Gravity Belt Thickeners (GBTs) in action at a Waste Water Treatment Plant.

GBTs serve the purpose of "thickening" sludge (poo solids) and removing water/liquids in efforts to separate the solids from the liquids. The blue pipe seen briefly at the beginning of the video is where WAS (Waste Activated Sludge) is mixed with a polymer solution. WAS is essentially solids (poo solids) that have already gone through a few phases of the treatment process already. Much of the organic material has already been removed along with much of the thicker grit and heavier solids. The polymer acts like a glue that allows the solids to attract/stick to each other. By clinging together, the water is squeezed out and drains through very small holes located along the belt that carries the solids from one side of the belt to the other.

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