Aghajani Mehdi, Rahimpour Ahmad, Amani Hossein, Taherzadeh Mohammad J
Department of Chemical Engineering Babol Noushirvani University of Technology Babol Iran.
Swedish Centre for Resource Recovery University of Boras Boras Sweden.
Eng Life Sci. 2018 Feb 5;18(5):272-280. doi: 10.1002/elsc.201700070. eCollection 2018 May.
In this work, rhamnolipid biosurfactant as an eco-friendly and biodegradable cleaning agent was produced by bacteria and was used to evaluate the chemical cleaning efficiency of whey fouled ultrafiltration membranes. Thin layer chromatography (TLC) and Fourier transform infrared spectroscopy (FTIR) confirmed the successful synthesis of rhamnolipid. The produced rhamnolipid was compared to chemical cleaners including sodium hydroxide (NaOH), sodium dodecyl sulfate (SDS) and Tween 20. Ultrafiltration membranes used for fouling and cleaning analysis were prepared using phase inversion via immersion precipitation technique. For studying the fouling mechanisms, Hermia's model adapted to cross-flow was used. From the fouling mechanism experiments, it was found that the complete blocking and cake formation were the dominant fouling mechanisms. The highest values of cleaning efficiency were achieved using rhamnolipid and NaOH as cleaning agents with the flux recovery of 100%, but with considering the low concentration of the rhamnolipid used in the cleaning solution compared to NaOH (0.3 versus 4 g/L for NaOH), its application is preferred.
在这项工作中，由细菌生产的鼠李糖脂生物表面活性剂作为一种环保且可生物降解的清洁剂，被用于评估乳清污染超滤膜的化学清洗效率。薄层色谱法（TLC）和傅里叶变换红外光谱法（FTIR）证实了鼠李糖脂的成功合成。将所生产的鼠李糖脂与包括氢氧化钠（NaOH）、十二烷基硫酸钠（SDS）和吐温20在内的化学清洁剂进行了比较。用于污染和清洗分析的超滤膜是通过浸没沉淀相转化技术制备的。为了研究污染机制，使用了适用于错流的赫米亚模型。从污染机制实验中发现，完全堵塞和滤饼形成是主要的污染机制。使用鼠李糖脂和NaOH作为清洁剂时，清洗效率最高，通量恢复率为100%，但考虑到清洗溶液中使用的鼠李糖脂浓度与NaOH相比很低（NaOH为4 g/L，鼠李糖脂为0.3 g/L），因此更倾向于应用鼠李糖脂。
