If due to increased load or stricter discharge requirements the extension of conventional WWTP is necessary, and the requirements cannot be achieved by an upgrade of the plant, a parallel Hybrid System could be the ideal choice.

For this cost-efficient solution, a separate MBR is built, treating a partial flow and requiring only a minimal footprint. The high-quality filtrate can either be re-used, or is blended with the discharge of the conventional treatment plant in order to achieve improved discharge parameters for the whole plant.