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Deoxygenation rate coefficient in modeling the quality of urban rivers in Indonesia

This study investigates the use of the deoxygenation rate coefficient in modeling the urban river water quality in Indonesia. The method used in this study is data collection in the form of calculating the rate of deoxygenation carried out in rivers in several urban areas based on previous studies. This assessment includes the amount of deoxygenation rate, calculation, and determination method. Based on the studies conducted, the method recently used is laboratory treatment. Several studies have used an empirical formula proposed by Hydroscience to determine the deoxygenation rate. Most of the deoxygenation rate value determination used the Slope Method, but many also directly referenced typical values without performing analysis in the laboratory. The deoxygenation rate for urban rivers in Indonesia, which has been based on various determination methods, varies from 0.001 per day to more than 1.00 per day. Low deoxygenation rates are often found at sampling sites. This can be caused by pollutants that inhibit the process of decomposing organic matter in river waters. The comparison between the use of laboratory tests and empirical formulas shows a vast difference.