Academic literature on the topic 'Teledyne Wah Chang Albany'

Abstract Ti-45 Niobium offers resistance to oxidizing media, including reduced pyrophoric, and ignition characteristics. Applications include aqueous pressure oxidation of ores. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. Filing Code: TI-106. Producer or source: Teledyne Wah Chang Albany.

Abstract HAFNIUM is a commercially available refractory metal which has outstanding corrosion resistance, good mechanical properties, and is readily amenable to standard fabrication techniques. These characteristics, coupled with its high thermal-neutron cross section, high-temperature allotropic transformation, and excellent electrical properties, have made it of increasing interest to design engineers in a variety of fields. This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties. It also includes information on corrosion resistance as well as machining and joining. Filing Code: HF-1. Producer or source: Teledyne Wah Chang Albany.

The Teledyne Wah Chang facility is a manufacturer of the rare metal zirconium. The facility has been in constant production since 1956. In 1973 an attempt to utilize different sand ore sources from Nigeria and India in a new carbiding process, prior to chlorination, failed. The resulting byproducts of the carbiding process and approximately 2000 kg of zircon sand ore were lost in what is now called the Former Sand Unloading Area. In 1982, Teledyne Wah Chang facility was listed as a Superfund site. The Former Sand Unloading Area was contaminated with naturally-occurring radioactive material. After being listed, Teledyne Wah Change began the Remedial Investigation / Feasibility Study process in an attempt to cleanup the Former Sand Unloading Area and other contaminated sites. Afterwards, it was discovered that the remediation goals for the Former Sand Unloading Area only addressed exposure pathways to current workers on site. No consideration had been given to possible future occupants under long term exposure scenarios. In this study, three scenarios were modeled to illustrate the most plausible occupancy uses of the Former Sand Unloading Area. The scenarios were: current industrial worker, commercial worker, and a residential occupant. The pathways that were used to model the exposure scenarios were, direct external radiation, inhaled and ingested soil, and plant consumption. The RESRAD computer code was used to estimate the dose rates to current and future occupants working or living on the Former Sand Unloading Facility. The maximum resulting radiation dose received was 16.7 mrem y����� for the industrial worker scenario. The lowest maximum radiation dose received was 13.6 mrem y����� for the commercial worker scenario. The most conservative assumptions and efforts were used to ensure the maximum dose rate was modeled. The maximum radiation dose rate received at the Former Sand Unloading Area was below the regulatory maximum allowable exposure limit of 25 mrem y�����.
Graduation date: 2002

The primary objective of this study was to evaluate the rates of nitrate removal for a nitrate containing, low organic carbon wastewater interacting with four different carbon-containing solid substrates (alder woodchips, corn silage, manure and woodchip biochar). Batch systems were tested for nitrate removal, and systems with a combination of three carbon substrates (75% woodchips, 12.5% silage, and 12.5% manure or woodchip biochar by mass) produced average nitrate removal rates of 571 and 275 mg-N L⁻¹ D⁻¹, and systems containing the carbon substrates individually produced rates between 11.4 - 3.3 mg-N L⁻¹ D⁻¹. Silage proved to be the dominant carbon substrate providing high quantities of organic carbon to fuel denitrification. With the introduction of semi-continuous flow, all systems had nitrate removal rates that converged to 13.3 – 6.4 mg-N L⁻¹ D⁻¹, which is approximately two orders of magnitude smaller than the rates of the mixture systems in the batch experiment. Silage appeared to be removed from of the systems with liquid exchange potentially causing the rate decreases. Columns filled with various volume fractions of woodchips (100%, 25%, 12.5%, and 0%) produced nitrate removal rates between 30.8 – 2.4 mg-N L⁻¹ D⁻¹ at a 24 hour and 12 hour hydraulic residence time (HRT). Greater nitrate removal was achieved with higher HRTs and larger fractions of woodchips (the 100% woodchip system at a 24 hour HRT produced the fastest nitrate removal rate of 30.8 mg-N L⁻¹ D⁻¹). When rates were normalized to the amount of woodchips in each column, higher efficiency was found in lower woodchip fraction systems (the 12.5% woodchip column produced the highest normalized nitrate removal rate of 56 mg-N L⁻¹ D⁻¹ L[subscript woodchips]⁻¹). Woodchips proved to be best suited as a long term carbon substrate for nitrate removal in a system containing a nitrate concentrated, low organic carbon wastewater. However, large amounts of woodchips were necessary to achieve nitrate removal greater than 50%. A 41 acre hypothetical wetland with a 3.3 day HRT and a nitrate influent concentration of 45 mg-N L⁻¹ would require 30,000 yd³ of woodchips to achieve 68% nitrate removal based on the values obtained in the bench scale column experiment.
Graduation date: 2012