Department of Chemical Engineering, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Spain.
J Environ Manage. 2011 Aug;92(8):1978-85. doi: 10.1016/j.jenvman.2011.03.045. Epub 2011 Apr 29.
The effect of using ground tire rubber (GTR) as an adsorptive material in the removal of a 2:1:1 weight mixture of n-butyl acetate, toluene and m-xylene by using a peat biofilter under different intermittent conditions was investigated. The performance of two identical size biofilters, one packed with fibrous peat alone and the other with a 3:1 (vol) fibrous peat and GTR mixture, was examined for a period of four months. Partition coefficients of both materials were measured. Values of 53, 118 and 402 L kg(-1) were determined for n-butyl acetate, toluene and m-xylene in peat, respectively; and values of 40, 609 and 3035 L kg(-1) were measured for the same compounds in GTR. Intermittent load feeding of 16 h per day, 5 days per week working at an EBRT of 60 s and an inlet VOC concentration of 0.3 g C m(-1), resulted in removal efficiencies higher than 90% for both biofilters, indicating that the addition of GTR did not adversely affect the behavior of the bioreactor. Full removal of n-butyl acetate was obtained for both biofilters. GTR improved the removal of the aromatics in the first part of the biofilter, facilitating lower penetration of the toluene and m-xylene into the bed. A 31-day starvation period was applied and intermittent operation subsequently restarted. In both biofilters, high removal efficiencies after a re-acclimation period of two days were achieved. A shock loading test related to 1-h peaks of three- and four-fold increases in its baseline concentration (0.30 g C m(-3)) was applied in both biofilters. For the biofilter packed with the peat and GTR mixture, attenuation greater than 60% was observed in the maximum outlet concentration when compared to the biofilter packed with peat alone.
使用地面轮胎橡胶 (GTR) 作为吸附材料，在不同间歇条件下，通过泥炭生物过滤器去除 2:1:1 重量比的乙酸丁酯、甲苯和间二甲苯混合物的效果进行了研究。研究了两个相同尺寸的生物过滤器的性能，一个装有纤维状泥炭，另一个装有 3:1（体积）纤维状泥炭和 GTR 混合物，为期四个月。测量了两种材料的分配系数。在泥炭中，乙酸丁酯、甲苯和间二甲苯的分配系数分别为 53、118 和 402 L kg(-1)；在 GTR 中，相同化合物的分配系数分别为 40、609 和 3035 L kg(-1)。每天 16 小时、每周 5 天、EBRT 为 60 s 和入口 VOC 浓度为 0.3 g C m(-1) 的间歇进料，导致两个生物过滤器的去除效率均高于 90%，表明添加 GTR 并未对生物反应器的性能产生不利影响。两个生物过滤器均完全去除了乙酸丁酯。GTR 提高了芳烃在前半部分生物过滤器中的去除率，从而降低了甲苯和间二甲苯进入床层的穿透率。进行了 31 天的饥饿期，随后重新开始间歇运行。在两个生物过滤器中，经过两天的重新适应期后，均实现了高去除效率。在两个生物过滤器中，均进行了与基线浓度（0.30 g C m(-3)）增加三到四倍的 1 小时高峰相关的冲击负荷试验。与单独装有泥炭的生物过滤器相比，装有泥炭和 GTR 混合物的生物过滤器在最大出口浓度时观察到衰减大于 60%。
