One-stage and two-stage anaerobic digestion of lipid-extracted algae

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• 作者：Yan Li ; Mintian Gao ; Dongliang Hua ; Jie Zhang ; Yuxiao Zhao…
• 关键词：Biogas ; Methane ; Algal residues ; One stage ; Two stage
• 刊名：Annals of Microbiology
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：65
• 期：3
• 页码：1465-1471
• 全文大小：440 KB
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• 作者单位：Yan Li (1) (2)
  Mintian Gao (1) (2)
  Dongliang Hua (1) (2)
  Jie Zhang (1) (2)
  Yuxiao Zhao (1) (2)
  Hui Mu (1) (2)
  Haipeng Xu (1) (2)
  Xiaohui Liang (1) (2)
  Fuqiang Jin (1) (2)
  Xiaodong Zhang (1) (2)
  
  1. Key Laboratory for Biomass Gasification Technology of Shandong Province, Jinan, 250014, China
  2. Energy Research Institute of Shandong Academy of Sciences, Jinan, 250014, China
  
• 刊物主题：Microbiology; Microbial Genetics and Genomics; Microbial Ecology; Fungus Genetics; Medical Microbiology; Applied Microbiology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-2044

文摘

Waste-grown microalgae are a potentially important biomass for wastewater treatment. The lipid accumulated in microalgae could be utilized as feedstocks for biodiesel production. The algal residues, as major by-products derived from lipid extraction, mainly consist of carbohydrate and protein, making anaerobic digestion an efficient way to recover energy. The conversion of lipid-extracted algal residues into methane plays dual role in renewable energy production and sustainable development of microalgal biodiesel industry. Therefore, an anaerobic fermentation process for investigation of the methane production potential of algal residues was conducted in this paper. The effect of inoculum to substrate ratios (ISRs) on the methane production by anaerobic digestion of Chlorella sp. residue in a single stage was evaluated. The maximum methane yield of 195.6?ml CH4/g volatile solid (VS) was obtained at an ISR of 1:1. The stability and progress of the reaction from algal residues to methane were monitored by measuring the pH, volatile fatty acids (VFAs), total ammoniacal nitrogen (TAN), and methane volume. Based on the results of one-stage experiments, two-stage technology was proposed and was found to be more suitable for high organic load. The optimum conditions for acidogenesis and methanogenesis are indicated in this paper.