KONSTGJORD INFILTRATION VID EMMABODA VATTENVERK / Artificial Groundwater Recharge at Emmaboda Waterworks
The artificial groundwater recharge has been studied in order to earn knowledge about the processes active in this kind of drinking water production. Water and soil samples were taken from the infiltration basin and analyzed for their content of iron, manganese and organic carbon. The quality of the infiltrating water was rapidly improved with 95 and 90 percent removal of iron and manganese respectively, after 15 cm transport trough the filtersand. Manganese was found accumulated in large quantities in the uppermost filtersand, while iron accumulated to a lesser amount. Regular cleaning of the filtersand seems to sustain good operating conditions of the filtersand. Organic substances were not accumulated in the filtersand. Unsaturated flow prevailed in the filtersand and air samples were taken here. Their content of carbondioxide and oxygen was examined, showing a tenfold increase of carbondioxide, compared to atmospheric concentration. This indicates favourable conditions for dissolution of a layer of lime in the filtersand. Such a dissolution could improve the alkalinity of the water, giving a less corrosive water.