Enhancing anaerobic biogasification of corn stover through wet state NaOH pretreatment.
A new method of wet state (WS) sodium hydroxide (NaOH) was advanced to pretreat corn stover for enhancing biogas production. The results showed that 88% moisture content, 3-day treatment time and ambient temperature (20 degrees C) was appropriate for WS NaOH pretreatment. The NaOH dose of 2% and the loading rate of 65 g/L were found to be optimal in terms of 72.9% more total biogas production, 73.4% more methane yield, and 34.6% shorter technical digestion time, as compared to the untreated one. WS pretreatment used 86% shorter treatment time and 66.7% less NaOH dose than solid state one. The analyses of chemical compositions and chemical structures showed that 9.3-19.1% reduction of the contents of total Lignin, cellulose, and hemicellulose (LCH), and 27.1-77.1% increase of hot-water extractives contributed to the enhancement of biogas production. WS NaOH pretreatment could be one of cost-effective methods for high efficient biological conversion of corn stover into bioenergy.
Zheng
Mingxia
M
Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
Li
Xiujin
X
Li
Laiqing
L
Yang
Xiaojin
X
He
Yanfeng
Y
D000693:Anaerobiosis / Q000187:drug effects; D001674:Bioelectric Energy Sources; D005740:Gases / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000378:metabolism; D012972:Sodium Hydroxide / Q000494:pharmacology*; D013997:Time Factors; D014835:Volatilization / Q000187:drug effects; D014867:Water / Q000378:metabolism*; D003313:Zea mays / Q000187:drug effects* / Q000378:metabolism*
D005740:Gases; D014867:Water; D012972:Sodium Hydroxide; D008697:Methane