic-anoxic process for treating low COD/N tropical wastewater: Startup, optimization and nitrifying community structure
title_sort efficient oxic-anoxic process for treating low cod/n tropical wastewater: startup, optimization and nitrifying community structure
publisher Elsevier
publishDate 2020
url http://eprints.um.edu.my/36290/
_version_ 1783945853003628544
score 13.251813

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