Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor
This study investigated the initiation and maintenance of nitritation in a membrane bioreactor (MBR) with long solids retention time (SRT) of 43.8 days. Nitritation was initiated within 65 days in the MBR via dissolved oxygen (DO) limitation (<0.5 mg/L). However, nitrite oxidizing bacteria (NOB)...
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| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/152727 |
| _version_ | 1811697515889688576 |
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| author | Jiang, Yishuai Poh, Leong Soon Lim, Choon-Ping Ng, Wun Jern |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Jiang, Yishuai Poh, Leong Soon Lim, Choon-Ping Ng, Wun Jern |
| author_sort | Jiang, Yishuai |
| collection | NTU |
| description | This study investigated the initiation and maintenance of nitritation in a membrane bioreactor (MBR) with long solids retention time (SRT) of 43.8 days. Nitritation was initiated within 65 days in the MBR via dissolved oxygen (DO) limitation (<0.5 mg/L). However, nitrite oxidizing bacteria (NOB) (Nitrospira and Nitrobacter) acclimated to the low DO environment and proliferated from day 81, leading to nitrate accumulation. Thereafter, the combined strategy of DO limitation and in-situ generated free nitrous acid (FNA) shock successfully restored and maintained stable nitritation for >70 days. Quantitative polymerase chain reaction (qPCR) results showed that cell abundances of Nitrospira and Nitrobacter decreased by between 50.0 to 68.9% and 60.6 to 96.4%, respectively following the FNA shocks. The maximum ammonium loading rate achieved was 1.81 kg N/(m3 day) with ammonium removal ratio and nitrite accumulation ratio of over 0.97 and 0.96, respectively. Average emission rate of N2O from the MBR was 2.1 ± 0.72% of ammonium removed. FNA shock on day 195 reduced the N2O emission by 13.6%. The strategy developed in this study verified that spiked FNA shock together with DO limitation can be used for maintaining nitritation in MBRs with long SRTs. This method can potentially allow for maintaining nitritation at relatively low capital and operating expenditure when treating high concentration ammonium wastewater. |
| first_indexed | 2024-10-01T07:56:29Z |
| format | Journal Article |
| id | ntu-10356/152727 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:56:29Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1527272021-09-20T02:26:46Z Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor Jiang, Yishuai Poh, Leong Soon Lim, Choon-Ping Ng, Wun Jern School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Advanced Environmental Biotechnology Centre (AEBC) Engineering::Environmental engineering Nitritation Membrane Bioreactor This study investigated the initiation and maintenance of nitritation in a membrane bioreactor (MBR) with long solids retention time (SRT) of 43.8 days. Nitritation was initiated within 65 days in the MBR via dissolved oxygen (DO) limitation (<0.5 mg/L). However, nitrite oxidizing bacteria (NOB) (Nitrospira and Nitrobacter) acclimated to the low DO environment and proliferated from day 81, leading to nitrate accumulation. Thereafter, the combined strategy of DO limitation and in-situ generated free nitrous acid (FNA) shock successfully restored and maintained stable nitritation for >70 days. Quantitative polymerase chain reaction (qPCR) results showed that cell abundances of Nitrospira and Nitrobacter decreased by between 50.0 to 68.9% and 60.6 to 96.4%, respectively following the FNA shocks. The maximum ammonium loading rate achieved was 1.81 kg N/(m3 day) with ammonium removal ratio and nitrite accumulation ratio of over 0.97 and 0.96, respectively. Average emission rate of N2O from the MBR was 2.1 ± 0.72% of ammonium removed. FNA shock on day 195 reduced the N2O emission by 13.6%. The strategy developed in this study verified that spiked FNA shock together with DO limitation can be used for maintaining nitritation in MBRs with long SRTs. This method can potentially allow for maintaining nitritation at relatively low capital and operating expenditure when treating high concentration ammonium wastewater. Ministry of Education (MOE) This study was funded by Academic Research Fund Tier 2, Ministry of Education, Singapore, grant number MOE2014-T2-1-029. 2021-09-20T02:26:46Z 2021-09-20T02:26:46Z 2019 Journal Article Jiang, Y., Poh, L. S., Lim, C. & Ng, W. J. (2019). Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor. Science of the Total Environment, 660, 11-17. https://dx.doi.org/10.1016/j.scitotenv.2019.01.024 0048-9697 https://hdl.handle.net/10356/152727 10.1016/j.scitotenv.2019.01.024 30639708 2-s2.0-85059572709 660 11 17 en MOE2014-T2-1-029 Science of the Total Environment © 2019 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering Nitritation Membrane Bioreactor Jiang, Yishuai Poh, Leong Soon Lim, Choon-Ping Ng, Wun Jern Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor |
| title | Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor |
| title_full | Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor |
| title_fullStr | Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor |
| title_full_unstemmed | Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor |
| title_short | Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor |
| title_sort | impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor |
| topic | Engineering::Environmental engineering Nitritation Membrane Bioreactor |
| url | https://hdl.handle.net/10356/152727 |
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