Dewatering and eliminating citrus waste treatment sludges has been a difficult and costly disposal problem for many years. One of the major drawbacks of the dewatering operation has been the extent of bound water that is associated with the sludge under gravity settlers, and its relatively low specific gravity difference as related to water. Under various operating conditions, especially in the south, some gravity settlers have been able to thicken the BOD solids to 1½ to 2% total solid concentration, but this also tends to present other operational problems due to low blanket turnover and does very little to solve the major problem of obtaining saleable by-product from this biological material.

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