An expanded granular sludge bed (EGSB) reactor was adopted to study the influence factors and rule of enhancing granular sludge concentration and performance. The experiment was performed at 33 ℃,pH 6.0-8.0 with continuous flow by adding proper quantity of nutritional trace elements. The results show that SLR was the key of steady operation of EGSB reactor. The increment of the granular sludge was influenced by volume loading rate (VLR),liquid up-flow velocity and sludge loading rate (SLR). Concentration of granular sludge increased rapidly when liquid up-flow velocity was over 0.94 m·h-1 with SLR being at 1.0-2.0 d-1. With the propriety parameters:liquid up-flow velocity 2.52 m·h-1,SLR 1.0-2.2 d-1 and VLR 8.2-13.1 kg·m-3·d-1,23 days' continuous operation resulted in an increment by over 80% of granular sludge concentration in the EGSB reactor,plus good granular sludge property.
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