| Assessment of the Performance of Iodine-Treated Biocidal Filters and Characterization of Virus Aerosols |
Jul-2009 |
142 pages |
| Authors:
Jin-Hwa Lee; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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 | Enhanced awareness of the threat of biological warfare and the spread of airborne pathogens has stimulated interest in bioaerosols and the need to develop better methods for respiratory protection. Among pathogens, viruses and bacterial spores are of special concern because they exhibit resistance to inactivation, small (highly penetrating) particle size and low median infectious dose. This study compared the mechanical and total viable removal by a relatively inefficient (N50) iodine-treated ... |
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| Characterization of Reaerosolization From Impingers in an Effort to Improve Airborne Virus Sampling |
Apr-2009 |
35 pages |
| Authors:
Jin-Hwa Lee; Chang-Yu Wu; Lindsey M Riemenschnelder; Dale A Lundgren; Hsing-Wang Li; Joseph D Wander; Brian K Heimbuch; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| An AGI-30 impinger containing particles (MS2 bacteriophage or 30-nm polystyrene latex (PSL)) of known concentration was operated with sterile air. Reaerosolized particles as a function of sampling flow rate and impinge collection liquid concentration were characterized using a Scanning Mobility Particle Sizer. Reaerosolization from the impinge was also compared to that from a BioSampler. Results show that the reaerosolization increases as flow rate increases. While the increased particle concentration in ... |
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| Assessment of Iodine-treated Filter Media for Removal and Inactivation of MS2 Bacteriophase Aerosols |
Apr-2009 |
40 pages |
| Authors:
Samuel Farrah; Jin-Hwa Lee; Chang-Yu Wu; Dale A Lundgren; Joseph D Wander; Brian K Heimbuch; Christiana N Lee; Diandra Anwar; Katherine M Wysocki; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| The filter's physical (PRE) and viable removal efficiencies (VRE) were investigated with challenges of MS2 bacteriophage aerosols, and the infectivity of MS2 collected on the filter was analyzed. To test a proposed inactivation mechanism, media containing thiosulfate or bovine serum albumin (BSA) were put in impingers to quench and consume I2 released from the filter. In direct plating experiments, treated filters presented significantly higher VREs than did untreated filters; however, ... |
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| Characterization of Reaerosolization in an Effort to Improve Sampling of Airborne Viruses |
01-Apr-2008 |
107 pages |
| Authors:
Lindsey Riemenschneider; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Airborne virus outbreaks, including the influenza pandemic of 1918, the recent SARS pandemic and the anticipated H5N1 outbreak, plus the perceived threat of bioterrorism warrant concern about the prevalence and potential effects of airborne viruses. However, current bioaerosol sampling methods do not effectively sample airborne viruses (typically 20 - 300 nm). To address this problem, a novel Bioaerosol Amplification Unit (BAU) has been designed and constructed to increase the size ... |
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| Effect of Environmental Parameters on the Biocidal Performance of Iodine-Treated Filters |
JAN 2008 |
85 pages |
| Authors:
Chang-Yu Wu; Jin-Hwa Lee; Lindsey Reiemenschneider; Alexandros D. Theodore; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Iodine-treated filter media were challenged at a face velocity of 14.2 cm/s by Bacillus subtilis spores and MS2 bacteriophage aerosols generated from a Collison nebulizer. The novel medium displayed excellent viable removal efficiency (VRE) for bacterial spores with a negligible pressure drop in various environmental conditions, suggesting an alternative to HEPA filters for the removal of bacterial spore aerosols. Different filter media tested for viral aerosols showed VRE >90% but ... |
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| Evaluation of Physical Capture Efficiency and Disinfection Capability of a Novel Iodinated Filter Medium |
DEC 2006 |
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| Authors:
Shanna Ratnesar; Chang-Yu Wu; Joe Wander; Dale Lundgren; Sam Farrah; Prinda Wanakule; Matthew Blackburn; Mei-Fang Lan; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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 | A novel filter medium has been developed that combines the use of filtration and iodine disinfection to provide protection against airborne pathogens. The physical capture efficiency and disinfection capability of this iodinated resin medium were evaluated. Significant capture efficiency (>97%) was observed for both the iodine-treated and untreated media tested, and there was no significant difference in capture efficiency between them. The efficiency was greater than 99% in many cases. ... |
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| Evaluation of the Performance of Iodine-Treated Biocide Filters Challenged with Bacterial Spores and Viruses |
NOV 2006 |
64 pages |
| Authors:
Jin-Hwa Lee; Chang-Yu Wu; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Filter media coated with a cationic resin in triiodide form were challenged by Bacillus subtilis spores and MS2 bacteriophage aerosols delivered from a Collison nebulizer through air at 35% RH and 23 C at 14.2 cm/s face velocity. Bacteria were classified and collected in a 6-stage Andersen impactor; serially connected AGI-30 impingers were used in phage experiments. Average bacterial removal efficiency was 99.9991% for untreated (UM) and 99.9994% for treated ... |
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| Effect of Porous Media and Fluid Properties on Dense Non-Aqueous Phase Liquid Migration and Dilution Mass Flux |
AUG 2005 |
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| Authors:
Christian T. Totten; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| The influence of porous media and fluid properties on Non Aqueous Phase Liquid (NAPL) residual geometry and associated contaminant mass flux characteristics was investigated. Contaminant mass flux is a function of the source zone cross sectional area exposed to groundwater flow. Porous media and fluid properties affect source zone morphology leading to cross sectional area development. Media grain size and NAPL wettability were varied for relative comparisons. Fluid properties including ... |
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| Capture of Aerosols by Iodinated Fiber Media |
15 SEP 2004 |
57 pages |
| Authors:
Shanna Ratnesar-Shumate; Prinda Wanakule; C. Y. Wu; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Discs of a synthetic fiber medium, before and (in two thicknesses) after coating with finely divided particles of poly(styrene-trimethylammonium iodide) (Triosyn-Registered) resin, were challenged with an aerosol generated by atomizing an aqueous solution of ammonium fluorescein. A six-stage Andersen impactor was used to classify the particles penetrating each of these media and a fiberglass control medium. The coating on each stage was phased between water and methylene chloride to separate ... |
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| Tracer Techniques for DNAPL Source Delineation and In-Situ Flushing Techniques for Enhanced Source Removal: Pilot Scale Demonstrations at the Dover National Test Site |
15 SEP 2001 |
293 pages |
| Authors:
Michael C. Brooks; Michael D. Annable; Suresh C. Rao; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| The objective of this study was to evaluate the performance of innovative tracer techniques for dense nonaqueous phase liquid (DNAPL) characterization and in-situ cosolvent and surfactant flushing for DNAPL removal in an isolated test cell (3.0m x 4.5m x 1 2.3m) located at the Dover National Test Site, Dover AFB, DE. As part of a larger project to assess the performance of several in-situ flushing technologies for DNAPL source removal, ... |
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| Solubilization and Mobilization of Perchloroethylene by Cosolvents in Porous Media |
28 JUL 1999 |
187 pages |
| Authors:
Michael E. Van Valkenburg; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Batch equilibrium studies conducted for perchloroethylene (PCE)/ cosolvent systems determined that the log-linear solubility relationship is not a completely accurate method to predict solubility of PCE in cosolvent mixtures over an entire range of volume fractions. Batch studies resulted in cosolvency powers of 3.73 and 4.13 for ethanol and isopropanol, respectively. However, log- linear predictions may be adequate for estimations necessary for remediation efforts. The use of the Extended Hildebrand ... |
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| Characterization of the Uptake of Nitrogen Oxides on Alumina Adsorbents |
MAY 1999 |
162 pages |
| Authors:
David A. Pocengal; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| The objective of this research was to develop a method that employed ion-specific electrodes (ISEs) to quantify nitrate and nitrite (NOx) in aqueous solutions that contained NOx exposed alumina and to correlate the quantities of these surface NOx species with the quantity of gaseous NOx sorbed. The final objective was to obtain material balances of NOx sorbed to nitrate and nitrite formed and to observe indicative relationships between the surface ... |
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| A Study of Leachate Generated from Construction and Demolition Landfills |
02 AUG 96 |
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| Authors:
Beth A. Melendez; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Construction and demolition (C&D) waste landfills have largely been ignored because they have been viewed as innocuous in comparison to municipal solid waste (MSW) landfills and hazardous waste landfills. Regulators felt that since C&D landfills did not accept large quantities of hazardous waste and the waste was relatively stable in comparison to MSW, these landfills did not pose a threat to the environment. Thus, little is known about leachate generated ... |
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| Academic Interface at the New University of Florida Water Reclamation Facility |
01 MAY 92 |
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| Authors:
John D. Puglisi; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Recent planning studies at the University of Florida have shown substantial changes in the wastewater treatment facilities are required to meet current environmental water quality standards. The age of existing wastewater treatment plant and the maintenance problems inherent with a 40 year old process facility mandated the construction of a new wastewater treatment facility. The existing wastewater treatment plant consists of a contact stabilization activated sludge process and trickling filter ... |
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| Alachua County Southwest Landfill Gas Production as a Function of Time |
MAY 92 |
111 pages |
| Authors:
Gerald R. Manley; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Refuse disposal is an issue that must be addressed by virtually every community in the country. In the last twenty years, the demand for disposal techniques that minimize impact on the environment has increased. In addition, there has been a heightened interest in energy recovery from wastes as a method to reduce both the cost of waste disposal and national dependence on foreign energy supplies. The most common method of ... |
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| Design and Calibration of an In-Stack, Low-Pressure Impactor |
MAR 89 |
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| Authors:
D. A. Lundgren; R. W. Vanderpool; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| The purpose of this project was to design, fabricate, calibrate, and field test a low-pressure impactor for sampling and size classifying particulate exhaust from jet engine test cells. This report covers all aspects of the effort through an actual field test on a J79 type engine exhaust. A computer code for user prediction of impactor stage outputs is included as well as design drawings for impactor fabrication. Keywords: Combustion products; ... |
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| Kinetics and Degradation Products of Trichloroethene |
MAY 86 |
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| Authors:
Gabriel Bitton; Joseph J. Delfino; Patricia V. Cline; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Existing literature was reviewed to identify proposed or demonstrated instances of degradation of trichloroethene (trichloroethylene or TCE) by biological or abiotic mechanisms. The information was evaluated for possible future research into abiotic degradation mechanisms, thereby, increasing our understanding of in situ processes occuring in TCE-contaminated sites providing alternate treatment technologies. |
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| Feasibility Study: Liquid-Liquid Extraction (LLX) as a Cleanup Process for Groundwater, Soils and CBW (Chemical and Biological Warfare) Agents |
JAN 85 |
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| Authors:
J. Zoltek Jr.; J. F. K. Earle; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| A feasibility study was conducted to assess the potential application of liquid-liquid extraction (LLX) to the treatment of groundwater and soil contaminated by organic solvents and CBW agents. The study entailed a review of current literature relating to the use of the LLX in the treatment of various waste streams. No laboratory work was undertaken. Although the potential of utilizing this process as a cleanup technique has been established for ... |
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| Large-Scale Operations Management Test of Use of the White Amur for Control of Problem Aquatic Plants. Report 2. First Year Poststocking Results. Volume IV. Nitrogen and Phosphorus Dynamics of the Lake Conway Ecosystem: Loading Budgets and a Dynamic Hydro |
AUG 1982 |
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| Authors:
Eldon C. Blancher; Charles R. Fellows; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| An integrated nutrient budget for Lake Conway, Florida, was developed that integrated physical, chemical, and biological relationships. A hydrologic budget was constructed from measurements of stormwater runoff, subsurface seepage flows, and existing precipitation and evaporation data. It was determined that major sources of external nitrogen and phosphorus loadings were from atmospheric loadings, urban runoff, and subsurface seepage. Based upon a simulation model of the phosphorus dynamics of Lake Conway, it ... |
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| Large-Scale Operations Management Test of Use of the White Amur for Control of Problem Aquatic Plants. Report 2. First Year Poststocking Results. Volume III. The Plankton and Benthos of Lake Conway, Florida |
NOV 1981 |
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| Authors:
Thomas L. Crisman; Floor M. Kooijman; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| This report presents the results of studies documenting the first poststocking year for measuring the effect of the white amur on the aquatic vegetation of Lake Conway, Florida. It includes information on the plankton, benthos, and zooplankton in Lake Conway and summarizes temporal fluctuations in these parameters from the prestocking, base period. Due to temporary program limitations existing at the time, periphyton data for the first 6 months of the ... |
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| An 'In-Stack' Diffusion Classifier for Aerosol Mass Distribution Measurement |
APR 1981 |
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| Authors:
Dale A. Lundgren; Cumbum N. Rangaraj; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| A five-stage, screen-type diffusion classifier was designed and built to make in-situ measurement of submicron aerosols at temperatures and pressures encountered in industrial-type exhaust stacks. Laboratory calibration proceeded satisfactorily and held strong promise of successful field demonstration. However, major problems were encountered in test procedures during both field tests (at the Jacksonville Florida Electric Authority (J.E.A.)) Southside generating Station, Unit 4 (oil-fired boiler) and the Naval Air Rework Facility, Jacksonville, ... |
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| Field Test of an In-Stack Diffusion Classifier on an Aircraft Engine Test Cell |
APR 1981 |
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| Authors:
Dale A. Lundgren; Brian J. Hausknecht; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| An in-stack diffusion classifier was field tested at Tyndall Air Force Base, Florida. Particle size distribution measurements were made on the exhaust stream from the engine test cell while running a J75-P17 jet engine. Samples were collected at the test cell exhaust plane using a University of Washington in-stack cascade impactor followed, in series, by an in-stack diffusion classifier being developed at University of Florida. In addition, total particulate samples ... |
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| Large-Scale Operations Management Test of Use of the White Amur for Control of Problem Aquatic Plants; Report 1. Baseline Studies. Volume IV. Interim Report on the Nitrogen and Phosphorus Loading Characteristics of the Lake Conway, Florida, Ecosystem. |
JUN 1979 |
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| Authors:
Eldon C. Blancher III; Charles R. Fellows; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Preliminary estimates of external nutrient loadings to the three lakes that comprise the Lake Conway system showed nitrogen inputs (3.88 g/sq m/yr) that exceeded established critical levels for lakes. Phosphorus loadings (0.214 g/sq m/yr) were slightly below the range of critical loadings for the system. These loadings would indicate that the Lake Conway system should exhibit a mesotrophic character. Loading levels established for the individual lakes showed higher loadings to ... |
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| Large-Scale Operations Management Test of Use of the White Amur for Control of Problem Aquatic Plants; Report 1: Baseline Studies. Volume III. The Plankton and Benthos of Lake Conway, Florida. |
MAY 1979 |
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| Authors:
Roger Conley; Eldon C. Blancher II; Floor Kooijman; Charles Ferrick; Jackson L. Fox; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Monthly monitoring of the phytoplankton, periphyton, zooplankton, and benthic invertebrates of Lake Conway, Florida, indicates that no serious water quality problems were present prior to introduction of the Chinese Grass Carp (Ctenopharyngodon idella) for the biological control of aquatic macrophytes. The phytoplankton community is dominated by green algae (Chlorophyta) during most of the year, with the exception of summer and early fall when blue-greens (Cyanophyta) become abundant. Maximum algal abundance ... |
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| The Feasibility of Controlling Turbine Engine Test Cell Particulate Emissions with a Baghouse. |
SEP 1978 |
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| Authors:
John R. Geiger; Peter S. Daley; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Air pollution regulations dictate that the Department of Defense attempt to control visible emissions emitted from turbine engine test cells. Previous studies have summarily dismissed baghouses as a control device because of potential size, pressure drop, explosion and fire hazard, and excessive cost. This report addresses these problems in the design of a baghouse for controlling emissions from a TF30-P100 engine. |
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| Socio-Economic Studies of the Upper St. Johns River Basin, Central and Southern Florida Flood Control District. |
JUL 1974 |
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| Authors:
James P. Heaney; Wayne C. Huber; Roy Burke III; Philip B. Bedient; George J. Butkovich; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Procedures for assessing the technical, economic, social, and environmental aspects of the proposed Upper St. Johns water resources project are presented. Following the presentation of a general framework for water resources investigations, the social aspects of the problem are examined using field survey procedures combined with a simulation model. The economic-environmental planning analysis is performed using a multi-objective mathematical programming model. Energy productivity is used as a surrogate for environmental ... |
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| A Tracer Study of Meteorological Influence on the Dispersion of Ground-Applied Insecticide Aerosols. |
AUG 1973 |
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| Authors:
John F. Schatmeyer; Paul Urone; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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| Dispersion of insecticide aerosols was studied at a residential test site under a variety of nocturnal conditions. Five programmed sequential aerosol samplers were used to capture fluorescent particle traced aerosol droplets. Measurements were conducted at ground and elevated locations. Simultaneous and coincident biological measurements were performed with live caged mosquitos in order to assess standard rate ULV (ultra-low volume) applications of malathion insecticide. Meteorological measurements included vertical temperature and wind ... |
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