Impact of free nitrous acid shock and dissolved oxygen limitation on nitritation maintenance and nitrous oxide emission in a membrane bioreactor
| Autor: | Leong Soon Poh, Yishuai Jiang, Choon-Ping Lim, Wun Jern Ng |
|---|---|
| Přispěvatelé: | School of Civil and Environmental Engineering, Nanyang Environment and Water Research Institute, Advanced Environmental Biotechnology Centre (AEBC) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Time Factors
Environmental Engineering 010504 meteorology & atmospheric sciences Membrane Bioreactor Nitrous Oxide Nitrobacter Wastewater 010501 environmental sciences Membrane bioreactor Waste Disposal Fluid 01 natural sciences chemistry.chemical_compound Bioreactors Ammonium Compounds Environmental Chemistry Ammonium Nitrite Waste Management and Disposal 0105 earth and related environmental sciences Nitrous acid Chromatography Bacteria biology Nitrous oxide biology.organism_classification Pollution Environmental engineering [Engineering] Oxygen Nitritation chemistry Nitrospira |
| Popis: | 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 (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. |
| Databáze: | OpenAIRE |
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