The paper deals with the results of the phytoplankton investigations carried out in the 7 localities along the Yugoslav section of the Tisza river in the period of 13 Februar - 3 March 2000, after accidental pollution with the cyanide and heavy metals. Although certain decrease in the density of the phytoplankton and variation in the qualitative and quantitative composition were recorded, there are no significant differences in comparison with the data before accident. The short-term and possible long-term consequences were recognized, having in mind ability of algae to accumulate pollutants into their cells, and that algae are the first link on food chains. Since the content of pollutants increases with every next member in the chain, it is easy to assume cumulative effect of the all previous members.

Aerobic bioremediation of oil contaminated soil was investigated on laboratory-scale for purpose of pilot-plant installation. Mineral oil was analysed using IR spectroscopy. Sediment was qualitative analysed on GC/MS. Research also included microbiological analysis.

The photocatalytic degradation of the insecticide fenitrothion was performed in the water solution in the presence of TiO2 by UV illumination. NMR spectrocopy showed that the decomposition of the initial substrate and all intermediates formed to the mineralization end products is completed in 66.3 hours. This fact was used to establish the possible mechanisms of the degradation process. The obtained results show that this method may have an important application in the removal of fenitrothion from water.

During complex studies of phytoplankton, the role of particular phytoplankton groups was examined, as one of important indicators of eutrophic processes in the Bay of Boka Kotorska (Adriatic sea, Montenegro (Yugoslavia)). Throughout summer 1999, investigations have been performed at representative locations (Kotor, Tivat and Hercegnovi bays) at the depths of 0, 5, 10 and 20 m. Maximal values of microphytoplankton were found in Kotor Bay in July (2.1 x 10**6 cells/cubic dm). In Tivat Bay, maximal values of microphytoplankton were found in June, although they were ten times lower (2.4 x 10**5 cells/cubic dm). In the Bay of Hercegnovi, mean values were lower, while maximal quantity of microphytoplankton was found in August (2.6 x 10**3 cells/cubic dm). In the Boka Kotorska Bay, the maximal percentage of 95% of the group Bacillariophyceae was found in the most productive surface layers at the depths of 0 and 5 m. The impact of eutrophication was the most visible in the Kotor Bay. It decreased towards the open sea. Diatoms populations (Bacillariophyceae) were dominant in the Bay, while the participations of other groups is insignificant. Consequently, it means that Bacillariophyceae are the most adapted group to the eutrophic conditions of the Boka Kotorska Bay.

The purpose of this work is finding a solution to the brewery wastewater refining problem. As a result, a preliminary treatment for wastewater emission in the town sewage is given. For huge ecological recipients demands, a possibility of the complete refining is presented. After giving the analysis, conceptions for solutions to recycling plants are displayed. The contribution of this paper is in solving the problem of the treatment of the wastewater generated during technological process of beer production and is based on several years investigation.

In the period from May to August in 1996, the samples for hydro-biological and inchthyological from the following localities were collected: the Klaicka river, the Radevacka river, the Sumanka river and the Lipovacka river (Serbia, Yugoslavia). The water quality was determined n the basis of bioindicator values and the abundance of particular species of phytoplankton, zooplankton, bottom fauna and fish community. According to the portion of plankton organisms, the saprobic index for the Klaicka river was between 2.01 and 2.57, for the Radevacka river it was between 2.83 and 2.93, for the Sumanka river between 2.59-2.78 and for the Lipovacka river this index had a value between 2.72 and 2.83. Among the botton fauna, 10 zoobenthic groups were determined. The highest frequency and abundance was registered in the groups of Ephemeroptera and Trichoptera, and the water quality is between oligo- o-beta-mesosaprobic (the Lipovacka river), -beta-mesosaprobic (the Klaicka river), o-beta to alfa-mesosaprobic (the Radevacka river) and beta to alfa-mesosaprobic (the Sumanka river). The ichthyofauna of the Klaicka and Sumanka rivers include the species like southern barbel, chub and spirlin. Basing on the fact, the water quality was determined as beta-mesosaprobic (1.65). The majority of results point to the satisfactory biological quality of water in this hydroecosystem, which is, therefore, considered to be one of the potential sources of water supply.

In this work, we were investigated level and source of trace elements in industrial and sea waters in Bokakotorska Bay (Adriatic sea, Montenegro, Yugoslavia). The ranges concentration in (microgram/cubic dm) in seawater are as follows: Hg (0.1-0.4); As (0.1-0.9); Pb (2.3-10.0); Zn (3.0-12.0); Cu (2.3-8.4); Cr (0.8-3.0); Cd (0.1-1.0); Ni (0.9-3.0); Mn (0.2-0.5). The average levels of trace elements in the samples collected from industrial effluents of factory ILK were 110 - 16500 times higher than concentrations of trace elements in other industrial effluents.

The subject of the paper is eco-technological procedure of the treatment of the sludge generated during conventional purification (Cn(-) oxidation, Cr(6+) reduction, chemical precipitation of the other metals) of the wastewater from galvanic process. The detailed analysis of the waste sludge with the determination of high flow (the water eluate) and low flow (HNO3-eluate) fraction as Cu(2+), Cr(3+), Cd(2+), Ni(2+), Pb(2+), Zn(2+). The point of the paper is the treatment of the sludge as the dangerous waste into useful product glass-ceramics, with eliminating of the generation of the dangerous and harmful materials in environment. Experimental investigation has achieved the point and approved that with this procedure it is possible to transform chemical active matters (Cu(2+), Cr(3+), Cd(2+), Ni(2+), Pb(2+), Zn(2+)) using the phase and chemical transformation into very stable structure where the pollutants can not be activated even under critical conditions as high temperature, influence of acids and alkalines, etc.

The analysis of the phytoplakton and phytoperiphyton communities in the Palic lake (Serbia, Yugoslavia), has been performed with aim the water quality evalution. The determining and following proportional presence of phytoplankton were in the fourth sector of lake during 1998, 1999, and 2000. During the period of investigation, the phytoplankton community was characterized by forms of Chlorophyta, Cyanophyta, Euglenophyta and Bacillariophyta. During the investigation it was perceived the change in proportional participation in the presence of the four alga group mentioned above. The most representative percent was the Chlorophyta group, with values from 44.4%, to 54.7%. The other phytoplakton group has less values of percentage in the values.