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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 34

PHYSICAL

Veolia Environmental Services Separations

Solid BowlCentrifuge

1) Continuous feed process typically requiring less labor/operator effort 2) Best technology for most oil/water/solid and latex sludge streams 3) Thickened sludge is truckable

PHYSICAL

Dorr-Oliver Eimco USA Inc. Sales

Deep Cone Thickener

1) Maximum water recovery for recycling 2) Disposal by stacking not ponding 3) Minimum installed thickener area 4) Minimum disposal volume 5) Sludge transportable by pumps 6) Minimum liquid discharge after deposition

PHYSICAL

Linatex Tennessee

Hydrocyclone

1) Effective at removing sand sized fraction 2) No moving parts within the cyclone 3) No power consumption, other than delivery of slurry

PHYSICAL

Waste Technologies of Australia Environmental Biotechnology CRC Pty Ltd

Electrodewatering

1) Current costs for electrodewatering are higher than costs for standard belt filter presses. With continued improvements, however, costs should be comparable to belt filter presses as the process is a slight modification of the press. 2) Increases in operating cost over conventional belt filter presses due to higher electricity use should be offset by the reduction in tipping fees associated with disposing of a drier and less voluminous product.

1) Coarse fraction typically retains a large amount of light organic solids. 2) Limited capacity, multiple units required 3) Sediment laden cyclone overflow must be moved to a disposal area 4) Feed slurry must first be screened for debris and oversize material 1) Current costs for electrodewatering are currently higher than costs for standard belt filter presses. 2) Increases in operating cost over conventional belt filter presses due to higher electricity use

Classification

Table 3 Continued Dewatering Technologies Advantages and Disadvantages

Vendor

Type

Advantages

Disadvantages

1) Typically requires polymer/chemical addition to pre-condition sludge 2) Centrifuge cake is not as “dry” as filter press cake, therefore, less waste volume reduction 3) Operation requires higher skill level and more experience 4) Operation requires greater amount of electric power compared to filter press and belt press technology No disadvantages listed

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