通过膜充气生物膜反应器在中等腔压下实现同时硝化和反硝化

Huiyun Zhong, Yuanyuan Tang, Mengyu Wang, Liangfei Dong
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摘要

要在膜充气生物膜反应器(MABR)中实现同时硝化和反硝化(SND),内腔压力至关重要;因此,在本研究中,实验室规模的 MABR 在不同的内腔压力(7 kPa、10 kPa、13 kPa 和 16 kPa)下连续运行,以验证其对脱氮的影响。结果表明,在 7 千帕压力下,由于供氧不足,NH4+-N 氧化作用不足,而在 16 千帕压力下,反硝化作用受到抑制。总脱氮效率在 10 千帕和 13 千帕下相似(约 78.9%),远高于 7 千帕和 16 千帕下(约 50%)。生物量密度(22.35 克/平方米)和生物膜厚度(500.3 微米)在 13 千帕时最高,EPS 随腔压的增加而分泌。亚硝化细菌的相对丰度在 16 千帕下最高(3.53%),表明较高的腔压可促进硝化细菌的生长。与反硝化有关的微生物,如β-蛋白质细菌、α-蛋白质细菌和ε-蛋白质细菌,随着腔压的升高呈先增加后减少的规律,并在 10 kPa 时富集。结果可以得出结论,在中等腔压下(即本研究中的 10 kPa 和 13 kPa)可以实现 SND。
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Achieving Simultaneous Nitrification and Denitrification by a Membrane Aerated Biofilm Reactor at Moderate Lumen Pressure
Lumen pressure is of crucial importance to achieve simultaneous nitrification and denitrification (SND) in the membrane aerated biofilm reactor (MABR); so, in this study, a laboratory-scale MABR was operated under different lumen pressures (7 kPa, 10 kPa, 13 kPa, and 16 kPa) successively to verify its impact on nitrogen removal. The results showed that NH4+-N oxidation was deficient under 7 kPa due to inadequate oxygen supply, while denitrification was depressed under 16 kPa. Total nitrogen removal efficiency was similar under 10 kPa and 13 kPa (around 78.9%), much higher than that under 7 kPa and 16 kPa (approximately 50%). The biomass density (22.35 g/m2) and biofilm thickness (500.3 µm) were the highest under 13 kPa, and EPS was increasingly secreted along with the increase in lumen pressure. The relative abundance of Nitrospirae was highest under 16 kPa (3.53%), indicating a higher lumen pressure could promote nitrifiers. The denitrifying-related microbes, such as β-proteobacteria, α-proteobacteria and ε-proteobacteria, showed an increasing and then decreasing pattern along with lumen pressure increase, and were enriched at 10 kPa. The results could draw the conclusion that SND could be achieved at moderate lumen pressure, i.e., 10 kPa and 13 kPa in this study.
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