The in-situ wastewater treatment system was developed in Japan in recent years. The wastewater was treated by flow into the multi-soil-layer systems. This project was to investigate the function and behavior of multi-soil-layer systems under Taiwan’s engineering environment and construction culture. The physical properties of foundational materials including size distribution, specific gravity, maximum and minimum unit weights, permeability and strength parameters were studied. The geotechnical centrifuge modeling was used to understand the flow path and flow rate at 10 g artificial acceleration field. Then the centrifuge testing results were compared with the numerical simulations for calibrating the input parameters. Therefore, the parameter study was performed to find the proper arrangement for permeable layers and mixture blocks of multi-soil-layer systems. A 1 g model was conducted and the water treatment performance was evaluated by measuring the difference in the wastewater and the water sampled at different locations of system based on the optimum arrangement from parameter study. Finally, a design and construction guidelines of multi-soil-layer systems would be established resulting from the past studies and this project. This system would be built wildly at the suitable place for water treatment and to enhance the health of people and the safety use of water.

multi-soil-layer, water treatment, costruction specification