Abstract：Sewage treatment plant could be a potential exposure to volatile organic compounds (VOCs) in urban environment. Raw water samples were collected from the inlet of a municipal sewage treatment plant in Guangzhou and were analyzed by purge-trap concentrator and high-resolution gas chromatography coupled with mass spectrometry. 20individual compounds were discovered with a concentration ranged from approximately 0.1789 to 21.89mg/L in the inlet water. The emission rates and the total amount were calculated employing the model of WATER9 based on the measured data and units structural parameters. Among the four processes (A-B process, UNITANK processes, improved A2/O process concentrated on nitrogen and phosphorus removal, improved A2/O process with efficient sedimentation tank), A-B process had the highest emission rate of 0.2318g/s, while the covered A2/O process with efficient sedimentation tank had the lowest emission rate of 0.0426g/s. The biological tank and sedimentation tank were the two major units that contributed the largest VOCs emission in all the units and the most abundant VOCs consisted of Benzene, toluene, chloroform and tetrachloroethylene. The emission factors of covered and uncovered units were calculated by WATER9 model based on emission rates and sewage treatment amounts and VOCs emissions of sewage treatment plants in Pearl River Delta region were estimated as well, the results indicated that covered units will greatly reduce the amount of VOCs emissions with the reduction rate up to 74.72%.
耿雪松, 张春林, 王伯光. 城市污水处理厂污水处理工艺对VOCs挥发特征影响[J]. 中国环境科学, 2015, 35(7): 1990-1997.
GENG Xue-Song, ZHANG Chun-Lin, WANG Bo-Guang. Effects of treatment processes on the emission characteristics of volatile organic compounds(VOCs) in a municipal sewage treatment plant. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(7): 1990-1997.
