Asparagus stem as a new lignocellulosic biomass feedstock for anaerobic digestion: increasing hydrolysis rate, methane production and biodegradability by alkaline pretreatment.
Recently, anaerobic digestion of lignocellulosic biomass for methane production has attracted considerable attention. However, there is little information regarding methane production from asparagus stem, a typical lignocellulosic biomass, by anaerobic digestion. In this study, alkaline pretreatment of asparagus stem was investigated for its ability to increase hydrolysis rate and methane production and to improve biodegradability (BD). The hydrolysis rate increased with increasing NaOH dose, due to higher removal rates of lignin and hemicelluloses. However, the optimal NaOH dose was 6% (w/w) according to the specific methane production (SMP). Under this condition, the SMP and the technical digestion time of the NaOH-treated asparagus stem were 242.3 mL/g VS and 18 days, which were 38.4% higher and 51.4% shorter than those of the untreated sample, respectively. The BD was improved from 40.1% to 55.4%. These results indicate that alkaline pretreatment could be an efficient method for increasing methane production from asparagus stem.
State Key Lab of Pollution Control and Reuse, Tongji University, Shanghai 200092, China.
Xiaohua
X
Chen
State Key Lab of Pollution Control and Reuse, Tongji University, Shanghai 200092, China.
Yu
Y
Gu
State Key Lab of Pollution Control and Reuse, Tongji University, Shanghai 200092, China.
Xuefei
X
Zhou
State Key Lab of Pollution Control and Reuse, Tongji University, Shanghai 200092, China. Electronic address: zhangyalei@tongji.edu.cn.
Yalei
Y
Zhang
D000693:Anaerobiosis / Q000187:drug effects; D027761:Asparagus Plant / Q000737:chemistry*; D001673:Biodegradation, Environmental / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D002244:Carbon / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis / Q000187:drug effects; D008031:Lignin / Q000378:metabolism*; D008697:Methane / Q000096:biosynthesis*; D009584:Nitrogen / Q000032:analysis; D018547:Plant Stems / Q000737:chemistry* / Q000187:drug effects; D012972:Sodium Hydroxide / Q000494:pharmacology*; D014835:Volatilization / Q000187:drug effects
C036909:lignocellulose; D012972:Sodium Hydroxide; D002244:Carbon; D008031:Lignin; D009584:Nitrogen; D008697:Methane
Alkaline pretreatment; Asparagus stem; Biodegradability; Hydrolysis rate; Methane production