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http://dx.doi.org/10.17663/JWR.2020.22.3.171

An Investigation into the Release of Chemical Oxygen Demand in Organic Filter Media  

Guerra, Heidi B. (Department of Environmental Engineering, Hanseo University)
Kim, Youngchul (Department of Environmental Engineering, Hanseo University)
Publication Information
Journal of Wetlands Research / v.22, no.3, 2020 , pp. 171-177 More about this Journal
Abstract
To improve the nitrogen reduction capability of stormwater treatment systems subjected to intermittent saturation, organic materials are often added as filter media. However, these materials can be an additional source of organic carbon and increase the chemical oxygen demand (COD) in the outflow. In this study, different types of organic filter media were subjected to a batch leaching test to observe and quantify the release of COD. Results reveal that the initial pH of the tap water used for soaking which is 7.5-7.7 is conducive to the release of organics from the media to the leachate. The highest amount of COD released was observed in yard clippings and woodchip followed by compost and bark mulch. The leaching of organics also increased as the size of the media decreases due to higher surface area per volume. In addition, empirical regression analysis predicted that COD from these organic media will be exhausted from the material in 3-5 months to up to 26 months depending on the type of media. The results of this study can serve as a guide in estimating the potential release of COD in organic media in order to ensure their safe application in stormwater treatment facilities.
Keywords
COD; filter media; leaching; organic; stormwater;
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