OCENA ODDZIAŁYWANIA SKŁADOWISKA ODPADÓW KOMUNALNYCH W TYCHACH NA ŚRODOWISKO WÓD PODZIEMNYCH W ŚWIETLE BADAŃ MODELOWYCH

Abstract

IMPACT ASSESSMENT OF MUNICIPAL LANDFILL IN TYCHY ON GROUNDWATER ENVIRONMENT – MODELLING STUDYThe municipal landfill in Tychy-Urbanowice consists of three sites, the old one closed in 1994 and two others in use. The old part, against two other ones, is not lined and, as a result, the landfill leachate deteriorates the quality of groundwater. The objective of the modelling study was to apply 3D transport modelling for assessment and prediction of municipal landfill impact within the Quaternary aquifer. The transient transport models using FeFlow software have been constructed. For single-species transport model boron has been chosen. The results indicate that the contamination plume of boron has been moved downstream from the old landfill towards the Gostynia River. The plume is currently about 750 meters long and 250 meters wide. The highest concentration of boron is 13 mg/l under the old landfill and, as a result of dispersion, concentration decreases to 1–2 mg/l at the distance of 300 meters downwards from the old landfill, what was confirmed by both model simulation and monitoring network observation. The predictions made on the model show that contamination plume still spreads and higher level concentration of boron will be observed downstream from the old landfill site.