The initial amount of biowastes was separated in two windrows of 20 t each. The materials batch was mixed with the compostable plastics (1.28 wt%), the control batch was used as is. Both batches were monitored by measuring temperature and humidity. The temperature of the two batches was recorded at 8 points distributed in the composting pile at 0.5 m and 1.5 m depth using large scale thermocouples (Hanna instruments, France). The moisture content was analysed by drying a representative sample in an oven at 103 ± 1°C until constant weight.