Role of sand size on bacterial retention in biochar-amended sand filters

作     者：Carl H.Bolster 

作者机构：USDA-ARS2413 Nashville Rd.B-5Bowling GreenKY 42101USA 

出 版 物：《Biochar》 (生物炭（英文）)

年 卷 期：2019年第1卷第4期

页      面：353-363页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：This research was part of USDA-ARS National Program 212:Soil and Air 

主　　题：Biochar E.coli Salmonella Sand filter 

摘      要：The addition of biochar to sand columns can enhance the retention of bacteria and thus may provide a management strategy for removing bacteria from tile-drainage *** this study,the role of sand size as a factor in controlling microbial reten-tion in biochar-amended sand columns was *** column experiments were conducted to quantify the removal of two bacterial isolates(*** and Salmonella)and polystyrene microspheres in 10-cm-long columns packed with clean sand of three different sizes(0.25,0.71,and 1.19 mm)at four biochar concentrations(0%,5%,10%,and 15%).Sorption studies were also performed to help identify the relative roles of sorption and physical straining on the removal of bacteria and microspheres within the *** the large sand,the log10 removal values(LRV)for *** increased from 0.22 to 0.49 for the 0%and 15%biochar concentrations,respectively,while LRV for Salmonella increased from 0.19 to *** the small sand,increasing biochar concentration from 0%to 15%increased LRV from 0.11 to 1.9 for *** and from 0.20 to 4.6 for *** comparison,LRV for microspheres in the 15%biochar columns was only minimally higher than the unamended columns for all three sand *** from the sorption studies show that high sorption coefficients generally correlated with high LRV indicating that sorption rather than physical straining was the primary mechanism of retention in the *** from this study further our understanding of bacterial retention in biochar-amended porous media.