Variation in Biofilm Structure and Activity Along the Length of a Rising Main Sewer
Variation in Biofilm Structure and Activity Along the Length of a Rising Main Sewer
复制标题
生物膜结构和活性沿上升主下水道长度的变化
DOI：
10.2175/106143008x390771
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发表时间：
2009
影响因子：
3.1
通讯作者：
Zhiguo Yuan
中科院分区：
文献类型：
--
作者：
J. Mohanakrishnan;K. Sharma;R. Meyer;G. Hamilton;J. Keller;Zhiguo Yuan
下水道系统本质上是动态的，具有周期性的水力流量和废水底物浓度变化。虽然目前有多种模型可用于预测上升干管中硫化氢(H2 S)的产生，但它们假设沿长度方向的生物膜活动恒定，而忽略了底物可获得性对生物膜发展的影响。为了研究上升主体生物膜结构和活性的变化，对Robbins装置进行了详细的研究，该装置是与模拟的真实上升主体平行建立的。监测了废水流经实验装置和实际下水道系统时废水特性的变化。研究表明，生物膜的活性随地点的不同而有显著差异，与下游的生物膜相比，生物膜对应于上升主干的开始，能够产生更多的硫化物和挥发性脂肪酸。对这些生物膜微生物群落组成的分析表明，在一般细菌种群和硫酸盐还原剂方面，生物膜的多样性和丰度都不同。这些差异被认为是下水道沿线不同基质类型和可用性的结果。结果表明，生物膜的结构和活性可能会随着上升干管的长度而有很大的变化，在改进下水道建模和考虑不同硫化氢管理方案的整体影响时，应该考虑到这一点。
Sewers systems are dynamic in nature, with periodic variation of hydraulic flow and wastewater substrate concentrations. While various models are currently available for predicting hydrogen sulfide (H 2S) production in rising mains, they assume constant biofilm activities along the length and ignore the effect of substrate availability on biofilm development. To investigate variation in rising main biofilm structure and activity, detailed studies were carried out on a Robbins device setup, which was established in parallel to a real rising main that it simulated. The changes in wastewater characteristics, as wastewater traveled through both the experimental setup and the real sewer system, were monitored. The study revealed that the biofilm activities varied significantly with locations, with biofilm corresponding to the start of the rising main capable of greater sulfide and volatile fatty acid production than biofilm downstream. Analysis of microbial community composition of these biofilms showed a difference in diversity and abundance, both with regard to general bacterial populations and sulfate reducers. These differences were hypothesized to be a consequence of varying substrate types and availability along the sewer line. The results suggest that the biofilm structure and activity may vary considerably along the length of rising mains and should be taken into consideration for improved sewer modeling and when considering the overall effect of different hydrogen sulfide management options.