Evaluation of the wastewater generated during alkaline pretreatment of biomass for feasibility of recycling and reusing

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Title
Evaluation of the wastewater generated during alkaline pretreatment of biomass for feasibility of recycling and reusing
Author(s)
Seonghun Kim; S D Kim; S Y Sohn
Bibliographic Citation
Renewable Energy, vol. 155, pp. 1156-1164
Publication Year
2020
Abstract
We evaluated the wastewater generated in the alkali pretreatment process of Miscanthus sacchariflorus with sodium hydroxide for the feasibility of recycling and reusing. After thermal alkali pretreatment of the biomass, the separated alkaline solution and the biomass wash water were filtrated using several different types of membranes to recover sodium hydroxide, as well as to eliminate lignin-hemicellulose fractions from the wastewater. Ion concentration, total organic carbon, and acid-hydrolyzed carbohydrate contents were analyzed to evaluate the quality of the alkaline wastewater. The data indicated that a poly(ether)sulfone-based ultrafiltration (UF) membrane filter with a low molecular weight cut-off was able to recover > 98% sodium ions and to remove > 60% of solubilized organic carbon fractions from the alkaline wastewater. These results indicated that filtration using UF membrane could be an alternative strategy to reuse wastewater and to recover the alkali catalyst in the alkali pretreatment process.
Keyword
MiscanthusPolyethersulfone-based ultrafiltration membraneAlkali pretreatmentAlkaline wastewaterBioethanolMembrane filtration
ISSN
0960-1481
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.renene.2020.04.018
Type
Article
Appears in Collections:
Jeonbuk Branch Institute > Microbial Biotechnology Research Center > 1. Journal Articles
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