Abstract：
Two cost-effective packing materials were used for n-butyl acetate removal in lab-scale biofilters, namely waste spruce root wood chips and biochar obtained as a byproduct from a wood gasifier. Three biofilters packed with spruce root wood chips: without biochar (SRWC), a similar one with 10% of biochar (SRWC-B) and that with 10% of biochar impregnated with a nitrogen fertilizer (SRWC-IB) showed similar yet differing maximum elimination capacities of 206 ± 27, 275 ± 21 and 294 ± 20 g m-3 h-1, respectively, enabling high pollutant removal efficiency (>95% at moderate loads) and stable performance. The original biochar adsorption capacity was high (208 ± 6 mgtoluene g-1), but near 70% of it was lost after a 300-day biofilter operation. By contrast, the exposed impregnated biochar drastically increased its adsorption capacity in 300 days (149 ± 7 vs. 17 ± 5 mgtoluene g-1). Colony forming unit (CFU) and microscopic analyses revealed significant packing material colonization by microorganisms and grazing fauna in all three biofilters with an acceptable pressure drop, up to 1020 Pa m-1, at the end of biofilter operation. Despite a higher price (14 vs. 123 €m-3), the application of the best performing SRWC-IB packing can reduce the total investment costs by 9% due to biofilter volume reduction.
摘要：
在实验室规模的生物过滤器中，使用两种具有成本效益的填充材料去除乙酸正丁酯，即从木材气化炉中作为副产品获得的废弃云杉根木屑和生物炭。三个装有云杉根木片的生物过滤器：无生物炭（SRWC），具有10％的生物炭（SRWC-B）和具有10％的用氮肥浸渍的生物炭（SRWC-IB）的相似的最大消除能力分别为206±27、275±21和294±20gm-3h-1，实现高污染物去除效率(在中等负荷下>95%)和稳定的性能。原始生物炭吸附能力高（208±6mg甲苯g-1），但是在300天的生物过滤器运行后，其中近70％的损失。相比之下,暴露的浸渍生物炭在300天内大幅增加了其吸附能力(149±7vs.17±5mg甲苯g-1）。菌落形成单位（CFU）和显微镜分析显示，在所有三个生物过滤器中，微生物和放牧动物的填充材料定植具有可接受的压降，高达1020Pam-1，在生物滤池运行结束时。尽管价格较高（14vs.123€m-3），由于减少了生物过滤器的体积，应用最佳性能的SRWC-IB包装可以将总投资成本降低9％。
