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Harmful substances like heavy metals are very important group of pollutants which can cause considerable detriment to the environment if they exceed certain concentrations. The aim of this study is to define the concentrations of Cu, Fe, Mn, Pb, As, Zn, Cd and Ni in the waters of the Rivers Pirdopska and Medetska, tributaries of the Topolnitsa River, Bulgaria for the period 2015-2019. In the analysis of the heavy metal content Water Quality Index (Canada), as well as statistical and graphical methods were applied....

The priorities in the policy of the energy sector of the Republic of Bulgaria after 1989 are in harmony with the requirements of the European directives and market mechanisms. An important aspect is the policy to promote the use of renewable energy sources (RES), which aims to achieve sustainable energy development and improve environmental performance. It is also related to the implementation of the commitments made by the Republic of Bulgaria regarding the United Nations Framework Convention on Climate Change (1...