Roger G. Miller, P.E., President Miller Engineers & Scientists

Versatility of Vacuum Bag Dewatering (pat pend) of Dredged Organic Silt
Roger G. Miller, P.E., President Miller Engineers & Scientists Sheboygan, Wisconsin, USA Geotube Gravity Dewatering Organic Silt after three months in Geotube
Moisture Content = *120% Liquid Limit = *140% Plasticity Index = *80% Percent Sand and Gravel = *35% Su/Pp ~ *Dry Wt Basis Vacuum Bag Prototype Test (2008)
Clear Water Discharge Vacuum Bag System Mechanical Filter Plate Presses, LFR 2009 Sediment Cake after Dewatering Drainage Layer Thickness vs. Time
Organic Silt Layer Thickness Feet (m) Time To Consolidate (Days) 1 (0.3) 2 2 (0.6) 10 3 (0.9) 23 4 (1.2) 41 Time for dewatering is proportional to the square of the height of the material. Temperature vs. Time Material Temperature Degrees F 34 50 59 68 77 86 95 104 113 (Degrees C) (5) (10) (15) (20) (25) (30) (35) (40) (45) Time Adjustment Factor 1.52 1.31 1.14 1.00 0.89 0.80 0.72 0.65 0.60 Increasing material temperature shortens consolidation time by lowering the viscosity of the pore water. Vacuum Bag Consolidation of Geotubes Vacuum Bag Dewatering in Barge Vacuum Bag Dewatering of Sedimentation Basin Reef Building or Deep Water Disposal Sediment Vacuum Bag Dewatering in the Lab Contact Information: Roger G. Miller, PE, President Miller Engineers & Scientists 5308 South 12th Street Sheboygan, WI Phone (800) US Patent 7,454,847 B1 issued and general concept patent pending.