Quan Xiangchun, Tang Qian, He Mengchang, Yang Zhifeng, Lin Chunye, Guo Wei
State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China.
J Environ Sci (China). 2009;21(7):865-71. doi: 10.1016/s1001-0742(08)62354-2.
The Daliao River, as an important water system in Northeast China, was reported to be heavily polluted by polycyclic aromatic hydrocarbons (PAHs). Aerobic biodegradations of four selected PAHs (naphthalene, phenanthrene, fluorene and anthracene) alone or in their mixture in river sediments from the Daliao River water systems were studied in microcosm systems. Effects of additional carbon source, inorganic nitrogen and phosphorus, temperature variation on PAHs degradation were also investigated. Results showed that the degradation of phenanthrene in water alone system was faster than that in water-sediment combined system. Degradation of phenanthrene in sediment was enhanced by adding yeast extract and ammonium, but retarded by adding sodium acetate and not significantly influenced by adding phosphate. Although PAHs could also be biodegraded in sediment under low temperature (5 degrees C), much lower degradation rate was observed. Sediments from the three main streams of the Daliao River water system (the Hun River, the Taizi River and the Daliao River) demonstrated different degradation capacities and patterns to four PAHs. Average removal rates (15 or 19 d) of naphthalene, phenanthrene, fluorene and anthracene by sediment were in the range of 0.062-0.087, 0.005-0.066, 0.008-0.016 and 0-0.059 mg/(L x d), respectively. As a result, naphthalene was most easily degraded compound, anthracene was the hardest one. In multiple PAHs systems, the interactions between PAHs influenced each PAH biodegradation.
辽河作为中国东北地区的一条重要水系，据报道已受到多环芳烃（PAHs）的严重污染。在微观系统中研究了辽河河水系沉积物中单独或混合存在的四种选定多环芳烃（萘、菲、芴和蒽）的好氧生物降解情况。还研究了添加碳源、无机氮和磷以及温度变化对多环芳烃降解的影响。结果表明，菲在纯水体系中的降解速度比在水 - 沉积物联合体系中更快。添加酵母提取物和铵可增强沉积物中菲的降解，但添加醋酸钠会抑制其降解，添加磷酸盐对其影响不显著。尽管多环芳烃在低温（5℃）下也能在沉积物中进行生物降解，但降解速率要低得多。辽河河水系三条主要支流（浑河、太子河和辽河）的沉积物对四种多环芳烃表现出不同的降解能力和模式。沉积物对萘、菲、芴和蒽的平均去除率（15或19天）分别在0.062 - 0.087、0.005 - 0.066、0.008 - 0.016和0 - 0.059 mg/（L·d）范围内。因此，萘是最容易降解的化合物，蒽是最难降解的。在多种多环芳烃体系中，多环芳烃之间的相互作用影响了每种多环芳烃的生物降解。
