Becoming Greener with Green Sand: An Iron Castings Company Devises an Environmentally Friendly Liner System Reusing Foundry Byproduct
Metalcasting is one of the oldest methods of recycling�humans have a few millennia worth of experience with the technique�but today's industry still battles public preconceptions...
Nanotechnology Takes Roots
Nanoscale particles of zero-valent iron with a trace of noble metal catalyst are punching well above their weight in the area of environmental remediation. Their ability to destroy a wide...
Grand Finale
For 87 years Oklahoma's state capitol remained unfinished, the majestic cast-in-place concrete dome its designers envisioned never built. But as Oklahoma approached its centennial�to...
Closing the Gap
In 1944 Congress authorized construction of the Foothills Parkway, a 116 km highway through the Tennessee mountains along the northwestern edge of Great Smoky Mountains National Park....
Wetlands Treat Mine Runoff
Engineers were asked to design a treatment system for the severely acidic drainage from the Mike Horse and Anaconda metals mines in Montana. Challenges included the mountainous terrain,...
When Toxics Meet Metal
Zero-valent iron is an emerging remediation technology that transforms chlorinated solvents to harmless substances. Engineers and researchers have been studying the process for about five...
Defect Detection (Available only in Geo/Environmental Special Issue)
Sonic integrity logging technology can detect flaws in deep foundations more reliably and at less cost than conventional boring techniques. These non-destructive test tools are being used...
Interpretation of Nondestructive Integrity Tests Using Artificial Neural Networks
A barrier to more frequent use of nondestructive integrity tests on cast-in-place foundations is the difficulty of interpreting the test results to identify the presence or absence of...
Evaluation of Cast Iron Columns for Safety and Reliability
Cast iron columns exist in numerous vintage buildings. Alterations to these buildings often require analysis and modification of the structural system. This paper identifies codes that...
The Relationship of Speciation to Iron and Manganese Removal Strategies
Case studies are presented describing how Fe and Mn speciation procedures were used to solve process problems at two water utilities. A series of filtration steps are used to separate...
Comparison of Biological and Chemical/Physical Iron Removal
The report compares the efficiency of chemical/physical and biological iron removal processes during the entire filter cycle. The results of the first three pilot studies performed in...
Evaluation of Fe oxide-coated GAC for removal and recovery of Cu(II) from water
A composite solid, prepared by precipitating an Fe oxide onto granular activated carbon (GAC), was evaluated as an adsorbent for the removal and recovery of Cu(II) from water. Relative...
Recovery and Recycling of Copper from Wastewater using Iron Coated GAC
The purpose of this study was to prepare composite adsorbents that could be packed into a column and have adsorption characteristics similar to Fe oxide. This adsorbent was targeted to...
Arsenic Removal by Manganese Greensand Filters
Some of the small communities in Saskatchewan are expected to have difficulty complying with the new maximum acceptable concentration (MAC) of 25 ?g/L for arsenic. A test column was set...
The Use of Built-Up Compression Members?A Fabricator's Viewpoint
A variety of cross-sections of built-up compression members that have been used are shown. Suggested items that need to be addressed for the successful design and fabrication are discussed....
Structural Design on Ductile Iron Pipe
The thickness class designation for Ductile Iron pipe has been changed to a pressure class designation in the 1991 revision of the C150/A21.50 ANSI standard. However, the same conservative...
Design of Pena Colorada Tailings Retention Dam
This paper discusses the details involved in the design of a 66 meter high RCC dam to be used to create storage for slurry from an iron ore mining operation located near Manzanillo, Mexico....
Production of Lunar Oxygen, Iron, Magnesium, and Silicon by Aqueous Hydrofluoric Acid Leaching
Aqueous hydrofluoric acid (HF) processing of lunar regolith offers the versatile options of lunar iron and oxygen production by room temperature electrolysis as well as the extraction...
Evaluation of Processing Options for Lunar Oxygen Production
Recent work on space resource utilization has lead to the identification of certain modifications of previously proposed processes which can be properly characterized as 'second generation'...
Metrication of Construction?A Message to the American Society of Civil Engineers
The author discusses the reasons for metrication of the U.S. construction industry, describes the Canadian experience in this area, and outlines the necessary steps to alleviate the metrication...
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