Effects of suspended sediment on the biodegradation and mineralization of phenanthrene in river water.
Effects of suspended sediment on the biodegradation and mineralization of phenanthrene in river water.
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DOI：
10.2134/jeq2010.0305
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发表时间：
2011
影响因子：
2.4
通讯作者：
X. Xia;Zhui Zhou;Chuanhui Zhou;Guohua Jiang;Ting Liu
中科院分区：
文献类型：
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作者：
X. Xia;Zhui Zhou;Chuanhui Zhou;Guohua Jiang;Ting Liu
亚洲河流普遍存在高悬沙浓度。此外，气候变化可造成洪水泛滥，导致沉积物再悬浮和土壤侵蚀，从而导致许多自然沃茨中SPS的高浓度。研究了SPS的存在及其有机碳组成对菲生物降解和矿化的影响。研究了三种沉积物，包括原始沉积物（OS）、375 ℃（S375）和600 ℃（S600）燃烧沉积物。采用14 C-呼吸计法研究了土壤杆菌（Agrobacterium sp.）对[14 C]PHE的矿化作用。结果表明，不添加SPS时PHE的矿化速率显著低于添加OS和S600时的矿化速率，但高于添加S375时的矿化速率，说明沉积物的存在对PHE矿化的影响取决于其有机碳组成。培养2d后，S375和OS系统中PHE残留量约为S600系统的1.5倍。培养26 d后，在OS、S600和S375体系中，PHE的矿化率分别为34.64%、29.40%和14.00%。OS和S600体系的一级反应速率常数约为S375体系的3倍。SPS对PHE生物降解和矿化速率的净影响取决于其对化合物生物有效性和细菌种群的影响。这项研究表明，黑C在降低沉积物中菲的矿化速率方面发挥了关键作用，即使没有老化。
High suspended sediment (SPS) concentration commonly exists in many Asian rivers. Furthermore, climate change can cause high floods and lead to the resuspension of sediments and soil erosion, resulting in high SPS concentration in many natural waters. This research studied the impact of the presence of SPS and organic C composition of SPS on the biodegradation and mineralization of phenanthrene (PHE). Three sediments, including original sediment (OS), 375 degrees C (S375), and 600 degrees C (S600) combusted sediment, were studied. A flask-based 14C-respirometer system was applied to study the mineralization of [14C]PHE by Agrobacterium sp. The mineralization rate of PHE in the absence of SPS was significantly lower than that with the presence of OS and S600 but higher than that with S375, suggesting that the effect of the presence of sediment on PHE mineralization depended on its organic C composition. The residual levels of PHE in the S375 and OS systems were about 1.5 times that of the S600 system after incubation for 2 d. After 26-d incubation, the mineralization rates of PHE were 34.64, 29.40, and 14.00% in the OS, S600, and S375 systems, respectively. The first-order rate constants of the OS and S600 systems were about three times that of the S375 system. The net influence of SPS on the biodegradation and mineralization rates of PHE was dependent on its effects on compound bioavailability and bacteria population. This study suggested that black C played a key role in reducing the mineralization rates of PHE in sediments-even without aging.