European Water Treatment Practices — Their Experience with Ozone
Today, more than 1100 water treatment plants worldwide use ozone for some purpose. In Europe, it is always regarded as a water-treatment technique and seldom simply as a disinfectant....

Modern Concrete Structures Survive Romanian Earthquake
On March 4, 1977, 35 buildings collapsed during a severe earthquake (7.2 on the Richter scale) in Bucharest, Romania. Thirty-two of the 35 were older structures, erected before World War...

Structural Performance of Cast-in-Place Pipe
Results of studies of the structural behavior of cast-in-place pipe under typical loads and field conditions are presented. Analyses include a simplified method along with studies based...

Present and Future Trends in Foundations
Progress in building methods was slow until the Industrial Revolution ushered in an age when tremendous improvements (steel, iron, cement etc.) and machinery (powered, at first, by steam...

Philadelphia Bridge Sparked Growth of Prestressed Concrete in the U.S.
Prestressing has been used for centuries. For instance, iron bands were heat-shrunk over built-up wooden wheels to increase their resistance to damage. In 1888, a man named Jackson from...

Practical Refuse Recycling
The residue remaining after incineration of municipal solid wastes can be processed for recycling as a substitute for mineral aggregates in asphalt pavements. Limited reclamation of ferrous...

Half a Century Progress in Soft Ground Tunneling
The paper summarizes major developments in the practice of soft ground tunneling in the United States, highlighting the important tunnels constructed in the last half century. The evolution...

Corner Restoration in Missouri
The Office of the State Land Surveyor in Missouri is actively engaged in a program of remonumenting the section and quarter section corners in the State of Missouri. One phase of this...

Foundation Behavior of Iron Ore Storage Yards

Effects of Iron on Activated Sludge Treatment
The importance of inorganic nutrients on activated sludge treatment has not been emphasized or studied extensively. Studies of the fundamentals of inorganic ions have been limited to nitrogen...

Coagulation of Iron Oxide with Alum
Coagulation of dilute iron-oxide suspensions with alum has been studied at different pH values and coagulant concentrations. Measurements of pH, mobility, and particle concentrations in...

Force Reduction in Excavation Devices
Three new concepts are described for earth excavation, slurry-wall excavation, and rock boring. In each case the need for application of force from an external device is substantially...

Underground Pipeline Corrosion
It has been estimated that losses to the water works industry in the United States due to underground corrosion are in excess of $150,000,000 annually. Work definitions and theory of underground...

Iron, Engineers, and Urbanization
Remains of the cast-iron age are easily found in present day cities although progress has served to erase many of them from existence. In the old sections of the downtowns, one is likely...

Influence of Joints in Panelized Structural Systems
Multistory residential structures are partially well suited to panelization and thus industrialization. Compared to the cast-in-place coupled shear wall, the panelized structure is less...

Junction Losses in Laminar and Transitional Flows
Analytical and experimental studies were carried out to develop additional data on energy losses at a junction for systems operating in the Reynolds number range of between 10 and 10,000....

Precast Concrete Tunnel Linings for Toronto Subway
Precast concrete tunnel linings have been used in the Toronto subway system in a wide range of soil conditions. This has resulted in a significant cost saving compared with the traditional...

Least Cost Sand Filter Design for Iron Removal
In the optimization of a single-media filter, it is necessary to be able to predict all combinations of filter design variables which will provide equivalent performance and determine...

Anaerobic Digestion of Sludges Containing Iron Phosphates
The phosphorus removals can be enhanced by precipitating bulk of the phosphorus with cation addition to the existing plants without costly alterations. Ferrous-iron was used to precipitate...

Iron Removal using Magnesium Oxide
The calcined magnesite-diatomaceous earth process is currently being used for the removal of iron from ground water supplies. However, information from controlled laboratory studies describing...

 

 

 

 

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