UPPGRADERING AV ETT BEFINTLIGT YTVATTENVERK VATTENVERKET BORG I NORRKÖPING / Upgrading of an Existing Surface Water Treatment Plant. The Borg Water Treatment Works in Norrköping
The water treatment works named Borg delivers drinking water to about 100,000 inhabitants in Norrköping. Raw water is taken from the river Motala ström. Because of the raw water quality there are sometimes problems with bad taste and odour in the purified water. By pollution from a paper pulp factory with chlorine bleachery, situated upstreams the water works, the content of chlorinated organic compounds, measured as AOX, is very high in the raw water. The finished chlorinated water has a high AOX content ad shows some degree of mutagenicity according to Ames’ test. Attempts have been made to change the purification process in the first hand to improve the taste and odour of the water. The purification process includes precipitation with aluminium sulphate, sedimentation, rapid and slow sand filtration. Pilot plant filters with granular activated carbon (GAC) have been tested in several different places in the process and the effects regarding organic content, odour, AOX and mutagenicity have been studied. “Complete abstract not presented.”