Pan Fei, Chen Wu, Zhang Ya-qing, Ying Chao-ming, Liu Yang, Zeng Qing-fu
School of Environmental Science & Engineering, Donghua University, Shanghai 201620, China.
Huan Jing Ke Xue. 2009 Dec;30(12):3718-23.
The goal of these studies was to determine the fate of 16 polycyclic aromatic hydrocarbons (PAHs) during the 94 days of composting of municipal sewage sludge with rapeseed meal. The total PAHs calculated from the sum of the amounts of the 16 PAHs in the initial mixture of municipal sewage sludge was about 1.792 mg x kg(-1). Then the content of total 16 PAHs was 0.153 mg x kg(-1) at the final of composting. The level of total PAHs fell by about 91.5% (p < 0.05) at the end of composting. While the content of humic substance increased, the content of PAHs decreased in the intermediate stages (31-61 days) of composting. The treatment by composting led to a decrease of all PAHs mainly in 16-31 d, but some differences could be observed between PAHs with three or fewer aromatic rings (N=3) and those with four or more (N=4). The PAHs with N of three or fewer (except phenanthrene) exhibited a continuous decrease, which the PAHs with N of four or more and phenanthrene showed increases between the 31-46 days. This indicates the high potential sorption mainly of PAHs with high molecular weight (N=4) plus phenanthrene, their tight adsorption makes them inaccessible for biodegradation. The high molecular weight PAHs showed a greater reduction of their bioavailability than low molecular weight (except benzo[b]fluoranthene).
这些研究的目的是确定16种多环芳烃（PAHs）在城市污水污泥与菜籽粕共堆肥94天期间的归宿。根据城市污水污泥初始混合物中16种PAHs的总量计算得出的总PAHs约为1.792 mg x kg(-1)。堆肥结束时，16种PAHs的总含量为0.153 mg x kg(-1)。堆肥结束时，总PAHs水平下降了约91.5%（p < 0.05）。在堆肥的中间阶段（31 - 61天），腐殖质含量增加，PAHs含量下降。堆肥处理导致所有PAHs主要在16 - 31天减少，但芳香环数为三个或更少（N = 3）的PAHs与四个或更多（N = 4）的PAHs之间存在一些差异。芳香环数为三个或更少的PAHs（除菲外）呈持续下降趋势，而芳香环数为四个或更多的PAHs以及菲在31 - 46天之间呈增加趋势。这表明主要是高分子量（N = 4）的PAHs加上菲具有高潜在吸附性，它们的紧密吸附使其难以被生物降解。高分子量PAHs的生物可利用性比低分子量PAHs（除苯并[b]荧蒽外）降低得更多。
