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Waste compost quality assessment for efficient use in agriculture: case of the developing countries

Abstract

This study aims to evaluate the quality of solid waste compounds in the Khenifra region (Morocco) and use them as an organic additive. Composting tests were undertaken at the household waste disposal and recovery site in the Khenifra city. When they enter the site, the waste undergoes a physical treatment which consists of manual sorting to remove the coarse elements, by screening through a sieve with an 80 mm mesh to reduce the waste heterogeneity. The fermentable organic matter resulting from these treatments is put back into windrows. A turnaround every two weeks to gradually homogenize waste and watering helps maintain high humidity. The evaluation criteria on which they were based were: maturity, particle size, organic matter, heavy metals and pathogenic microorganisms. The results revealed that the incorporation of a 25% compost dose into the soil resulted in a 100% germination rate for both crops (corn and sunflower), which shows that the obtained composts were mature and well decomposed. The C/N ratios which varied in the range of 13–15% reinforce the good result. The pH is slightly basic and varies between 7.9 and 8.1. Fine particles represented 61% while particles > 2 mm in size have a proportion of about 40% confirming this result. The average organic matter content in composts is approximately 19–20%, carbon 12%, nitrogen 0.77%, perfectly complying with international standards. The results for heavy metals also show relatively high values but remain within the standards with a predominance of Zn (161 mg.kg-1) and Cu (76 mg.kg-1). Microbiological analyses revealed the presence of fecal coliform bacteria and fungi of the genus Aspergillus. In general, the composts produced by solid waste in developing countries are of good quality and can be used as organic fertilizer for the soil.

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Acknowledgements

The authors are pleased to acknowledge the Khenifra province for providing the facilities for the research. The authors wish to thank the governor of Khenifra province and the president of the Atlas group. They also thank the staff of the company SEMGAT for their help and coordination.

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Correspondence to Driss Elhamdouni.

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Communicated by M. V. Alves Martins

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Elhamdouni, D., Arioua, A., Karaoui, I. et al. Waste compost quality assessment for efficient use in agriculture: case of the developing countries. J. Sediment. Environ. 6, 395–401 (2021). https://doi.org/10.1007/s43217-021-00060-9

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Keywords

  • Compost of Solid Waste
  • Compost Maturity
  • Solid Waste
  • Developing countries