Due to the high biomass concentration, the contact between the dissolved organic matter and the active biomass are maximized. The suspended solids are trapped in the granular bed for a sufficient period to allow hydrolysis followed by further degradation to occur. The SGBR has been shown to be capable of treating a variety of wastewaters at high organic loading rates and short HRT in laboratory scale studies, and it has been successfully employed for pilot scale treatment of meat processing wastewater (Park et al., 2012; Roth and Ellis, 2004).