Influence of slurry on organic matter fluctuation in groundwater

Abstract

The paper analyses the data on the change of the groundvvater organic matter content in the observed boreholes, eąuiped in light soils fertilized with the slurry from pig-breeding enterprise. The investigations aimed to determine the influence of the fields fertilized vvith the slurry from pig-breeding enterprise on the migration of organic matter in the groundvvater. The work involved natūrai investigations, analysis of the water samples vvas carried out follovving the Unified Water Quality Research methods, approved by ministry of Environment. The investigations established that meteorological conditions and groundvvater level had some influence on water level fluctuation in the boreholes. The higher the air temperature and the lovver the precipitation, the lower is the groundwater level in the boreholes. The fluctualions of the groundwater level in the boreholes 2 and 3 were bigger, because the groundwater level in these boreholes is eloser to the soil surface. Fluctuation of water levels influenced concentrations of organic matter: the eloser water level is to the soil surface, the higher COD and TOD concentrations were observed. The groundvvater flow direction had the influence on the higher hard oxidised organic matter content in the boreholes 1 and 4, because in these boreholes the groundvvater lies deeper than in the boreholes 2 and 3. The investigations established that the fields fertilized vvith slurry had insignifieant influence on the groundvvater ųuality: the dominant sectional water composition stayed the same as in the \vater that is naturally emerging in the nature.