A contemporary biostability assessment of raw and treated water requires determination of biodegradable organic matter fraction responsible for bacterial growth. BDOC test allows monitoring of bacterial growth by assaying chemical changes in the test-water and thereby determine the content of biodegradable dissolved organic carbon (BDOC). The aim of this study was to optimize the required period for performance of BDOC tests, and to examine the use effectiveness of different biofilm carrier. The results indicate that the BDOC test with sand-inoculation is more effective compared to the anthracite, and recommendations for monitoring of biodegradation process are a period of 3-5 days.

Institute for Development of Water Resources Jaroslav Černi and the Republc Hydrometeorological Service of Serbia carried out detailed processing and analysis of available hydrometeorological data within the amendments of the draft for Water Management Master Plan of Serbia in 2009. In this particular case, the most important characteristics of time series of hydrological and meteorological parameters on key sections of hydrological and meteorological stations, their conventional processing and analysis was completed and updated. The final goal of amendments of the draft of Water Management Master Plan is to provide elements to define the balance of available water resources in the territory of the Republic of Serbia, necessary for defining the strategy of water use and defining the conditions for integrated and rational management. This paper presents the most important elements of water balance using modern GIS technology.

Microbiological monitoring of river water quality is obligatory for use-related aspects such as drinking water production, irrigation and recreation. Assessment of the microbiological quality of water and sediment at the Velika Morava River was performed at five sites, during 2010 and 2011. By applying standard procedures for sanitary correctness and organic load assessment, total of 16 parameters were analyzed. Results of analysis indicated that microbiological water quality of the Velika Morava River is unsatisfactory.

In order to collect information about the presence of priority and other substances whose quality standards are defined by Directive 2008/105/EC, the water and sediment quality monitoring was carried out in 6 sampling locations in four rivers and 14 sampling locations in protected areas in AP Vojvodina. The waters of the Carska Wetland, Ludas Lake and Danube River exceeded the quality standards for pentachlorobenzene, while the quality standard for cadmium was only exceeded in Carska Wetland. The priority substances detected in the sediment were lead, nickel, mercury, trifluralin, isomers of hexachlorocyclohexane (HCH), pentachlorobenzene, hexachlorobenzene, 4-octylphenol, naphthalene, anthracene, fluoranthene, benzo(b)-and benzo(k)-flouranthene, benzo(g,h,i)-perylene and indeno(1,2,3-cd)pyrene.

Since the year 2004 the water reservoir Kraljevac has been recognized as a Special nature reserve. Investigations of the water reservoir were done during the autumn (November) of 2009 at three localities. on the basis of the results obtained in this study Kraljevac reservoir water is moderately polluted and correspond to classes 2nd and 2nd-3rd based on physical, chemical, microbiological and hydrobiological parameters.

Due to development in the science, especially in the area of biodegradation, it becomes clear that different species of aerobic and anaerobic bacteria are indigenous in the ground water. Due to changed condition in ground water, like infiltration of petroleum hydrocarbons, indigenous bacteria start to react and are involved in different processes of natural biodegradation. Also, great contribution of understanding how bacteria functionating in ground water is given from the field of well regeneration due to consequences of biofouling and biologically induced corrosion. In this article several natural processes related to bacteria are analyzed and its importance and distribution in ground water is shown.

This paper presents results of measuring the contents of certain bio-indicators in samples of digestive gland and lung of mussels (Mytilus galloprovincialis). The results were obtained in the framework of the Program for monitoring ecological status in Montenegro during the 2009 and 2010 year. Biomonitoring program was conducted in accordance with the LBS Protocol (Protocol on the Protection of the Mediterranean Sea against pollution from land-based sources and land activities) and the criteria MED POL Programme (Mediterranean Pollution Control), which is compliant with the requirements of the European Environment Agency (EEA) and has established a system of reporting and data exchange with the EEA. The program includes the analysis of biomarkers in Mytilus galloprovincialis (Lamarc, 1819) (mussels), and dynamic sampling is 2 times a year (March and September). In order to assess the spatial distribution and temporal trends of pollution, followed by the response of various biomarkers presented at two positions in the coastal waters of Montenegro (Dobrota and Bijela) and three positions in Slovenia (bays Piran, Strunjan and Koper). Biomarker responses showed no difference between the positions of the different ecological status.

Marine sediments naturally contain arsenic at low concentrations. Increased concentrations could come from natural sources such as volcanic activity, hydrothermal vents and others, but they are usually the result of human activities. The largest number of arsenic compounds possesses toxic properties and due to this arsenic is classified as hazardous substances to the environment and biological species. Therefore, arsenic and its compounds are subject to chemical and biological analysis of sediments. Based on the analysis of sediment samples for arsenic content, this paper presents arsenic spatial distribution in the investigated area of the South-East Adriatic.

Monitoring of phytobenthos was performed seasonally, on five locations of Montenegrin coast for the purpose of environmental monitoring. Locations with highest biodiversity were Budva and Stari Ulcinj, while the poorest one was Kotor. Regression of seagrass Posidonia oceanica was observed on the Krasici location.

In this paper the size-frequency distribution by sexes and for the whole sample of Norway lobster Nephrops norvegicus (Linnaeus, 1758) as well as the sex raio have been analyzed. Representative subsamples were collected during the four sesonally trawl surveys (summer 2009 – spring 2010) at depths from 330 to 350 m. Total number of analyzed individuals was 303. The carapace length (CL) of the all individuals ranged from 20 to 58mm while the female carapace length-range was 20-56mm and 22-58mm for males. in all seasons males were larger than females and highly represented in the catch in bigger size classes. The overall sex ratio during the investigation period was in favor of females (1.3:1).