Biomeasurement of heavy metal in source separation BMW composting

Biowaste, the source separately collected organic fraction of municipal solid waste, can be reused for soil conditioning after composting. In this way, environmentally harmful waste management strategies, such as landfilling or incineration, can be reduced. However, frequent application of composts to soil systems may lead to the accumulation of heavy metals in soils, and therefore legal criteria were laid down in a decree to guarantee the safe use of composts. The heavy metal content of biowaste-composts frequently exceeds the legal standards, and thus raises a conflict between two governmental policies: the recycling of solid waste on the one hand, and the protection of natural ecosystems and public health on the other hand. In this study, Cd, Cu, Pb and Zn, these four heavy metal concentrations of BMW source separation,which were higher with the lost of organic matter during the 21 days composting experiment, specially during the first 7 days phase, all the source separation BMW heavy metals were under the limited concentration and fitted farmland utilized.