| 摘要: | 本研究嘗試建構一套，實驗室級規格之循序批分式薄膜生物反應槽（SBMBR），以處理化糞池出流水。實驗於固定污泥停留時間為20天及水力停留時間為6小時等條件下進行，藉以研究薄膜阻塞程度、SBMBR反應槽中微生物濃度之變化、與系統操作條件下出流水之水質變化等情形。
本研究分三個階段進行，反應槽之有效體積為12L。第一與第二階段為好氧薄膜生物反應槽之馴養期與穩定期，槽中污泥濃度約為4000 mg/L，薄膜抽停時間為每抽5分鐘停1分鐘，第三階段則為循序批分式薄膜生物反應槽（SBMBR），操作程序分別為進水15分鐘、曝氣90分鐘、攪拌90分鐘、靜置105分鐘、出流60分鐘，污泥濃度約為3510 mg/L。藉此三階段操作程序之進行，以瞭解化糞池出流水中污染物降解指標變化之情形，並評估本實驗室薄膜生物反應系統之處理成效。結果顯示，第一與第二階段SS、濁度、真色色度平均最佳去除率分別為95.72%、97.35%與36.69%。而於第三階段SS、濁度、真色色度平均最佳去除率則為91.41%、91.51%與40.18%。
研究中並於0 g/L、0.125 g/L、0.5 g/L、0.75 g/L、1.5 g/L、3 g/L不同粉狀活性碳濃度之添加下，利用修正積垢指數（MFI）設備，進行MBR槽中污泥阻塞程度之研究。
結果顯示，PAC最佳添加劑量為0.75 g/L，於第一與第二階段未添加時，MFI值最高達0.9798，添加後MFI值降低至0.0052，而第三階段未添加PAC時，MFI值最高達0.1769，添加後MFI值則降低至0.0038，此顯示添加粉狀活性碳可降低薄膜快速阻塞之情形。
This study aimed at the effluent sewage treatment of septic tank by a laboratory-scale sequential batch reactor biological membrane fractions (SBMBR), focus to explore the film blocking degree various of SBMBR, microbial concentration various in SBMBR system, and water quality changes in system outflow process. The SRT and HRT of this study were controlled at 20 days and 6 hrs.
Three phase experiments had conducted in this study. The effective volume of MBR reactor was 12L. Phase I and phase II were domestication period and stable period. The sludge concentration in MBR reactor were controlled around 4000 mg L-1 and that 1 min pumping stop time had inserted in each 5 min reaction time for film of MBR. The conditions in phase III (which namely sequential batch reactor biological membrane fractions (SBMBR)) had fixed water inflow time, aeration time, stirring time, standing time, water outflow time, sludge concentration at 15 min, 90 min, 90 min, 105 min, 60 min and 3510 mg L-1, respectively. The system was purpose a to collect the contaminant degrade index of effluent sewage in septic tank and evaluate the treatment efficiency to this SBMBR system for our laboratory. The result showed that average optimal removal efficiencies of suspension solid (SS), turbidity, true-color in phase I and II stages ware 95.72%, 97.35% and 36.69 %, respectively. However 91.41%, 91.51 % and 40.18% had attained in phase III stage.
In addition, the modified fouling index (Modified Fouling Index, MFI) instrument had used in this study to realize the sludge blocking condition in MBR tank. Powder activated carbon (PAC) concentration of 0 g L-1, 0.125 g L-1, 0.5 g L-1, 0.75 g L-1, 1.5 g L-1and 3 g L-1 were conducted to this study. Result showed that the optimal dosage of PAC in MFI test was 0.75 g L-1. While PAC had non-existed in phase I and II stages, the MFI value could higher to 0.9798, but decrease to 0.0052 after PAC had added. Simultaneously, 0.1769 and 0.0038 MFI values in phase III could attained at PAC added before and after experiment proceed. This result indicated that PAC could decrease rapid blocking of the film in MBR system. |
