固定床（FXB）生物过程（包括生物活性过滤） 系统），生物膜在固定的介质床上形成，如沙子、无烟煤或 颗粒活性炭。当微生物群落氧化并减少溶解 组分，氧化还原电位的稳定梯度在床层深度上发展 穿过给定的生物膜。这些氧化还原梯度形成FXB生物反应器 特别适用于销毁多种污染物，通常在一个 生物反应器。本文列出了可通过过滤器去除的污染物的范围 FXB生物反应器工艺，并描述了两个相关的案例研究。 包括24个参考文献，图。

In fixed-bed (FXB) biological processes (including biologically active filtration systems), biofilms develop on a stationary bed of media, such as sand, anthracite, or granular activated carbon. As the microbial community oxidizes and reduces dissolved constituents, stationary gradients of redox potential develop across the depth of the bed and across a given biofilm. These redox gradients make FXB bioreactors particularly suitable for destroying a wide variety of contaminants, often within a single bioreactor. This paper lists the breadth of contaminants that can be removed through the FXB bioreactor process and describes two related case studies. Includes 24 references, figure.