Valorization of sorghum distillery residue to produce bioethanol for pollution mitigation and circular economy.

Chen, W-H; Lo, H-J; Yu, K-L; Ong, H-C; Sheen, H-K

Valorization of sorghum distillery residue to produce bioethanol for pollution mitigation and circular economy.

Chen, W-H Lo, H-J Yu, K-L Ong, H-C Sheen, H-K

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Environmental Pollution, 2021, 285, pp. 1-12
Issue Date:: 2021-09-15

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Field	Value	Language
dc.contributor.author	Chen, W-H
dc.contributor.author	Lo, H-J
dc.contributor.author	Yu, K-L
dc.contributor.author	Ong, H-C
dc.contributor.author	Sheen, H-K
dc.date.accessioned	2022-05-17T03:45:56Z
dc.date.available	2021-04-17
dc.date.available	2022-05-17T03:45:56Z
dc.date.issued	2021-09-15
dc.identifier.citation	Environmental Pollution, 2021, 285, pp. 1-12
dc.identifier.issn	0269-7491
dc.identifier.issn	1873-6424
dc.identifier.uri	http://hdl.handle.net/10453/157455
dc.description.abstract	This research aims to study the wet torrefaction (WT) and saccharification of sorghum distillery residue (SDR) towards hydrochar and bioethanol production. The experiments are designed by Box-Behnken design from response surface methodology where the operating conditions include sulfuric acid concentration (0, 0.01, and 0.02 M), amyloglucosidase concentration (36, 51, and 66 IU), and saccharification time (120, 180, and 240 min). Compared to conventional dry torrefaction, the hydrochar yield is between 13.24 and 14.73%, which is much lower than dry torrefaction biochar (yield >50%). The calorific value of the raw SDR is 17.15 MJ/kg, which is significantly enhanced to 22.36-23.37 MJ/kg after WT. When the sulfuric acid concentration increases from 0 to 0.02 M, the glucose concentration in the product increases from 5.59 g/L to 13.05 g/L. The prediction of analysis of variance suggests that the best combination to maximum glucose production is 0.02 M H2SO4, 66 IU enzyme concentration, and 120 min saccharification time, and the glucose concentration is 30.85 g/L. The maximum bioethanol concentration of 19.21 g/L is obtained, which is higher than those from wheat straw (18.1 g/L) and sweet sorghum residue (16.2 g/L). A large amount of SDR is generated in the kaoliang liquor production process, which may cause environmental problems if it is not appropriately treated. This study fulfills SDR valorization for hydrochar and bioenergy to lower environmental pollution and even achieve a circular economy.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Environmental Pollution
dc.relation.isbasedon	10.1016/j.envpol.2021.117196
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Edible Grain
dc.subject.mesh	Environmental Pollution
dc.subject.mesh	Sorghum
dc.subject.mesh	Triticum
dc.subject.mesh	Edible Grain
dc.subject.mesh	Environmental Pollution
dc.subject.mesh	Sorghum
dc.subject.mesh	Triticum
dc.subject.mesh	Sorghum
dc.subject.mesh	Triticum
dc.subject.mesh	Environmental Pollution
dc.subject.mesh	Edible Grain
dc.title	Valorization of sorghum distillery residue to produce bioethanol for pollution mitigation and circular economy.
dc.type	Journal Article
utslib.citation.volume	285
utslib.location.activity	England
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Information, Systems and Modelling
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-05-17T03:45:54Z
pubs.publication-status	Published
pubs.volume	285

Abstract:

This research aims to study the wet torrefaction (WT) and saccharification of sorghum distillery residue (SDR) towards hydrochar and bioethanol production. The experiments are designed by Box-Behnken design from response surface methodology where the operating conditions include sulfuric acid concentration (0, 0.01, and 0.02 M), amyloglucosidase concentration (36, 51, and 66 IU), and saccharification time (120, 180, and 240 min). Compared to conventional dry torrefaction, the hydrochar yield is between 13.24 and 14.73%, which is much lower than dry torrefaction biochar (yield >50%). The calorific value of the raw SDR is 17.15 MJ/kg, which is significantly enhanced to 22.36-23.37 MJ/kg after WT. When the sulfuric acid concentration increases from 0 to 0.02 M, the glucose concentration in the product increases from 5.59 g/L to 13.05 g/L. The prediction of analysis of variance suggests that the best combination to maximum glucose production is 0.02 M H2SO4, 66 IU enzyme concentration, and 120 min saccharification time, and the glucose concentration is 30.85 g/L. The maximum bioethanol concentration of 19.21 g/L is obtained, which is higher than those from wheat straw (18.1 g/L) and sweet sorghum residue (16.2 g/L). A large amount of SDR is generated in the kaoliang liquor production process, which may cause environmental problems if it is not appropriately treated. This study fulfills SDR valorization for hydrochar and bioenergy to lower environmental pollution and even achieve a circular economy.

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http://hdl.handle.net/10453/157455