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Improved production of short-chain fatty acids from waste activated sludge driven by carbohydrate addition in continuous-flow reactors: Influence of SRT and temperature

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  • Luo, Jingyang
  • Feng, Leiyu
  • Zhang, Wei
  • Li, Xiang
  • Chen, Hong
  • Wang, Dongbo
  • Chen, Yinguang

Abstract

During anaerobic fermentation of waste activated sludge (WAS), the production of short-chain fatty acids (SCFAs), especially propionic acid which is considered as the most preferred carbon source for enhanced biological phosphorus removal, can be improved by controlling the suitable mass ratio of carbon to nitrogen (C/N) and pH in batch mode. In this study the influences of solids retention time (SRT) and temperature on WAS hydrolysis and acidification in the continuous-flow systems in which the C/N ratio of WAS was modified by carbohydrate addition were investigated. Experimental results showed that the increase of SRT and temperature in a pertinent range benefited the hydrolysis of fermentation substrates and the accumulation of SCFAs, and SRT 8d and temperature 37°C were the most preferred conditions for the production of SCFAs, especially propionic acid. As there were more consumption of protein and carbohydrate and less production of methane at SRT 8d and temperature 37°C, more SCFAs were accumulated. Also, both the activities of key hydrolases and acid-forming enzymes and the ratio of acidogenic bacteria to methanogens showed good agreements with SCFAs production.

Suggested Citation

  • Luo, Jingyang & Feng, Leiyu & Zhang, Wei & Li, Xiang & Chen, Hong & Wang, Dongbo & Chen, Yinguang, 2014. "Improved production of short-chain fatty acids from waste activated sludge driven by carbohydrate addition in continuous-flow reactors: Influence of SRT and temperature," Applied Energy, Elsevier, vol. 113(C), pages 51-58.
    • Handle: RePEc:eee:appene:v:113:y:2014:i:c:p:51-58
    DOI: 10.1016/j.apenergy.2013.07.006
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    References listed on IDEAS

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    1. Chen, Yinguang & Luo, Jingyang & Yan, Yuanyuan & Feng, Leiyu, 2013. "Enhanced production of short-chain fatty acid by co-fermentation of waste activated sludge and kitchen waste under alkaline conditions and its application to microbial fuel cells," Applied Energy, Elsevier, vol. 102(C), pages 1197-1204.
    2. Nges, Ivo Achu & Liu, Jing, 2010. "Effects of solid retention time on anaerobic digestion of dewatered-sewage sludge in mesophilic and thermophilic conditions," Renewable Energy, Elsevier, vol. 35(10), pages 2200-2206.
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    1. Mengjia Tian & Feng Liu & Jiawen Guo & Wei Li & Mao Zhang & Xiang Li, 2022. "Effect of Different Acid and Base Potassium Ferrate Pretreatment on Organic Acid Recovery by Anaerobic Digestion of Sludge," IJERPH, MDPI, vol. 19(22), pages 1-15, November.
    2. Qiao Wang & Huan Li & Kai Feng & Jianguo Liu, 2020. "Oriented Fermentation of Food Waste towards High-Value Products: A Review," Energies, MDPI, vol. 13(21), pages 1-29, October.
    3. Li, Yue & Chen, Yinguang & Wu, Jiang, 2019. "Enhancement of methane production in anaerobic digestion process: A review," Applied Energy, Elsevier, vol. 240(C), pages 120-137.
    4. Zhou, Aijuan & Liu, Zhihong & Wang, Sufang & Chen, E. & Wei, Yaoli & Liu, Wenzong & Wang, Aijie & Yue, Xiuping, 2019. "Bio-electrolysis contribute to simultaneous bio-hydrogen recovery and phosphorus release from waste activated sludge assisted with prefermentation," Energy, Elsevier, vol. 185(C), pages 787-794.
    5. M S Karimi & S Ahmad & H Karamelikli & D T Dinç & Y A Khan & M T Sabzehei & S Z Abbas, 2021. "Dynamic linkages between renewable energy, carbon emissions and economic growth through nonlinear ARDL approach: Evidence from Iran," PLOS ONE, Public Library of Science, vol. 16(7), pages 1-15, July.

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