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Intensification of Short Chain Fatty Acid Production during the Alkaline Pretreatment of Fine-Sieving Fractions

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Listed:
  • Yanqing Duan

    (College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Aijuan Zhou

    (College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Engineer Research Institute of Sludge Disposition and Resources, Taiyuan University of Technology, Taiyuan 030024, China)

  • Xiuping Yue

    (College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Shanxi Engineer Research Institute of Sludge Disposition and Resources, Taiyuan University of Technology, Taiyuan 030024, China)

  • Zhichun Zhang

    (College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Yanjuan Gao

    (College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Yanhong Luo

    (College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    School of Chemical and Environmental Engineering, North University of China, Taiyuan 030051, China)

Abstract

Maximizing the internal carbon sources in raw wastewater was found to be an alternative option to alleviate the financial burden in external carbon sources (ECS) addition to the biological nutrient removal (BNR) process. Based on previous studies on particulate recovery via fine-sieving technologies, alkali pretreatment was used to improve the short-chain fatty acid (SCFA) production from the fine-sieving fractions (FSF). Hydrolysis performance and methane production were monitored to evaluate the reasons for the SCFA boost. Besides, the microbial community structure was evaluated by high-throughput sequencing. Furthermore, mass balance and financial benefits were preliminarily estimated. The results showed that alkali pretreatment effectively promoted the generation of SCFAs with 234 mg/g volatile suspended solids (VSS), almost double that of the control test. This was partially attributed to the efficient hydrolysis, with soluble polysaccharides and protein increased by 2.1 and 1.2 times compared to that of the control, respectively. Inhibition of methanogens was also devoted to the accumulation of SCFAs, with no methane production until 150 h at high pH value. Finally, a preliminary evaluation revealed that 44.51 kg/d SCFAs could be supplied as the electron donor for denitrification, significantly reducing the cost in ECS addition for most wastewater treatment plants (WWTPs) with carbon insufficiency.

Suggested Citation

  • Yanqing Duan & Aijuan Zhou & Xiuping Yue & Zhichun Zhang & Yanjuan Gao & Yanhong Luo, 2020. "Intensification of Short Chain Fatty Acid Production during the Alkaline Pretreatment of Fine-Sieving Fractions," Energies, MDPI, vol. 13(18), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4690-:d:410843
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    References listed on IDEAS

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    1. Gu, Yifan & Li, Yue & Li, Xuyao & Luo, Pengzhou & Wang, Hongtao & Robinson, Zoe P. & Wang, Xin & Wu, Jiang & Li, Fengting, 2017. "The feasibility and challenges of energy self-sufficient wastewater treatment plants," Applied Energy, Elsevier, vol. 204(C), pages 1463-1475.
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