Polybrominated diphenyl ethers (PBDEs) are a family where each congener possesses different physicochemical properties, persistence and/or toxicity. Biodegradation can selectively change the abundance of congeners. These warrant modeling of individual congeners by considering biodegradation pathways together with fate and transport (F&T) mechanisms. Accordingly, this study aims to develop a F&T model (Fate and Transport model for Hydrophobic Pollutants - FTHP) that integrates congener specific biodegradation of PBDEs in sediments. The model is tested using sediment data from a location representing the Lower South Bay of San Francisco. Results demonstrated settling, resuspension, and biodegradation as important mechanisms. FTHP is then used to predict congener concentrations in a period of 20 years for two cases (constant and time-dependent water column concentrations) and four alternative scenarios: no intervention (i.e., natural attenuation, also serves as the base case), no degradation, dredging and biostimulation. The greatest impact on the reduction of total PBDE concentrations was achieved by a reduction in water column concentrations, i.e. source control, and dredging. On the other hand, biostimulation coupled with source control was the most effective in reducing bioaccumulative PBDE congener concentrations and almost as effective as dredging for the rest of congeners. Proposed FTHP model can distinguish between congeners and help devise informed management plans which focus on decreasing risks associated with persistent and bioaccumulative compounds in contaminated sediments.

多溴二苯醚（PBDEs）是一个家族，其中每个同类物都具有不同的理化特性，持久性和/或毒性。生物降解可以有选择地改变同类物的含量。通过考虑生物降解途径以及命运和运输（F＆T）机制，这些可以对单个同类物进行建模。因此，本研究旨在建立一个F＆T模型（疏水性污染物的命运与运输模型-FTHP），该模型整合了沉积物中多溴二苯醚的同系物特异性生物降解。使用代表旧金山下南湾的位置的沉积物数据测试了该模型。结果表明沉降，重悬和生物降解是重要的机制。然后使用FTHP来预测两种情况（恒定和随时间变化的水柱浓度）和四种替代方案在20年内的同类物浓度：无干预（即自然衰减，也可作为基础情况），无降解，疏dr和生物刺激。降低总PBDE浓度的最大影响是通过降低水柱浓度，即水源控制和疏ging。另一方面，生物刺激与源头控制相结合，在降低生物累积性多溴二苯醚同系物浓度方面最有效，几乎与疏通其余同系物一样有效。