Qualitative Studies of Selected Types of Composts

More and more waste is being generated in the world. One form of waste processing is the composting process. This work aims to study the morphological composition of selected composts to determine the amounts of the various frac-tions contained therein. In the present work, four types of composts are presented to study their morphological composi-tion. Composted grass, backyard compost, soil improver formed after composting green waste, and stabiliser – waste formed due to mechanical-biological processing of municipal waste taken from the Municipal Waste Mechanical-Biological Treatment Facility – were studied successively. Fifty samples of 2 kilograms each were taken from each group of composts, respectively. Each sample was divided into seven fractions: organic waste, plastics, ceramics, paper and cardboard, glass, metal and others. After analysis, it can be concluded that it is very difficult to obtain homogeneous compost due to the heterogeneity of the raw material. The results are accurately presented in tables with the distinction of the different fractions. It was found that mowed grass contained the most organic matter, while stabiliser contained the least. The least amount of plastic was found in backyard compost, and the most in stabiliser.