| Summary: | 碩士 === 國立宜蘭大學 === 環境工程學系碩士班 === 101 === Sanitary landfills are commonly used to dispose silicon-contained waste sludge and ash, but rapid urbanization has made locating suitable landfill sites increasingly difficult in Taiwan. Increasing demand for natural resources and a scarcity of environmentally acceptable solid waste disposal sites are motivating numerous municipalities in Taiwan to consider resource recovery as an alternative. In this study, the following operating conditions are applied to developing humidity control porous ceramic products; a sintering temperature of 750-1,250oC and a percentage of silicon-contained waste sludge and ash (waste fiberglass, coal fly ash, sewage sludge ash and sodium silicate sand) in waste diatomite of 0-40%. The brick samples then underwent the flexural strength test, to determine their quality in comparison to the Chinese National Standards (CNS 3298) methods. Their micro-structures, their crystal structures and the volumes of their pores were determined by X-ray diffraction, scanning electron microscopy and Brunauer, Emmett and Teller, respectively. The TCLP leaching concentrations for the materials met the EPA’s current regulatory thresholds. XRD patterns of silicon-contained waste sludge and ash were mainly composed of Quartz. Nitrogen adsorption desorption isotherms showed a hydrophobic behavior (type H3 isotherm). The samples showed at pore sizes of approximately 2-11 nm. Waste catalyst that contained 10-20% silicon-contained waste sludge and ash substantially reduce the volume of internal pores, the powder partially melted and slight fusion occurred at the particle contact points. The Pearson relation indicated that the sintering temperature increased as porosity decreased. Increasing the gel/space ratio, increased the amounts of hydration products, and the consequent synergistic effect of sintered products in internal pores and specific area of sintered sample enhanced water vapor adsorption/desorption and hygroscopic sorption. The water vapor adsorption/desorption and hygroscopic sorption properties were satisfying with the JIS A1470, 1475 intensity specification of building materials (＞29 g/m2, 5 kg/m3). When the waste fiberglass contained 20-30% waste catalyst (sintering temperature of 850-950oC), the coal fly ash contained 20-30% waste catalyst (sintering temperature of 950-1000oC), the sewage sludge ash contained 20-30% waste catalyst (sintering temperature of 1000-1050oC) and the sodium silicate sand contained 10-30% waste catalyst (sintering temperature of 1100oC) sintered samples met JIS A1470, 1475 intensity specification of building materials (＞29 g/m2, 5 kg/m3).
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