Liao Xiaobin, Zou Rusen, Chen Chao, Yuan Baoling, Zhou Zhenming, Zhang Xiaojian
a Institute of Municipal and Environmental Engineering, College of Civil Engineering , Huaqiao University , Xiamen , People's Republic of China.
b State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing , People's Republic of China.
Environ Technol. 2018 Jan;39(2):221-230. doi: 10.1080/09593330.2017.1297850. Epub 2017 Mar 8.
It is the priority to guarantee biosafety for drinking water treatment. The objective of this study was to evaluate the impact of widely applied conventional and ozone-biological activated carbon (O-BAC) advanced treatment technology on biosafety of drinking water. The items, including assimilable organic carbon (AOC), biodegradable dissolved organic carbon (BDOC), heterotrophic plate counts (HPCs) and the microorganism community structures, were used to evaluate the biosafety. Moreover, their relationships with molecular weights (MWs) and fluorescence intensity of dissolved organic matter were investigated. The results indicated that the technology provided a considerable gain in potable water quality by decreasing dissolved organic carbon (DOC, from 5.05 to 1.71 mg/L), AOC (from 298 to 131 μg/L), BDOC (from 1.39 to 0.24 mg/L) and HPCs (from 275 to 10 CFU/mL). Ozone brought an increase in DOC with low MW <1 kDa, which accompanies with an increase in AOC/BDOC concentration, which could be reduced effectively by subsequent BAC process. The formation of AOC/BDOC was closely related to DOC with low MWs and aromatic protein. Bacteria could be released from BAC filter, resulting in an increase in HPC and the presence of pathogenic bacteria in effluent, while the post sand filter could further guarantee the biosafety of finished water.
保障饮用水处理中的生物安全是首要任务。本研究的目的是评估广泛应用的常规处理和臭氧 - 生物活性炭（O - BAC）深度处理技术对饮用水生物安全的影响。采用可同化有机碳（AOC）、可生物降解溶解性有机碳（BDOC）、异养平板计数（HPCs）和微生物群落结构等指标来评估生物安全。此外，还研究了它们与溶解有机物的分子量（MWs）和荧光强度之间的关系。结果表明，该技术通过降低溶解有机碳（DOC，从5.05降至1.71mg/L）、AOC（从298降至131μg/L）、BDOC（从1.39降至0.24mg/L）和HPCs（从275降至10CFU/mL），使饮用水水质有了显著提升。臭氧使分子量<1kDa的低分子量DOC增加，同时伴随着AOC/BDOC浓度的增加，后续的BAC工艺可有效降低这种增加。AOC/BDOC的形成与低分子量DOC和芳香族蛋白质密切相关。细菌可能从BAC滤池中释放出来，导致HPC增加以及出水中存在病原菌，而后置砂滤池可进一步保障成品水的生物安全。
