Wastewater treatment system including a moving bed assembly

A method of treating a fluid having an average flow rate within a reservoir, the method comprising:

• filling an interior of a moving bed assembly with a biocarrier media, the moving bed assembly including a frame housing, a retention screen coupled to the frame housing and extending at least partially across one side of the frame housing, the frame housing and the retention screen cooperatively defining the interior of the moving bed assembly, wherein a fill ratio of a volume of the biocarrier media to a total volume of the interior of the moving bed assembly is between 30% and 70%;
• and
• sinking the moving bed assembly in the reservoir such that the moving bed assembly is rested in position within the reservoir;
• supplying, after said sinking, air from an air supply unit to a diffuser and to the interior of the moving bed assembly, the diffuser being coupled to the frame housing, wherein the supply of air generates a turbulent flow of the fluid circulating between the interior and the reservoir and agitates the biocarrier media within the interior of the moving bed assembly, the circulating flow of the fluid causing a wastewater portion of the fluid to be repeatedly cycled through the interior to form a processed portion of the fluid, the circulating flow further causing the processed portion of the fluid to exit the moving bed assembly;
• and
• controlling the air supply unit to generate an effective pumping rate of the circulating flow that is at least double an average flow rate of the fluid within the reservoir.