The effect of artificial aeration on the hydraulics of constructed wetlands

Parker, Benjamin (2013) The effect of artificial aeration on the hydraulics of constructed wetlands. BEng dissertation, University of Portsmouth.

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    This paper presents an experimental approach to evaluate the effect of artificial aeration on sub surface flow constructed wetlands. Measurements were taken for hydraulic conductivity, accumulated solids as well as various pollutants removal tests on a single full scale wetland at a Southern water site in Petersfield. These measurements were taken in order to gain an understanding of the mechanisms that affect the hydraulic performance of constructed wetlands. Hydraulic conductivity and accumulated solids were measured at 6 sites across the reed bed as well as the outlet. The sites included three inlets and three additional points across the bed with results being recorded 4 times over a 7 week period. Variations of hydraulic conductivity were observed between the inlets and the other points across the bed. Values of hydraulic conductivity ranged from 60 to 110 m/d at the inlets and values of between 130 to 210 m/d at the other points across the reed bed. Measurements for SS and VSS did not display any direct relationship with hydraulic conductivity. However a relationship between the ratio of VSS:SS and hydraulic conductivity was observed.

    An interesting trend that was observed was the increase of TSS as length along the reed bed increased. This suggests that aeration may not be the major influence on hydraulic conductivity and the movement of TSS through the reed bed may be the key to understanding the variation in hydraulic conductivity across the bed. The methods presented in this paper are simple and cost effective but can still offer an insight into the hydraulics of constructed wetlands.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Alice Bentley
    Date Deposited: 27 Feb 2014 12:19
    Last Modified: 28 Jan 2015 12:34

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