An expanded granular sludge bed (EGSB) reactor is a variant of the UASB concept [1] . Upflow Anaerobic Sludge Blanket ( UASB) technology normally referred to as UASB reactor is a form of Anaerobic digester that is used in the treatment of Wastewater The distinguishing feature is that a faster rate of upward-flow velocity is designed for the wastewater passing through the sludge bed. The increased flux permits partial expansion (fluidisation) of the granular sludge bed, improving wastewater-sludge contact as well as enhancing segregation of small inactive suspended particle from the sludge bed. The increased flow velocity is either accomplished by utilizing tall reactors, or by incorporating an effluent recycle (or both). A scheme depicting the EGSB design concept is shown in this EGSB diagram.
The EGSB design is appropriate for low strength soluble wastewaters (less than 1 to 2 g soluble COD/l) or for wastewaters that contain inert or poorly biodegradable suspended particles which should not be allowed to accumulate in the sludge bed.
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References
- ^ UASB and EGSB Field, J. Anaerobic digestion is a series of processes in which Microorganisms break down Biodegradable material in the absence of Oxygen. The following is a partial list of different types of anaerobic digesters. Upflow Anaerobic Sludge Blanket ( UASB) technology normally referred to as UASB reactor is a form of Anaerobic digester that is used in the treatment of Wastewater (2002) Anaerobic granular sludge bed technology pages, anaerobic granular sludge bed reactor technology
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