Journal
ECOLOGICAL ENGINEERING
Volume 24, Issue 3, Pages 221-234Publisher
ELSEVIER
DOI: 10.1016/j.ecoleng.2004.11.010
Keywords
eutrophication; agriculture; farmyard dirty water; integrated constructed wetlands; Ireland
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Water pollution by agriculture can include inappropriately managed dairy farmyard dirty water. In Ireland, dairy farmyard dirty water includes farmyard runoff, parlour washings, and silage/farmyard manure effluents. The objectives of this study were to determine (i) the quality and quantity of dirty water generated at a farm-scale and (ii) the seasonal effectiveness of aconstructed wetland to treat farmyard dirty water. The wetland system was 4800 m(2) in area and treated dirty water from a 42-cow organic dairy unit with an open yard area of 2031 m(2). Monthly dirty water inflow rate to the wetland ranged between 3.6 and 18.5 m(3) d(-1). Farmyard dirty water accounted for 27% of hydrological inputs to the wetland, whereas rainfall on wetland, along with wetland bank inflows accounted for 45 and 28%, respectively. Farmyard dirty water quality and quantity did not vary with season. Yearly mass loads discharged to the wetland were 47 +/- 10 kg yr(-1) of soluble reactive phosphor-us (SRP), 128 +/- 35 kg yr(-1) of NH4+, 5484 +/- 1433 kg yr(-1) of organic material as measured by five-day biological oxygen demand (BOD5), and 1570 +/- 465 kg yr(-1) of total suspended solids (TSS). Phosphorus retention by the wetland varied with season (5-84%) with least amounts being retained during winter. (c) 2004 Elsevier B.V. All rights reserved.
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