2000/11/1/ · Through a comprehensive study of eight control objectives of composting process, i.e. COD, VM (Volatile material), starch, cellulose, C/N ratio, temperature, moisture content and oxygen consumption rate, Zhang et al. (1988) put forward that the compost was mature when the oxygen consumption rate was about 0.02–0.1ΔO 2 % min −1, varying with the