The adsorption mechanisms of algae-bacteria symbiotic system and its fast formation process.

•The formation of the ABSS was described by SEM and zeta potential.•Zeta potential and SBET play a key role in the early stage of adsorption.•The role of EPS accounted for 84.22% for adsorption capacity.•The formation process of ABSS could be divided into the fast stage and slow stage.