25 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Filtration"  
Results: 1 - 24 next
open access

Reducing Mortality from Terrorist Releases of Chemical and Biological Agents: I. Filtration for Ventilation Systems in Commercial Building

Description: There is growing concern about potential terrorist attacks involving releases of chemical and/or biological (CB) agents, such as sarin or anthrax, in and around buildings. For an external release, the CB agent can enter the building through the air intakes of a building's mechanical ventilation system and by infiltration through the building envelope. For an interior release in a single room, the mechanical ventilation system, which often recirculates some fraction of the air within a building,… more
Date: September 1, 1999
Creator: Thatcher, Tracy L. & Daisey, Joan M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ASSESSMENT OF THE PCFBC-EXPOSED AND ACCELERATED LIFE-TESTED CANDLE FILTERS

Description: Development of the hot gas filtration technology has been the focus of DOE/FETC and Siemens Westinghouse Power Corporation during the past twenty years. Systems development during this time has successfully lead to the generation and implementation of high temperature Siemens Westinghouse particulate filtration systems that are currently installed and are operational at Demonstration Plant sites, and which are ready for installation at commercial plant sites. Concurrently, materials development… more
Date: September 30, 1999
Creator: Alvin, M. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chemical Characterization of Soluble Phosphorus Forms along a Hydrologic Flowpath of a Forested Stream Ecosystem

Description: The concentration and distribution of soluble phosphorus (P) forms were determined in compartments of a hydrologic pathway in a forested watershed (Walker Branch, Tennessee). Rainfall, throughfall, soil water, groundwater, stream water, and water from two sites in Melton Hill reservoir downstream of Walker Branch were examined for soluble reactive and total soluble phosphorus (SRP and TSP). Soluble unreactive P (SUP) was determined from their difference. An increase of TSP from rainfall to thro… more
Date: January 1, 1999
Creator: Segars, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Silicon Nitride Membranes for Filtration and Separation

Description: Semi-Permeable silicon nitride membranes have been developed using a Bosch etch process followed by a reactive ion etch (NE) process. These membranes were observed to allow air but not water to pass through them into surface micromachined, silicon nitride microfluidic channels. Membranes with this property have potential use in microfluidic systems as gas bubble traps and vents, filters to remove particles and gas partitioning membranes. Membrane permeation was measured as 1.6 x 10{sup {minus}8… more
Date: July 19, 1999
Creator: Galambos, Paul; Zavadil, Kevin; Shul, Randy; Willison, Christi Gober & Miller, Sam
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Laboratory and Field Studies Related to Radionuclide Migration at the Nevada Test Site

Description: In this report, we describe the work done in FY 1998 at Los Alamos National Laboratory as part of the Hydrologic Resources Management Program (HRMA) funded by the Nevada Operations Office of the US Department of Energy (DOE/NV). The major part of our research effort was to measure radionuclides present in water or soil samples collected from near nuclear tests. We report our measurements for materials collected in both saturated and unsaturated horizons adjacent to nuclear test cavities or coll… more
Date: March 1, 1999
Creator: Martinez, B. A.; Finnegan, D. L.; Thompson, Joseph L. & Kung, K. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Removal of Metallic and Organic Contaminants from Aqueous Streams by Novel Filtration Methods

Description: Graphite nanofibers are a newly developed type of material that can be synthesized by the decomposition of selected hydrocarbons over selected metal particle surfaces 1. The structural characteristics of the solid can be manipulated by a careful selection of parameters including the catalyst, the reaction conditions and the temperature. Both the size and the morphology of the metal particle have been found to play an important role on the cross-sectional area as well as the orientation of the g… more
Date: June 1, 1999
Creator: Rodriguez, Nelly M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electrically Driven Technologies for Radioactive Aerosol Abatement

Description: The objective of this research program is to develop an improved understanding of how electrically driven processes, including electrocoalescence, acoustic agglomeration, and electric filtration, may be employed to efficiently treat problems caused by the formation of aerosols during DOE waste treatment operations. The production of aerosols during treatment and retrieval operations in radioactive waste tanks presents a significant problem of cost, worker exposure, potential for release, and in… more
Date: June 1, 1999
Creator: DePaoli, David W.; Ezekoye, O.A.; Tsouris, Costas & de Almeida, Valmor F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Colloidal Agglomerates in Tank Sludge: Impact on Waste Processing

Description: Insoluble colloidal sludges in hazardous waste streams such as tank wastes can pose serious problems for waste processing, interfering with retrieval, transport, separation, and solidification processes. Properties of sediment layers and sludge suspensions such as slurry viscosities, sedimentation rates, and final sediment densities can vary by orders of magnitude depending on the particle types present, the degree to which the particles agglomerate, and processing parameters such as shear rate… more
Date: June 1, 1999
Creator: Tingey, Joel M.; Martin, J. A. & Berg, John D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of airflow patterns in 2706-T and 2706-TA

Description: The purpose of this study was to evaluate the adequacy of the current placement of fixed head air samplers and continuous air monitors (CAMs) in the 2706-T and 2706-TA Complex. The airflow study consisted of 6 configurations of facility HVAC and HEPA filtration equipment to determine impacts on CAM location. The results of this study provide recommendations based on guidance in DOE G 411.1-8 and NUREG-1400 for placement of fixed head air samplers or CAMS within 2706-T and 2706-TA.
Date: August 26, 1999
Creator: Derosa, D. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radioactive air emissions notice of construction debris removal 105-KE basin

Description: The 105-KE Basin contains 1,150 Metric Tonnes of Uranium (MTU) of N Reactor fuel, along with less than half a MTU of single pass reactor (SPR) fuel. In addition to the spent nuclear fuel (SNF) in the 105-KE Basin, extensive quantities of debris and a substantial amount of sludge have accumulated in the basin. The 105-KE Basin fuel and sludge are not encapsulated and, as a result, corroding fuel has produced contamination products that are deposited on the basin walls, floor, and equipment. cont… more
Date: October 6, 1999
Creator: HAYS, C.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DEVELOPMENT AND TESTING OF A CERIA-ZIRCONIA TOUGHENED ALUMINA PROTOTYPE FILTER ELEMENT MADE OF RETICULATED CERAMIC FOAM COATED WITH A CERAMIC MEMBRANE ACTING AS BARRIER FILTER FOR FLY ASH

Description: The objective of this work was to fabricate subscale candle filters using a Ce-ZTA reticulated foam material. Specifically Selee fabricated 60mm diameter cylinders with one closed end and one flanged end. Selee Corporation developed a small pore size (5-10 {micro}m) filtration membrane which was applied to the reticulated foam surface to provide a barrier filter surface. The specific tasks to be performed were as follows: (Task 1) Filter Element Development--To fabricate subscale filter element… more
Date: February 19, 1999
Creator: Rossi, Guilio A.; Butcher, Kenneth R. & Wagner, Stacia M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis of New Water-Soluble Metal-Binding Polymers: Combinatorial Chemistry Approach

Description: (1) Develop rapid discovery and optimization approaches to new water-soluble chelating polymers for use in Polymer Filtration (PF) systems and (2) evaluate the concept of using water and organic soluble polymers as new ''solid'' supports for combinatorial synthesis.
Date: June 1, 1999
Creator: Smith, Barbara F.; Miller, R. Bryan; Kurth, Mark J. & Sawan, Samuel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

RECOVERY OF MERCURY FROM CONTAMINATED LIQUID WASTES

Description: Mercury was widely used in U.S. Department of Energy (DOE) weapons facilities, resulting in a broad range of mercury-contaminated wastes and wastewaters. Some of the mercury contamination has escaped to the local environment, particularly at the Y-12 Plant in Oak Ridge, Tennessee, where approximately 330 metric tons of mercury were discharged to the environment between 1953 and 1963 (TN & Associates, 1998). Effective removal of mercury contamination from water is a complex and difficult problem… more
Date: September 29, 1999
Creator: Stewart, Robin M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Iodine Revolatilization in a Grand Gulf Loca

Description: The TRENDS models are applied at each time step to each control volume. Significant amounts of water occur only in the wetwell and drywell sump (the refueling pool is not a factor, as discussed earlier). In Fig. 2, we show the radiolytic acid production feeding into each of these pools. Since the water is initially neutral and no chemical additives are present, the acid additions are the major factors affecting pH. In Fig. 3, we see the downward trend of pH resulting from these acid additions. … more
Date: January 1, 1999
Creator: Beahm, E.C. & Weber, C.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Continuous concentration and constant volume washing of tetraphenylborate slurries

Description: SRTC has completed filtration testing of tetraphenylborate (TPB) slurries with and without sludge. These tests were slightly different from previous SRS tests in that they used continuous mode concentration and constant volume washing evolutions. The extent of TPB recovery during washing was measured. The resulting washed precipitate slurry, with sludge, was stored at ambient temperature and under a nitrogen-inerted atmosphere to study TPB stability. Samples of both unwashed and washed slurries… more
Date: December 8, 1999
Creator: Siler, J.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Condensation pressures in small pores: An analytical model based on density functional theory

Description: Adsorption and condensation are critical to many applications of porous materials including filtration, separation, and the storage of gases. Integral methods are used to derive an analytical expression describing fluid condensation pressures in slit pores bounded by parallel plane walls. To obtain this result, the governing equations of Density Functional Theory (DFT) are integrated across the pore width assuming that fluid densities within adsorbed layers are spatially uniform. The thickness,… more
Date: February 1, 1999
Creator: Nilson, R. H. & Griffiths, S. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Adsorption/Membrane Filtration as a Contaminant Concentration and Separation Process for Mixed Wastes and Tank Wastes - Final Report

Description: This project was conducted to evaluate novel approaches for removing radioactive strontium (Sr) and cesium (Cs) from the tank wastes. The bulk of the Sr removal research conducted as part of this project investigated adsorption of Sr onto a novel adsorbent known as iron-oxide-coated sand. The second major focus of the work was on the removal of cesium. Since the chemistries of strontium and cesium have little commonality, different materials (namely, cesium scavengers known as hexacyanoferrates… more
Date: October 1, 1999
Creator: Benjamin, M.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Technology development for iron and cobalt Fischer-Tropsch catalysts

Description: The simple polymerization mechanism for the Fischer-Tropsch synthesis produces products which follows an Anderson-Schulz-Flory distribution. Thus, plotting the logarithm of the mole fraction versus carbon number will produce a straight line whose slope is related to alpha which is determined by the chain termination and propagation probabilities. In contrast, the products from laboratory and large commercial plants exhibit a two-alpha plot. Vapor-liquid calculations show that product accumulati… more
Date: July 31, 1999
Creator: Davis, B. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

POC-SCALE TESTING OF AN ADVANCED FINE COAL DEWATERING EQUIPMENT/TECHNIQUE

Description: Dewatering of ultra-fine (minus 150 {micro}m) coal slurry to less than 20% moisture is difficult using the conventional dewatering techniques. The main objective of the project was to evaluate a novel surface modification technique, which utilizes the synergistic effect of metal ions and surfactants in combination for the dewatering of ultra-fine clean-coal slurries using various dewatering techniques on a proof-of-concept (POC) scale of 0.5 to 2 tons per hour. The addition of conventional reag… more
Date: August 1, 1999
Creator: Wang, X. H.; Wiseman, J.; Sung, D. J.; McLean, D.; Peters, William; Mullins, Jim et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CENTRIFUGAL MEMBRANE FILTRATION

Description: The overall project consists of several integrated research phases related to the applicability, continued development, demonstration, and commercialization of the SpinTek centrifugal membrane filtration process. Work performed during this reporting period consisted of Phase 2 evaluation of the SpinTek centrifugal membrane filtration technology and Phase 3, Technology Partnering. During Phase 1 testing conducted at the EERC using the SpinTek ST-IIL unit operating on a surrogate tank waste, a so… more
Date: October 1, 1999
Creator: Stepan, Daniel J.; Stevens, Bradley G. & Hetland, Melanie D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ADVANCED HYBRID PARTICULATE COLLECTOR

Description: A new concept in particulate control, called an advanced hybrid particulate collector (AHPC), is being developed under funding from the U.S. Department of Energy. The AHPC combines the best features of electrostatic precipitators (ESPs) and baghouses in a manner that has not been done before. The AHPC concept consists of a combination of fabric filtration and electrostatic precipitation in the same housing, providing major synergism between the two collection methods, both in the particulate co… more
Date: July 1, 1999
Creator: Schelkoph, Grant L. & Miller, Stanley J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cold Vacuum Drying facility HVAC system design description (SYS 30-1 THRU 30-5)

Description: This document describes the Cold Vacuum Drying Facility (CVDF) heating, ventilation, and air conditioning system (HVAC). The CVDF HVAC system consists of the Administrative building HVAC system, the process bay recirculation HVAC system, the process bay local HVAC and process vent system, the process general supply/exhaust HVAC system, and the Reference air system. These HVAC sub-systems support the CVDF process and provide secondary confinement of contamination and the required filtration of e… more
Date: July 2, 1999
Creator: PITKOFF, C.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen