Hao Ruixia, Li Jianbing, Zhou Yuwen, Cheng Shuiyuan, Zhang Yi
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China.
Chemosphere. 2009 May;75(8):987-94. doi: 10.1016/j.chemosphere.2009.01.069. Epub 2009 Feb 28.
The relationship between nonylphenol (NP) isomer structure and its biodegradability within the wastewater treatment process of sequencing batch reactor (SBR) was investigated. The GC-MS method was used for detecting the NP isomers existing in the SBR influent, activated sludge and effluent. Fifteen NP isomers were detected in the influent, with significant biodegradability variations being observed among these isomers. It was found that the NP isomers associated with retention time of 10.553, 10.646, 10.774, and 10.906 min in the GC-MS analysis showed higher biodegradability, while the isomers with retention time of 10.475, 10.800, and 10.857 min illustrated lower biodegradability. Through analyzing the mass spectrograms, the chemical structures of four selected NP isomers in the wastewater were further deduced. The higher correlation coefficients of 0.9421 and 0.9085 were observed between the NP isomer biodegradation rates and the molecular connectivity indexes with the order of two and four, respectively. Such correlation analysis indicated that a more complex side branch structure (such as a larger side carbon-chain branch or more branches in the nonyl) of NP isomer would lead to lower biodegradability, and a longer nonyl chain of the isomer would result in a higher biodegradability.
研究了壬基酚（NP）异构体结构与其在序批式反应器（SBR）废水处理过程中生物降解性之间的关系。采用气相色谱 - 质谱联用（GC - MS）法检测SBR进水、活性污泥和出水中存在的NP异构体。在进水中检测到15种NP异构体，这些异构体之间观察到显著的生物降解性差异。发现在GC - MS分析中保留时间为10.553、10.646、10.774和10.906分钟的NP异构体显示出较高的生物降解性，而保留时间为10.475、10.800和10.857分钟的异构体显示出较低的生物降解性。通过分析质谱图，进一步推导了废水中四种选定NP异构体的化学结构。NP异构体生物降解率与二阶和四阶分子连接性指数之间分别观察到较高的相关系数0.9421和0.9085。这种相关性分析表明，NP异构体更复杂的侧链结构（如壬基中更大的侧碳链分支或更多分支）会导致较低的生物降解性，而异构体更长的壬基链会导致更高的生物降解性。
