A Look at Newer Methods for Dewatering Wastewater Sludges
The U.S. water cleanup effort is resulting in the production of huge quantities of additional sludge. Because of the difficulty of disposing of this sludge, it is usually dewatered. Although...
Review of Dry-Mix Coarse-Aggregate Shotcrete as Underground Support
Shotcrete: Wet or Dry Process
Electro-Osmotic Dewatering with Polarity Reversals
An increasing body of evidence suggests that reversal of electrode polarity or current direction during electro-osmosis leads to improved consolidation and more efficient dewatering. This...
Dewatering Rock for Construction
Dry-Wet Tower Evaporation and Fog Psychometrics
To determine the adequacy of existing dry-wet tower configurations and to evaluate proposed combinations of dry-wet towers with regard to various environmental consequences, it is necessary...
Thermodynamic Models of Dry-Wet Cooling Towers
The basic thermodynamic models, which are necessary for a comprehensive consideration of all cooling system costs, are outlined herein for the combination dry-wet cooling tower. The various...
Dewatering Chemical-Primary Sludges
The efficiency and the cost of dewatering lime and alum generated physical-chemical treatment sludge were developed utilizing a continuous vacuum filter and a solid bowl conveyor centrifuge....
Economic factors of Dry-Wet Cooling Towers
Comtemporary dry-wet design efforts and economic studies are reviewed and promising configurations are delineated. The basic accounting scheme and all relevant parameters necessary for...
New Gravity/Pressure Unit Cuts Sludge Dewatering Costs
A new device for dewatering sludges from either industrial or municipal waste treatment plants promises to cut both initial capital and operating costs over more traditional methods such...
Chemical Sludge Dewatering on Sand Beds
In this study the draining and drying rates of chemical sludges applied to sand beds were related to several sludge characteristics. It was found that the time to drain was related to...
Electro-Osmosis Applied to Unstable Embankment
In the course of construction of a large dry dock project in Singapore, an 8-m high cofferdam embankment was constructed by end tipping decomposed granite material into the sea. At the...
Transport Phenomena Applied to Sludge Dewatering
Sludge dewatering is examined and treated as a flow of liquid (filtrate) through a nonrigid (deforming) saturated flocculent porous medium. A flocculent porous medium model is developed...
Dewatering Case History in Florida
A project required lowering the water 15 ft in a 100-ft x 110-ft excavation in sand in Florida. A wellpoint system finally reaching 452 points pumping 8,000 gpm from three stages with...
Attitudes in Sludge Treatment and Disposal
In addition to improving the technology, there is a need to reassess some of the attitudes which have influenced present sludge management schemes. While the focus for many sludge management...
Optimal Pumping for Aquifer Dewatering
A method is presented for determining the optimal well locations and steady-state pumping scheme for dewatering a site. It uses the finite difference approximations of the ground-water...
Economic Aspects of Sludge Dewatering and Disposal
The economics of sludge handling for large plants utilizing vacuum filtration and incineration or land disposal have been investigated using the total disposal system concept. Disposal...
Circular Land Cofferdam for Deep Excavation
Site conditions, dewatering, design, construction procedures and observations and stress measurements made during construction of a circular land cofferdam for a 79-ft (24.0-m) deep excavation...
Unsteady Drawdown in Well Groups
The unsteady drawdown response has been studied for a variety of well groups which are arranged in a two-line or rectangular array. The individual wells are assumed to fully penetrate...
Estimation of Sludge Centrifuge Performance
The laboratory bottle centrifuge is used to evaluate the possibility of dewatering any particular sludge by centrifugation. Two variables, centrifugal force and residence time, are assumed...
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