Mineralization in a Calcareous Soil of a Sewage Sludge Composted With Different Organic Residues

摘要: Three sewage sludge composts were obtained from mixtures of an aerobic (AS) and three organic wastes differing widely in chemical composition: extremely biodegradable waste (municipal solid waste, MSW), a plant residue (grape debris) with carbon fraction not easily mineralizable (peat residue). The following made, the proportions referring to their total content: AS-MSW 1/1, AS-GRAPE 3/1 AS-PEAT 1/1. These composted over 3 months open air periodical turning, left mature afterwards for 4 months. Uncomposted mixtures, before after maturation, incubated 38 days, under laboratory conditions, calcareous soil CO2 emission samples periodically measured. Uncomposted emitted much greater quantities than those composted, whether or maturation period. Both at beginning end composting, differences observed between amount by mixture containing peat others. However, tended even out composts, reaching maximum 600 mg per 100 g carbon. This shows that, although mineralization depends on nature mixed sludge, it tends when have undergone composting.