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Biological treatment of benzene in a controlled trickle bed air biofilter

机译：受控滴流床空气生物滤池中苯的生物处理

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摘要

Trickle bed air biofilters (TBABs) are suitable for treatment of relatively high volumes of volatile organic compounds due to their controlled environment. A laboratory-scale TBAB was used for the treatment of an air stream contaminated with benzene under different loading rates (LRs) ranging from 7.2 to 76.8 g m~(-3) h~(-1). The TBAB was operated at pH 7 and 25℃.rnConsistent long-term performance of the benzene TBAB depends on various factors one of which is the excess amount of biomass accumulated within the bed. Three experimental strategies for biomass control were employed in the study: weekly backwashing for 1 h, starvation (no benzene feed for a period of 2 d/ week) and stagnation (no benzene, air and nutrient flow for a period of 2 d/week). The experimental plan was designed to investigate the long-term performance of the TBAB with emphasis on the empty bed resident time (EBRT), different benzene LRs, removal efficiency with TBAB depth, volatile suspended solids and carbon mass balance closure.rnFor benzene loading up to 34.1 g m~(-3) h~(-1) removal efficiency consistently over 98% was achieved. At the maximum LR 76.8 g m~(-3) h~(-1) the removal efficiency was still above 80% by utilizing stagnation strategy for 2 d and gas flow switching once per week as means of biomass control. Backwashing once per week provided less efficient performance as compared to stagnation while starvation showed the worst performance. EBRT at 120s provided the best performance while EBRT at 90s showed slightly lower performance.
机译：由于其受控环境，流床空气生物滤池（TBAB）适用于处理相对大量的挥发性有机化合物。实验室规模的TBAB用于处理在7.2至76.8 g m〜（-3）h〜（-1）范围内的不同负载率（LR）的被苯污染的气流。 TBAB在pH值为7和25℃下运行。苯TBAB的长期稳定性能取决于多种因素，其中之一是床内积累的生物量过多。在研究中采用了三种控制生物量的实验策略：每周反冲洗1小时，饥饿（2 d /周无苯进料）和停滞（2 d /周无苯，空气和养分流） ）。该实验计划旨在研究TBAB的长期性能，重点是空床停留时间（EBRT），不同的苯LRs，具有TBAB深度的去除效率，挥发性悬浮固体和碳质量平衡封闭。达到34.1 gm〜（-3）h〜（-1）的去除效率始终超过98％。在最大LR 76.8 g m〜（-3）h〜（-1）的条件下，利用停滞策略持续2 d并每周进行一次气流切换作为生物量控制手段，去除效率仍高于80％。与停滞相比，每周反洗一次的效率较低，而饥饿则表现最差。 120s时的EBRT提供了最佳性能，而90s时的EBRT显示了稍低的性能。

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  • 来源
    《Chemosphere》 |2009年第10期|1315-1321|共7页
  • 作者

    Ashraf Aly Hassan; George Sorial;

  • 作者单位

    Department of Civil and Environmental Engineering, University of Cincinnati, 765 Baldwin Hall, 2624 Clifton Avenue, Cincinnati, OH 45221-0071, United States;

    Department of Civil and Environmental Engineering, University of Cincinnati, 765 Baldwin Hall, 2624 Clifton Avenue, Cincinnati, OH 45221-0071, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    biofiltration; benzene; biodegradation; empty bed residence time (EBRT); trickle bed air biofilter (TBAB); VOCs;

    机译：生物过滤苯;生物降解空床停留时间（EBRT）;滴流床空气生物滤池（TBAB）;挥发性有机化合物;

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