| 摘要: | 本研究發現於不同下水污泥灰之特定燒成溫度下（1,050℃?1,150℃），矽氧晶相含量將影響到骨材發泡輕質化的結果，而矽氧晶相中之玻璃相，則影響到輕質化效果之重要因子。在同一燒成溫度下，玻璃相含量愈多，則骨材體積膨脹與孔隙率增加，但密度與抗壓強度則降低；而石英相含量對骨材發泡輕質化效果，則有相反的影響，此乃因發泡輕質化作用需要足量的黏滯性玻璃相來包覆氣體，方能達成輕質化的效果。此外，除矽氧晶相變化外，骨材輕質化仍受燒製溫度、石英與玻璃相物質含量、助熔劑含量等影響。另藉由調質以改變燒結體的主成份，則可降低燒結溫度或輕質發泡的效果，惟不論使用石英砂、玻璃質或焚化飛灰等各式資材進行調質，燒結溫度仍為控制輕質發泡的主要關鍵因子。 The study found that the content of SiO2 in different sewage sludge ash affects the bloating effect of aggregates in the specific sintering temperature (1,050℃?1,150℃), and the glass phase material of SiO2 further dominates the lightweight effect during the sintering process. The porosity and volume expanding rate of aggregates increase as the content of the glass phase materials in the sewage sludge ash increases under sintering in the specific temperature. However, the density and compression resistance are reduced at the same moment. In other hand, the crystal SiO2 in sewage sludge ash have negative influence on the bloating effect of aggregates. This is because sufficient Amorphous SiO2 material is needed to trap gaseous bubbles in order to enhance bloating effect. Additionally, except the phrase change of SiO2, there are several factors affecting the bloating effect of aggregates. The factors include sintering temperature, the content of crystal and amorphous phase material, and the flux. We could also reduce the sintering temperature or diminish the bloating effect of aggregates by adding crystal and glass, incinerated ash or etc to adjust the composition of the sewage sludge ash. However, sintering temperature is still the most crucial factor for controlling the bloating effect. After the evaluation of the efficiency of turbidity removal, as for non-broken-sintered-filter by sintering time in 10min. and sintering temperature at 1,125℃, the filtration performance equal to the sand filled in the 10cm filter bed nearly. The optimum substitution ratio to sand was 25%. Sintered under the same conditions but crumbled artificially later, broken-sintered-filter improved the decreasing efficiency of turbidity removal into upwards, extending the filter run.In conclusion, the sintered filter reveals its potential to substitute the sand as the filter media of the deep bed filtration according to the properly physical and chemical characteristics, and the competence of turbidity removal. |
