Profile of organic carbon and nitrogen removal by a continuous flowing conventional activated sludge reactor with pulse aeration
| Autor: | Yong Zhang, Jiao Chen, Wei Wei, Bao-Cang Han, Wei-Li Jiang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Total organic carbon
Pollutant Environmental Engineering Pulse (signal processing) General Chemical Engineering 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Pulp and paper industry 01 natural sciences Nitrogen Anoxic waters 020801 environmental engineering Denitrifying bacteria Activated sludge chemistry Environmental Chemistry Aeration Safety Risk Reliability and Quality 0105 earth and related environmental sciences |
| Zdroj: | Process Safety and Environmental Protection. 117:439-445 |
| ISSN: | 0957-5820 |
| DOI: | 10.1016/j.psep.2018.05.022 |
| Popis: | This study aimed to investigate the effect of pulse aeration (on/off time 5/10 min) on the pollutants removal efficiencies and on the evolution of the denitrifying bacteria communities of a continuous flowing completely mixed activated sludge reactor. Organic matters and nitrogen removal were evaluated and the denitrifying bacteria community structure was analyzed by MiSeq sequencing technology. Results showed that the TOC removal rates were steadily above 81.6% and the NH4+-N removal rates were 92.1% ± 0.5% when the pulse aerated activated sludge reactor was operated with the optimized pulse aeration cycle (PAC) of 5/10 min. There was no significant impact on both TOC and NH4+-N removal efficiencies, while the average TN removal rate of the pulse aerated reactor (58.4%) was significantly higher than that of the constantly aerated one (30.6%). The removal efficiencies of both organics and nitrogen were stable during the 60-day acclimation period regardless of the changing DO concentration fluctuated in pulse mode. Although the denitrifier bacterial compositions varied between the pulse aerated group and the constantly aerated group, the denitrifier community richness and diversity were similar. Boost of the TN removal was mainly due to the anoxic denitrifying environment provided by the non-aerated phase in each PAC. |
| Databáze: | OpenAIRE |
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