Upflow Anaerobic Sludge Blanket (UASB)

The operation of UASB reactors is significantly different from other technologies. Raw materials are moved hydraulically without agitators.


Technology Description

The active zone is a layer with granulated bacteria that form colonies in the form of plaque. After contact with the organic substances and bacteria in the active zone, the release of biogas occurs. A gas bubble attaches to the surface of a granule and rises from the base of the reactor to the top.

A gas separating membrane is installed in the upper part, which separates the gas bubble from the granule. The granule, after separation from the gas bubble, sinks to the active zone, resulting in the raw material being mixed without stirrers.

UASB uses very liquid raw materials with soluble sugars like wastewater, milk whey, molasses and distillery wastewater. UASB reactors operate with a very high organic load of 12-20 kg / m³, and the hydraulic retention time is just 1-3 days.

This allows the processing of large volumes of effluents in a small-volume reactor.

Distinctive features:

  • high-load of organic dry matter (ODM) 12-50 kg / m³
  • sulfur removal with activated charcoal filters
  • short retention time
  • hydraulic mixing by gas up-flow
  • granulated sludge
  • cooling of biogas in a chiller
500 kW to 10 MW
power capacity

Suitable substrates:

  • yeast plant effluent
  • post-alcohol molasses stillage
  • whey
  • paper mill effluents
  • drink industry wastewater

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