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揭示了分层细胞外聚合物质在基于膜的微藻收获中的作用:热力学和计算见解
Wenxin Song1, Jiaying Ma1, Shiyong Miao1
1State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
Water research
|January 5, 2025
概括
微藻收获中的可溶性细胞外聚合物 (EPS) 减少了膜污染,而结合的EPS则增加了它. 这项研究模拟了污染,以提高废水处理中的膜分离效率.
科学领域:
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
- 生物技术是生物技术.
背景情况:
- 膜分离对于废水处理中的微藻收获是节能的.
- 藻类细胞和细胞外聚合物物质 (EPS) 的膜污染阻碍了工业应用.
- 了解分层EPS对于减轻污染至关重要.
研究的目的:
- 研究藻类衍生污染物堆积在被分层EPS影响的膜表面上的微过程.
- 用计算方法模拟藻类细胞沉积和蛋糕层的形成.
- 分析溶性EPS (S-EPS) 和结合的EPS (B-EPS) 在膜污染中的作用.
主要方法:
- 使用半合计算流体动力学 (CFD) -离散元件方法 (DEM) 模拟.
- 使用球平面/球球模型研究了热力学相互作用.
- 通过观察自身值'n'的变化与EPS分层分析了膜孔堵塞.
主要成果:
- 由于其水友性质和网络结构,S-EPS减少了藻类膜粘附,并促进了"动态膜"效应,增强了保留力.
- 蛋白质含量较高的B-EPS显示出更大的污染潜力和藻类细胞粘附.
- CFD-DEM模拟提供了定量沉积分析,空间分辨率和污染物的力分析.
结论:
- 分层EPS在微藻收获期间显著影响膜污垢.
- 区分EPS类型 (S-EPS与B-EPS) 是优化膜性能的关键.
- 基于粒子应力逆转沉积的新方法被建议用于未来的模拟.
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