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首页> 外文会议>Air Waste Management Association's annual conference exhibition >Biofilter Pilot Study for Control of VOC Emissions at a Chemical Batch Processing Plant
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Biofilter Pilot Study for Control of VOC Emissions at a Chemical Batch Processing Plant

机译：化学批量加工厂控制VOC排放的生物膜试验研究

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While biofiltration has proven to be an effective tool in controlling odor emissions, it has had limited application in the control of volatile organic compound (VOC) emissions from industrial processes where Best Available Control Technology (BACT) must be applied. This study evaluated the effectiveness of biofiltration as a control for VOC emissions from a chemical batch processing plant. The study was conducted over a twelve-week period starting in late August and ending in early November. The study was designed to evaluate the destruction removal efficiency (DRE) of a biofilter system for three compounds of interest: methanol, acetone, and toluene with the intent of demonstrating if a biofilter could meet BACT for VOC control. Biofilter technology was chosen for evaluation as an alternative to traditional thermal technologies due to its potential for lower annual operating costs and for decreased combustion emissions. The pilot equipment utilized in this pilot study included; the biofilter pilot unit, a temporary exhaust system, and a gas sampling and analysis system. The pilot unit consisted of an upfront biotrickling tower, followed by two biofilter towers (operating in either parallel or series configurations), and a final bio-trickling filter serving as a polishing step. The pilot study indicated that this technology could demonstrate a BACT criteria of greater than 95 % DRE for each test compound depending on inlet VOC concentration. BACT was achieved when inlet concentrations exceeded the following levels: methanol 100 PPMv, acetone 50 PPMv, toluene 5 PPMv. Basic rate modeling for each compound suggested that the rate of methanol consumption in the pilot unit was mass transfer limited while the overall rates of toluene and acetone consumption may have been limited by biologically metabolism. Data from the study suggested that temperature played a critical role in overall system DRE for all three compounds, with higher DRE levels associated with warmer daytime temperatures. This trend indicated that a full scale biofilter design would necessitate the installation of a dedicated boiler capable of supplying the required heat to maintain a biomass bed temperature of 80°F or greater in order to achieve consistently high DRE for the test chemical species.
机译：虽然生物滤膜已被证明是控制气味排放的有效工具，但在必须应用最佳可用控制技术（BACT）的工业过程中，它在控制挥发性有机化合物（VOC）排放方面具有有限的应用。该研究评估了生物滤波的有效性作为化学批量加工厂的VOC排放的控制。该研究在8月下旬开始，在11月初结束的十二个星期内进行。该研究旨在评估生物过滤器系统的销毁去除效率（DRE），用于三种感兴趣的化合物：甲醇，丙酮和甲苯，如果生物过滤器可以满足VOC对照。选择生物过滤技术，作为传统热技术的替代方案，由于其较低年度运营成本和降低的燃烧排放潜力，因此是传统的热技术。包括在该试点研究中的试点设备;生物过滤器试验单元，临时排气系统和气体采样和分析系统。试点单元由前期生物轧制塔组成，其次是两个生物过滤器塔（以平行或串联配置操作），以及用作抛光步骤的最终生物滴流滤波器。试点研究表明，根据入口VOC浓度，该技术可以展示每种测试化合物的大于95％RE的BACT标准。当入口浓度超过以下水平时，达到Bact：甲醇100ppmv，丙酮50ppmv，甲苯5 ppmv。每种化合物的基本速率建模表明，试点单元中的甲醇消耗率为质量转移限制，而甲苯和丙酮消耗的总速率可能受到生物代谢的限制。来自该研究的数据表明，温度在所有三种化合物的整个系统DRE中发挥着关键作用，具有较高的DRE水平与温暖的白天温度相关。这一趋势表明，全尺寸的生物过滤器设计将需要安装一种能够提供所需热量的专用锅炉，以保持80°F或更大的生物质床温度，以便为测试化学物质始终如一的高DRE。

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