The examined period is characterized by small floristic variety and well advanced eutrophication process. By the phytoplankton qualitative analysis it has been noted the domination of Bacillariophyta algal division. The values of density on phytoplankton population and their biomass show the domination of bluegreen algae, before each other, that of the species Gomphosphaeria lacustris Chod. As the consequence of the eutrophication, these algae develop intensively, up to the degree of water blossoming. The very high concentrations of the primary and secondary nutrients have also been noted. The trophic status of the reservoir on the basis of OECD classification can be defined as eutrophic.

Dutch classification system for sediment pollution was applied at the Begej canal in Serbia (Serbia and Montenegro). The method used calculates the class of the sediment on the basis of the sediment composition, organic matter fraction and mineral clay fraction as well as data on ecological risks. Results obtained showed that sediment is heavily polluted and urgent remediation is necessary. The contamination consists of heavy metals, especially cadmium, copper and chromium (class 4). Regarding organic micropollutants some high levels of PCB's and organochlorine pesticides like DDT/DDD/DDE were found (class 3).

This paper presents general characteristics of water source Mareza, which has been used for water supply of the town of Podgorica, as well as potential risks that can affect water quality of this source. Measures for the source protection in order to maintain existing high quality of the source water are presented.

The paper presents the results of a pilot study of the combined process of ozonation and filtration through biologically activated carbon to remove residual organic matter in the process of drinking water production. It was established that the application of these procedures resulted in the removal in average of 74% PB, 50% TOC, 60% of total aldehydes, and 54% PFTHM, the result being a consequence of the adsorption/biosorption processes involved.

In this study, the possibility of application of agricultural lignocellulosic waste materials as adsorbents of different heavy metals ions from water was investigated. As adsorbents, wastes of widely cultivated plant cultures in our country were used. They were wheat straw, cornstalk, corn cob and soybean straw. These materials were showed as good adsorbents in most cases. But, leaching of organic matters from them during adsorption was observed. It was unfavourable. Because of that, adsorbents washed and dried. After that leaching of organic matters was significantly decreased, but also adsorption efficiencies slightly decreased, too.

Until recently, the wetlands have been destroyed as worthless areas due to the ignorance of their role in the processes that take place in the stream corridors. The paper presents an overview of their roles in the hydrologic cycle, biogeochemical cycling and supporting biodiversity. In addition, their significance in the stream corridor preservation, protection and restoration is discussed. Both, the knowledge of their role in and their significance for the stream corridors, is essential for preventing further imprudent destruction thereof, successful planning and preparation of the stream restoration projects, and the recognition of their possible usage in satisfying human needs.

During 2003 the referent monitoring of chemical quality of surface waters and sediments in Vojvodina (Serbia, Serbia and Montenegro) was conducted as a supplement to the regular monitoring program in Vojvodina. The aim of the study was to establish the chemical quality of surface waters and sediments. It is concluded that the water quality satisfies the criteria of the 1st/2nd class according to our legislation, with the exception of a few monitoring stations which showed a slight contamination with mineral oils and polycyclic aromatic hydrocarbons (PAHs)/ With regard to contamination of sediments with PAHs, organochlorine pesticides and polychlorinated biphenyls (PCBs) the Begej-Klek monitoring station may be considered as potentially problematic as the reference values according to Dutch legislation were exceeded for three classes of pollutants.

One-year monitoring program was organized with the aim to assess the quality of sediment and water in these Vojvodina watercourses: the Begej, the Sava, the Botos, the Tisza, the Tamis, the Danube and the Danube-Tisza-Danube (DTD) Canal regarding metal content (Cr, Cd, Cu, Ni, Pb, Zn, Hg) in them. Water was the 1st/2nd class by MPL of national requirements, except occasionally for the copper concentration on some locations. The highest concentrations of zinc, cadmium, chromium, copper and mercury were detected in the Begej sediment. Maximum nickel concentration was in the Sava sediment, and for lead in the Danube sediment.

Water quality studies of the Danube river in Belgrade region (Serbia and Montenegro) were performed at five locations, in June and September, 2003. Results of the qualitative, quantitative and saprobiological analyses of plankton and macrozoobenthic communities were used for the water quality assessment and the categorization of the watercourse examined. The bioindicator analysis points to the presence of mild organic pollution, water quality varying between the 2nd and 3rd class.

The paper presents the results of the water quality studies of the Sava river in Belgrade region (Serbia and Montenegro). The investigations were performed in June and September, 2003. The sampling area covered five locations along the 61.5 km of the river course. Studies included the qualitative, quantitative and saprobiological investigations of plankton and macrozoobenthic communities. The bioindicator analysis points to the presence of mild organic pollution indicating thus 2nd and 3rd-2nd class of water quality.