Effect of Intermittent Negative Ventilation in Biodrying Process for Treating Pre-Shredded Waste

Abstract

A pre-shredded waste with 49.4% of moisture content from a municipality in Thailand was treated in biodrying lysimeters with intermittent negative ventilation at the rate of 0.5 m3/kgwaste/day. Two air patterns were set with an interval of 30 min run/30 min stop (T1) and 30 min run/60 min stop (T2) and ran for seven days. The highest temperature was found in T2 at about 68.3 °C. The degradation of degradable materials was at 3.49% and 2.9% in T2 and T1, respectively. In T2, the weight could be reduced from 90 kg to 79.9 kg, corresponding to 11.2% of weight reduction. After seven days, moisture content and the heating value was in acceptable requirement of Refuse Derived Fuel (RDF) for local cement plants. The highest moisture removal was presented in T2 which can reduce the moisture content of 58.24% and the heating value was increased of 42.75% from initial heating value. Based on the local RDF requirement, it could be concluded that T2 is the best performance in this study with 20.63% of final moisture content and 17,719 kJ/kg of heating value.