The BIOPAQ®UBOX combines the removal of organic compounds with first stage anaerobic and second stage aerobic biological treatment of wastewater in one compact reactor.

BIOPAQ UBOX - anaerobic and aerobic COD removal by Paques

Energy input and sludge production are very low compared to conventional treatment plants, due to the anaerobic conversion of the major part of the biological matter. Further benefit is the elimination of odour since the anaerobic compartment is fully closed and first stage effluent is directly routed into the upper aerobic stage. The absence of a secondary settling tank eliminates the hazard of mosquito breeding.

This technology is applicable as sewage treatment in (sub)tropical climates, but also finds its way in industrial applications.

Capacities are in the range of 5,000 to 100,000 p.e.

This technology has already been proven at several full-scale plants, both in the municipal and industrial field.

Advantages of BIOPAQ®UBOX

  • 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
  • No odour emissions
  • Low maintenance requirements

Working principle

The BIOPAQ®UBOX bioreactor has two 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. The separator modules 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, at the same time avoiding air bubbles to interfere with the settling process.