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<p>The disposal of residual animal fats poses significant environmental challenges. This study aims to explore vermicomposting as an eco-friendly solution for managing this waste. We investigated the vermicomposting of animal fats combined with varying ratios of straw pellets to ensure appropriate C:N ratio, pH, and porosity. We used <i>Eisenia andrei</i> earthworms and established five treatments: four with different fat-to-straw ratios (1:0, 3:1, 1:1, 1:3) and one control without earthworms (1:1). Our findings indicate that adding straw pellets enhances the vermicomposting process. The most effective ratio was 1:3 (fat-to-straw), ensuring good porosity and producing high-quality fertilizer. At a 1:1 ratio, we observed a positive correlation between total calcium (Ca) content and the number of earthworms, as well as with pH, total potassium (K), and magnesium (Mg) levels. The most substantial reduction in heavy metals was observed for molybdenum (Mo) at the 1:3 ratio (62%) and zinc (Zn) at the 1:1 ratio (54%). The 1:1 ratio also resulted in higher microorganism levels and statistically significantly higher enzymatic activity compared to other variants with earthworms. Despite occasional zinc or copper contamination, enzymatic activity remained at high levels, and heavy metal levels decreased to acceptable values. This research highlights the potential of vermicomposting for managing animal fat waste and producing nutrient-rich fertilizers, offering valuable insights into sustainable waste management.</p>

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Handling residual animal fats by vermicomposting with continuous feeding

  • 期刊论文

  • 发表日期：

    2025年3月7日

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  • Tereza Hřebečková,
  • Milan Hrčka,
  • Aleš Hanč

摘要

The disposal of residual animal fats poses significant environmental challenges. This study aims to explore vermicomposting as an eco-friendly solution for managing this waste. We investigated the vermicomposting of animal fats combined with varying ratios of straw pellets to ensure appropriate C:N ratio, pH, and porosity. We used Eisenia andrei earthworms and established five treatments: four with different fat-to-straw ratios (1:0, 3:1, 1:1, 1:3) and one control without earthworms (1:1). Our findings indicate that adding straw pellets enhances the vermicomposting process. The most effective ratio was 1:3 (fat-to-straw), ensuring good porosity and producing high-quality fertilizer. At a 1:1 ratio, we observed a positive correlation between total calcium (Ca) content and the number of earthworms, as well as with pH, total potassium (K), and magnesium (Mg) levels. The most substantial reduction in heavy metals was observed for molybdenum (Mo) at the 1:3 ratio (62%) and zinc (Zn) at the 1:1 ratio (54%). The 1:1 ratio also resulted in higher microorganism levels and statistically significantly higher enzymatic activity compared to other variants with earthworms. Despite occasional zinc or copper contamination, enzymatic activity remained at high levels, and heavy metal levels decreased to acceptable values. This research highlights the potential of vermicomposting for managing animal fat waste and producing nutrient-rich fertilizers, offering valuable insights into sustainable waste management.