Novel EGSB (expanded granular sludge bed) anaerobic reactor

The invention discloses a novel EGSB ((expanded granular sludge bed) anaerobic reactor. The novel EGSB anaerobic reactor comprises a water distributor, a particle sludge reaction region and a three-phase separator arranged above, wherein the water distributor is a detachable type and consists of a plurality of penetrating water distributing tubes which are uniformly distributed on the bottom; the two ends of the water distributor extend out of the outer part of the reactor; valves are arranged at the two ends of each water distributing tube; to-be-treated sludge enters into the reactor through one end of the water distributor; the three-phase separator consists of a primary separator and a plurality of secondary separators which are uniformly distributed around the primary separator; each separator is in the shape of a cylinder; an inverted funnel-shaped isolating part is arranged inside each separator; and a reflecting plate is arranged below each isolating part. An upper space of the reactor is divided into a gas channel, a gas chamber and a precipitating region through the isolating parts, and overflow weirs are formed in the two sides above the reactor. The separator and each water distributing tube are independent from each other, so that the novel EGSB anaerobic reactor is convenient to maintain and simple to operate.