Column Analyses of Chloride Breakthrough and Lead Retention in Amended Sandy Soils  

作　　者：Mark E. Grismer Michael P. Hogan Dave E. Steinfeld 

机构地区：[1]Department of Hydrologic Sciences and Biological ＆ Agricultural Engineering, Davis, CA 95616, USA [2]Integrated Environmental Resource Services, Tahoe City, CA 96145, USA [3]USDA- Forest Service, Portland, OR 97204, USA

出　　处：《Journal of Environmental Science and Engineering(A)》2012年第4期503-513,共11页环境科学与工程（A）

摘　　要：Stormwater quality design manuals lack scientifically creditable bases for many novel LID （Low-Impact Development） designs presently proposed to meet stormwater runoff management requirements. Potential stormwater pollutant adsorption and infiltration enhancement capabilities of forest-derived by-products （e.g. woodchips, bio-char） provide an opportunity to combine these readily availability materials into stormwater quality designs. On-site stormwater runoff treatment through determination of the soil-water transport and lead （Pb） retention capacity of two sandy soils from Oregon is considered. Using synthetic stormwater （-120 mg CI/L and -5 mg Pb/L） displacement tests in pairs ofABS （Acrylonitrile butadiene styrene） soil columns （75 mm dia by 0.46 m tall） with upward flow （to minimize air entrapment） saturated hydraulic conductivity, chloride dispersion and Pb retention by plain and amended soils is evaluated. Generally, soil amendment incorporation （woodchips, compost or biochar） as compared to an amendment layer resulted in improved hydraulic conductivities as compared to that of the soil alone. Chloride breakthrough curves verified that resident soil-water displacement occurred with 0.9 to 1.6 pore volumes and residence times for most columns were 15-30 minutes. No synthetic stormwater Pb ＂breakthrough＂ within the displaced or replaced soil-water was found, rather most Pb was adsorbed within the first 150 mm of soil.

关 键 词：REVEGETATION chloride dispersion STORMWATER BIORETENTION LID. 

分 类 号：TQ242.1[化学工程—有机化工] S792.11[农业科学—林木遗传育种]