State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai 200092, PR China.
Bioresour Technol. 2011 May;102(10):5674-84. doi: 10.1016/j.biortech.2011.02.080. Epub 2011 Feb 22.
Nitrous oxide (N(2)O) is a highly potent greenhouse gas; however, the characteristics of N(2)O production during denitrification using poly-β-hydroxyalkanoates (PHA) as a carbon source are not well understood. In this study, effects of anaerobic reaction time (AnRT) on PHA formation, denitrifying phosphorus removal and N(2)O production were investigated using a laboratory-scale anaerobic/anoxic/oxic sequencing batch reactor (An/A/O SBR). The results showed that operation of the An/A/O SBR for 0.78 SRT (47 cycles) after the AnRT was shortened from 90 min to 60 min resulted in anaerobically synthesized PHA improving by 1.8 times. This improvement was accompanied by increased phosphorus removal efficiency and denitrification. Accordingly, the N(2)O-N production was reduced by 6.7 times. Parallel batch experiments were also conducted with AnRTs of 60, 90 and 120 min. All results indicated that in addition to the amount of anaerobically synthesized PHA, the kinetics of PHA degradation also regulated denitrifying phosphorus removal and N(2)O production.
一氧化二氮（N(2)O）是一种高活性温室气体；然而，利用聚β-羟基烷酸酯（PHA）作为碳源进行反硝化时 N(2)O 产生的特性尚未得到很好的理解。在这项研究中，采用实验室规模的厌氧/缺氧/好氧序批式反应器（An/A/O SBR）考察了厌氧反应时间（AnRT）对 PHA 形成、反硝化除磷和 N(2)O 产生的影响。结果表明，将 AnRT 从 90min 缩短至 60min 后，An/A/O SBR 的运行时间（SRT）从 0.78 SRT（47 个周期）缩短，结果导致厌氧合成的 PHA 提高了 1.8 倍。这种改善伴随着除磷效率和反硝化作用的提高。相应地，N(2)O-N 的产生减少了 6.7 倍。还进行了 AnRT 为 60、90 和 120min 的平行批处理实验。所有结果表明，除了厌氧合成的 PHA 量之外，PHA 降解的动力学也调节了反硝化除磷和 N(2)O 的产生。
