The BIOPAQ® UBOX combines anaerobic and aerobic biological treatment of waste water in one single reactor. UBOX unites Upflow anaerobic sludge Blanket technology and aerobic OXidation of residual COD and ammonia. As a result a very compact plant can be constructed that will not generate any odour emissions. This newly developed technology has already resulted in the installation of several full-scale plants, both in the municipal and industrial field. 



Advantages of the BIOPAQ® UBOX process
- small footprint, compact construction;
- no moving parts;
- low energy consumption for aeration of the residual biodegradable matter;
- possibility of energy reuse from biogas production;
- low sludge production;
- low maintenance requirements.

Working principle
The UBOX reactor consists of 2 sections: an anaerobic lower section and an aerobic upper section. The wastewater is pre-treated anaerobically using anaerobic sludge in the bottom part. Biogas is produced and separated in the three phase proprietary separators installed in the UBOX reactor. The separator modules will also effectively keep the anaerobic sludge in the lower part of the reactor. 

In the upper part of the reactor air is introduced to enhance aerobic degradation of the residual COD. An efficient separator in the upper part of the tank allows for the discharge of settled effluent while keeping the activated sludge within the reactor, while avoiding the air bubbles to interfere with the settling process.