Phosphorus Treatment Methods and Costs in Stockholm’s Lakes and Waterways
The Environment Administration proposes that the committee approve the response to questions about how Stockholm treats phosphorus in lakes and waterways. Sediment treatment is generally considered to have a longer-lasting effect than adding aluminium to the water, but it costs somewhat more and may pose risks to pipelines, archaeological remains and contaminated lakebeds; therefore, water treatment is used, for example, in Riddarfjärden. The City has not yet compared the cost per amount of phosphorus bound, and treatment may need to be repeated if new phosphorus discharges continue, as illustrated by Långsjön after about 20 years.
This summary is based on the meeting agenda. We'll update when the minutes are published.
The original document is available at
meetingspublic.stockholm.se.