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
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


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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