Colloid Enhanced Transport and Desorption of Contaminants Through Macropores in Kentucky Soils PDF Download
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Author: Christopher Douglas Barton
Publisher:
ISBN:
Category : Soil colloids
Languages : en
Pages : 318
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Author: Christopher Douglas Barton
Publisher:
ISBN:
Category : Soil colloids
Languages : en
Pages : 318
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 700
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Author:
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ISBN:
Category :
Languages : en
Pages :
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Rainfall experiments were conducted using intact soil cores and an instrumented soil pedon to examine the effect of physical heterogeneity and rainfall characteristics on the mobilization of colloids, organic matter, cesium, and strontium in a fractured soil. To measure the spatial variability of infiltration of colloids and contaminants, samples were collected through a 19-port grid placed below the soil core in laboratory study and in 27 samplers at multiple depths in the soil pedon in the field study. Cesium and strontium were applied to the soil cores and the soil pedon prior to mobilization experiments. Rainwater solutions of multiple ionic strengths and organic matter concentrations were applied to the soil cores and soil pedon to mobilize in situ colloids, cesium, and strontium. The mobilization of colloids and metal cations occurred through preferential flow paths in the soil cores. Compared to steady rainfall, greater amounts of colloids were mobilized during rainfall interrupted by pauses, which indicates that the supply of colloids to be mobilized was replenished during the pauses. A maximum in the amount of mobilized colloids were mobilized during a rainfall following a pause of 2.5 d. Pauses of shorter or longer duration resulted in less colloid mobilization. Freeze-thaw cycles, a transient condition in winter, enhanced colloid mobilization and colloid-facilitated transport of cesium and strontium in the soil cores. The exchange of solutes between the soil matrix and macropores caused a hysteretic mobilization of colloids, cesium, and strontium during changes in ionic strength. Colloid-facilitated mobilization of cesium and strontium was important at low ionic strength in fractures where slow flow allowed greater exchange of flow between the fractures and the surrounding matrix. The release of cesium and strontium by cation exchange occurred at high ionic strength in fractures where there is a little exchange of pore water with the surrounding matrix. The results of the field experiment suggested that ion exchange, and not organic matter- or colloid-facilitated transport, was the dominant mechanism for mobilization of cesium and strontium through the macropores of the fractured soil.
Author:
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ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 784
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Author:
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ISBN:
Category : Fertilizers
Languages : en
Pages : 1258
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Author:
Publisher:
ISBN:
Category : Soil pollution
Languages : en
Pages : 182
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Author: Douglas A. Haith
Publisher:
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Category : Agricultural pollution
Languages : en
Pages : 484
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Author: Leonard F. DeBano
Publisher:
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Category : Soil absorption and adsorption
Languages : en
Pages : 26
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Author: Johannes Lehmann
Publisher: Routledge
ISBN: 1136571213
Category : Business & Economics
Languages : en
Pages : 449
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Biochar is the carbon-rich product when biomass (such as wood, manure or crop residues) is heated in a closed container with little or no available air. It can be used to improve agriculture and the environment in several ways, and its stability in soil and superior nutrient-retention properties make it an ideal soil amendment to increase crop yields. In addition to this, biochar sequestration, in combination with sustainable biomass production, can be carbon-negative and therefore used to actively remove carbon dioxide from the atmosphere, with major implications for mitigation of climate change. Biochar production can also be combined with bioenergy production through the use of the gases that are given off in the pyrolysis process. This book is the first to synthesize the expanding research literature on this topic. The book's interdisciplinary approach, which covers engineering, environmental sciences, agricultural sciences, economics and policy, is a vital tool at this stage of biochar technology development. This comprehensive overview of current knowledge will be of interest to advanced students, researchers and professionals in a wide range of disciplines.
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Category : Drinking water
Languages : en
Pages : 260
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