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http://dx.doi.org/10.17663/JWR.2019.21.4.334

Effect of Unexpected Foaming Incident on Nitrogen Removal in a Vertical Subsurface Wetland  

Cheng, Jing (School of Environmental Science and Technology, Anhui Science and Technology University)
Guerra, Heidi B. (Department of Environmental Engineering, Hanseo University)
Kim, Youngchul (Department of Environmental Engineering, Hanseo University)
Publication Information
Journal of Wetlands Research / v.21, no.4, 2019 , pp. 334-343 More about this Journal
Abstract
A lab-scale vertical flow subsurface (VFS) wetland composed of three parallel columns with polypropylene synthetic fiber as main substrate was operated. Piggery stormwater diluted from swine excreta was fed to the wetland on the basis of three different hydraulic regimes or hydraulic retention time (HRT) of 2, 4, and 8 days with daily internal recirculation. Then, monitoring of common water quality parameters was carried out. Unexpectedly, an increase of effluent COD concentration accompanying the appearance of foams was observed during a distinct period in the wetland with HRT 2, 4, and 8 days, successively. Subsequently, a series of experiments was conducted to investigate the origin of the foams. Foams and the increase of COD concentration were found to be induced by the release of organic matter from the synthetic polypropylene fiber which was fed with piggery stormwater. Meanwhile, nitrogen removal was found to be enhanced during a period which overlapped the distinct foaming period signifying that foaming played two important functions in biological nitrogen removal. Foams which form rapidly and then burst easily could hold up and then release oxygen for nitrification. Foams which contain organic surfactants could serve as carbon sources for denitrification as well. Hence, nitrogen removal was enhanced during the foaming stage. After that, COD concentration decreased slowly to a level prior to the foaming stage, and nitrogen removal efficiency declined as well.
Keywords
Denitrifcation; Nitrification; Nitrogen Removal; Piggery stormwater; Subsurface wetland; Polypropylene Fiber;
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