Volatile fatty acids distribution during acidogenesis of algal residues with pH control

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• 作者：Yan Li (1)
  Dongliang Hua (1)
  Jie Zhang (1)
  Yuxiao Zhao (1)
  Haipeng Xu (1)
  Xiaohui Liang (1)
  Xiaodong Zhang (1)
  
• 关键词：Acidogenesis ; Algal residues ; Mesophilic ; Volatile fatty acid ; Ammonia
• 刊名：World Journal of Microbiology and Biotechnology
• 出版年：2013
• 出版时间：June 2013
• 年：2013
• 卷：29
• 期：6
• 页码：1067-1073
• 全文大小：350KB
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• 作者单位：Yan Li (1)
  Dongliang Hua (1)
  Jie Zhang (1)
  Yuxiao Zhao (1)
  Haipeng Xu (1)
  Xiaohui Liang (1)
  Xiaodong Zhang (1)
  
  1. Key Laboratory for Biomass Gasification Technology of Shandong Province, Energy Research Institute of Shandong Academy of Sciences, Jinan, 250014, China
  
• ISSN：1573-0972

文摘

The anaerobic acidification of protein-rich algal residues with pH control (4, 6, 8, 10) was studied in batch reactors, which was operated at mesophilic(35?°C) condition. The distribution of major volatile fatty acids (VFAs) during acidogenesis was emphasized in this paper. The results showed that the acidification efficiency and VFAs distribution in the acid reactor strongly depended on the pH. The main product for all the runs involved acetic acid except that the proportion of butyric acid acidified at pH 6 was relatively higher. The other organic acids remained at lower levels. The VFAs yield reached the maximum value with about 0.6?g VFAs/g volatile solid (VS) added as pH was 8, and also the content of total ammonia nitrogen (TAN) reached the highest values of 9,629?mg/l. Low acidification degrees were obtained under the conditions at pH 4 and 10, which was not suitable for the metabolism of acidogens. Hydralic retention time (HRT) required for different conditions varied. As a consequence, it was indicated that pH was crucial to the acidification efficiency and products distribution. The investigation of acidogenesis process, which was producing the major substrates, short-chain fatty acids, would play the primary role in the efficient operation of methanogenesis.