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Use what’s left? Yes, please! - Evaluation of the energetic potential of the residuals from Uganda’s composting plants

The sieve rejects of two composting plants built in Uganda within the framework of the UN Clean Development Mechanism were sampled in order to investigate their recycling and refuse-derived fuel potentials.

The samples were sorted into 15 main- and 6 sub-fractions. The share of recyclables is 21% for Plant 1 and 53% for Plant 2. The high calorific fractions make up 21% and 22%, respectively. The heavy metal and chlorine contents as well as the lower heating value of the samples were investigated. The results show that all heavy metal concentrations, except for cadmium, are low enough for the utilisation as refuse-derived fuel. The lower heating values were calculated based on the material fractions of the samples. For Plant 1 the calculated heating value is 11 MJ/kg, for Plant 2 12 MJ/kg, making them suitable for the utilisation in the secondary firing system of a cement kiln. The chlorine contents are 1% for Plant 1 and 3% for Plant 2. According to the results, the sieve rejects can be used as refuse-derived fuels if the cadmium content can be reduced. This could help reducing the cement industry’s CO2 emissions and the pollution in the surroundings of the plants. 

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Recy & Depotech 2024 (Dezember 2024)
Seiten:	6
Preis:	€ 3,00
Autor:	Sara Neuburg Francis Okori Richard David Lee Therese Schwarzböck Professor Dipl.-Ing. Dr. Helmut Rechberger
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