不同進料組成對沉浸式薄膜過濾系統性能之研究

本研究是探討在不同的操作參數下沉浸式薄膜過濾系統其過濾系統之表現。其中操作參數包括溶質種類、濃度和組成，薄膜模組之傾斜角，薄膜種類，曝氣量，透膜壓差，與間歇式操作的運用。在固定壓差法下，利用實驗中各參數的變化來獲得濾速對時間的變化。實驗結果顯示：各實驗系統在曝氣為零的情況下濾速衰退的情況非常快且容易達到與壓差無關的臨界濾速，而曝氣不為零的情況下，在溶質為Dextran T500的系統中，在100k MWCO薄膜中少量曝氣即可以達到與大量曝氣同樣減緩濾速快速衰退的情形，而在500k MWCO 薄膜中不同的曝氣量有著較顯著的不同之濾速提升情形。溶質為PMMA顆粒的系統下，在100k MWCO薄膜中曝氣量的多寡對濾速影響並不明顯且其濾速值與純水濾速相近，而在500k MWCO薄膜中濾速有著比在Dextran T500溶質系統中曝氣有著更明顯的影響。在Dextran T500與PMMA顆粒混合溶液中，溶質比例的不論如何變化，即使在提升大顆粒的附著性系統中(PMMA顆粒濃度高達7.5 kg/m3)，其濾速行為仍然與只有Dextran T500溶質系統的濾速行為相近。薄膜傾斜角度的變化(900-1600) 對於在500k MWCO 薄膜下PMMA溶質系統中濾速的改善非常顯著，而在Dextran T500溶質系統中，在1600下少量曝氣即具有在900下大量曝氣同樣的效果。

關鍵字

沉浸式薄膜；傾斜；通氣；濃度極化

並列摘要

In the study, the performance of the submerged membrane filtration system was investigated in different experimental parameter. and fixed trans-membrane pressure difference method was used. The operated condition in the study included the concentration and composition of the solute, the inclination angle of the membrane module, the rejection rate (MWCO) of membrane, aeration rate, and trans-membrane pressure difference. In the system of no aeration, the flux inclination was very serious and reached the critical flux easily. In the filtration system of Dextran T500, the effect of little aeration rate is equal to the membrane performance of large aeration rate in 100k MWCO membrane, and the different aeration rates had more obvious different effects in 500k MWCO membrane than in 100k MWCO. Dextran T500 was also measured in different aeration rates and inclination angles. The aeration had more effect in the filtration system of PMMA powders than in that of Dextran T500.In the double solute system, Dextran T500 played a major role in the flux behavior of the filtration system even if the concentration of T500 was a quite low concentration. The concentration boundary layer thicknesses calculated by concentration polarization model and boundary layer model were discussed in the study.

並列關鍵字

Submerged Membrane ； Inclination ； Aeration ； Concentration Polarization

參考文獻

Cheryan, M. (1998). Ultrafiltration and Microfiltration Handbook. Pennslvania: Technomic Inc.

Côté, P., Buisson, H., Pound, C., & Arakaki, G. (1997). Immersed membrane activated sludge for the reuse of municipal wastewater. Desalination, 113(2-3), 189-196.

Defrance, L., & JaffrinMember of Institut Universitaire de France.,M.Y. (1999). Comparison between filtrations at fixed transmembrane pressure and fixed permeate flux: application to a membrane bioreactor used for wastewater treatment. Journal of Membrane Science, 152(2), 203-210.

Fane, A. G., & Cho, B. D. (2002). Fouling transients in nominally sub-critical flux operation of a membrane bioreactor. Journal of Membrane Science, 209(2), 391-403.

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不同進料組成對沉浸式薄膜過濾系統性能之研究

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