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As an emerging sustainable process, knowledge of microalgal-bacterial granular sludge (MBGS) for the treatment of complex organic wastewater is limited, which hinders its further technical application. In this work, the MBGS process for the disposal of wastewater with simple and complex organic substances was evaluated in a comparable manner. The results showed that the average COD, nitrogen and phosphorus removal efficiencies for wastewater containing simple/complex organic matter were 75.2/84.9%, 96.6/89.3% and 76.2/85.3%, respectively. It has been found that complex organics can promote granule size growth and bacteria growth, as evidenced by the decrease in chlorophyll content and cellular carbon-nitrogen ratio compared to simple organics. Chloroflexi became the dominant bacterium of MBGS for potential contribution to the breakdown of complex organic matter. In addition, the settling …