Department of Chemical Engineering and Environmental Technology, Valladolid University, 47005 Valladolid, Spain.
Water Res. 2013 Sep 1;47(13):4312-21. doi: 10.1016/j.watres.2013.05.007. Epub 2013 May 21.
Clogging due to biomass accumulation and the loss of structural stability of the packing media are common operational drawbacks of standard gas biofiltration inherent to the traditional biofilter design, which result in prohibitive pressure drop buildups and media channeling. In this work, an innovative step-feed biofilter configuration, with the air emission supplied in either two or three locations along the biofilter height, was tested and compared with a standard biofilter using toluene as a model pollutant and two packing materials: compost and perlite. When using compost, the step-feed biofilter supported similar elimination capacities (EC ≈ 80 g m(-3) h(-1)) and CO2 production rates (200 g m(-3) h(-1)) to those achieved in the standard biofilter. However, while the pressure drop in the step-feed system remained below 300 Pa m bed(-1) for 61 days, the standard biofilter reached this value in only 14 days and 4000 Pa m bed(-1) by day 30, consuming 75% more compression energy throughout the entire operational period. Operation with perlite supported lower ECs compared to compost in both the step-feed and standard biofilters (≈ 30 g m(-3) h(-1)), probably due to the high indigenous microbial diversity present in this organic packing material. The step-feed biofilter exhibited 65% lower compression energy requirements than the standard biofilter during operation with perlite, while supporting similar ECs. In brief, step-feed biofiltration constitutes a promising operational strategy capable of drastically reducing the operating costs of biofiltration due to a reduced energy consumption and an increased packing material lifespan.
生物滤池在标准设计下，由于生物量积累和填充介质结构稳定性丧失而导致堵塞是常见的运行缺陷，这会导致不可承受的压降累积和介质沟流。在这项工作中，采用创新的分步进料生物滤池配置，空气排放分别沿生物滤池高度的两个或三个位置供应，并用甲苯作为模型污染物和两种包装材料（堆肥和珍珠岩）对其进行了测试和比较。使用堆肥时，分步进料生物滤池的去除容量（EC≈80 g m(-3) h(-1))和 CO2 生成速率（200 g m(-3) h(-1))与标准生物滤池相当。然而，尽管分步进料系统的压降在 61 天内保持在 300 Pa m 床(-1)以下，但标准生物滤池仅在 14 天和 30 天达到 4000 Pa m 床(-1)，在整个运行期间消耗了 75%更多的压缩能量。与堆肥相比，在分步进料和标准生物滤池中，珍珠岩的 EC 较低（≈30 g m(-3) h(-1))，这可能是由于这种有机填充材料中存在的高本土微生物多样性。在使用珍珠岩的过程中，分步进料生物滤池的压缩能量需求比标准生物滤池低 65%，同时支持相似的 EC。总之，分步进料生物过滤是一种很有前途的运行策略，由于能耗降低和填充材料寿命的延长，可以大大降低生物过滤的运行成本。
