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Nutrient recovery from pineapple waste through controlled batch and continuous vermicomposting systems.

Ahamada Zziwa1, Joseph Jjagwe1, Simon Kizito2

  • 1Department of Agricultural and Biosystems Engineering, College of Agricultural and Environmental Sciences, Makerere University, P.O. BOX, 7062, Kampala, Uganda.

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Summary

Continuous vermicomposting of pineapple waste with cattle manure enhances nutrient recovery and earthworm biomass. This method offers a sustainable solution for agricultural waste management, improving soil fertility.

Keywords:
Material flow analysisNutrient recoveryPineapple wasteRecyclingVermicompost

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Area of Science:

  • Environmental Science
  • Agronomy
  • Soil Science

Background:

  • Pineapple waste disposal poses environmental and health challenges.
  • Pineapple waste is rich in plant nutrients, offering potential for soil fertility enhancement.
  • Nutrient recovery from agricultural waste is crucial for sustainable agriculture.

Purpose of the Study:

  • To evaluate physico-chemical parameter variations in batch and continuous vermicomposting systems for pineapple waste.
  • To compare waste reduction efficiency and nutrient recovery between batch and continuous vermicomposting.
  • To assess the potential of vermicomposting for nutrient recovery from pineapple waste.

Main Methods:

  • Pineapple peels (PW) and cattle manure (CM) were used as substrates in a 4:1 ratio (w/w).
  • Batch (B) and continuous (C) vermicomposting systems were compared over 60 days.
  • Control reactors contained 100% CM in both feeding modes.

Main Results:

  • Waste degradation reached 60% (batch) and 54% (continuous), with earthworm biomass increasing by 57% (batch) and 129% (continuous).
  • Total phosphorus increased in both systems, with higher levels in batch vermicomposting.
  • Continuous systems showed higher nutrient retention (N, P, K, C) in vermicompost compared to batch systems.

Conclusions:

  • Continuous vermicomposting systems are more efficient for pineapple waste treatment, yielding higher earthworm biomass and greater nutrient retention.
  • Vermicomposting offers a viable pathway for nutrient recovery from pineapple waste, contributing to soil fertility.
  • Continuous systems are recommended for optimizing pineapple waste vermicomposting.