Tag Archives: membrane separation.

1099–1106 A.R.P.P. Weerasuriya Arachchige, L. Mezule and T. Juhna
Separation of reducing sugars from lignocellulosic hydrolysate: Membrane experiments & system dynamic modelling
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Separation of reducing sugars from lignocellulosic hydrolysate: Membrane experiments & system dynamic modelling

A.R.P.P. Weerasuriya Arachchige*, L. Mezule and T. Juhna

Riga Technical University, Faculty of Civil Engineering, Department of Water Science and Technology, Paula Valdena street 1-204/205, LV-1048 Riga, Latvia
*Correspondence: antonrayan@hotmail.com

Abstract:

Separation of fermentable sugars after hydrolysis of lignocellulosic biomass plays a vital role in second-generation biofuel production. Byproducts and solid fractions generated during pretreatment and hydrolysis can have adverse effects on fermentation efficiency. Previous studies have shown that a maximum of 40% (w/w) of sugar yield can be obtained by sequential UF and NF permeate recovery. This study aimed to introduce a multi-step membrane filtration process to recover fermentable sugars while removing inhibitory bi-products. Fermentable sugar recovery was investigated using a recirculation flow between various stages of separation. The experimental results demonstrated that by introducing NF permeate recirculation to the UF unit a sequential UF/NF system can achieve 60% (w/w%) recovery of reducing sugars. Based on the experimental results, a ‘Simultaneous ultrafiltration and nanofiltration model’ was developed using system dynamics. The model was used to predict the final sugar concentration and sugar yield using sugar permeability in each membrane as the dynamic variability. The model predicts that high sugar permeability (or selective permeability) through the ultrafiltration mostly affects the efficiency of the system, which still is a challenge.

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287-293 B. Dalecka, M. Strods and L. Mezule
Production of fermentation feedstock from lignocellulosic biomass: applications of membrane separation
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Production of fermentation feedstock from lignocellulosic biomass: applications of membrane separation

B. Dalecka*, M. Strods and L. Mezule

Riga Technical University, Faculty of Civil Engineering, Department of Water Science and Technology, Azenes 16/20-263, LV1048 Riga, Latvia; *Correspondence: brigita.dalecka@gmail.com

Abstract:

The development of cost-efficient, highly productive technologies for fermentation feed production from lignocellulose biomass is still a challenge. In this paper, the production of fermentable sugars from lignocellulosic biomass using hydrolysis techniques with membrane separation systems is studied. The research was conducted on both a laboratory and pilot level to evaluate and optimize the efficiency of the proposed technology. The results demonstrated that UF and NF permeate recovery increased efficiency, and the highest sugar recovery rates were obtained when secondary waste recirculation was introduced after NF and UF, reaching an almost 40% yield from all produced sugars.

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