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Effects of Salt on Anaerobic Digestion of Food Waste with Different Component Characteristics and Fermentation Concentrations

Author

Listed:
  • Xiaofeng Li

    (Faculty of Geosciences and Environmental Engineering, South-West Jiaotong University, Chengdu 611756, China)

  • Jingjing Huang

    (Institute for Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, 70569 Stuttgart, Germany)

  • Yiyun Liu

    (Faculty of Geosciences and Environmental Engineering, South-West Jiaotong University, Chengdu 611756, China)

  • Tao Huang

    (Faculty of Geosciences and Environmental Engineering, South-West Jiaotong University, Chengdu 611756, China)

  • Claudia Maurer

    (Institute for Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, 70569 Stuttgart, Germany)

  • Martin Kranert

    (Institute for Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, 70569 Stuttgart, Germany)

Abstract

Effects of salt on anaerobic digestion are dosage-dependent. As salt is a widely used condiment in food processing, effects of salt are bound to be considered when food waste is digested. In this study, salt addition effects (0, 2, 4, 6, 9, 12 g∙L −1 ) on biogas and methane yields and kinetics of biogas production were researched. Meanwhile, component characteristics (food waste featured in carbohydrate, protein and fat, respectively) and fermentation concentrations (5 and 8 gVS∙L −1 ) were also taken into consideration. Results showed that 2–4 g∙L −1 salt addition was the optimal addition dosage for AD systems as they not only have the maximum biogas and methane yields, but also the maximum vs. removal in most cases. Also, according to the results of a modified Gompertz model, which is used to predict biogas and methane production rates, suitable salt addition can accelerate biogas production, improving the maximum biogas production rate ( R max ). Factorial design (2 × 2) proved that interaction of salt and fermentation concentrations was significant for food waste featured with carbohydrate and with protein ( p < 0.05). High salt addition and fermentation concentration can break the AD system when the feeding material was food waste featured with carbohydrate, but for food waste featured with protein, interaction of fermentation concentrations and salt addition can alleviate inhibition degrees.

Suggested Citation

  • Xiaofeng Li & Jingjing Huang & Yiyun Liu & Tao Huang & Claudia Maurer & Martin Kranert, 2019. "Effects of Salt on Anaerobic Digestion of Food Waste with Different Component Characteristics and Fermentation Concentrations," Energies, MDPI, vol. 12(18), pages 1-14, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:18:p:3571-:d:268458
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    References listed on IDEAS

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    1. Browne, James D. & Allen, Eoin & Murphy, Jerry D., 2014. "Assessing the variability in biomethane production from the organic fraction of municipal solid waste in batch and continuous operation," Applied Energy, Elsevier, vol. 128(C), pages 307-314.
    2. Zhang, Jingxin & Li, Wangliang & Lee, Jonathan & Loh, Kai-Chee & Dai, Yanjun & Tong, Yen Wah, 2017. "Enhancement of biogas production in anaerobic co-digestion of food waste and waste activated sludge by biological co-pretreatment," Energy, Elsevier, vol. 137(C), pages 479-486.
    3. Zhang, Cunsheng & Su, Haijia & Baeyens, Jan & Tan, Tianwei, 2014. "Reviewing the anaerobic digestion of food waste for biogas production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 38(C), pages 383-392.
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    Cited by:

    1. Huayong Zhang & Di An & Yudong Cao & Yonglan Tian & Jinxian He, 2021. "Modeling the Methane Production Kinetics of Anaerobic Co-Digestion of Agricultural Wastes Using Sigmoidal Functions," Energies, MDPI, vol. 14(2), pages 1-12, January.
    2. Bedoić, Robert & Špehar, Ana & Puljko, Josip & Čuček, Lidija & Ćosić, Boris & Pukšec, Tomislav & Duić, Neven, 2020. "Opportunities and challenges: Experimental and kinetic analysis of anaerobic co-digestion of food waste and rendering industry streams for biogas production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 130(C).
    3. Yiyun Liu & Tao Huang & Xiaofeng Li & Jingjing Huang & Daoping Peng & Claudia Maurer & Martin Kranert, 2020. "Experiments and Modeling for Flexible Biogas Production by Co-Digestion of Food Waste and Sewage Sludge," Energies, MDPI, vol. 13(4), pages 1-13, February.

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