| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災研究所 === 102 === Now, Taiwan starts running Natural Treatment System (NTS) to solve the current problems, for example, wetland and contact oxidation system, et al. However, this treatment is limited by poor hydraulic loading which gets clogging easily. Therefore, there is a new soil processing technique called Multi Soil Layering System (MSL) in Japan which provided larger load for hydraulic loading locates beneath the ground. This system efficiently improves the defect of NTS, and reduces the manual maintenance and disturbance.
MSL is mainly combined from Soil Mixing Block Layer (SML) and Permeability Layer (PL). In the case of MSL, it is use zeolite as permeable layer in Japan. The objective of this study was, however, to consider the character of localization materials and environmental protection.In this study used easily to abtain the recycling filter of material and in place of zeolite,after that it will also discuss the water cleaning experiment of MSL, and provide a reference to future engineer materials by applying filter material in the different hydraulic loadings.
From the result of experiment, the expanded clay, oyster shell and waste activated carbon systems under a 1000 L/m2/day loading rate effectively reduced the level of NH3-N and TP at percentages of more than 90%. It’s observed the processing capacity from the SS and COD, the expanded clay and the waste activated carbon system effectively reduced the level of SS at percentages of 83% and 93%, respectively. The expanded clay and the waste activated carbon system effectively reduced the level of COD at percentages of 87% and 78%, respectively. Moreover foam Lianshi and waste activated carbon systems HLR1000 ~ 3000 L/m2/day the removal performance and stability, about 90 to 95 percent of TP removal, it can increase the efficiency of phosphorus removal using a high HLR in lieu of zeolite as MSL permeable layer.
Oyster shell system in the HLR 500 ~ 800 L/m2/day SS and COD removal efficiency for better performance, but still inside the water purifying organic matter will affect the color. However, the effect of oyster shell system for the removal of nutrients, can indeed replace zeolite, and can greatly reduce the cost of assembling MSL system use in large-scale engineering.
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