Co-composting of Sewage Sludge, Green Waste, and Food Waste

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 11, Issue 1, 1100415
DOI: https://doi.org/10.13044/j.sdewes.d10.0415
Dijana Grgas1, Tea Štefanac1, Martina Barešić2, Merima Toromanović3, Jasmina Ibrahimpašić3, Tomislava Vukušić Pavičić1, Mirna Habuda-Stanić4, Zoran Herceg1, Tibela Landeka Dragičević1
1 University of Zagreb, Faculty of Food Technology and Biotechnology, Zagreb, Croatia
2 Matvej d.o.o., Zagreb, Croatia
3 University of Bihać, Biotechnical faculty, Bihać, Bosnia and Herzegovina
4 J.J. Strossmayer University of Osijek, Faculty of Food Technology, Osijek, Croatia

Abstract

Rapid population growth requires more intense production of food industry, with two major consequences: significant amount of food processing residues and more sewage sludge originating from biological wastewater treatment plant. Sludge is a big concern for the disposal for wastewater treatment plant. The European Union makes an effort regarding the reduction of organic fractions disposed at a landfill. Composting is a cost-effective and ecological-friendly alternative for managing biodegradable organic fractions. Experiments of co-composting of sewage sludge, green waste and food waste, at carbon/nitrogen ratios 8.75, 18.00 and 24.90, were performed during three months by monitoring of temperature, pH, moisture, carbon and nitrogen proportion, carbon/nitrogen ratio, and germination index. The results showed that co-composting of sewage sludge, green waste and food waste is effective and results in the production of quality compost

Keywords: Co-composting, Sewage sludge, Green waste, Food waste, Carbon/Nitrogen, Waste reduction

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