For larger catchment areas or higher flow rates, it is possible to individually combine a certain number of filter elements.
For such filter structures, sedimentation and filtration are separated, i.e. a sedimentation unit must be installed before the actual filter unit. The planning is done on a case-by-case basis according to the conditions of the catchment area and the purification objective. This can be designed as a semi-centralized as well as a decentralized solution. By detaching the sedimentation plant, there are no limits to the decentralized solutions and thus the sedimentation plant or even several, depending on the conception of the project, can be installed at the point of origin and the filter unit can be detached from it as a semicentralized solution at a favorable location. The plants can be designed as direct-flow filter units. It should be noted that each filter compartment must be shut off for maintenance purposes.
The quality of the purified water of this decentralized solution for rainwater treatment is so high that it can be discharged directly into surface waters. In the system, rainwater is purified by sedimentation, adsorption, filtration and chemical precipitation. In the first step, the water passes through a sedimentation unit where solids are safely removed. Then, in a second structure, the water passes through a series of filter elements in an upflow process. Depending on the purification target (heavy metals, phosphorus), the filter elements can be filled with adapted filter materials. The elements are easily replaceable. Which further supports the approach of the decentralized solution for rainwater treatment.
Stormwater treatment plant Technical data
Central solution for rainwater
Dimensions of the concrete structure: project-related
Minimum height loss between inlet and outlet: 25 cm
Connectable area: > 10,000 m² depending on the pollution and the cleaning objective