Krishnakumar B, Hima A M, Haridas Ajit
Environmental Technology, Regional Research Laboratory (CSIR-India), Thiruvananthapuram 695019, India.
Appl Microbiol Biotechnol. 2007 Feb;74(1):215-20. doi: 10.1007/s00253-006-0641-x. Epub 2006 Oct 6.
An innovative, coir-pith-based, filter bed for degrading vapor phase toluene in a gas biofilter over 160 days without any external nutrient supply is reported in this study. Indigenous microflora present in the coir pith as well as in the aerobic sludge added at the start-up stage metabolized the toluene, and correspondingly, CO(2) was produced in the biofilter. Inlet toluene concentration in the range of 0.75 to 2.63 g/m(3) was supplied to the biofilter in short acclimation periods. The maximum elimination capacity achieved was 96.75 g/m(3) x h at 120.72 g/m(3) x h loading where around 60% was recovered as CO(2). The filter bed maintained a stable low-pressure drop (0-4 mm H(2)O), neutral pH range (6.5-7.5), and moisture content of 60-80% (w/w) throughout the period. In addition to toluene-degrading microbial community, a grazing fauna including rotifer, bacteriovoric nematode, tardigrade, and fly larvae were also present in the filter bed. The overall performance of the biofilter bed in pollutant removal and sustainability was analyzed in this study.
本研究报道了一种创新的、基于椰壳纤维髓的滤床，该滤床用于在气体生物滤池中降解气相甲苯，在无任何外部营养供应的情况下运行了160天。椰壳纤维髓中存在的本地微生物群落以及在启动阶段添加的好氧污泥代谢了甲苯，相应地，生物滤池中产生了二氧化碳。在短时间的驯化期内，向生物滤池供应浓度范围为0.75至2.63 g/m³的进气甲苯。在120.72 g/m³·h的负荷下，实现的最大去除能力为96.75 g/m³·h，其中约60%以二氧化碳的形式回收。在整个期间，滤床保持稳定的低压降（0 - 4 mmHg₂O）、中性pH范围（6.5 - 7.5）以及60 - 80%（w/w）的水分含量。除了降解甲苯的微生物群落外，滤床中还存在包括轮虫、食细菌线虫、缓步动物和蝇幼虫在内的捕食性动物群落。本研究分析了生物滤床在污染物去除和可持续性方面的整体性能。
