Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure
Nitrogen removal via anammox is a promising and sustainable solution in mainstream wastewater treatment. To maintain stable anammox process, competitors of anammox bacteria should be suppressed while cooperators need to be favoured. This study demonstrated a synchronous aerobic and anaerobic ammoniu...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/159717 |
| _version_ | 1826115539390431232 |
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| author | Chen, Rongfen Zhou, Yan |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Chen, Rongfen Zhou, Yan |
| author_sort | Chen, Rongfen |
| collection | NTU |
| description | Nitrogen removal via anammox is a promising and sustainable solution in mainstream wastewater treatment. To maintain stable anammox process, competitors of anammox bacteria should be suppressed while cooperators need to be favoured. This study demonstrated a synchronous aerobic and anaerobic ammonium removal process in a membrane aerated biofilm reactor (MABR) under minimal lumen pressure. By adjusting the lumen pressure, aerobic and anaerobic ammonium oxidation rate can be synchronized to minimize interference of nitrite oxidizing bacteria (NOB) by limiting NOB's access to both oxygen and nitrite. Long-term performance indicated that PN/A in MABR could be achieved at zero positive aeration pressure. Furthermore, by connecting two MABRs in series, high total nitrogen (TN) removal efficiency of 71.1% ± 5.3% was attained with a TN removal rate of 30.1 ± 3.2 mg-N/L/d. The organic carbon present in the wastewater reduced the nitrate concentration in the effluent while not affecting the overall nitrogen removal efficiency and rate. Real-time qPCR analysis suggested that the abundance of amoA gene was relatively stable while K-strategist Nitrospira 16S rRNA gene did not surge in the long-term operation. High throughput sequencing showed that Candidatus Brocadia and uncultured anaerobic ammonium oxidizing bacteria from Chloroflexi were the most abundant anammox taxa. Denitrifiers, such as Denitratisoma may be responsible to reduce the nitrate in the effluent. |
| first_indexed | 2024-10-01T03:56:50Z |
| format | Journal Article |
| id | ntu-10356/159717 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:56:50Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1597172022-06-29T07:18:18Z Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure Chen, Rongfen Zhou, Yan School of Civil and Environmental Engineering Interdisciplinary Graduate School (IGS) Nanyang Environment and Water Research Institute Advanced Environmental Biotechnology Centre (AEBC) Engineering::Environmental engineering Membrane Aerated Biofilm Reactor Selective NOB Suppression Nitrogen removal via anammox is a promising and sustainable solution in mainstream wastewater treatment. To maintain stable anammox process, competitors of anammox bacteria should be suppressed while cooperators need to be favoured. This study demonstrated a synchronous aerobic and anaerobic ammonium removal process in a membrane aerated biofilm reactor (MABR) under minimal lumen pressure. By adjusting the lumen pressure, aerobic and anaerobic ammonium oxidation rate can be synchronized to minimize interference of nitrite oxidizing bacteria (NOB) by limiting NOB's access to both oxygen and nitrite. Long-term performance indicated that PN/A in MABR could be achieved at zero positive aeration pressure. Furthermore, by connecting two MABRs in series, high total nitrogen (TN) removal efficiency of 71.1% ± 5.3% was attained with a TN removal rate of 30.1 ± 3.2 mg-N/L/d. The organic carbon present in the wastewater reduced the nitrate concentration in the effluent while not affecting the overall nitrogen removal efficiency and rate. Real-time qPCR analysis suggested that the abundance of amoA gene was relatively stable while K-strategist Nitrospira 16S rRNA gene did not surge in the long-term operation. High throughput sequencing showed that Candidatus Brocadia and uncultured anaerobic ammonium oxidizing bacteria from Chloroflexi were the most abundant anammox taxa. Denitrifiers, such as Denitratisoma may be responsible to reduce the nitrate in the effluent. 2022-06-29T07:18:17Z 2022-06-29T07:18:17Z 2022 Journal Article Chen, R. & Zhou, Y. (2022). Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure. The Science of the Total Environment, 818, 151758-. https://dx.doi.org/10.1016/j.scitotenv.2021.151758 0048-9697 https://hdl.handle.net/10356/159717 10.1016/j.scitotenv.2021.151758 34801505 2-s2.0-85119651971 818 151758 en The Science of the Total Environment © 2021 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering Membrane Aerated Biofilm Reactor Selective NOB Suppression Chen, Rongfen Zhou, Yan Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure |
| title | Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure |
| title_full | Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure |
| title_fullStr | Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure |
| title_full_unstemmed | Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure |
| title_short | Mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure |
| title_sort | mainstream nitrogen removal in membrane aerated biofilm reactor at minimal lumen pressure |
| topic | Engineering::Environmental engineering Membrane Aerated Biofilm Reactor Selective NOB Suppression |
| url | https://hdl.handle.net/10356/159717 |
| work_keys_str_mv | AT chenrongfen mainstreamnitrogenremovalinmembraneaeratedbiofilmreactoratminimallumenpressure AT zhouyan mainstreamnitrogenremovalinmembraneaeratedbiofilmreactoratminimallumenpressure |