Journal
SUSTAINABILITY
Volume 13, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/su13137202
Keywords
anaerobic digestion; biogas enhancement; biomass; chemical pretreatment; ultrasound disintegration; wheat straw
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This study demonstrates that using ultrasonic processing on wheat straw can improve methane yield, and optimal results can be achieved under certain conditions.
Biomass is an attractive energy source that can be used for production of heat, power, and transport fuels and when produced and used on a sustainable basis, can make a large contribution to reducing greenhouse gas emissions. Anaerobic digestion (AD) is a suitable technology for reducing organic matter and generating bioenergy in the form of biogas. This study investigated the factors allowing the optimization of the process of biogas production from the digestion of wheat straw (WS). The statistical analysis of the experiments carried out showed that ultrasonic processing plays a fundamental role with the sonication density and solids concentration leading to improved characteristics of WS, reducing particle size, and increasing concentration of soluble chemical oxygen demand. The higher the sonicating power used, the more the waste particles are disrupted. The optimality obtained under mesophilic conditions for WS pretreated with 4% w/w (weight by weight) H2O2 at temperature 36 degrees C under 10 min of ultrasonication at 24 kHz with a power of 200 W improves the methane yield by 64%.
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