LAND IRRIGATION
In many countries, land irrigation remains one of
the best disposal routes for slaughterhouse wastewater.
The required land area is usually determined
by the nitrogen loading, provided that there are reasonable evapo-transpiration rates and good
phosphorus adsorption by soil occurs. As nitrate,
nitrogen is readily mobile in soils and may therefore
leach into groundwater if loading rates are too high,
leading to contamination. This is widespread in
Europe and has occurred in several places in Australia
(Bowmer & Laut, 1992) and New Zealand
(Keeley &Quin, 1979). Grazing of irrigated land has
been found to increase the rate of nitrate leaching,
since animals recycle 90% of ingested nitrogen to
soils (Cooper & Russell, 1988). In highly permeable
soils, phosphorus contamination of groundwater has
also been observed (Bowmer & Laut, 1992).
LAND IRRIGATIONIn many countries, land irrigation remains one ofthe best disposal routes for slaughterhouse wastewater.The required land area is usually determinedby the nitrogen loading, provided that there are reasonable evapo-transpiration rates and goodphosphorus adsorption by soil occurs. As nitrate,nitrogen is readily mobile in soils and may thereforeleach into groundwater if loading rates are too high,leading to contamination. This is widespread inEurope and has occurred in several places in Australia(Bowmer & Laut, 1992) and New Zealand(Keeley &Quin, 1979). Grazing of irrigated land hasbeen found to increase the rate of nitrate leaching,since animals recycle 90% of ingested nitrogen tosoils (Cooper & Russell, 1988). In highly permeablesoils, phosphorus contamination of groundwater hasalso been observed (Bowmer & Laut, 1992).
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