The waste(water) enters the bottom of the reactor and flows upwards through a sludge bed. While passing through the sludge bed, organic matter is converted into biogas. In the upper part of the UASB reactor, the liquid effluent and biogas are separated. Sludge remains inside the reactor and excess biomass is periodically taken out.
Most of the nitrogen and phosphorous compounds are present in the effluent. Therefore, the effluent of a UASB is suitable for the application of subsequent nutrient recovery technologies.
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