Water treatment system with retrievable mounting frame assembly for diffusors

A method for aerating water in a treatment basin, comprising:

• positioning at least one bridge above an upper surface of the water in the basin, the at least one bridge comprising a walkway extending from a first sidewall portion of the basin to a second sidewall portion of the basin;
• providing at least one retrievable mounting frame assembly, comprising a frame;
• a plurality of aeration elements;
• a plurality of mounting brackets to secure the aeration elements to the frame;
• and a first air distribution conduit coupled to the aeration elements for supplying an air flow to the aeration elements;
• securing at least one guide rail assembly to the at least one bridge, wherein the at least one guide rail assembly extends from the at least one bridge to a floor of the basin;
• transporting the at least one retrievable mounting frame assembly on a transport device to a selected position on the walkway proximate the at least one guide rail assembly;
• securing at least one transfer crane to the walkway proximate the at least one guide rail assembly;
• transferring the at least one retrievable mounting frame assembly from the transport device for connection to the at least one guide rail assembly using the at least one transfer crane;
• connecting the at least one retrievable mounting frame assembly to the at least one guide rail assembly to provide a supply of air to the first air distribution conduit;
• moving the at least one retrievable mounting frame assembly from a first position above the upper surface of the water to a second position below the water;
• and
• initiating a flow of air to the first air distribution conduit.