Phosphorus Retention in a Constructed Wetland System used to Treat Dairy Wastewater

A. O'Neill, R.H. Foy, Debra Phillips

    Research output: Contribution to journalArticlepeer-review

    26 Citations (Scopus)


    The aim of this study was to develop an input/output mass balance to predict phosphorus retention in a five pond constructed wetland system (CWS) at Greenmount Farm, County Antrim, Northern Ireland. The mass balance was created using 14-months of flow data collected at inflow and outflow points on a weekly basis. Balance outputs were correlated with meteorological parameters, such as daily air temperature and hydrological flow, recorded daily onsite. The mass balance showed that phosphorus retention within the system exceeded phosphorus release, illustrating the success of constructed wetland systems to remove nutrients from agricultural effluent from a dairy farm. Pond 5 showed the greatest relative retention of 86%. Comparison of retention and mean air temperature highlighted a striking difference in trends between up-gradient and down-gradient ponds, with Ponds 1 and 2 displaying a positive quadratic relationship and ponds 3 through 5 displaying a negative quadratic relationship.
    Original languageEnglish
    Pages (from-to)5024-5031
    Number of pages8
    JournalBioresource Technology
    Issue number8
    Publication statusPublished - Apr 2011

    ASJC Scopus subject areas

    • Bioengineering
    • Environmental Engineering
    • Waste Management and Disposal


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