4.7 Article

Microalgal exopolymeric substances fouling in submerged vacuum membrane distillation and its mitigation via enhanced air bubbling

期刊

DESALINATION
卷 508, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.desal.2021.115047

关键词

Organic fouling; Exopolymeric substances; Microalgae; Membrane distillation; Bubbling

资金

  1. Long Term Research Grant Scheme (LRGS) - Ministry of Higher Education, Malaysia [203PJKIMIA67215002]

向作者/读者索取更多资源

This study investigated the fouling behavior of submerged vacuum membrane distillation (S-VMD) in desalinating algal-blooming seawater, identifying inorganic salt precipitation and EPS as the main fouling agents. Protein fouling was found to dominate in the long run S-VMD operation, leading to increased hydrophobic interaction with the membrane surface. The system with air bubbling showed superior and stable flux performance with lower fouling compared to the non-bubbling S-VMD system.
This work aims at studying the fouling behaviour of submerged vacuum membrane distillation (S-VMD) in desalinating the algal-blooming seawater. A dynamic microalgal fouling phenomenon and its mitigation via air bubbling was investigated over the time. At the early stage of S-VMD operation, the precipitation of inorganic salts on the membrane surface was responsible for initiating the flux decline. In the later stage, significant amounts of EPS surrounding the microalgae cell aggregates were precipitated on the inorganic scalants and further increased the membrane fouling rate. Based on the exopolymeric substances (EPS) extraction analysis, hydrophilic polysaccharides as a result of the aggregation of microalgal cells was firstly observed, followed by dominating protein fouling over the long run S-VMD operation. Excreted proteins increased the hydrophobicity of the EPS by reducing the surface charge, thus leading to a strong hydrophobic interaction with membrane surface at the 60 h of S-VMD operation. Compared to the non-bubbling S-VMD system, the system subjected to 0.167 m/s air bubbling showed superior and stable flux performance with lower extent of fouling.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据