Planted soil filters with activated pretreatment for compost-place wastewater treatment

With the series of buffer tank, activated preclarifier and planted soil filters, it is possible to have a flexible operation by unsteady inflow and changing concentrations. An automatic control manages the storm-water runoff, and the water-recirculation provides a minimal feed, so the plant always runs effectively. Experiences with this plant since 1999 are given in the frame of the project “Planted Soil Filters as a Biotechnological Process”, founded by the German Federal Environment Fondation (DBU). Today, after six years of running, the results are still satisfactory.