The Danube, Tisa and Maros rivers are the most prominent environmental heritage of the cross-border region. Hence, both the Hungarian and Serbian sides are interested in the quality of these surface waters, as the drinking water supply systems are based exclusively on local ground waters. The major problems are high content of organic matter (humic acids, phenols, etc.) and lack of adequate water treatment, as ground water cannot often be used without prior treatment. In view of the low level of environmental protection, along with the insufficiently effective wastewater treatment and uncontrolled pollution emission, unacceptable from the viewpoint of preserving natural and cultural heritage, the objective of this project is to develop simple and economic methods for cleaning and grooming waters with high content of organic compounds and emerging micro pollutants, to improve their chemical and microbiological parameters, as well as to develop simple biological and chemical procedures for their characterization and removal. Achievements: Simple and economic methods for cleaning and grooming waters with high content of organic compounds and emerging micro pollutants, to improve their chemical and microbiological parameters, as well as simple biological and chemical procedures for their characterization and removal have been developed.