Journal
CHEMOSPHERE
Volume 285, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131483
Keywords
Alginate recovery; Forward osmosis; Dewatering; Draw solute; Reverse solute diffusion; Calcium chloride
Categories
Funding
- Beijing Outstanding Tal-ents Training Project
- Fundamental Research Funds for Beijing Univer-sity of Civil Engineering and Architecture [X20097, X20133]
- Beijing High-level Innovation Team Research of key technologies on tradi-tional village protection and residential building function improve-ment,
- Beijing Advanced Innovation Center for Future Urban Design
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In this study, it was found that using calcium ions for RSF in FO can effectively recover Ca-Alg as a recycled material. Water flux in FO significantly increased with the increase in calcium chloride concentration, while the concentration of SA had little influence on water flux in FO.
The water content in the recycled alginate solutions from aerobic granular sludge was nearly 100%. Forward osmosis (FO) has become an innovative dewatering technology. In this study, the FO concentration of sodium alginate (SA) was investigated using calcium chloride as a draw solute. The reverse solute flux (RSF) of calcium ions in FO had a beneficial effect, contrary to the findings of previous literature. The properties of the concentrated substances formed on the FO membrane on the feed side were analyzed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, verifying that calcium alginate (Ca-Alg), which can be used as a recycled material, was formed on the FO membrane on the feed side owing to the interaction between SA and permeable calcium ions. Water flux increased significantly with the increase in calcium chloride concentration, while the concentration of SA had little influence on the water flux in FO. Based on this discovery, we propose a novel method for the concentration and recovery of alginate, in which the RSF of calcium ions is utilized for recovering Ca-Alg by FO, with calcium chloride as a draw solute.
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