Abstract
本研究主要在探討以生物滴濾床法處理含揮發性有機物質(VOCs)之成 效；研究中將以甲苯作為待處理物質，使用之生物滴濾床主體全長 120 公分，是由四段內徑 8 公分，高 30 公分之壓克力圓管製成，內部填充 矽藻土，填充高度為 100 公分。氣相中之甲苯及氧氣濃度分別藉由 GC-14A/FID 和攜帶式酵素濃度計加以分析，而生物膜厚度可經由稱重法 測得。由實驗分析可求得不同之甲苯進氣濃度及表面氣體流速下，甲苯、 氧氣濃度及生物膜厚度隨床高度的變化。 同時，本研究也綜合考慮質 傳效應、生物分解、床內之生物分佈及氣體流動行為，建立一套完整的動 力模式，藉以描述生物滴濾床內之各項動力行為，並預估不同進氣條件下 ，滴濾床對甲苯的去除效率。而研究結果亦顯示出本研究所提出之動力模 式，對於生物滴濾床內甲苯、氧氣濃度及生物膜厚度之分佈情況，能做一 有效而良好的預測。 The applicability of trickle-bed bioreactor process to the treatment of waste gas streams containing VOCs will be studied. Toluene will be used as the target pollutant. The experiments will be conducted in a laboratory-scale trickle-bed bioreactor with an inner diameter of 8 cm, an overall height of 120 cm and a packed height of 100 cm of diatomaceous earth. The concentrations of toluene will be measured by GC-14A/FID, respectively. The biofilm thickness will be determined by the dry weight method. Effect of the inlet toluene concentration on the profiles of toluene and O2 concentrations and the biofilm thickness along the trickle-bed bioreactor will be obtained experimentally.In addition, a comprehensive kinetic model which takes into account mass transfer, biodegradation, biomass distribution and the flow pattern of the bulk gas phase will be developed to apply toward the design of the trickle-bed bioreactor as well as the improvement of the trickle-bed bioreactor performance for the treatment of waste gases containing toluene. Furthermore, we will try to find a new method to reduce the clogging of the bed and extend the operation time of the trickle-bed bioreactor.