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Literature Review & Summary Report Design Basis Memorandum St. Johns River Water Management District Contract # SK940AA

BCI Project No. 19-15089 September 2007 Page 18

Figure 13 Coarse Screen/Fluid Bed Technology

2.5.2 Equipment Type- ID&D® - Integrated Dredging & Dewatering

Integrated Dredging & Dewatering – ID&D® was developed by JF Brennan Co. Inc., under an alliance with Phoenix Process Equipment Co. to provide an integrated process of dredging and dewatering. Included is the added benefit of being able to re-utilize dredged sediments, which required a system capable of segregating and dewatering sediments as well as the ability to remove any intrained debris. Further, many clients had insufficient space to passively dewater dredged slurries. The ID&D®/PHOENIX system uses a combination of chemical and mechanical methods to achieve high-speed segregation and dewatering of the dredged sediments (Figure 14). Processing rate information is currently unavailable. This system includes a group of conditioning and settling equipment and processes that work in series. The series includes a scalping screen for large debris removal; a hydrocyclone for sand removal; a polymer injection unit; a clarifier/thickener; second polymer injection unit; and belt filter press.

The PHOENIX HiFlo™ Thickener combines water clarification and solids separation and thickening in one step, greatly reducing the volume going to a slurry pond by thickening solids from 4-10% by weight to 40%, or more. If complete elimination of a confined disposal area is desired, the thickener underflow is sent to a PHOENIX belt filter press, where the sludge may be thickened to as high as 75% solids. This results in a dry cake that is easy to convey, store, stack, or handle.

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