摘要：纤维素酶是纤维素水解酶的总称，可以将木质纤维素水解成还原性糖，在生物质能源的利用中起着至关重要的作用。纤维素酶发酵液目前的澄清工艺主要有板框过滤、絮凝、离心分离等，这些传统的工艺存在效率低、产品纯度不高等问题。膜分离技术是新兴的一种分离技术，以低能耗、环境友好等众多优点在生物质分离方面备受青睐。膜污染在膜应用方面的瓶颈问题，本文以“系列阻力模型”为基础，考察了在过滤过程中操作条件对膜各部分的污染阻力的影响，研究了被纤维素酶发酵液污染后凹土微滤膜的清洗再生方法。结果表明：可逆污染阻力 ( Rrev ) 在总阻力中所占的比例相比较不可逆阻力 ( Rirr ) 在总阻力中所占的比例来说大很多。对于被纤维素酶发酵液污染后的凹土微滤膜，在低压高速下，经过水冲洗和化学清洗后，通量可恢复至初始通量的90%。79938

毕业论文关键词：纤维素酶发酵液，膜分离技术，膜污染，化学清洗

Abstract：Cellulase is a general term for cellulolytic enzymes, which can degrade cellulose into reducing sugar, and play a vital role in the utilization of biomass energy。 Nowadays, traditional clarification methods for cellulase fermentation broth include filtration plate, flocculation, centrifugation and so on。 Their intrinsic disadvantages are low efficiency and low product quality。 Membrane separation as a new separation technology has received great attention due to its low energy consumption and environment friendly。 In this work, a type of new attapulgite ceramic membranes were prepared and used in cellulase fermentation broth sterilization process。Membrane fouling is a bottleneck problem in the membrane proces。 Based on resistance-in-series model, the influence of operating condition on resistance and different cleaning methods were investigated。 The results show that the dominant component of the total resistance ( Rt ) was the reversible fouling resistance ( Rrev ), whereas the irreversible fouling resistance ( Rirr ) was less important。 Under low trans-membrane pressure and high velocity, the fouled attapulgite membrane could be satisfactorily regenerated。 The pure water flux can recover to 90% of the fresh membrane through water rinsing and chemical cleaning。

Keywords：Cellulase fermentation broth, Membrane separation, Membrane fouling, Chemical cleaning

目录

1 引言 2

1。1 发酵液 2

1。1。1 发酵液的简介 2

1。1。2 发酵液处理的目的和要求 2

1。1。3 发酵液的处理方法 2

1。2 膜分离 2

1。3 膜污染 2

1。3。1 膜污染的产生 2

1。3。2 膜污染的影响因素 2

1。4 膜清洗 2

1。4。1 膜清洗的分类 2

1。4。2 膜清洗的原理 2

1。5 本文研究思路和内容 2

2 实验部分 2

2。1 实验原料 2

2。2 实验装置 2

2。3 阻力分析方法 2

2。4 污染膜清洗方法 2

3 结果与讨论 2

3。1影响阻力的因素