Department of Environmental Engineering, Texas A&M University-Kingsville, Kingsville, Texas 78363, USA.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2012;47(7):949-63. doi: 10.1080/10934529.2012.667294.
A pilot-scale biological sequential treatment system consisting of a biotrickling filter and two biofilters was installed at Waste Water Lift Station # 64 in Brownsville, Texas, USA to evaluate the performance of the system being loaded with variable concentrations of wastewater hydrogen sulfide (H(2)S) emissions. In this study, the effectiveness of sulfur oxidizing bacteria along with the distribution of various sulfur species and their correlation with the performance of the biofilters was evaluated. The biofilters were packed with engineered media consisting of plastic cylinders with compacted organic material which was supplied by Met-Pro Environmental Air Solutions (formerly Bio·Reaction Industries). The overall performance of the pilot-scale biological sequential treatment system with an Empty Bed Residence Time (EBRT) of 60s and the overall performance of the biofilter unit with an EBRT of 35s developed a removal efficiency of > 99% at H(2)S levels up to 500 ppm. A decrease in performance over time was observed in the first and second sections of the first biofilter unit with the third section of the biofilter unit ultimately becoming the most robust unit removing most of the pollutant. The second biofilter unit was not needed and subsequently removed from the system. The number of CFUs in sulfur oxidizing T.thioparus selective media grew significantly in all four sections of the biofilter over the two months of pilot operation of the biological unit. The sulfur oxidizer growth rates appeared to be highest at low total sulfur content and at slightly acidic pH levels. This study has implications for improving the understanding of the distribution of sulfur oxidizing bacteria throughout the length of the biofilter columns, which can be used to further optimize performance and estimate breakthrough at these very high H(2)S input loadings.
在美国德克萨斯州布朗斯维尔的 64 号污水提升站安装了一个由生物滴滤塔和两个生物过滤器组成的中试规模生物顺序处理系统，以评估该系统在处理变量浓度的污水硫化氢（H 2 S）排放物时的性能。在这项研究中，评估了硫氧化细菌的有效性以及各种硫物种的分布及其与生物过滤器性能的相关性。生物过滤器中填充的是由塑料圆柱体和压实的有机材料组成的工程介质，这些材料由 Met-Pro Environmental Air Solutions（前身为 Bio·Reaction Industries）提供。中试规模生物顺序处理系统的整体性能（空床停留时间（EBRT）为 60 秒）和生物过滤器单元的整体性能（EBRT 为 35 秒）在 H 2 S 水平高达 500 ppm 时，可实现>99%的去除效率。在第一个生物过滤器单元的第一和第二部分中，随着第三部分生物过滤器单元最终成为去除大部分污染物的最有效单元，随着时间的推移，性能会下降。第二个生物过滤器单元不需要，因此从系统中移除。在生物单元运行两个月的时间里，在生物过滤器的所有四个部分中，硫氧化 T.thioparus 选择性介质中的 CFU 数量都显著增加。硫氧化菌的生长速率似乎在总硫含量低和略酸性 pH 值水平时最高。这项研究对改善对生物过滤器柱中硫氧化菌分布的理解具有重要意义，这可用于进一步优化性能并估计在这些非常高的 H 2 S 输入负荷下的穿透情况。
