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Effects of Magnetic Biochar Addition on Mesophilic Anaerobic Digestion of Sewage Sludge

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  • Li Jiang

    (College of Resources and Environment, Yangtze University, Wuhan 430100, China
    State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

  • Yanru Zhang

    (State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

  • Yi Zhu

    (College of Resources and Environment, Yangtze University, Wuhan 430100, China
    State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

  • Zhongliang Huang

    (State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

  • Jing Huang

    (State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

  • Zijian Wu

    (State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

  • Xuan Zhang

    (State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

  • Xiaoli Qin

    (State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

  • Hui Li

    (College of Resources and Environment, Yangtze University, Wuhan 430100, China
    State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China)

Abstract

As a low-cost additive to anaerobic digestion (AD), magnetic biochar (MBC) can act as an electron conductor to promote electron transfer to enhance biogas production performance in the AD process of sewage sludge and has thus attracted much attention in research and industrial applications. In the present work, Camellia oleifera shell (COS) was used to produce MBC as an additive for mesophilic AD of sewage sludge, in order to explore the effect of MBC on the mesophilic AD process and its enhancement mechanism. Analysis by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectrometry (FTIR), and X-ray diffraction (XRD) further confirmed that biochar was successfully magnetized. The yield of biogas from sewage sludge was enhanced by 14.68–39.24% with the addition of MBC, and the removal efficiency of total solid (TS), volatile solids (VS), and soluble chemical oxygen demand (sCOD) were 28.99–46.13%, 32.22–48.62%, and 84.18–86.71%, respectively. According to the Modified Gompertz Model and Cone Model, the optimum dosage of MBC was 20 mg/g TS. The maximum methane production rate (R m ) was 15.58% higher than that of the control reactor, while the lag-phase (λ) was 43.78% shorter than the control group. The concentration of soluble Fe 2+ and Fe 3+ were also detected in this study to analyze the function of MBC for improving biogas production performance from sewage sludge. The biogas production was increased when soluble Fe 3+ was reduced to soluble Fe 2+ . Overall, the MBC was beneficial to the resource utilization of COS and showed a good prospect for improving mesophilic AD performance.

Suggested Citation

  • Li Jiang & Yanru Zhang & Yi Zhu & Zhongliang Huang & Jing Huang & Zijian Wu & Xuan Zhang & Xiaoli Qin & Hui Li, 2023. "Effects of Magnetic Biochar Addition on Mesophilic Anaerobic Digestion of Sewage Sludge," IJERPH, MDPI, vol. 20(5), pages 1-14, February.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:5:p:4278-:d:1083293
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    References listed on IDEAS

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