Expanded granular sludge blanket reactor (EGSB reactor) refers to
the anaerobic reactor integrating the bottom sludge zone and
mid-upper gas, liquid and solid-phase separation zone, with high
rising flow velocity inside the reactor through back-flow and
structure design and in which granular sludge is in the expansion
EGSB reactor is actually the improved UASB reactor. It is operated
at high rising flow velocity to make granular sludge at suspension
state, and then keep full contact of water inflow with sludge
granules. EGSB is featured by the expansion state of granular
sludge blanket with high rising flow velocity.
EGSB reactor is mainly composed of water distribution device,
three-phase separator, effluent collection device, circulation
device, sludge discharge device and gas-liquid separation device.
See the left figure for structural style of EGSB reactor.