Full-scale biodrying process of municipal solid waste

Kielce University of Technology, Faculty of Environmental, Geomatic and Energy Engineering, Division of Waste Management, 25-314 Kielce, al. Tysiąclecia PP 7, Poland

^* Corresponding author: mdebicka@tu.kielce.pl

Abstract

The paper presents the results obtained in the full-scale waste biodrying reactor. The studied facility includes in the biological stage a rectangular-shaped, galvanized steel reactor equipped with a module for active aeration connected with a stove and a bio-filter for removing odours. The undersize fraction (Ø <80 mm) of the municipal solid waste (MSW) that undergoes mechanical pretreatment is treated by 14^th days in the 150 m³ capasity reactor. Initial moisture content of the untreated waste was 54.65%. Moisture content was declined gradually during biodrying process. Temperature changes during 14th days of biodrying process were monitored with the maximum temperature 70°C. To assess the degree of stabilization of the biodried waste, the determination of the O2 uptake was measured. The oxygen demand of untreated waste was 53.16 mg O₂/g d.m. and after 14^th days for biodried waste oxygen consumption was 19.78 mg O₂/g d.m. The results obtained in studies by respirometric dynamic method of oxygen uptake (expressed as O₂/96h parameter) had been compared to the results performed using the static method, where AT₄ is the applied indicator.