Effects of Recirculation of Exhaust Air in Rotary Drum Composter on Composting Properties and Energy Consumption
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ORIGINAL PAPER
Effects of Recirculation of Exhaust Air in Rotary Drum Composter on Composting Properties and Energy Consumption Cenk Soyöz1 · Kamil Ekinci1 · Şeref Kilic2 Received: 7 March 2020 / Accepted: 19 September 2020 © Springer Nature B.V. 2020
Abstract Rotary drum composting appears to be a good option for decentralized composting. While aiming to transform the feedstock organic matter into stable humic compounds, composting should also take into account energy conservation. This experimental study quantified the impacts of exhaust air of a 0.38 m 3 fully-automatic rotary drum composter on output parameters, decomposition rates, and energy consumption per loss of organic matter. Decomposition rates of labile and recalcitrant parts were evaluated using a multi-component kinetic model. The recirculation processes of exhaust air in the rotary drum composting enhanced the decomposition rates and maintained a better heat retention. In particular, the rotary drum composter with the dynamic gas recirculation system led to more matured material according to final C/N and NH+4 − N∕NO−3 − N ratios, and germination index as well as to less energy consumption per loss of organic matter in reaching the stabile humus compounds in the final material as fast as possible. Graphic Abstract
Keywords Rotary drum composting · Recirculation of exhaust air · Decomposition rate · Kinetics * Kamil Ekinci [email protected]
Statement of Novelty
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The novelty of this manuscript lies in the first quantification of the impacts of the recirculation of exhaust air the rotary drum composter on the composting process, and energy consumption. Our results showed that the rotary drum
Department of Agricultural Machinery and Technologies Engineering, Faculty of Agriculture, Isparta University of Applied Sciences, 32260 Isparta, Turkey
Department of Environmental Engineering, Faculty of Engineering, Ardahan University, 75002 Ardahan, Turkey
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Waste and Biomass Valorization
composter with a variable rate of the gas recirculation led to more stabilized and mature composts, and the energy saving based on final carbon/nitrogen (C/N) ratio, germination index, and less energy consumption per organic matter loss. It is believed that our experimental results provide practical insights into compost production by the compost sector.
the rotary drum composting on composting properties and energy consumption. The optimum operational conditions during the thermophilic stage in the rotary drum composting may accelerate the decomposition of composting material and lead to the desired composting material with the lower energy input.
Introduction
Materials and Methods
Recently, the demand for rotary drum composting has grown [1] owing to its efficient use in the decentralized composting systems [2]. A rotary drum composter as a reactor system facilitates the generation of a more homogenous end-product called compost after the intensive degradation phase for composting material in a cylindrical, horizon
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