Destruction of fecal bacteria in wastewater by three photosensitizers
Destruction of fecal bacteria in wastewater by three photosensitizers
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DOI：
10.1039/b204637g
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发表时间：
2002-01-01
影响因子：
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通讯作者：
Gueddari, M
中科院分区：
文献类型：
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作者：
Jemli, M;Alouini, Z;Gueddari, M
突尼斯的农业面临着由有限的常规水资源造成的严重水质和水量问题。科普水资源短缺的一种可能性是净化废水以供再利用。在废水消毒的不同方法中，使用光敏剂（玫瑰红，亚甲蓝，阳离子卟啉）与阳光的组合在小规模上测定了粪大肠菌群的灭活。在相同的条件下，也遵循并行的敏化剂光漂白。结果表明，中位取代的阳离子卟啉比亚甲基蓝和玫瑰红具有更好的光稳定性和更高的光降解效率。较低的阳离子卟啉浓度，1 μ M，导致非常少的细胞死亡。更高的浓度，5 μ M或10 μ M，产生更多的细胞死亡。然而，浓度5和10 μ M之间存在小的差异。通过增加照射的持续时间，我们可以改善细菌的对数减少，并补偿低浓度的敏化剂或效率较低的敏化剂类型。在处理的第四小时期间，用5和10 μ M阳离子卟啉获得粪便细菌的相同对数减少。
Agriculture in Tunisia faces acute problems of water quality and quantity caused by limited conventional water resources. One possibility to cope with low water resources is to purify wastewater for reuse. Among different methods for the disinfection of wastewater, the inactivation of fecal coliforms using a combination of a photosensitiser (Rose Bengal, Methylene Blue, cationic porphyrin) with sunlight was determined on a small scale. In parallel the sensitizer photobleaching was also followed under the same conditions. The results described in this paper show that the meso-substituted cationic porphyrin is more efficient and more photostable than Methylene Blue and Rose Bengal in wastewater. A lower cationic porphyrin concentration, 1 muM, resulted in very little cell death. Higher concentrations, 5 muM or 10 muM, produced more cell death. Nevertheless there was a small difference between concentrations 5 and 10 muM. By increasing the duration of irradiation we can improve the log reduction in bacteria and compensate for a low concentration of sensitizer or for a less efficient type of sensitizer. The same log reduction in fecal bacteria was obtained with 5 and 10 muM of cationic porphyrin during the fourth hour of treatment.