Role of free nitrous acid in wastewater treatment processes : action and inhibition
In modern wastewater treatment plants (WWTPs), enhanced biological phosphorus removal (EBPR) is typically combined with nitrogen removal. Nitrite, an intermediate of nitrification and denitrification, can accumulate in the system under certain environmental conditions. However, free nitrous acid (FN...
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| Format: | Thesis |
| Language: | English |
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2015
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| Online Access: | https://hdl.handle.net/10356/62143 |
| _version_ | 1826122202290847744 |
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| author | Ganda, Lily |
| author2 | Liu Yu |
| author_facet | Liu Yu Ganda, Lily |
| author_sort | Ganda, Lily |
| collection | NTU |
| description | In modern wastewater treatment plants (WWTPs), enhanced biological phosphorus removal (EBPR) is typically combined with nitrogen removal. Nitrite, an intermediate of nitrification and denitrification, can accumulate in the system under certain environmental conditions. However, free nitrous acid (FNA), a protonated form of nitrite, has been known to inhibit various microorganisms in WWTP, including poly-phosphate accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs), the two functional groups of microorganisms competing in EBPR system. This study investigated the inhibitory effects of FNA on the key metabolisms of PAO and GAO as well as the inhibition reversibility. Different response of PAOs and GAOs to FNA was obtained, wherein GAOs were unable to utilize nitrite as electron acceptor as opposed to PAOs, suggesting that FNA can be used as a strategic tool to manipulate the microbial community structure in the EBPR system towards PAO enrichment, as also subsequently demonstrated in this thesis. |
| first_indexed | 2024-10-01T05:44:37Z |
| format | Thesis |
| id | ntu-10356/62143 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:44:37Z |
| publishDate | 2015 |
| record_format | dspace |
| spelling | ntu-10356/621432023-03-03T19:22:44Z Role of free nitrous acid in wastewater treatment processes : action and inhibition Ganda, Lily Liu Yu Ng Wun Jern School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute DRNTU::Engineering::Environmental engineering::Water treatment In modern wastewater treatment plants (WWTPs), enhanced biological phosphorus removal (EBPR) is typically combined with nitrogen removal. Nitrite, an intermediate of nitrification and denitrification, can accumulate in the system under certain environmental conditions. However, free nitrous acid (FNA), a protonated form of nitrite, has been known to inhibit various microorganisms in WWTP, including poly-phosphate accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs), the two functional groups of microorganisms competing in EBPR system. This study investigated the inhibitory effects of FNA on the key metabolisms of PAO and GAO as well as the inhibition reversibility. Different response of PAOs and GAOs to FNA was obtained, wherein GAOs were unable to utilize nitrite as electron acceptor as opposed to PAOs, suggesting that FNA can be used as a strategic tool to manipulate the microbial community structure in the EBPR system towards PAO enrichment, as also subsequently demonstrated in this thesis. Doctor of Philosophy (CEE) 2015-01-21T08:44:16Z 2015-01-21T08:44:16Z 2014 2014 Thesis Ganda, L. (2014). Role of free nitrous acid in wastewater treatment processes : action and inhibition. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/62143 10.32657/10356/62143 en 133 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Environmental engineering::Water treatment Ganda, Lily Role of free nitrous acid in wastewater treatment processes : action and inhibition |
| title | Role of free nitrous acid in wastewater treatment processes : action and inhibition |
| title_full | Role of free nitrous acid in wastewater treatment processes : action and inhibition |
| title_fullStr | Role of free nitrous acid in wastewater treatment processes : action and inhibition |
| title_full_unstemmed | Role of free nitrous acid in wastewater treatment processes : action and inhibition |
| title_short | Role of free nitrous acid in wastewater treatment processes : action and inhibition |
| title_sort | role of free nitrous acid in wastewater treatment processes action and inhibition |
| topic | DRNTU::Engineering::Environmental engineering::Water treatment |
| url | https://hdl.handle.net/10356/62143 |
| work_keys_str_mv | AT gandalily roleoffreenitrousacidinwastewatertreatmentprocessesactionandinhibition |