Behaviour and Impact of Cow Slurry Beneath a Storage Lagoon: 1. Groundwater Contamination 1975–1982

摘要: The chemical and biological composition of groundwater sampled from a 76 m deep borehole situated 80 an unlined, earth-banked lagoon excavated in Upper Chalk continuously used to store liquid cow manure was regularly monitored August 1975 January 1982 for signs pollution. became self-sealing 3 months after the start filling 1975, but further enlarged re-filled autumn 1976, emptied by dragline September 1978 1980. No significant changes were detected period December 1978. In 1979, numbers Escherichia coli large, rapid increase concentrations ammonium-nitrogen (NH4-N), phosphorus (P), potassium (K), sodium (Na), chloride (Cl) sulphate (SO4) groundwater. Nutrient fluctuated at elevated levels throughout 1979 decreased during Additional bacterial (NH4-N, P K) contamination recorded 1981 subsequent months. considered have occurred as result fissure flow through unsaturated zone following repeated disruption layer emptying results indicate that slurry storage lagoons need be carefully managed avoid pollution aquifers.