Journal
BIORESOURCE TECHNOLOGY
Volume 197, Issue -, Pages 429-433Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.08.096
Keywords
Forward osmosis; Microalgae; Membrane fouling; Extracellular polymeric substances (EPS)
Funding
- JSPS [24760428]
- Steel Foundation for Environmental Protection Technology
- Public Foundation of Chubu Science and Technology Center
- Center of Innovation Program by Japan Science and Technology Agency (JST)
- Grants-in-Aid for Scientific Research [24760428] Funding Source: KAKEN
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Application of forward osmosis (FO) membrane to microalgae cultivation processes enables concentration of microalgae and nutrients with low energy consumption. To understand fouling characteristics of FO membrane in concentration of microalgae culture, we studied flux decline, flux recovery by cleaning, and foulants characteristics, in different membrane orientation of active-layer-facing-feed-solution (AL-FS) and active-layer-facing-draw-solution (AL-DS) modes. Batch concentration of Chlorella vulgaris was conducted with a cellulose-triacetate FO membrane. Rapid flux decline and lower flux recovery was observed in AL-DS mode because of inner-membrane fouling including internal pore clogging, adsorption and internal concentration polarization in the support layer. A proportion of polysaccharides in extracellular polymeric substances to soluble microbial products were larger in chemical cleaning effluent than physical one in AL-DS mode, although those were not significantly different in AL-FS mode. Excitation-emission matrix analysis revealed that proteins and humic-like substances were also possible irreversible foulants both in AL-DS and AL-FS modes. (C) 2015 Elsevier Ltd. All rights reserved.
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