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Mitigation of phosphorus, sediment and Escherichia coli losses in runoff from a dairy farm roadway
McDowell, R.W. Daly, Karen M. Fenton, Owen
McDowell, R.W.
Daly, Karen M.
Fenton, Owen
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2020-11-30
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McDowell RW, Daly K, Fenton O. Mitigation of phosphorus, sediment and Escherichia coli losses in runoff from a dairy farm roadway. Irish Journal of Agricultural and Food Research 2020;59(1):201-205; doi http://dx.doi.org/10.15212/ijafr-2020-0117
Abstract
Dairy cow deposits on farm roadways are a potential source of contaminants entering streams. Phosphorus (P),
suspended sediment (SS) and Escherichia coli (E. coli) loads in 18 runoff events over 12 mo from two-halves of a
section of dairy farm roadway that spilt into an adjacent P-impacted stream were measured. The runoff from one half
was untreated while the other half was directed through a filter of steel melter slag [termed aluminium chlorohydrate
(ACH)-altered slag] sprayed with 1% ACH solution to improve P sorption capacity. An uncertainty analysis was
conducted to ascertain potential loads of P lost from roadways considering variation in deposit weight, number and
P content. Over the monitoring period, the total load decreased P (92%), SS (98%) and E. coli (76%) from the ACHaltered
slag roadway compared to the control. However, uncertainty analysis showed that the amount of dung-P
deposited on the roadway could be 10-fold greater.