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篇目详细内容 |
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【篇名】 |
Short-term effects of excessive anaerobic reaction time on anaerobic metabolism of denitrifying polyphosphate- accumulating organisms linked to phosphorus removal and N2O production |
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【刊名】 |
Frontiers of Environmental Science and Engineering in China |
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【刊名缩写】 |
Front.Environ.Sci.Engin.China |
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【ISSN】 |
2095-2201 |
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【EISSN】 |
2095-221X |
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【DOI】 |
10.1007/s11783-013-0505-4 |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2013 |
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【卷期】 |
7
卷4期 |
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【页码】 |
616-624
页,共
9
页 |
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【作者】 |
Gang GUO;
Yayi WANG;
Chong WANG;
Hong WANG;
Mianli PAN;
Shaowei CHEN;
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【关键词】 |
Denitrifying phosphorus removal; anaerobic reaction time; nitrous oxide; polyhydroxyalkanoate; free nitrous acid; fluorescence in-situ hybridization |
【摘要】 |
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The short-term effect of anaerobic reaction time (AnRT) (i.e., 90, 120 and 150？min) on the denitrifying phosphorus (P) removal performance and N2O production was examined using a denitrifying enhanced biologic phosphorus removal (EBPR) sludge acclimatized with mixed acetate (HAc) and propionate (Pro) (in the molar ratio 3∶1) as carbon sources. The results showed that when the AnRT was prolonged from 90 to 150？min, the anaerobic polyhydroxyalkanoate (PHA) synthesis was decreased by 15.3%. Moreover, the ineffective PHA consumption occurred in anaerobic phases and contributed to an increased accumulation and higher free nitrous acid (FNA) concentrations (≥0.001–0.0011？ mg HNO2？N/L) in the subsequent anoxic phases, causing a severe inhibition on anoxic P-uptake and denitrification. Accordingly, the total nitrogen (TN) and total phosphorus (TP) removal efficiencies dropped by approximately 6.3% and 85.5%, respectively; and the ratio of anoxic N2O？N production to TN removal increased by approximately 3.8%. The fluorescence in situ hybridization (FISH) analysis revealed that the sludge was mainly dominated by Accumulibacter (62.0% (SEmean = 1.5%)). In conclusion, the short-term excessive anaerobic reaction time negatively impacted denitrifying P removal performance and stimulated more N2O production, and its effect on P removal was more obvious than that on nitrogen removal. |
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