pH-gradient real-time aeration control for nitritation community selection in a non-porous hollow fiber membrane biofilm reactor (MBfR) with dilute wastewater.
pH-gradient real-time aeration control for nitritation community selection in a non-porous hollow fiber membrane biofilm reactor (MBfR) with dilute wastewater.
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DOI：
10.1016/j.chemosphere.2012.10.061
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发表时间：
2013-02
期刊：
影响因子：
8.8
通讯作者：
Po-Heng Lee;Samuel F Cotter;Silvia C Reyes Prieri;Dinu S. Attalage;S. Sung
中科院分区：
文献类型：
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作者：
Po-Heng Lee;Samuel F Cotter;Silvia C Reyes Prieri;Dinu S. Attalage;S. Sung
亚硝酸化（铵至亚硝酸盐）作为Anammox（厌氧铵氧化）的预处理，是稀废水（例如经厌氧处理的污水）中节能脱氮替代方案的关键步骤，有限的研究已经实现了可持续的亚硝酸化环境温度和短水力停留时间。为此，在20°C下以序批式模式观察氧基膜生物膜反应器中的pH梯度实时曝气控制。确定了氨氧化菌（AOB）的最适扩散供氧条件，而亚硝酸盐氧化菌（NOB）则受到抑制。该系统实现了亚硝酸盐的积累效率从88%到94%的曝气控制。质量平衡和速率性能分析表明，这种曝气控制能够提供1.5mol O2mol− 1铵进料的氧速率，这是基于亚硝化群落选择的化学计量的基准氧速率。微生物分析证实了在该通风控制下AOB的流行与NOB的抑制。
Nitritation (ammonium to nitrite) as a pre-treatment of Anammox (anaerobic ammonium oxidation) is a key step for an energy-efficient nitrogen-removal alternative from dilute wastewaters, e.g. anaerobically-treated sewage, with which limited study has achieved sustainable nitritation at ambient temperature and short hydraulic retention times. To this end, pH-gradient real-time aeration control in an oxygen-based membrane biofilm reactor was observed at 20°C in the sequencing batch mode. An optimum oxygen supply via diffusion for ammonium-oxidizing bacteria (AOB) was established, but nitrite-oxidizing bacteria (NOB) could be inhibited. The system achieved nitrite accumulation efficiencies varying from 88% to 94% with the aeration control. Mass balance and rate performance analyses indicate that this aeration control is able to supply an oxygen rate of 1.5mol O2mol−1ammonium fed, the benchmark oxygenation rate based on stoichiometry for nitritation community selection. Microbial analyses confirmed AOB prevalence with NOB inhibition under this aeration control.