Investigation of Water Quality in Kozlu Creek (Zonguldak)

Today, the consumption of water is increasing day by day due to population. This increase of demand for water leads to an uncontrolled use of water supplies. Generally, in underdeveloped and developing countries, wastewater is discharged directly to receiving environments without treatment. This situation causes a decrease in the quality of these water supplies and restricts the benefits of streams. In this paper, we present the first extensive study on the quality of water of Kozlu Creek in Zonguldak. To determine the quality of the stream's water, we have collected water samples from 6 different locations on the creek, on two separate dates in June and December of 2017. These samples have been tested to determine their levels of Chemical Oxygen Demand, Biological Oxygen Demand, Total Suspended Solids, pH, Total Kjeldahl Nitrogen, phosphorus, conductivity, oil and grease content. We used Geographical Information Systems to create thematic maps that demonstrate the level of pollution of water in terms of Chemical Oxygen Demand and Total Suspended Solids parameters. As a result of the analyzes, it was found that the water quality in Kozlu Creek was in the 4th class according to the Regulation on Surface Water Quality.