Evaluation on characteristics of antibacterial lightweight materials by water purification sludge and paper mill sludge calcined ash.

• Main Authors: Chun-Wei Wu, 吳浚瑋
• Other Authors: Kung-Yuh Chiang
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/4q66h9

碩士 === 國立中央大學 === 環境工程研究所 === 107 === This study investigates the characterization of antibacterial lightweight material manufactured by water purification sludge and paper mill calcined ash by autoclaving technique with controlling conditions under steam pressure 0.9 MPa, reaction time 8 hr, Ca/Si ratio ranged from 0.33 to 1.51, humidity control and curing 14 days (room temperature: 25℃and humidity: 70%). This research also investigates the antibacterial materials properties evaluated by the Penicillium funiculosum with controlled day-night cycle (12 hr each), humidity control (day:65% and night:75%), and culturing 28 days. The coverage of Penicillium funiculosum on the surface of the lightweight material is widely used as a quantitative indicator for evaluating the performance of the antibacterial materials properties. In the case of Ca/Si ratio 1.51 and curing by humidity control, the experimental results indicated that the lightweight material has not only met the criteria of relevant autoclaving lightweight material with bulk density (1.00g/cm3) and apparent porosity (60.44%), but also has the good performance of compressive strength (higher than 41kg/cm2).The identified mainly crystal phases of the lightweight material are calcium silicon hydrate (C-S-H) and calcium carbonate (Calcite). According to the analysis results of 28 days antibacterial performance test, compared with the uncoated and titanium dioxide (TiO2) blended samples, the samples surface coating TiO2 has a good photocatalytic and antibacterial characteristics. In the case of uncoated and TiO2 blended samples, the coverage of Penicillium funiculosum on the surface of lightweight are 20.96% and 21.82%, respectively. The lightweight materials coating 0.1% TiO2 could perform the good antibacterial characteristics corresponding with lowest coverage of Penicillium funiculosum (approximately 3.34%). In this study, the prepared antibacterial lightweight materials could provide the good photocatalytic characteristics to inhibit the growth of Penicillium funiculosum. In summary, the prepared antibacterial lightweight materials have a good potential for applying the building and construction work in the future.