THICKENING
Traditionally used to reduce the amount of liquid in the digestion phase of the plant, thickening can be accomplished either through gravity style thickening tanks or mechanical means. Thickening tanks typically are larger and require more footprint, however they do not require buildings and yield polymer savings to achieve their ends. Gravity thickeners are more functional on primary solids than secondary. Mechanical thickening is usually done with either a rotary drum, gravity belt, DAF or centrifuge but a good three belt press can dual function as a thickening device by utilizing the gravity deck portion of the press and an earlier take off point. This can offer substantial saving if a facility can combine thickening and dewatering in one unit.
Gravity Thickening
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