DEGRADATION OF ORGANIC POLLUTANTS IN FLOCCULATED LIQUID DIGESTATE USING PHOTOCATALYTIC TITANATE NANOFIBERS: MECHANISM AND RESPONSE SURFACE OPTIMIZATION  

作　　者：Yiting XIAO Yang TIAN Yuanhang ZHAN Jun ZHU 

机构地区：[1]Department of Biological and Agricultural Engineering,University of Arkansas,Fayetteville,AR 72701,USA [2]Material Science and Engineering Programs,University of Arkansas,Fayetteville,AR 72701,USA

出　　处：《Frontiers of Agricultural Science and Engineering》2023年第3期492-502,共11页农业科学与工程前沿（英文版）

基　　金：supported by the Arkansas Agriculture Experiment Station of the University of Arkansas Division of Agriculture,the Center for Agricultural and Rural Sustainability,and the Graduate Professional Student Congress Tiffany Marcantonio Research Grant.

摘　　要：Titanate nanofibers(TNFs)were synthesized using a hydrothermal method and were employed for the first time in this study to photocatalytically degrade organic pollutants found in flocculated liquid digestate of poultry litter.The photocatalytic performance of TNFs,with a bandgap of 3.16 eV,was tested based on degradation of organic pollutants and removal of color.Five combinations of pollutant concentration and pH were examined(0.2 to 1.3 g·L^(−1) at pH 4 to 10).Central composite design(CCD)and response surface methodology(RSM)were applied in order to optimize the removal rates of volatile fatty acids(VFA)and chemical oxygen demand(COD),and the decolorization rate.There were no significant differences between the regression models generated by the CCD/RSM and the experimental data.It was found that the optimal values for pH,dosage,VFA removal rate,COD removal rate and decolorization rate were 6.752,0.767 g·L^(−1),72.9%,59.1%and 66.8%,respectively.These findings indicates that photocatalytic TNFs have potential for the posttreatment of anaerobic digestion effluent,as well as other types of wastewater.

关 键 词：titanate nanofibers PHOTOCATALYSIS poultry litter liquid digestate 

分 类 号：X70[环境科学与工程—环境工程]