NATURANPASSAT- DRIFTSNÅLT – Öppna filterbäddar, tre nya anläggningar / Open Low-loaded Filter Basins
Open low-loaded filter basins with drains is one example of biological methods for sewage treatment. Results from two new units, in operation since 1991, show a 95 %-reduction of total-P and BOD7 during the summer. The reduction is less during vintertime, due to lower biological activity in the filter. A study of this type of sewage treatment will be performed by VA-Ingenjörerna on commission of VAForsk. The purpose is to obtain more knowledge of function and long term results, which will simplify design of new treatment units.