摘要：The Danube is an international river and, as such, a subject to a special level of protection, assuming identical water quality at entry point into any country and exit from it. Anthropogenic activities greatly alter the water quality of the Danube, physico-chemicaly and biologically. Water quality monitoring is therefore a priority activity, in order to assess arising environmental risks and act accordingly. Floating catering facilities (i.e. raft restaurants) on the Danube in Serbia may compromise physical, chemical and biological conditions of the river water. Those use septic tanks, emptied directly into the river, without treatment of any kind. The composition of this waste corresponds to the category of municipal waste, and as such is rich in organic matter at various stages of decomposition, as well as foecal bacteria, many of which are opportunistic pathogens. In order to examine the impact of such facilities on river water, micro-hydrolo-cation of raft restaurant “Noah's Ark” in Novi Sad was used, as a representative of the type, with the permission of the Management Board. The water was sampled in the vicinity, upstream and downstream, during normal operation, and during the discharge of its septic tank. Physical, chemical and bacteriological water quality parameters were evaluated. The results of the study show the possibility of the occurrence of ecological shock moments, related to the discharge of wastewater into the Danube, which are detectable in a range of changes in the oxygen regime to restructuring entire bacterio-biocoenotic communities in the surrounding water.
