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Multiple Effects of Different Nickel Concentrations on the Stability of Anaerobic Digestion of Molasses

Author

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  • Sohail Khan

    (State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Science and Technology, Guangxi University, Nanning 530005, China)

  • Fuzhi Lu

    (State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Science and Technology, Guangxi University, Nanning 530005, China)

  • Muhammad Kashif

    (State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Science and Technology, Guangxi University, Nanning 530005, China)

  • Peihong Shen

    (State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Science and Technology, Guangxi University, Nanning 530005, China)

Abstract

Molasses is a highly thick by-product produced after sugarcane crystallization constitutes large amounts of biodegradable organics. These organic compounds can be converted to renewable products through anaerobic digestion. Nevertheless, its anaerobic digestion is limited due to its high chemical oxygen demand (COD) and ion concentration. The effects of nickel (Ni 2+ ) on the stability of anaerobic digestion of molasses were established by studying the degradation of organic matter (COD removal rate), biogas yield, methane content in the biogas, pH, and alkalinity. The results showed that there were no significant effects on the stability of pH and alkalinity. Increased COD removal rate and higher methane content was observed by 2–3% in the digesters receiving 2 and 4 mg/L of Ni 2+ in the first phase of the experiment. Ni 2+ supplemented to reactors at concentration 2 mg/L enhanced biogas yield. Overall, it is suggested that the addition of Ni 2+ has some effects on the enhancement of biogas yield and methane contents but has no obvious effects on the long-lasting stability of the molasses digestion.

Suggested Citation

  • Sohail Khan & Fuzhi Lu & Muhammad Kashif & Peihong Shen, 2021. "Multiple Effects of Different Nickel Concentrations on the Stability of Anaerobic Digestion of Molasses," Sustainability, MDPI, vol. 13(9), pages 1-11, April.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:9:p:4971-:d:545709
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    References listed on IDEAS

    as
    1. Sohail Khan & Fuzhi Lu & Qiong Jiang & Chengjian Jiang & Muhammad Kashif & Peihong Shen, 2020. "Assessment of Multiple Anaerobic Co-Digestions and Related Microbial Community of Molasses with Rice-Alcohol Wastewater," Energies, MDPI, vol. 13(18), pages 1-16, September.
    2. Jiang, Y. & Heaven, S. & Banks, C.J., 2012. "Strategies for stable anaerobic digestion of vegetable waste," Renewable Energy, Elsevier, vol. 44(C), pages 206-214.
    3. Gustavsson, Jenny & Shakeri Yekta, Sepehr & Sundberg, Carina & Karlsson, Anna & Ejlertsson, Jörgen & Skyllberg, Ulf & Svensson, Bo H., 2013. "Bioavailability of cobalt and nickel during anaerobic digestion of sulfur-rich stillage for biogas formation," Applied Energy, Elsevier, vol. 112(C), pages 473-477.
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    Cited by:

    1. Rajesh Banu Jeyakumar & Godvin Sharmila Vincent, 2022. "Recent Advances and Perspectives of Nanotechnology in Anaerobic Digestion: A New Paradigm towards Sludge Biodegradability," Sustainability, MDPI, vol. 14(12), pages 1-18, June.
    2. Nicoleta Ungureanu & Valentin Vlăduț & Sorin-Ștefan Biriș, 2022. "Sustainable Valorization of Waste and By-Products from Sugarcane Processing," Sustainability, MDPI, vol. 14(17), pages 1-27, September.

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