Where wastewater treatment is decentralized, septic sludge is produced, and must be evacuated, collected and treated in a centralized plant. Where possible, this is done at a centralized wastewater treatment plant with sufficient surplus capacity; but where such a plant is not available nearby, a special septic sludge treatment needs to be built (See also our HUBER Solution SeptageTreat).

During septic sludge reception, its volume and pH-value are measured and a retain sample is automatically taken from each batch. Individual accounting is done by means of a card reader and a connected computer.

Disturbing solids (e.g. debris) and heavy solids (grit and gravel) are removed in a HUBER Complete Plant. Alternatively, we use a Wash Drum. The mechanically pre-treated septic sludge is then dewatered in our Screw Presses. After composting, the treated septic sludge is land applied as fertilizer and for soil improvement.

We treat filtrate from sludge dewatering in a HUBER Membrane Bio-Reactor and recycle the effluent as process water (wash and spray water). Surplus effluent can be reused for irrigation.