RÖNNINGESJÖNS TILLFRISKNANDE. RESULTAT EFTER DAG- OCH SJÖVATTENBEHANDLING ÅREN 1981-1987 / Recovery of the Lake Rönningesjön in Täby, Sweden. Results of Storm and Lake Water Treatment over the Years 1981-1987
A fullscale plant applicating the Karl Dunkers’ system for combined treatment of separate storm water and lake water is since 1981 operating in the northern part of the lake Rönningesjön, close to Stockholm. The treatment is executed in three simultaneous steps: 1) flow balancing in tanks floating in the lake, 2) phosphorus removal using Fe and polymer as precipitation chemicals and floc separation in crossflow lamella clarifiers, 3) recirculation of lake water into the treatment plant during dry periods in order to remove phosphorus from the lake water itself. The storm water discharge from an urbanized area in the southern part of the lake is also since 1981 pumped directly to the lake outlet in order to reduce the phosphorus load in this part of the lake. “Complete abstract not presented.”