SANITARY ASPECTS OF THE OBTAINING OF DRINKING-WATER FROM BANK FILTRATION AND GROUNDWATER RECHARGE

Today, bank filtration and artificial recharge of groundwater are two important process steps of the obtaining of drinking water, in view of the fact that the pollution of surface waters has considerably increased. If surface waters are highly polluted, in many cases a preliminary treatment is necessary. To provide protection from heavy bacterial contamination, it is recommended to orientate towards a bottom passage of the infiltrating surface water of at least 100 days. Under favourable conditions, the periods of survival are 100 days for E. coli, 100 days for Salmonella typhii, up to 200 days for Yersinia, and up to 250 days for polioviruses. A high quality of the drinking water obtained from bank-filtrated and infiltrated water is secured by protection of waters from pollutions in their catchment areas and by a drinking water treatment meeting all hygienic demands.