Effect of moisture on pretreatment efficiency for anaerobic digestion of lignocellulosic substrates

Peces, M., Astals, S. and Mata-Alvarez, J. (2015) Effect of moisture on pretreatment efficiency for anaerobic digestion of lignocellulosic substrates. Waste Management, 46 189-196. doi:10.1016/j.wasman.2015.08.022


Author Peces, M.
Astals, S.
Mata-Alvarez, J.
Title Effect of moisture on pretreatment efficiency for anaerobic digestion of lignocellulosic substrates
Journal name Waste Management   Check publisher's open access policy
ISSN 1879-2456
0956-053X
Publication date 2015-08-24
Sub-type Article (original research)
DOI 10.1016/j.wasman.2015.08.022
Open Access Status Not Open Access
Volume 46
Start page 189
End page 196
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2016
Language eng
Formatted abstract
The present study evaluates the effect of moisture in low-temperature and ultrasound pretreatment on lignocellulosic substrates anaerobic biodegradability, where brewer’s spent grain was used as model substrate. Besides moisture content, low-temperature pretreatment was also evaluated in terms of temperature (60–80 °C) and exposure time (12–72 h). Likewise, ultrasonication was also evaluated in terms of specific energy (1000–50,000 kJ kgTS−1). In addition, the effect of substrate particle size reduction by milling pretreatment was also considered. The results clearly demonstrated that substrate moisture (total solid concentration) is a significant parameter for pretreatment performance, although it has been rarely considered in pretreatment optimisation. Specifically, moisture optimisation increased the methane yield of brewer’s spent grain by 6% for low-temperature pretreatment (60 °C), and by 14% for ultrasound pretreatment (1000 kJ kgTS−1) towards the control (without pretreatment). In both pretreatments, the experimental optimum total solid concentration was 100 gTS kg−1. Thus, lowering substrate moisture, a strategy suggested attaining energetic pretreatment feasibility, needs to be analysed as another pretreatment variable since it might have limited correlation. Finally, a preliminary energetic balance of the pretreatments under study showed that the extra methane production could not cover the energetic pretreatment expenses.
Keyword Anaerobic digestion
Energy crops
Pre-treatment
Thermal
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2016 Collection
Advanced Water Management Centre Publications
 
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