Water Purification and Clogging Phenomena Observed in Infiltration-Percolation Processes in Experimental Sand and Soil Tanks

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Infiltration-percolation processes in sands and soils were examined quantitatively and qualitatively feeding with tap water and synthetic wastewater. The experimental apparatus was designed so as to produce capillary upward flow to be followed by gravitational downward flow. Temporal changes in flow rate, water quality and permeability, and their interrelations were analyzed. The flow rate did not decrease monotonously over time under continuous feeding, but occasional catastrophic recoveries occurred seemingly as a result of status changes of microbial or nonliving organics from fixed to suspended form. In saturated sands, the flow rate depended primarily on the permeability at a thin boundary layer between sands and gravels, and water quality changed primarily within the upward flow zone. In unsaturated soils, particle size was found to be a controlling factor for water quality distribution as well as permeability distribution in the system.
山梨大学の論文