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.
Department of Geography, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
Chemosphere. 2018 Jan;190:358-367. doi: 10.1016/j.chemosphere.2017.10.001. Epub 2017 Oct 3.
This study aimed at investigating the removal efficiencies of perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS) and bisphenol A (BPA) of two major sewage treatment works in Hong Kong: Stonecutters Island STW (SCISTW) which adopts chemically enhanced primary treatment (CEPT) process and Sha Tin STW (STSTW) which employs biological treatment. Liquid portion (LP) and particulate matter (PM) of liquid sewage samples and sludge samples were collected and followed by liquid chromatograph system. It was found that BPA (44.6 ± 35.1%) generally achieved higher TRE than the two other chemicals (PFOS (-18.8 ± 34.8%) and PFOA (-104 ± 86.8%)) in STSTW (p < 0.05). Most of the PFOA, PFOS and BPA was discharged through final effluent (PFOA: 95.6 ± 1.00% and 94.5 ± 3.13%; PFOS: 77.7 ± 1.48% and 72.6 ± 6.07%; BPA: 99.2 ± 0.950% and 92.8 ± 7.25%, respectively) rather than stored in the sludge/cake (PFOA: 4.45 ± 1.00% and 5.47 ± 3.13%, PFOS: 22.3 ± 1.48% and 27.4 ± 6.07%, BPA: 0.844 ± 0.950% and 7.20 ± 7.25%, respectively). After the sewage purification process, the two STW released considerable amounts of PFOA, PFOS and BPA in the final effluent (PFOA: 0.638 ± 0.227 kg/year; PFOS: 0.409 ± 0.126 kg/year; BPA: 10.4 ± 3.83 kg/year in STSTW; PFOA: 3.08 ± 1.415 kg/year; PFOS: 2.13 ± 0.452 kg/year; BPA: 714 ± 768 kg/year in SCISTW) and in the sludge (PFOA: 0.0360 ± 0.0250 kg/year; PFOS: 0.149 ± 0.00100 kg/year; BPA: 1.09 ± 1.47 kg/year in STSTW; PFOA: 0.139 ± 0.0670 kg/year; PFOS: 0.606 ± 0.0780 kg/year; BPA: 3.05 ± 3.95 kg/year in SCISTW). This study may help to provide crucial information for further development of municipal sewage system in treating synthetic emerging chemicals.
本研究旨在探讨香港两个主要污水处理厂（石门污水处理厂（SCISTW）采用化学强化一级处理（CEPT）工艺，以及沙田污水处理厂（STSTW）采用生物处理）对全氟辛烷酸（PFOA）、全氟辛烷磺酸（PFOS）和双酚 A（BPA）的去除效率。采集了污水样品的液相（LP）和固相（PM）以及污泥样品，随后进行液相色谱系统分析。结果表明，在 STSTW 中，BPA（44.6±35.1%）的总去除率普遍高于后两种化学物质（PFOS（-18.8±34.8%）和 PFOA（-104±86.8%））（p<0.05）。大部分的 PFOA、PFOS 和 BPA 通过最终出水（PFOA：95.6±1.00%和 94.5±3.13%；PFOS：77.7±1.48%和 72.6±6.07%；BPA：99.2±0.950%和 92.8±7.25%）排放，而不是储存在污泥/饼中（PFOA：4.45±1.00%和 5.47±3.13%；PFOS：22.3±1.48%和 27.4±6.07%；BPA：0.844±0.950%和 7.20±7.25%）。经过污水净化处理后，两个 STW 在最终出水中释放了相当数量的 PFOA、PFOS 和 BPA（PFOA：0.638±0.227kg/年；PFOS：0.409±0.126kg/年；BPA：10.4±3.83kg/年在 STSTW 中；PFOA：3.08±1.415kg/年；PFOS：2.13±0.452kg/年；BPA：714±768kg/年在 SCISTW）和污泥中（PFOA：0.0360±0.0250kg/年；PFOS：0.149±0.00100kg/年；BPA：1.09±1.47kg/年在 STSTW 中；PFOA：0.139±0.0670kg/年；PFOS：0.606±0.0780kg/年；BPA：3.05±3.95kg/年在 SCISTW）。本研究可能有助于为进一步发展处理合成新兴化学品的城市污水系统提供重要信息。
