The wastewater is mechanically pre-treated in a HUBER ROTAMAT® Complete Plant with integrated fine screen and grit chamber. The screenings are washed and compacted, the grit is classified and if applicable washed in our COANDA Grit Washer, so that the sand can be recycled as building material. In order to remove hair and fibres, we further provide our Micro-Screen ROTAMAT® Membrane Screen RoMem with a mesh size between 0.5 and 1 mm.
After intermediate storage for flow and freight equalization, the wastewater is chemically conditioned. Type and dosage of the chemicals depend on the wastewater's composition and the requirements; we usually perform pilot tests. In any case we add polymers for flocculation. The chemically conditioned wastewater is treated in a HUBER Dissolved Air Flotation Plant (DAF). Fats and solids are almost completely removed as flotate sludge. The BOD and COD freight is strongly reduced. The DAF effluent can be discharged into municipal sewers.
Where the wastewater is to be directly discharged into receiving waters, or where it is recycled as process water, we treat the wastewater further. One option is a HUBER VRM® Membrane Bio-Reactor for full-biological treatment. The membranes retain all solids and bacteria. Alternatively, where the requirements are less stringent, we add flocculants and provide our CONTIFLOW® Sandfilters for chemo-physical treatment and polishing.
We reduce the amount of waste activated sludge from biological treatment and of flotate sludge with HUBER machines for Sludge Thickening and Sludge Dewatering. We can achieve further reduction with a HUBER Sludge Dryer. Dried sludge can be used as fuel.
When we implement our solutions, we also provide our well-proven HUBER stainless steel components, e.g. Screw Conveyors, Manhole Covers and Stairways, Platforms and Guardrails.