碩士 / 嘉南藥理科技大學 / 環境工程與科學系碩士班 / 95 / In this study, a pilot scale of submerged aerobic membrane bioreactor (SAMBR) system was installed for the treatment of pharmaceutical wastewater. The purposes of this study were to evaluate the treatment efficiency of pharmaceutical wastewater by SAMBR and the fouling phenomena of membrane was observed.
In this study, no sludge was withdrawn for 76 days during the initial period of operation. After day 77, sludge retention time (SRT) was set at 331 days and the average hydraulic retention time (HRT) is 51 hours. The results showed that a steady state of bio-system was obtained on day 25 after the sludge feeding. In the initial 76 days, the MLSS level of biological and membrane tanks was in the range of 5.7~9.1 g/L and 6.2~10.0 g/L, respectively. The MLVSS levels in the range of 5.2~8.1 g/L and 5.4~8.6 g/L were obtained for both of tanks. The MLVSS/MLSS ratios were also calculated both in the biological and membrane tanks. In the case of biological reactor, the MLVSS/MLSS ratio which in the range of 0.84~0.95 was obtained and 0.81~0.92 for membrane tank. The system was stable again on day 17 after sludge was withdrawn, at this sludge-withdraw stage, the MLSS level of biological tank was in the range of 5.7~9.1 g/L and 13.3~16.7 g/L for membrane tank.
BOD effluent was remarkably stable and with a highest removal efficiency of 99.3%. COD and SS removal was 95.9% and 100.0%, respectively. The results showed that the BOD volumetric loading of biological tank was in the range of 0.068~4.617 kg BOD5/m3 day and 0.007~0.04 kg BOD5/m3 day for membrane tank. The BOD F/M ratio of biological tank was in the range of 0.07~0.36 kg BOD5/kg MLVSS-day and 0.0005~0.0071 kg BOD5/kg MLVSS-day for membrane tank. COD volumetric loading of biological tank was in the range of 0.099~6.844 kg COD/m3 day and 0.011~0.408 kg COD/m3 day for membrane tank. COD F/M ratio of biological tank was in the range of 0.014~0.65 kg COD/ kg MLVSS-day and 0.003~0.079 kg COD/kg MLVSS-day for membrane tank. The results of specific oxygen uptake rate (SOUR) showed that the SOUR value of biological tank was in the range of 19~75 mg-O2/g MLVSS-hr and 30~81 mg-O2/g MLVSS-hr for membrane tank. The levels of silt density index (SDI) for all effluents were lower than 6.3 indicated the high quality of discharge.
Membrane modules were withdrawn for clogging removal on day 22 and day 96. Chemical cleaning was carried out on day 102 by inside-out type washing. The results of scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS) demonstrated that the fouling of membrane outer surface was mainly due to microorganisms. The series fouling membrane showed that foulants of cation ions with high diversity species were observed on the outer surface and less cation ions were detected on the inner surface of membrane. However, the opposite results of cation distributions were obtained for the light fouling membrane. The results of SEM and EDS revealed that there were two mechanisms of membrane fouling in this study, cations accumulation by microorganisms on the outer surface or the deposition of cations on the inner surface of membrane, resulted in the different transmembrane pressure and flux for different membrane modules.
This SAMBR pilot plant was monitored for 114 days. Water sampling and measurement were carried out for system function evaluation on day 219. The results showed that the application of submerged aerobic membrane bioreactor for the treatment of pharmaceutical wastewater is feasible and successful.
| Identifer | oai:union.ndltd.org:TW/095CNUP5515002 |
| Date | January 2006 |
| Creators | Liang-I Kan, 甘良義 |
| Contributors | Shiow-Shyung Lin, 林秀雄 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 220 |
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