Entrainment of E.coli and Listeria monocytogenes from sediment in irrigation canal  

作　　者：Kun Qi Erfan Ghasemi Tousi Jennifer Guohong Duan Patricia Marie Gundy Kelly Rae Bright Charles Peter Gerba 

机构地区：[1]Department of Civil&Architectural Engineering and Mechanics,The University of Arizona,1209 E.2nd St.,Tucson,AZ,USA [2]Department of Environmental Science,The University of Arizona,Water&Energy Sustainable Technology(WEST)Center,2959 W.Calle Agua Nueva,Tucson,AZ 85745,USA

出　　处：《International Journal of Sediment Research》2022年第6期701-714,共14页国际泥沙研究（英文版）

基　　金：The authors would like to thank the Center for Produce Safety for funding this research(Grant No.2019CPS04).

摘　　要：E.coli and Listeria monocytogenes(or L.monocytogenes)are bacteria affecting fresh produce that is harmful for health of humans and animals.If these bacteria are present in surface waterbody(e.g.,irrigation canals),they will impair irrigation water quality and threaten produce safety.This paper studied the resuspension of E.coli and Listeria from bed sediment into irrigation water through several sets of laboratory experiments in an open channel flume.We studied three types of sediments using several flow rates in different velocities and shear stress.Bacteria's concentration in water increases with the bed shear stress.Two empirical relations were derived to correlate the concentration of E.coli and L.monocytogenes with the dimensionless bed shear stress.The experimental data favorably verified the relationships for sandy loam,loamy sand,and loam.The results showed that both bacteria could entrain from sand more efficiently compared to other sediments(i.e.,sandy loam or loam).These relationships can be applied to water quality models for simulating E.coli and L.monocytogenes transport in irrigation canals for better managing irrigation water quality.

关 键 词：BACTERIA E.COLI L.monocytogenes Sediment transport Irrigation water Sediment model 

分 类 号：S273[农业科学—农业水土工程]