城市污水处理厂的挥发性恶臭有机物组成及来源

Sources and components of MVOC from a municipal sewage treatment plant in Guangzhou

采用GDX-502采样管和二次热解吸与GC-MSD联用仪研究广州一个典型城市污水处理厂不同污水处理单元和周边环境空气中挥发性恶臭有机物(MVOC)的组成和含量,通过对源排放特征、分子标志物和大气化学活性分析,建立该污水处理厂的MVOC源成分谱.结果表明,该污水处理厂检出烷烃、卤代烃、烯烃、芳香烃、含氧有机物和硫醚等6类40种挥发性有机物(VOC),其中34种为MVOC成分,各处理单元排放的MVOC含量占其VOC总量的95%以上;苯系物、2-丁酮、乙酸乙酯、乙酸丁酯和甲硫醚等为该污水处理厂重要的MVOC分子标志物,其中苯系物的含量最高,占源排放MVOC总量的75.89%;经归一化和重整的MVOC源成分谱与环境受体点的MVOC组成之间具有显著相关性.

GDX-502 sampling tubes,two-stage thermal desorption and gas chromatography coupled with mass spectrometry were used to investigate the composition and the content of malodor volatile organic compounds（MVOC） emitted from different processing units and the ambient sites of a typical municipal sewage treatment plant in Guangzhou.The molecular markers,atmospheric chemical reactivity,source profiles were studied.The results show that 40 volatile organic compounds（VOCs） were detected in the plant and were composed of alkanes,halogenated hydrocarbons,alkenes,aromatic hydrocarbon,OVOC and mercaptans.34 MVOC species were detected,accounting for more than 95% of the total VOCs in each processing units.Benzenes,2-Butanone,ethyl acetate,butyl acetate and dimethyl sulfide were found to be the MVOC molecular markers of the plant,while benzenes were the dominant components with the contribution of 75.89% to the measured MVOC.A strong correlation was found between the reconciliated source profile and the measured MVOC composition at the ambient receptor site.