混合薄膜與鹽析程序自醱酵處理液回收生物製品

Recovery of Bioproducts from Treated Fermentation Liquors by a Hybrid Membrane and Salting-Out Process

陳英仕(Ying-Shr Chen)

指導教授 ： 莊瑞鑫

元智大學/工程學院/化學工程與材料科學學系/碩士(2006年)

摘要

本論文利用混合薄膜超過濾與鹽析程序，自醱酵處理液中回收生物製品，為了提高生物製品的回收效率及純度，尋找薄膜過濾和鹽析之最佳操作條件。採用恆壓攪拌式及掃流式進行超過濾，來探討在不同操作條件之阻隔率之變化。在超過濾程序中，因受到濃度極化和結垢現象的影響，導致濾速衰減。為了提升濾速，利用清洗劑在掃流式系統中，反覆沖洗薄膜模組方式。
濾速理論分析方面，以過濾堵塞機制、阻力串聯模式與質量平衡理論，分析濾速行為，探討各阻力參數及操作條件之相關性，並模擬預測其變化。過濾阻塞機制主要是以濾餅過濾為主。在阻力串聯模式中，由結果顯示濃度極化阻力所佔比例為最大，濃度極化阻力及濾餅過濾阻力隨著透膜壓差增加而增加之趨勢，進而獲得其濾速理論數學式，理論之濾速值其結果與實驗結果相當吻合。

關鍵字

醱酵處理液 ； 超過濾 ； 濾速行為 ； 阻隔率 ； 阻力分析 ； 鹽析

並列摘要

This research utilizes a hybrid process of membrane ultrafiltration and salting-out effect, for the recovery of bioproducts from treated fermentation liquors. The best operating conditions for this purpose were determined. Ultrafiltration experiments were conducted in two types of process; that is dead-end and cross-flow modes, under various operating conditions to discuss the rejection (%). The ultrafiltration process is affected by concentration polarization and fouling phenomenon, resulting in a flux decline. In order to improve the flux, the membrane module was repeatedly washed in the cross-flow system.
The blocking filtration laws and resistance-in-series model, coupled with the mass balance theory, have been proposed to analyze the effects of operating parameters on the flux behavior and the resistances in the ultrafiltration of treated fermentation liquors. An equation was used to predict the permeate flux of ultrafiltration. The blocking filtration phenomena mainly rely on cake filtration. In the resistance-in-series model, the resistances caused by concentration polarization and cake filtration increase with increasing transmembrane pressure. It was shown that concentration polarization plays the most important role in the resistance of filtration. A theoretical equation was obtained for predicting permeate flux. The model prediction of the permeate flux agree well with the experimental data.

並列關鍵字

Treated Fermentation Liquors ； Ultrafiltration ； Flux Behavior ； Rejection ； Resistance Analysis ； Salting-Out

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