模拟全尺寸硝化过滤器的实验室规模生物膜反应器受到供水中经常遇到的外来污染物的挑战。苯酚、一氯酚和二氯酚立即被去除（高达92%），随着进水浓度的增加，去除率降低。三氯苯酚没有被生物降解。一氯苯和二氯苯也被去除（高达81%），但在生物降解变得显著之前，需要8-20小时的酶诱导期。在许多情况下，喂食易降解的有机基质（醋酸盐）会相对少量地增加外源物质的去除。 这一结果表明，硝化细菌产生的未知背景有机物质和可溶微生物产物允许细菌聚集，能够降解一系列外源化合物。包括20个参考文献、表格和图表。

Laboratory-scale biofilm reactors simulating a full-scale nitrification filter were challenged with xenobiotic contaminants frequently encountered in water supplies. Phenol and mono- and dichlorophenols were removed immediately (by up to 92 percent), with increasing influent concentration reducing the percentage removal. Trichlorophenols were not biodegraded. Mono- and dichlorobenzenes were also removed (up to 81 percent), but an enzyme-induction period of 8-20 h was required before biodegradation became significant. In many cases, feeding of an easily degraded organic substrate (acetate) increased removals of the xenobiotics by a relatively small amount. This result suggests that unidentified background organic material and soluble microbial products generated by nitrifying bacteria allow the accumulation of bacteria able to degrade a range of xenobiotic compounds. Includes 20 references, tables, figures.