Bacteria Disinfection and Inactivation Using Zero-valent Iron, Lemon Juice, and Sunlight

本研究的目的是研究在零价铁和/或柠檬酸存在下，太阳能消毒(SODIS)过程中大肠杆菌和大肠菌群的灭活/消毒效率。一系列批量实验的结果表明，在本研究的实验条件下，既不单独使用UV-A(365 nm波长)，也不使用零价铁，也不使用柠檬酸，都能有效地降低活菌和大肠菌群的比例。然而，在UV-A照明期间同时添加零价铁和柠檬酸有效地减少了活的大肠杆菌和大肠菌群的比例，这意味着这三种物质的共存是有效产生羟基自由基和铁离子等氧化剂所必需的。现场实验也证明，本研究提出的技术可以很容易地在我们的日常生活中实施，使用富含柠檬酸的柠檬汁。

The objective of this study was to investigate the inactivation/disinfection efficiencies of E.coli and coliforms during the solar disinfection (SODIS) process with the presence of zero-valent iron and/or citric acid. The experimental results from a series of batch experiments showed that a treatment with neither sole UV-A (365 nm wavelength), zero-valent iron, nor citric acid effectively decreased the fraction of viable E.coli and coliforms under the experimental conditions investigated in this study. However, the simultaneous addition of zero-valent iron and citric acid during the UV-A illumination effectively decreased the fraction of viable E.coli and coliforms, meaning the co-existence of these three are required to effectively produce oxidants such as hydroxyl radical and ferryl ion. It was also demonstrated through field experiments that the technology proposed in this study can be easily implemented in our daily life using lemon juice rich in citric acid.