Disinfection of dairy wastewater effluent through solar photocatalysis processes

作     者：Mojtaba Afsharnia Mojtaba Kianmehr Hamed Biglari Abdollah Dargahi Abdolreza Karimi 

作者机构：Faculty of Health Gonabad University of Medical Sciences Faculty of Medicine Gonabad University of Medical Sciences Faculty of Health Kermanshah University of Medical Sciences Faculty of Engineering Qom University of Technology 

出 版 物：《Water Science and Engineering》 (水科学与水工程（英文版）)

年 卷 期：2018年第11卷第3期

页      面：214-219页

核心收录：

学科分类：08[工学] 0707[理学-海洋科学] 0815[工学-水利工程] 0813[工学-建筑学] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 

基　　金：supported by the Foundation of the Gonabad University of Medical Sciences in Gonabad Iran(Grant No.92131) 

主　　题：Dairy wastewater Disinfection Photocatalyst Solar Photolysis and photocatalysis TiO2 

摘      要：Due to the strict regulations and reuse policies that govern wastewater s use as an irrigation water resource for agricultural purposes, especially in dry climates, optimization of the disinfection process is of the utmost importance. The effects of solar radiation along with Titanium dioxide(TiO_2) nanoparticles applied to optimization of the photolysis and photocatalysis processes for inactivating heterotrophic bacteria were investigated. Temperature, p H, and dissolved oxygen fluctuations in the dairy wastewater effluent treated by activated sludge were examined. In addition,different dosages of TiO_2 were tested in the solar photocatalysis(ph-C S) and concentrated solar photocatalysis(ph-C CS) processes. The results show that the disinfection efficiencies of the solar photolysis(ph-L S) and concentrated solar photolysis(ph-L CS) processes after 30 min were about 10.5% and 68.9%, respectively, and that the ph-C S and ph-C CS processes inactivated 41% and 97% of the heterotrophic bacteria after 30 min, respectively. The p H variation in these processes was negligible. Using the ph-L CS and ph-C CS processes, the synergistic effect between the optical and thermal inactivation caused complete disinfection after three hours. However, disinfection was faster in the ph-C CS process than in the ph-L CS process. Significant correlations were found between the disinfection efficiency and the variation of the dissolved oxygen concentration in the ph-C S and ph-C CS processes, while the correlations between the disinfection efficiency and temperature variation were not significant in the ph-L S and ph-C S processes. Moreover, the oxygen consumption rate was greatest(3.2 mg··L^(-1)) in the ph-C CS process. Hence,it could be concluded that the ph-C CS process is an efficient photocatalysis process for disinfection of dairy wastewater effluent.