Characterization of humic substances developed during the composting of class II A organic solid waste: a case study in a composting plant in Montenegro, Brazil

Abstract
 The abundance of organic waste generated by agro-industrial activities leads to the need find alternatives for adequate destinations these. Composting is most viable alternative due its low cost, ease operation and generation a product with possibility economic exploitation. objective this work was present dynamics composting process in an processing plant municipality Montenegro, RS, Brazil, as well results chemical analyzes quantification humic substances contained leachate resulting from process. revealed that it has high levels (humic acids between 12.2 30.7%, fulvic 45.5%) significantly higher than those found literature (9%). Leachate characteristics desired preparation commercial use agriculture can be configured interesting extra income health enterprise.
 Keywords: waste; composting; substances; agriculture.