Concentrations of CO2 from composting under different treatments
¹Slovak University of Agriculture in Nitra, Faculty of Engineering, Department of Building Equipment and Technology Safety, Tr.A. Hlinku 2, SK94976 Nitra, Slovakia
²Local Union of Ponitrie villages for separation and management of waste, Korytovská 20, SK95141 Lužianky, Slovakia
³Slovak University of Agriculture in Nitra, Faculty of Engineering, Department of Machine Design, Tr.A. Hlinku 2, SK 94976 Nitra, Slovakia
The aim of this study was to analyse the production of CO2 concentrations in relation to the composting technology used. Three loose piles of bio-waste (V1, V2, V3) were created with the same volume. V1 reference pile was without any treatment. The biological preparation containing probiotic bacteria was added to the pile V2. The pile V3 was treated once a week by turning and watering. The degassing shafts were installed in each pile and the Multigas Monitor 1312 gas analyser with the Multipoint Sampler 1309 were used to measure of gas concentrations during the degradation process. Continuous 24-hour measurements of carbon dioxide concentrations from each pile were performed in the first, fourth, and seventh week of the degradation process to compare the amount of concentrations between piles in those weeks. At the beginning of the process, there were no significant differences in the production of CO2 concentrations from the monitored piles V1, V2 and V3. In the fourth week, significantly higher values of CO2 concentrations were recorded from the pile V3 (P < 0.05), which was turned and irrigated, than from V1 and V2. At week 7, significant differences were found between all treatments at the significance level (P < 0.05), with the highest values from the V3 pile. It has been shown that turning and humidifying results in the highest release of CO2 into the air, but in a more rapid decomposition of the microorganisms, that reducing the time required to achieve a stable compost product and increasing the efficiency of the composting plant.