Changes in water quality in the lakes along Colentina River under the influence of the residential areas in Bucharest

摘要

Water represents an important receiver of the environmental problems generated by human settlements, being the environmental component which transfers many of the environmental externalities (wastewaters, waste, heat, various substances),In Bucharest, an essential part of the urban ecosystem is represented by the lakes along the Colentina River, which occupy 3.25% of the city surface and have a high importance in flood protection, recreation, improvement of environmental quality and receiving some of the city's problems. To assess changes in lakes water quality on the Colentina River it was organized a network formed by 33 monitoring points situated on 9 lakes. The monitored indicators were physical (temperature, conductivity, turbidity, transparency, pH), oxygen indicators (dissolved oxygen, chemical oxygen demand) and nutrients related (ammonium, nitrates, nitrites). The results were correlated with the characteristics of the residential areas situated in the lakes proximity (typology, wastewater management). There was noted a degradation in the water quality for the lakes which have in the shore areas individual residential and an improvement when the shores are covered by green spaces, collective residential, industrial areas, and even open fields. Degradation of water quality means an increased risk of eutrophication and thus a decrease in the value of its use in various urban purposes. Therefore, to implement the Water Framework Directive objectives and to improve the quality of life in the peripheral areas of Bucharest, situated along the lakes of Colentina River, is necessary to increase the sewage network coverage and to limit the uncontrolled waste disposal.