The HydroThane STP UASB (Upflow Anaerobic Sludge Blanket) process is the most commonly applied method for the biological treatment of industrial effluents. The first UASB pilot plant was installed at a beet sugar refinery in The Netherlands (CSM Suiker) in the 1970's.
Thereafter, a large number of full-scale plants were installed throughout the Netherlands at sugar refineries, potato starch processing plants, and other food industries as well as paper recycle plants. Nowadays the UASB process is a proven and worldwide accepted process.

Characteristics HydroThane STP UASB:

- HydroThane UASB design offers maximum process stability because of its controlled external re-circulation flow and is not dependent on the influent COD/flow.
- Due to the over-pressure design of the HydroThane STP UASB process a (bio)gasholder is not required!
- The phase-separators are made completely of PP material so no corrosion possibilities in the HydroThane STP UASB reactor.
- The phase separators are based on the mammoth stream principle.
- The UASB has no complex internals or rotating equipment within the UASB reactor (thus no maintenance, no clogging at all within the reactor).
- The loading rates for this kind of reactor are typically in the range of 5 - 15 kg COD/m³day.