Park Junwon, Yamashita Naoyuki, Park Chulhwi, Shimono Tatsumi, Takeuchi Daniel M, Tanaka Hiroaki
Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan.
Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan.
Chemosphere. 2017 Jul;179:347-358. doi: 10.1016/j.chemosphere.2017.03.135. Epub 2017 Apr 2.
We investigated the concentrations of 57 target compounds in the different treatment units of various biological treatment processes in South Korea, including modified biological nutrient removal (BNR), anaerobic-anoxic-aerobic (A2O), and membrane bioreactor (MBR) systems, to elucidate the occurrence and removal fates of PPCPs in WWTPs. Biological treatment processes appeared to be most effective in eliminating most PPCPs, whereas some PPCPs were additionally removed by post-treatment. With the exception of the MBR process, the A2O system was effective for PPCPs removal. As a result, removal mechanisms were evaluated by calculating the mass balances in A2O and a lab-scale MBR process. The comparative study demonstrated that biodegradation was largely responsible for the improved removal performance found in lab-scale MBR (e.g., in removing bezafibrate, ketoprofen, and atenolol). Triclocarban, ciprofloxacin, levofloxacin and tetracycline were adsorbed in large amounts to MBR sludge. Increased biodegradability was also observed in lab-scale MBR, despite the highly adsorbable characteristics. The enhanced biodegradation potential seen in the MBR process thus likely plays a key role in eliminating highly adsorbable compounds as well as non-degradable or persistent PPCPs in other biological treatment processes.
我们调查了韩国各种生物处理工艺不同处理单元中57种目标化合物的浓度，这些工艺包括改良生物脱氮除磷（BNR）、厌氧-缺氧-好氧（A2O）和膜生物反应器（MBR）系统，以阐明污水处理厂中药物和个人护理产品（PPCPs）的存在情况和去除去向。生物处理工艺似乎对消除大多数PPCPs最为有效，而一些PPCPs通过后续处理得到了额外去除。除MBR工艺外，A2O系统对PPCPs的去除也很有效。因此，通过计算A2O和实验室规模的MBR工艺中的质量平衡来评估去除机制。对比研究表明，生物降解在很大程度上促成了实验室规模MBR中去除性能的提高（例如，在去除苯扎贝特、酮洛芬和阿替洛尔方面）。三氯生、环丙沙星、左氧氟沙星和四环素大量吸附在MBR污泥上。尽管具有高吸附特性，但在实验室规模的MBR中也观察到了生物降解性的提高。因此，MBR工艺中增强的生物降解潜力可能在消除高吸附性化合物以及其他生物处理工艺中不可降解或持久性的PPCPs方面发挥关键作用。
