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):979-89. doi: 10.1080/10934529.2012.667304.
In this study, a pilot-scale sequential biological treatment system combining a biotrickling filter and biofilter was used to optimize the removal of variable emission H(2)S loadings ranging from 30 to 120 g m(-3) h(-1)at a wastewater lift station in Brownsville, Texas USA. The biotrickling filter recycle water pH remained between 2.0 to 3.0 during the four months of unit operation and the overall removal efficiency for H(2)S was >99%. The biotrickling filter removal efficiency was 70 ± 8%, with an elimination capacity of 10 to 80 g m(-3) h(-1) while the biofilter elimination capacity ranged from 10 to 40 g m(-3) h(-1). The sequential treatment system was operated initially at an Empty Bed Residence Time (EBRT) of 120 s (50 s for the biotrickling filter and 70 s for biofilter) for two months and then at an EBRT of 60 s (25 s for biotrickling filter and 35s for biofilter) for the remainder of the operating period; remarkably, there was only a slight decrease in removal efficiency at 60 s EBRT. In order to qualitatively evaluate the changes in recycle water quality in the system on the performance of the unit in precipitating sulfur species, the equilibrium chemical model, Visual MINTEQ was employed. The model predicted speciation results based on the feed water quality and sulfur loadings, and also forecast some iron-sulfur complexes which have potential to form some complex precipitates. This research demonstrated that low pH re-circulating water quality in the biological treatment of H(2)S was possible without compromising the high removal efficiency, and that an improved understanding of the recycle water chemistry of the trickling unit of a sequential treatment system could be useful in the overall optimization of the process.
在这项研究中，采用了一个中试规模的序批式生物处理系统，结合生物滴滤器和生物滤池，优化了美国得克萨斯州布朗斯维尔一个污水提升站可变 H(2)S 负荷（30 至 120 g m(-3) h(-1)）的去除效果。在四个月的运行过程中，生物滴滤器循环水的 pH 值保持在 2.0 到 3.0 之间，H(2)S 的总体去除效率超过 99%。生物滴滤器的去除效率为 70±8%，消除能力为 10 至 80 g m(-3) h(-1)，而生物滤池的消除能力范围为 10 至 40 g m(-3) h(-1)。该序批式处理系统最初以空床停留时间（EBRT）为 120 s（生物滴滤器为 50 s，生物滤池为 70 s）运行两个月，然后在剩余的运行时间内以 EBRT 为 60 s（生物滴滤器为 25 s，生物滤池为 35 s）运行；值得注意的是，在 60 s EBRT 时，去除效率仅略有下降。为了定性评估系统中循环水水质变化对沉淀硫物种单元性能的影响，采用了 Visual MINTEQ 平衡化学模型。该模型根据进水水质和硫负荷预测了物种形成结果，并预测了一些具有形成复杂沉淀潜力的铁-硫络合物。本研究表明，在不影响高去除效率的情况下，对生物处理 H(2)S 的低 pH 循环水水质是可行的，并且对序批式处理系统滴滤单元循环水化学的深入了解可能有助于对整个过程进行优化。
