Abstract
The paper presents the results of research on the environmental impact of sewage ponds serving the city of Kostanay (Kazakhstan). The scope of the research included the determination of basic quality parameters of raw and treated wastewater, an analysis of the chemical composition of groundwater in the vicinity of sewage ponds, and the analysis of the water quality of the Tobol River. The obtained results indicate that sewage from storage ponds, infiltrating into the ground, caused groundwater pollution in the area of about 100 km2 around the reservoirs. Due to the fact that the groundwater aquifer in the vicinity of sewage ponds feeds the Tobol River, it also affects water quality in the river, which does not meet the requirements for most of the analyzed parameters.
Highlights
The requirements for the rational use and protection of water resources and the prevention of their pollution are among the most important objectives of environmental protection and sustainable development policy [1,2]
The main sewage pond, which consists of Lakes Rybnoye and Mazarevo, was built in 1966 and has a total volume of 94.1 km3
Tobol River, in the profile fed with groundwater from the surroundings of sewage ponds
Summary
The requirements for the rational use and protection of water resources and the prevention of their pollution are among the most important objectives of environmental protection and sustainable development policy [1,2]. Accumulation of treated or pre-treated sewage in artificial or natural storage tanks as well as supplementing underground aquifers with sewage, and using them for various needs can be one of the ways of rational water management [3]. Sewage storage tanks can have an adverse effect on the environment. For this reason, the environmental impact of sewage ponds should be the subject of special attention both during the reconstruction and operation of existing treatment plants and at the design stage of new facilities [4].
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