Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, United States.
Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, United States.
Bioresour Technol. 2014;152:74-9. doi: 10.1016/j.biortech.2013.10.116. Epub 2013 Nov 9.
Effects of pH on gas-phase biofilter performance including NH3 removal efficiency (RE), N2O generation, and microbial communities of ammonia oxidizers and denitrifies, are examined. A two-step experiment was carried out on four biofilters for 130 days. In step 1 with pH 8.0, NH3 REs were 85-95% and N2O concentrations were 0.1-0.4 ppm. In step 2, pH was adjusted to 4.5, 6.0, 8.0, and 9.5 in four biofilters, respectively. The acidified biofilters showed higher NH3 REs than the alkalized biofilters. N2O concentration in biofilters with pH 4.5 and 6.0 was increased to 1.5 and 0.5 ppm, respectively, while no change in the alkalized biofilters. Comparing to communities in step 1, the amoA and nosZ structures were altered when pH was changed to 4.5 and 6.0, but not at 9.5. Abundance of amoA was reduced at pH 4.5, while nosZ abundance was increased with considerably less changes in acidified biofilters compared to alkalized biofilters.
考察了 pH 值对包括氨去除效率（RE）、N2O 生成以及氨氧化菌和反硝化菌微生物群落在内的气相生物滤池性能的影响。在四个生物滤池中进行了为期 130 天的两步实验。在步骤 1 中，pH 值为 8.0，NH3 REs 为 85-95%，N2O 浓度为 0.1-0.4 ppm。在步骤 2 中，分别将四个生物滤器的 pH 值调整为 4.5、6.0、8.0 和 9.5。酸化生物滤池的 NH3 REs 高于碱化生物滤池。pH 值为 4.5 和 6.0 的生物滤池中的 N2O 浓度分别增加到 1.5 和 0.5 ppm，而碱化生物滤池中的 N2O 浓度没有变化。与步骤 1 中的群落相比，当 pH 值变为 4.5 和 6.0 时，amoA 和 nosZ 结构发生了变化，但在 pH 值为 9.5 时没有变化。在 pH 值为 4.5 时，amoA 的丰度降低，而在酸化生物滤池中，nosZ 的丰度增加，与碱化生物滤池相比，变化要小得多。
