Profiles and removal efficiency of polycyclic aromatic hydrocarbons by two different types of sewage treatment plants in Hong Kong  

作　　者：Yu Bon Man Ka Lai Chow Zhang Cheng Wing Yin Mo Yung Hau Chan James Chung Wah Lam Frankie Tat Kwong Lau Wing Cheong Fung Ming Hung Wong 

机构地区：[1]Consortium on Health,Environment,Education and Research(CHEER),and Department of Science and Environmental Studies,The Education University of Hong Kong,Tai Po,Hong Kong,China [2]Department of Environmental Engineering,Jinan University,Guangzhou 510630,China [3]State Key Laboratory in Marine Pollution,Croucher Institute for Environmental Sciences,Hong Kong Baptist University and City University of Hong Kong,Kowloon Tong,Hong Kong,China [4]Department of Geography,Hong Kong Baptist University,Kowloon Tong,Hong Kong,China [5]College of Environment,Sichuan Agricultural University,Chengdu 611130,China [6]State Key Laboratory in Marine Pollution and Research Centre for the Oceans and Human Health,City University of Hong Kong,Kowioon Tong,Hong Kong,China [7]The Drainage Services Department,The Government of the Hong Kong Special Administrative Region,Hong Kong,China

出　　处：《Journal of Environmental Sciences》2017年第3期196-206,共11页环境科学学报（英文版）

基　　金：Financial support from the Drainage Services Department,the Government of the Hong Kong SAR(nos.DEMP/2011/04,DEMP/2014/03 and DEMP/2015/01);the Open Science Research Fund of State Key Laboratory in Marine Pollution(no.OSRF/0001);the Start-up Research Grant for Newly Recruited Professors/(Research)Chair Professors;The Education University of Hong Kong(no.RG24/13-14R)is gratefully acknowledged

摘　　要：Sewage discharge could be a major source of polycyclic aromatic hydrocarbons （PAHs） in the coastal waters. Stonecutters Island and Shatin Sewage Treatment Works （SCISTW and STSTW） in Hong Kong, adopted chemically enhanced primary treatment and biological treatment, respectively. This study aimed at （1） determining the removal efficiencies of PAHs, （2） comparing the capabilities in removing PAHs, and （3） characterizing the profile of each individual PAHs, in the two sewage treatment plants （STPs）. Quantification of 16 PAHs was conducted by a Gas Chromatography. The concentrations of total PAHs decreased gradually along the treatment processes （from 301 ± 255 and 307 ± 217 ns/L to 14.9 ± 12.1 and 63.3 ± 54.1 ng/L in STSTW and SCISTW, respectively）. It was noted that STSTW was more capable in removing total PAHs than SCISTW with average total removal effidency 94.4% ± 4.12% us. 79.2% ± 7.48% （p 〈 0.05）. The removal of PAHs was probably due to sorption in particular matter, confirmed by the higher distribution coefficient of individual and total PAHs in solid samples （dewatered sludge contained 92.5% and 74.7% of total PAHs in SCISTW and STSTW, respectively） than liquid samples （final efffluent-total contained 7.53% and 25.3% of total PAHs in STSTW and SCISTW, respectively）. Despite the impressive capability of STSTW and SCISTW in removing PAHs, there was still a considerable amount of total PAHs （1.85 and 39.3 ks/year, respectively for the two STPs） being discharged into Hone Kon coastal waters, which would be an environmental concern.Sewage discharge could be a major source of polycyclic aromatic hydrocarbons （PAHs） in the coastal waters. Stonecutters Island and Shatin Sewage Treatment Works （SCISTW and STSTW） in Hong Kong, adopted chemically enhanced primary treatment and biological treatment, respectively. This study aimed at （1） determining the removal efficiencies of PAHs, （2） comparing the capabilities in removing PAHs, and （3） characterizing the profile of each individual PAHs, in the two sewage treatment plants （STPs）. Quantification of 16 PAHs was conducted by a Gas Chromatography. The concentrations of total PAHs decreased gradually along the treatment processes （from 301 ± 255 and 307 ± 217 ns/L to 14.9 ± 12.1 and 63.3 ± 54.1 ng/L in STSTW and SCISTW, respectively）. It was noted that STSTW was more capable in removing total PAHs than SCISTW with average total removal effidency 94.4% ± 4.12% us. 79.2% ± 7.48% （p 〈 0.05）. The removal of PAHs was probably due to sorption in particular matter, confirmed by the higher distribution coefficient of individual and total PAHs in solid samples （dewatered sludge contained 92.5% and 74.7% of total PAHs in SCISTW and STSTW, respectively） than liquid samples （final efffluent-total contained 7.53% and 25.3% of total PAHs in STSTW and SCISTW, respectively）. Despite the impressive capability of STSTW and SCISTW in removing PAHs, there was still a considerable amount of total PAHs （1.85 and 39.3 ks/year, respectively for the two STPs） being discharged into Hone Kon coastal waters, which would be an environmental concern.

关 键 词：Sewage treatment plantsPAHsRemoval efficiencySludgeSewage 

分 类 号：X703[环境科学与工程—环境工程]