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Effect of Sludge Content on the Decomposition of Different Types of Food Waste

Author

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  • Mumtahina Binte Latif

    (Atwell, LLC, 9001 Airport Fwy Suite 660, North Richland Hills, TX 76180, USA)

  • Md Azijul Islam

    (Department of Civil Engineering, The University of Texas at Arlington, 701 W Nedderman Dr., Arlington, TX 76019, USA
    Department of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh)

  • Md Sahadat Hossain

    (Department of Civil Engineering, The University of Texas at Arlington, 701 W Nedderman Dr., Arlington, TX 76019, USA)

  • Sehneela Sara Aurpa

    (Department of Civil Engineering, The University of Texas at Arlington, 701 W Nedderman Dr., Arlington, TX 76019, USA)

Abstract

Food waste, which is the second largest component in landfills, generates excessive amounts of leachate and greenhouse gas. As a result, it has recently become a severe concern, mostly in the developing countries for its adverse impact on the environment. The addition of nutrients to organic waste limits the accumulation of volatile fatty acid (VFA) and accelerates the production of energy from food waste. The objective of the current study is to find out the effects of sludge addition on the decomposition and gas generation of separate components of food waste. This study was conducted for four combinations of reactors: two pairs containing meat and grain with the addition of a sludge content of 20% and 30%, respectively, as inoculum; another two pairs of reactors containing fruits and vegetables with a sludge content of 20% and 30%, respectively. Over the operation period, pH, volume, COD, and VFA tests were conducted for leachate while composition and volume measurements were done for the generated gas. Based on the results, it is observed that addition of sludge accelerated the decomposition of fruit and vegetable waste due to limited VFA accumulation compared to meat and grain. The maximum methane production was found in fruits and vegetable reactors at a rate of 6.7 L of methane per pound of food waste. For fruit and vegetable reactors, the CH 4 :CO 2 ratio increased to as high as 8.5. On the other hand, for the meat and grain reactors, the increase in CH 4 :CO 2 ratio was insignificant as they were in the lag phase.

Suggested Citation

  • Mumtahina Binte Latif & Md Azijul Islam & Md Sahadat Hossain & Sehneela Sara Aurpa, 2023. "Effect of Sludge Content on the Decomposition of Different Types of Food Waste," Sustainability, MDPI, vol. 15(3), pages 1-19, February.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:3:p:2782-:d:1056806
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    References listed on IDEAS

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    1. Navarro Ferronato & Vincenzo Torretta, 2019. "Waste Mismanagement in Developing Countries: A Review of Global Issues," IJERPH, MDPI, vol. 16(6), pages 1-28, March.
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    Cited by:

    1. Maria Râpă & Raluca Nicoleta Darie-Niță & George Coman, 2024. "Valorization of Fruit and Vegetable Waste into Sustainable and Value-Added Materials," Waste, MDPI, vol. 2(3), pages 1-21, July.

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