Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa; Department of Environmental, Water and Earth Sciences, Tshwane University of Technology, Pretoria, South Africa.
Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa.
Sci Total Environ. 2017 Dec 1;601-602:626-635. doi: 10.1016/j.scitotenv.2017.05.204. Epub 2017 May 31.
The use of solar and ultraviolet titanium dioxide photocatalytic ozonation processes to inactivate waterborne pathogens (Escherichia coli, Salmonella species, Shigella species and Vibrio cholerae) in synthetic water and secondary municipal wastewater effluent is presented. The performance indicators were bacterial inactivation efficiency, post-disinfection regrowth and synergy effects (collaboration) between ozonation and photocatalysis (photocatalytic ozonation). Photocatalytic ozonation effectively inactivated the target bacteria and positive synergistic interactions were observed, leading to synergy indices (SI) of up to 1.86 indicating a performance much higher than that of ozonation and photocatalysis individually (SI≤1, no synergy; SI>1 shows synergy between the two processes). Furthermore, there was a substantial reduction in contact time required for complete bacterial inactivation by 50-75% compared to the individual unit processes of ozonation and photocatalysis. Moreover, no post-treatment bacterial regrowth after 24 and 48h in the dark was observed. Therefore, the combined processes overcame the limitations of the individual unit processes in terms of the suppression of bacterial reactivation and regrowth owing to the fact that bacterial cells were irreparably damaged. The treated wastewater satisfied the bacteriological requirements in treated wastewater for South Africa.
本研究采用太阳能和紫外线二氧化钛光催化臭氧氧化工艺对合成水和二级城市污水中的水生病原体（大肠杆菌、沙门氏菌、志贺氏菌和霍乱弧菌）进行灭活。研究的性能指标包括细菌灭活效率、消毒后再生和臭氧氧化与光催化（光催化臭氧氧化）之间的协同效应（协同作用）。光催化臭氧氧化有效地灭活了目标细菌，并观察到了积极的协同相互作用，协同指数（SI）高达 1.86，表明其性能远高于单独的臭氧氧化和光催化（SI≤1，无协同作用；SI>1 表示两个过程之间存在协同作用）。此外，与单独的臭氧氧化和光催化单元工艺相比，完全灭活细菌所需的接触时间减少了 50-75%。此外，在黑暗中 24 和 48 小时后没有观察到细菌再生。因此，与单独的单元工艺相比，联合工艺克服了抑制细菌再激活和再生的局限性，因为细菌细胞受到了不可修复的损伤。处理后的废水满足南非处理后废水的细菌学要求。
