The UASB process is described, wherein the organic matter is digested, adsorbed, absorbed and metabolized into bacterial cell mass and biogas. It is a combination of physical and biological processes.
The main feature of the physical process is separation of solids and gases from the liquid and that of the biological process is degradation of decomposable organic matter under anaerobic conditions.
WHY SHOULD YOU SELECT UASB TREATMENT?
LOW AREA REQUIREMENTS AND COMPACT DESIGN.
Loadings upto 15 kg COD/m3 reactor volume per day can be applied for most types of wastewaters. As a result the treatment plant requires a relatively small area.
HIGH EFFICIENCY AND ROBUST DESIGN
The efficiency of the process varies between 70% and 90% depending upon the origin of wastewater. The reactor is robust in design and can take shock loads.
LOW POWER REQUIREMENTS
UASB treatment system requires minimum electro-mechanical equipment. Since the process is anaerobic in nature, there is no need of power consuming aeration systems.
BIOGAS PRODUCTION AND ENERGY RECOVERY
For each 13 kg of input COD in the UASB reactor, approximately 1 m3 of biogas is produced, which has about 70%-80% methane. High methane contents make biogas suitable for its use as fuel.
LOW SLUDGE PRODUCTION
Excess sludge production is very low in a UASB reactor. The sludge generated in the UASB reactors is of anaerobic nature, is already mineralized with high NPK levels, stable and suitable for use as manure.