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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 4

2.0

RECENT DEWATERING TECHNOLOGIES

The information in this report is organized as both generic technologies and as proprietary or patented processes provided to us by the service providers. In many cases, the proprietary technologies may reflect a specific series of generic processes. The following list of rapid dewatering technologies was the result of an extensive on-line and electronic library

literature search.

Additional equipment types were noted during the search,

included, as they were generally derivatives into five classifications. These are:

of

those

described

in

this

list.

The

but

were not

list

is divided

  • Passive, which refers to reliance on natural evaporation and drainage to remove moisture;

  • Chemical aids, including polymers and coagulants which aggregate smaller particles together to form larger composite particles using various physical and chemical interactions;

  • Physical, in which two or more components of a system are separated based on physical properties or characteristics of the materials;

  • Mechanical, which requires the input of energy to squeeze, press, or draw water from the hydrated material; and,

  • Integrated systems, which use combinations of chemical, physical and mechanical methods to achieve rapid segregation and dewatering of dredged sediments.

Table 1 includes the list of dewatering technologies with examples of each included.

Details on the mechanisms associated with each technology, along with information on the dewatering properties are included in the discussion. A general process description is given, followed by known operational advantages and disadvantages of the various rapid dewatering methods in the context of shallow, subtropical lakes in urban watersheds. Nutrient dynamics in each process are discussed. Cost information is included where data was available, and a vendor is listed with each technology.

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