Using the properties of soil to speed up the start-up process, enhance process stability, and improve the methane content and yield of solid-state anaerobic digestion of alkaline-pretreated poplar processing residues

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• 作者：Yiqing Yao (1)
  Yang Luo (1)
  Tian Li (1)
  Yingxue Yang (1)
  Hongmei Sheng (1)
  Nolan Virgo (2)
  Yun Xiang (1)
  Yuan Song (1)
  Hua Zhang (1)
  Lizhe An (1)
  
  1. Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations ; School of Life Sciences ; Lanzhou University ; Lanzhou ; 730000 ; China
  2. Cuiying Honors College ; Lanzhou University ; Lanzhou ; 730000 ; China
  
• 关键词：SS ; AD ; PPRs ; Alkaline pretreatment ; Properties of soil ; Process performance ; Methane yield ; Structural changes
• 刊名：Biotechnology for Biofuels
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：7
• 期：1
• 全文大小：1,191 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Biotechnology
  Plant Breeding/Biotechnology
  Renewable and Green Energy
  Environmental Engineering/Biotechnology
  
• 出版者：BioMed Central
• ISSN：1754-6834

文摘

Background Solid-state anaerobic digestion (SS-AD) was initially adopted for the treatment of municipal solid waste. Recently, SS-AD has been increasingly applied to treat lignocellulosic biomass, such as agricultural and forestry residues. However, studies on the SS-AD process are few. In this study, the process performance and methane yield from SS-AD of alkaline-pretreated poplar processing residues (PPRs) were investigated using the properties of soil, such as buffering capacity and nutritional requirements. Results The results showed that the lignocellulosic structures of the poplar sample were effectively changed by NaOH pretreatment, as indicated by scanning electron microscopy and Fourier transform infrared spectra analysis. The start-up was markedly hastened, and the process stability was enhanced. After NaOH pretreatment, the maximum methane yield (96.1 L/kg volatile solids (VS)) was obtained under a poplar processing residues-to-soil sample (P-to-S) ratio of 2.5:1, which was 29.9% and 36.1% higher than that of PPRs (74.0 L/kg VS) and that of experiments without NaOH pretreatment (70.6 L/kg VS), respectively. During steady state, the increase in the methane content of the experiment with a P-to-S ratio of 2.5:1 was 4.4 to 50.9% higher than that of the PPRs. Degradation of total solids and volatile solids ranged from 19.3 to 33.0% and from 34.9 to 45.9%, respectively. The maximum reductions of cellulose and hemicellulose were 52.6% and 42.9%, respectively, which were in accordance with the maximal methane yield. T 80 for the maximum methane yield for the experiments with NaOH pretreatment was 11.1% shorter than that for the PPRs. Conclusions Pretreatment with NaOH and addition of soil led to a significant improvement in the process performance and the methane yield of SS-AD of PPRs. The changes in lignocellulosic structures induced by NaOH pretreatment led to an increase in methane yield. For the purpose of practical applications, SS-AD with soil addition is a convenient, economical, and practical technique.