Acta Hydrochimica Et Hydrobiologica, Volum 34

according acid activity amount analysis applied average bacteria calculated carbon cells changes channel chemical column compared compounds concentrations contaminants decrease degradation deionized water deposition depth determined discharge distribution effect Elbe elements Environ environmental evaluation experiments extraction factor field Figure filter flood flow fraction Germany groundwater groups groyne heavy metals higher important increase indicators influence Italy Lake limestones limit load lower material matter mean measured ment methods mg/L natural nitrate nitrogen nutrient observed occur organic oxygen parameters patterns period phase phosphorus plants pollution present processes production profiles range ratio reduced release Research retention river samples scenario sediment shows sludge soil solution sources species standard station substances surface Table tests tion tracer treatment Type upper values volume wastewater