2.3. Compost conditioning and characterization
The compost was sieved discarding fragments P0.5 cm and large inert objects such as glass, stones, and metal pieces were manually removed to obtain a homogeneous material. The total dry solids content was determined by drying the compost at 105 C until a constant weight was achieved (Eq. (1)). The total 448 M.P. Balaguer et al. / Chemical Engineering Journal 262 (2015) 447–455 volatile solids content was evaluated by placing the dried compost in a muffle at 550 C during 24 h (Eq. (2)).