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Acceleration of Composting by Addition of Clinker to Tea Leaf Compost

Author

Listed:
  • Nobuki Morita

    (Kochi Prefectural Agricultural Research Center, 1100 Hataeda, Nankoku 783-0023, Japan)

  • Yo Toma

    (Research Faculty of Agriculture, Hokkaido University, Kita-9, Nishi-9, Kita-ku, Sapporo 060-8589, Japan)

  • Hideto Ueno

    (Graduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan)

Abstract

The disposal of tea leaves discarded in the tea beverage market and clinker from coal-fired power plants has an impact on the environment; however, there are no reported cases of their combination for composting. Therefore, this study evaluated the effect of adding clinker from a coal-fired power plant to compost based on tea leaves, an organic waste product, on the composting rate and quality. The tea leaves-only compost was designated as Clinker 0%, and composts with 20% ( w / w ), 40% ( w / w ), and 60% ( w / w ) tea leaves supplemented with clinker were designated as Clinker 20, 40, and 60%, respectively. Each mixed material was placed in a 35 L polypropylene container with a lid and allowed to compost for 95 days. The composting rate was evaluated by the chemical oxygen demand (COD) in hot water extract and plant tests using juvenile komatsuna ( Brassica rapa var. perviridis ). The addition of clinker reduced the COD at the beginning of composting by 52.0, 74.3, and 86.7% in Clinker 20, 40, and 60%, respectively, compared to Clinker 0%. Furthermore, root elongation one month after composting was inhibited by Clinker 0% (60.1% relative to distilled water), but not by the addition of clinker (91.7–102.7% relative to distilled water). This suggests that the addition of clinker to tea leaf compost may accelerate composting.

Suggested Citation

  • Nobuki Morita & Yo Toma & Hideto Ueno, 2024. "Acceleration of Composting by Addition of Clinker to Tea Leaf Compost," Waste, MDPI, vol. 2(1), pages 1-13, February.
    • Handle: RePEc:gam:jwaste:v:2:y:2024:i:1:p:4-84:d:1331084
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    References listed on IDEAS

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    1. Khayum, Naseem & Anbarasu, S. & Murugan, S., 2018. "Biogas potential from spent tea waste: A laboratory scale investigation of co-digestion with cow manure," Energy, Elsevier, vol. 165(PB), pages 760-768.
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