Water treatment system with retrievable mounting frame assembly for diffusors

1. 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.

2. The method of claim 1 , wherein the walkway includes parallel guide tracks extending along a length of the walkway.

3. The method of claim 2 , wherein the at least one transport device includes wheels and/or castors configured to engage in the guide tracks.

4. The method of claim 1 , wherein the at least one transport device has a width that corresponds to a width of the at least one bridge.

5. The method of claim 1 , wherein the at least one transfer crane includes a mounting base configured to be secured to the walkway proximate to the at least one guide rail assembly.

6. The method of claim 1 , wherein the at least one transfer crane includes a mounting base.

7. The method of claim 6 , further comprising providing a transfer trolley with a base plate and a plurality of wheels and/or castors and securing the mounting base to the base plate of the transfer trolley.

8. The method of claim 7 , wherein the walkway comprises at least one crane mounting plate, and wherein the base plate of the transfer trolley is configured to be secured to the at least one mounting plate.

9. The method of claim 7 , wherein the plurality of wheels and/or castors are configured to engage in the parallel guide tracks.

10. The method of claim 1 , wherein the at least one guide rail assembly comprises first and second parallel guide rails; a second air distribution conduit coupled to the first air distribution conduit; and a push-rod positioned between the guide rails and connected to the retrievable mounting frame assembly.

11. The method of claim 10 , wherein the push-rod is configured to facilitate movement of the mounting frame assembly along the guide rails between the first position above the upper surface of the water and the second position.