This study was performed to investigate the influence of the ozonation process on natural organic matter (NOM) and trihalomethane, haloacetonitrile and chloropicrin precursors in groundwater. The largest reduction in dissolved organic carbon, DOC (up to 25%) and UV 254 values (up to 69%) was achieved using 3 mg O3/mg DOC. Reducing the total organic matter resulted in a reduction of trihalomethanes precursors to 194 micro g/L. On the other hand, when it comes to the precursors of the high priority nitrogenous disinfection by-products, the oxidation of NOM by ozone and the resulting increase in organic matter with a low molecular lead to an increase in the haloacetonitrile precursors compared to the raw water and the formation of chloropicrin precursors.

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.

The paper deals with determination of the economic elements of water management, which reflect the specific foundations, processes, principles and goals that are determined by the water policy. In terms of services, this represents the economic valorization of the foundations in manageable and unmanageable technical and natural systems, in which processes take place to bring water to a certain target quantity and quality, as well as provide safety against water in time and space. The use of, and protection against water, are under the pressures and influence of natural climatic and soil factors, the balance condition of surface and groundwater, and in particular human activities and demands for the characteristics of water in a water body, water area and in the river basin. These factors influence the demand for services, which also depends on the available domestic product, its volume of use, tastes and preferences. The offer consists of services for a particular quantity and quality of the available water, and for a certain degree of safety from the harmful effects of water, which are achieved by the employees of the functional facilities and systems. Together with the activities of the association, population and public services, the use of, and protection against water make up the totality of water management. It requires a decision process in all of the functions involved in planning, organization, management and control. Water management is identified with the water policy and activity, although there is a difference between them. The first is represented by a decision-making system in planning, organization, management and control, while the second is represented by the activity systems of government in the field of protection against water, as well as the protection and use of water. The activity consist of certain services which are performed by the employees of the companies, through the provision and performance of water management services in various time and space, in accordance with the offer and the demands of the users.

Land reclamation activity, such as irrigation, requires monitoring in order to create conditions for a stable and highly productive crop production. It is necessary to monitor the use of water for irrigation in order to prevent or mitigate the consequences of unfavorable, poor quality water on soil irrigation, cultivated crops or equipment. In the province of Vojvodina, the Detailed Channel Network has a great potential. The specificities of this source of water for irrigation need to be observed in the usability of water. In 2010 the sampling was conducted in selected localities in middle Backa and Banat. The results indicate that water quality does not always meet the requirements proposed by the applied classification. What is particularly unfavorable is the fact that the worst quality was registered during the survey conducted at the beginning of the irrigation season on all sites.

The research of benthic fauna was done in part of the River Temstica, the right tributary of Nisava. Sampling was conducted on four sites, between 10 and 18 July 2010. Quantitative and qualitative analysis revealed the presence of eight groups of macroinvertebrates. The most frequent groups were Diptera, Ephemeroptera, Plecoptera, Trichoptera. Lower presence was shown by the groups of Coleoptera, Chironomidae, Turbellaria, Hydracarina. The greatest species diversity was characterized by order Trichoptera, while the largest number of individuals was characterized by order Diptera. There has been stated a 10 new taxa for this aquifer, with a new taxonomic group – Hydracarina. It is necessary to conduct further research of this river, with a need to analyze more samples from several locations (to conduct a research of the entire river, including the river mouth), and through the annual seasonal dynamics.

The aim of this work was to determine the bacteriological status of water catchment, basin, which is used for water supply of the town of Krusevac, as well as the distribution of present bacteria morphotypes. The total count of bacteria ranged from 1.35x10**5/ml to 2.09x10**7/ml. The number of aerobic heterotrophs ranged from 415 CFU/ml to 64,500 CFU/ml. The differentiation of bacteria in three morphotypes (rods, cocci and curved) was made. Representation of rods ranged from 40.05% to 78.71%, cocci from 4.39% to 60.88% and curved from 1.54% to 17.20%. Seasonal and vertical distribution of morphotypes showed increased presence of rods and curved forms in terms of increased bacteriological load of water, while the presence of cocci increased in conditions of cleaner water.

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.

Results of phytoplankton investigations that were performed in May, July, August and October 2010 are presented in this paper. The investigated areas are in Boka Kotorska Bay on four locations: Kotor Bay-IBM, Tivat Bay, Hercegnovi Bay-two positions and one position on the open sea – Mamula. In this area the influence of the open sea and the land are expressed to the phytoplankton community. As a consequence of that quantities of phytoplankton are lower in the outer part and higher in the inner part. Diatoms are the most dominant species, which is very frequent in the eutrophic area.

The concentration of trace metals (Pb, Cd, As and Hg) were measured in sea water and sediments in the coastline of the Montenegro. The obtained results of trace metals in sea water were compared with those found in the sediment. Sampling was performed in the fall of 2005 and spring 2006 at five locations in the Montenegrin coastline, Sveti Stasije, Herceg Novi, Budva, Bar and Rt Djeran which present different levels and sources of human impact. The heavy metals analyses in seawater and sediment of the Montenegrin coastline identified to be contaminated with lead the harbor Bar and Sv. Stasije, with arsenic Rt Djeran, with mercury the harbor Bar and Herceg Novi and with cadmium Herceg Novi.

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.