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BIOFILTRATION OF VOLATILE POLLUTANTS: Fundamental Mechanisms for Improved Design, Long-term Operation, Prediction, and Implementation
Biofiltration systems can be used for treatment of volatile organic compounds (VOCs); however, the systems are poorly understood and are normally operated as ''black boxes''. Common operational problems associated with biofilters include fouling, deactivation, and overgrowth, all of which make them ineffective for continuous, long-term use. The objective of this investigation was to develop generic methods for long-term stable operation, in particular by using selective limitation of supplemental nutrients while maintaining high activity. As part of this effort, we have provided a deeper fundamental understanding of the important biological and transport mechanisms in biodestruction of sparingly soluble VOCs and have extended this approach and mathematical models to additional systems of high priority EM relevance--direct degradation and cometabolic degradation of priority pollutants such as BTEX and chlorinated organics. Innovative aspects of this project included development of a user-friendly two-dimensional predictive model/program for MS Windows 95/98/2000 to elucidate mass transfer and kinetic limitations in these systems, isolation of a unique microorganism capable of using sparingly soluble organic and chloroorganic VOCs as its sole carbon and energy source, and making long-term growth possible by successfully decoupling growth and degradation metabolisms in operating trickle bed bioreactors.
Date:
December 31, 2000
Creator:
Davison,Brian H.
Object Type:
Report
System:
The UNT Digital Library
Enhanced Oil Recovery with Downhole Vibration Stimulation in Osage County Oklahoma
None
Date:
December 31, 2000
Creator:
Brett, J. Ford & Westermark, Robert V.
Object Type:
Report
System:
The UNT Digital Library
A Hybrid Hydrologic-Geophysical Inverse Technique For The Assessment And Monitoring Of Leachates In The Vadose Zone
At many DOE facilities, the presence of radioactive wastes and other contaminants within the vadose zone poses a serious and ongoing threat to public health and safety. In many cases these contaminants have been introduced directly to the vadose zone through releases on the surface or in shallow pits, and through leaking storage facilities. To reduce the environmental risks these wastes pose, the DOE is currently considering two fundamentally different approaches. The first involves remediation by treating contaminants in-place while the second, and more economically feasible being examined by DOE, involves in-situ immobilization of the wastes. Immobilization would be achieved through both injection of subsurface grout barriers to block transport pathways and installation of surface caps to prevent additional water infiltration into contaminated formations. A necessary requirement of both remediation approaches is the need to obtain information on the spatial distributions of the hydraulic and transport properties, the amount of contamination in place, and flow and transport processes that are occurring. With this information in hand, informed decisions can be made in order to optimize the remediation process for each particular case. In particular, these capabilities could result in reduced remediation costs, as well as providing necessary data to illustrate …
Date:
December 31, 2000
Creator:
Alumbaugh, David L.
Object Type:
Report
System:
The UNT Digital Library
USE OF SONICATION FOR IN-WELL SOFTENING OF SEMIVOLATILE ORGANIC COMPOUNDS
This project investigates the in-situ degradation of semivolatile organic compounds (SVOCs) and volatile organic compounds (VOCs) using in-well sonication, in-well vapor stripping, and bioremediation. Pretreating groundwaters with sonication techniques in-situ would form VOCs that can be effectively removed by in-well vapor stripping and bioremediation. The mechanistic studies focus on the coupling of megasonics and ultrasonics to ''soften'' (i.e., partially degrade) the SVOCs; oxidative reaction mechanism studies; surface corrosion studies (on the reactor walls/well); enhancement due to addition of oxidants, quantification of the hydroxyl radical formation; identification/quantification of degradation products; volatility/degradability of the treated waters; development of a computer simulation model to describe combined in-well sonication/in-well vapor stripping/bioremediation; systems analysis/economic analysis; large laboratory-scale experiment verification; and field demonstration of the integrated technology. Benefits of this approach include: (1) Remediation is performed in-situ; (2) The treatment systems complement each other; their combination can drastically reduce or remove SVOCs and VOCs; (3) Ability to convert hard-to-degrade organics into more volatile organic compounds; (4) Ability to remove residual VOCs and ''softened'' SVOCs through the combined action of in-well vapor stripping and biodegradation; (5) Does not require handling or disposing of water at the ground surface; and (6) Cost-effective and improved efficiency, resulting in shortened …
Date:
December 31, 2000
Creator:
Peters, Robert W.
Object Type:
Report
System:
The UNT Digital Library
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Friday, December 29, 2000
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
December 29, 2000
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 105, No. 104, Ed. 1 Friday, December 29, 2000
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
December 29, 2000
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Dallas Voice (Dallas, Tex.), Vol. 17, No. 35, Ed. 1 Friday, December 29, 2000
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
December 29, 2000
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
Pacific Northwest National Laboratory Institutional Plan FY 2001-2005
The Pacific Northwest National Laboratory Institutional Plan for FY 2001-2005 sets forth the laboratory's mission, roles, technical capabilities, and laboratory strategic plan. In the plan, major initiatives also are proposed and the transitioning initiatives are discussed. The Programmatic Strategy section details our strategic intent, roles, and research thrusts in each of the U.S. Department of Energy's mission areas. The Operations/Infrastructure Strategic Plan section includes information on the laboratory's human resources; environment, safety, and health management; safeguards and security; site and facilities management; information resources management; managaement procatices and standards; and communications and trust.
Date:
December 29, 2000
Creator:
Fisher, Darrell R. & Pearson, Erik W.
Object Type:
Report
System:
The UNT Digital Library
Texas Register, Volume 25, Number 52, Pages 12863-13066, December 29, 2000
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
December 29, 2000
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 110, No. 52, Ed. 1 Thursday, December 28, 2000
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
December 28, 2000
Creator:
Ezzell, Nancy & Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 19, No. 46, Ed. 1 Thursday, December 28, 2000
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
December 28, 2000
Creator:
Reeves, Tim
Object Type:
Newspaper
System:
The Portal to Texas History
FFTF Final Safety Analysis Report Amendment 80 [SEC 1 and 2 and 3]
None
Date:
December 28, 2000
Creator:
GANTT, D.A.
Object Type:
Report
System:
The UNT Digital Library
Tank Waste Remediation System (TWRS) Final Safety Analysis Report (FSAR)
None
Date:
December 28, 2000
Creator:
KRIPPS, L.J.
Object Type:
Report
System:
The UNT Digital Library
The Llano News (Llano, Tex.), Vol. 113, No. 12, Ed. 1 Wednesday, December 27, 2000
Weekly newspaper from Llano, Texas that includes local, state, and national news along with advertising.
Date:
December 27, 2000
Creator:
Stephenson, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History
The Mercedes Enterprise (Mercedes, Tex.), Vol. 88, No. 52, Ed. 1 Wednesday, December 27, 2000
Weekly newspaper from Mercedes, Texas that includes local, state, and national news along with advertising.
Date:
December 27, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The distribution of an illustrated timeline wall chart and teacher's guide of 20th century physics
The American Physical Society's part of its centennial celebration in March of 1999 decided to develop a timeline wall chart on the history of 20th century physics. This resulted in eleven consecutive posters, which when mounted side by side, create a 23-foot mural. The timeline exhibits and describes the millstones of physics in images and words. The timeline functions as a chronology, a work of art, a permanent open textbook, and a gigantic photo album covering a hundred years in the life of the community of physicists and the existence of the American Physical Society. Each of the eleven posters begins with a brief essay that places a major scientific achievement of the decade in its historical context. Large portraits of the essays' subjects include youthful photographs of Marie Curie, Albert Einstein, and Richard Feynman among others, to help put a face on science. Below the essays, a total of over 130 individual discoveries and inventions, explained in dated text boxes with accompanying images, form the backbone of the timeline. For ease of comprehension, this wealth of material is organized into five color-coded story lines the stretch horizontally across the hundred years of the 20th century. The five story lines …
Date:
December 26, 2000
Creator:
Schwartz, Brian
Object Type:
Report
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 95, No. 102, Ed. 1 Friday, December 22, 2000
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
December 22, 2000
Creator:
Keasling, Edna & Thompson, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Friday, December 22, 2000
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
December 22, 2000
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 105, No. 102, Ed. 1 Friday, December 22, 2000
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
December 22, 2000
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Dallas Voice (Dallas, Tex.), Vol. 17, No. 34, Ed. 1 Friday, December 22, 2000
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
December 22, 2000
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
Archer County News (Archer City, Tex.), No. 51, Ed. 1 Thursday, December 21, 2000
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
December 21, 2000
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 110, No. 51, Ed. 1 Thursday, December 21, 2000
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
December 21, 2000
Creator:
Ezzell, Nancy & Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Chronicles of Oklahoma, Volume 78, Number 4, Winter 2000-01
Quarterly publication containing articles, book reviews, photographs, illustrations, and other works documenting Oklahoma history and preservation. Index to volume 78 starts on page 514.
Date:
Winter 2000
Creator:
Oklahoma Historical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Gateway to Oklahoma History
Heritage, Volume 18, Number 1, Winter 2000
Quarterly publication containing articles related to the preservation of historic artifacts and sites in Texas. Feature articles discuss various aspects of Texas history and heritage, often highlighting museums and collections within the state. Also included are book reviews, current preservation news, and a listing of historical museums in Texas.
Date:
Winter 2000
Creator:
Texas Historical Foundation
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History