What type of chamber is used to maintain lighter organic materials in suspension?

The type of chamber used to maintain lighter organic materials in suspension is a flotation chamber. This chamber utilizes the principle of flotation, where fine bubbles are introduced into wastewater, allowing lighter organic materials to rise to the surface, forming a froth that can be easily removed. The design encourages the separation of lighter materials from the heavier constituents of the wastewater stream, which is essential for effective treatment processes.

In contrast, an aerated grit chamber is primarily designed for the removal of settleable grit and coarse materials through aeration, not for keeping organic materials suspended. A settling basin, on the other hand, is meant for allowing particles to settle by gravity, which would be counterproductive for lighter organic materials that need to remain suspended for effective treatment. Similarly, an equalization tank serves to balance flow fluctuations in wastewater management but does not specifically target the suspension of lighter organic materials. Thus, the flotation chamber is specifically suited for this purpose, making it the correct choice.