Composting is the controlled aerobic process carried out by successive microbial populations, combining both mesophilic and thermophilic activities, leading to the production of carbon-dioxide, water, minerals and stabilised organic matter (Subba-Rao, 1987; Chang et al., 2006; Huang et al., 2006). It is an age-old and well established process, which has been applied to agricultural waste management and utilisation, particularly for production of manure. It probably evolved following the heaping of agricultural refuse prior to overland dispersal. Wastes amenable to composting vary from highly heterogeneous organic mixtures, including polymers in urban refuse, to the more homogeneous agricultural wastes and residues, and sewage sludge (Maso and Blasi 2008; Sellami et al., 2008; Li et al., 2008; Lu et al., 2008; Chang et al., 2006; Huang et al., 2006; Yun et al., 2000; Bhamidimarri and Pandey, 1996; Mergaert and Swings, 1996; Thambirajah et al., 1995; Shuval et al., 1991).
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