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Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration

Prehydrolysate, a dilute solution consisting mainly of pentoses, hexoses, and lesser quantities of organic acids, furfural and phenolics, is generated in the Kraft dissolving pulp process. An obstacle facing the valorization of the solution in hemicellulose biorefineries, by conversion of the sugars...

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Autores principales: Ajao, Olumoye, Rahni, Mohamed, Marinova, Mariya, Chadjaa, Hassan, Savadogo, Oumarou
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5746827/
https://www.ncbi.nlm.nih.gov/pubmed/29244761
http://dx.doi.org/10.3390/membranes7040068
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author Ajao, Olumoye
Rahni, Mohamed
Marinova, Mariya
Chadjaa, Hassan
Savadogo, Oumarou
author_facet Ajao, Olumoye
Rahni, Mohamed
Marinova, Mariya
Chadjaa, Hassan
Savadogo, Oumarou
author_sort Ajao, Olumoye
collection PubMed
description Prehydrolysate, a dilute solution consisting mainly of pentoses, hexoses, and lesser quantities of organic acids, furfural and phenolics, is generated in the Kraft dissolving pulp process. An obstacle facing the valorization of the solution in hemicellulose biorefineries, by conversion of the sugars into bioproducts such as furfural, is the low sugar concentration. Membrane filtration is typically proposed in several hemicellulose based biorefineries for concentrating the solution, although they are usually generated using different wood species, pretreatment methods, and operating conditions. However, the chemical composition of the solutions is generally not considered. Also, the combined effect of composition and operating conditions is rarely investigated for biorefinery applications. The purpose of this work was to determine the impact of the prehydrolysate composition and operating parameters on the component separation and permeate flux during membrane filtration. Using model prehydrolysate solutions, two commercial reverse osmosis (RO) membranes were screened, and one was selected for use, based on its higher sugar and acetic acid retention. A Taguchi L18 experimental design array was then applied to determine the dominant parameters and limiting factors. Results showed that the feed pressure and temperature have the highest impact on permeate flux, but the least effect on sugar retention. Further experiments to quantify flux decline, due to fouling and osmotic pressure, showed that furfural has the highest membrane fouling tendency, and can limit the lifetime of the membrane. Regeneration of the membrane by cleaning with a sodium hydroxide solution is also effective for reversing fouling. It has been demonstrated that RO can efficiently and sustainably concentrate wood prehydrolysate.
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spelling pubmed-57468272018-01-03 Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration Ajao, Olumoye Rahni, Mohamed Marinova, Mariya Chadjaa, Hassan Savadogo, Oumarou Membranes (Basel) Article Prehydrolysate, a dilute solution consisting mainly of pentoses, hexoses, and lesser quantities of organic acids, furfural and phenolics, is generated in the Kraft dissolving pulp process. An obstacle facing the valorization of the solution in hemicellulose biorefineries, by conversion of the sugars into bioproducts such as furfural, is the low sugar concentration. Membrane filtration is typically proposed in several hemicellulose based biorefineries for concentrating the solution, although they are usually generated using different wood species, pretreatment methods, and operating conditions. However, the chemical composition of the solutions is generally not considered. Also, the combined effect of composition and operating conditions is rarely investigated for biorefinery applications. The purpose of this work was to determine the impact of the prehydrolysate composition and operating parameters on the component separation and permeate flux during membrane filtration. Using model prehydrolysate solutions, two commercial reverse osmosis (RO) membranes were screened, and one was selected for use, based on its higher sugar and acetic acid retention. A Taguchi L18 experimental design array was then applied to determine the dominant parameters and limiting factors. Results showed that the feed pressure and temperature have the highest impact on permeate flux, but the least effect on sugar retention. Further experiments to quantify flux decline, due to fouling and osmotic pressure, showed that furfural has the highest membrane fouling tendency, and can limit the lifetime of the membrane. Regeneration of the membrane by cleaning with a sodium hydroxide solution is also effective for reversing fouling. It has been demonstrated that RO can efficiently and sustainably concentrate wood prehydrolysate. MDPI 2017-12-15 /pmc/articles/PMC5746827/ /pubmed/29244761 http://dx.doi.org/10.3390/membranes7040068 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ajao, Olumoye
Rahni, Mohamed
Marinova, Mariya
Chadjaa, Hassan
Savadogo, Oumarou
Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration
title Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration
title_full Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration
title_fullStr Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration
title_full_unstemmed Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration
title_short Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration
title_sort study of separation and fouling of reverse osmosis membranes during model hydrolysate solution filtration
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5746827/
https://www.ncbi.nlm.nih.gov/pubmed/29244761
http://dx.doi.org/10.3390/membranes7040068
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