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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 36

Plate and Frame Press

1) High solids content cake 2) Can dewater hard-to-dewater sludge 3) Very high solids capture 4) Only mechanical device capable of producing a cake dry enough to meet landfill requirements in some locations

1) Large quantities of conditioning chemicals are commonly used 2) High capital cost, especially for variable- volume filter presses 3) Labor cost may be high if sludge is poorly conditioned and if press is not automated 4) Media replacement is both expensive and time consuming 5) Noise levels caused by feed pumps can be excessive 6) Batch discharge after each cycle requires consideration of receiving and storing cake

Bucher Hydraulic Press

Side-by-side testing results with a belt filter press indicated that a hydraulic press can improve the biosolids and cake solids content by more than 25% compared to a belt filter press. The chemical conditioning requirements for a hydraulic press were similar to the belt filter press.

Batch process - low production rate

GENESIS Rapid Dewatering System

1) The operational cost of this technology typically runs 30-50% less than more common dewatering techniques 2) The required operational site, or footprint, is only about 150 by 150 feet, enabling the mobile Genesis dewatering unit to set up in small parking lots, on golf courses, or on barges. 3) No pits, ponds, or return channels are needed. Each mobile system is discrete in operation, emitting little noise or odor.

1) Unit costed and processed material is substantially higher than other less technically intensive options. 2) Potential mechanical breakdowns due to many unit processes

MECHANICAL

Atkins Water

Disadvantages

INTEGRATED SYSTEMS

Genesis Fluid Solutions

Table 3 Continued Dewatering Technologies Advantages and Disadvantages

Advantages

Type

Classification

MECHANICAL

Vendor

Ascension Industries

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