Venturi-type submersible aerators are efficient systems that perform mixing and aeration simultaneously. They are suitable for use in industrial and municipal wastewater treatment plants, sludge treatment processes, homogenization processes, and rainwater storage tanks. These systems, which operate with submersible pumps of a certain power and wide free-passage channel impellers, can be installed without emptying the tank. In these devices, liquid is mixed with air by the Venturi effect, medium-fine bubbles are formed to increase the contact surface, and highly efficient oxygen transfer is achieved.