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Literature Review & Summary Report Design Basis Memorandum

BCI Project No. 19-15089 September 2007

St. Johns River Water Management District Contract # SK940AA

Page 11

Sediments are retained in the cyclone overflow which is typically directed to a dewatering process.

Typical hydrocyclone capacity ranges from 1,000 to 2,000 gallons per minute of a 30 – 35 % solids feed.

Figure 6 Hydrocyclone

2.3.3 Equipment Type – Electrodewatering

A direct current voltage is applied to the biosolids mixture. The application of current in the initial stages of dewatering causes particles to migrate to the electrode of opposite charge (i.e., electrophoresis). Once a cake is formed, electroosmosis occurs as ions migrate to the appropriate electrode to compensate for particle charges. Electrodewatering can also be combined with conventional filter presses. A cost benefit of electrodewatering is likely greatest for sludge that does not respond well to traditional pressure filtration. Studies have demonstrated

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