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2004 Progress Report: Simulations of the Emission, Transport, Chemistry and Deposition of Atmospheric Mercury in the Upper Gulf Coast Region
EPA Grant Number: R831276C012Subproject: this is subproject number 012 , established and managed by the Center Director under grant CR831276
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
Center: Gulf Coast HSRC (Lamar)
Center Director: Ho, Tho C.
Title: Simulations of the Emission, Transport, Chemistry and Deposition of Atmospheric Mercury in the Upper Gulf Coast Region
Investigators: Lin, Jerry , Chu, Hsing-wei , Ho, Tho C.
Institution: Lamar University
EPA Project Officer: Krishnan, Bala S.
Project Period: December 1, 2003 through November 30, 2004
Project Period Covered by this Report: December 1, 2003 through November 30, 2004
Project Amount: Refer to main center abstract for funding details.
RFA: Gulf Coast Hazardous Substance Research Center (Lamar University) (1996)
Research Category: Hazardous Waste/Remediation , Targeted Research
Description:
Objective:Mercury is a persistent air pollutant (0.5-2 years of atmospheric lifetime) that poses a thread to human health through surface water contamination and subsequent bioaccumulation. The health effects caused by ambient exposure and ingestion of mercury compounds through food chain have been documented in the Mercury Report to Congress. Although there is a plausible link between mercury deposition flux and anthropogenic emissions, the question on whether or not anthropogenic ambient emission can be proportional to the mercury input to the biosphere and its consequences to human exposure remain uncertain. Furthermore, numerous studies have suggested that biogenic mercury emission can dominate those from anthropogenic sources, especially in summer season. This raises the question if the biogenic mercury emission also can pose a human health risk. Because the integration of multiple elements of the mercury pollution problems is complicated and usually generates nonlinear responses, a comprehensive, integrated modeling approach must be undertaken to properly address the questions that affect nearly 300 million people in the United States.
The objective of this research project is to investigate the behavior and assess the contamination pathways of atmospheric mercury using the Community Multiscale Air Quality (CMAQ) modeling system. A suite of coupled physicochemical process models will be employed to evaluate the emission, transport, reactions, and deposition of mercury. The specific objectives of the research project are to: (1) establish multiscale modeling platforms for atmospheric mercury in the Upper Gulf Coast Region; (2) compile the mercury emission inventory using the National Emission Inventory data (NEI99 for hazardous air pollutants), Toxics Release Inventory (TRI 2000), and other point/area source emission factors; (3) develop mercury chemistry modules in both gaseous phase and atmospheric droplets; (4) implement the mercury chemistry modules in CMAQ modeling; (5) simulate dynamically the emission, transport, chemistry, and deposition of atmospheric mercury in the model domains, including the impact of mercury emission control on the mercury budget in the ambient air of the region; and (6) investigate the behavior and assess the contamination pathways of atmospheric mercury using the comprehensive modeling approach in CMAQ.
Progress Summary:Establishment of High Performance Computation Modeling Platform
A high-performance computational (HPC) platform has been configured for integrated air quality simulations. The platform consists of a 5-node (one master and four slave nodes), 10-CPU (Intel Xeon® grade processor) Linux cluster with RAID-5 network attached storage optimized for parallel computing and massive data storage. The HPC platform will be used for the emission inventory, meteorology, and CMAQ simulations proposed in the study.
Assembling of Model Components
The required modeling components for the simulations of dynamic meteorology, processing of emission inventory, and comprehensive modeling of atmospheric mercury have been assembled successfully. The assembled model components are integrated as the schematic diagram shown in Figure 1 and detailed as follows:
Figure 1. The Integrated Modeling Components Implemented for the Proposed Study
Meteorological Model
The National Center for Atmospheric Research (NCAR)/Pennsylvania State University Mesoscale Scale Model, Version 5, Release 3.6 (MM5V3.6) has been installed, compiled, and tested. The modeling system consists of a number of data preparation processors, postprocessing modules, and the core MM5 model. The installed components include TERRAIN for setting up modeling domains, REGRID for processing large-scale meteorological analysis for initial and boundary conditions, LITTLE_R for preparing observational analysis for data nudging, INTERP_F for converting the data pressure level into sigma level coordinate for MM5 calculation, INTERP_B for converting the data sigma level back to pressure level coordinate during one-way nesting calculation, MM5 for dynamic meteorology simulation, and GRAPH for converting the model output into NCAR graphics-ready format for visualization.
Emission Inventory Model
The most up-to-date Sparse Matrix Operator Kernel Emissions (SMOKE) Modeling System, Version 2.0, has been installed (17 processors) and compiled for the emission inventory modeling tasks proposed in the study. In SMOKE V2.0, the processing of air toxins is included for the spatial and temporal allocations of mercury emission inventory. This version of SMOKE also has improved data flow for easy implementation of new chemical species.
Chemical Transport Model
The most updated version of the CMAQ one-atmosphere model (Version 4.3) has been installed and compiled. The installed components include JPROC for photolysis rate calculation, ICON for initial condition preparation, BCON for boundary condition preparation, MCIP2 for converting MM5 output data into model-ready meteorology, and CCTM for chemical transport simulations in parallel computation mode. The mercury modules are not included in the original model and will be developed in this study.
Collection of Mercury Emission Inventory from Anthropogenic Sources
The required mercury emission inventory from anthropogenic sources has been collected and speciated for 121 source categories from U.S. Environmental Protection Agency (EPA) data archives (NEI99 and TRI) and open literature. The data will be used in the upcoming emission inventory modeling. Table 1 shows a summary of the anthropogenic mercury emission inventory in the continental United States (following the estimates of Seigneur, et al., 2001).
Table 1. Summary of Anthropogenic Mercury Emission in the Continental United States
| Source Categories |
Utility Boilers |
Waste |
Misc. Coal Burning |
Mining |
Chlralkali Facility |
Other Sources |
Total |
Emission (tons/year) |
47.9 |
28.8 |
12.8 |
6.4 |
6.1 |
30.7 |
132.7 |
Completion of Initial Meteorological Simulation
New meteorological simulations have been completed for a 36-km continental United States domain nested into 12-km Upper Gulf Coast domain using MM5V3.6. In the simulation, two-way nesting was used and the modeling period of the TexAQS 2000 study was selected for testing purpose. The meteorological output has been processed using Meteorology-Chemistry Interface Processor (MCIP) Version 2.2 for the emission inventory modeling described in the subsequent sections. Further tuning of the meteorological simulation will be conducted in Year 2 of the project.
Development of a Biogenic Mercury Emission Processor in BEIS3 Framework
For the modeling of atmospheric mercury, the biogenic emission of mercury often has been overlooked. Recent studies, however, have suggested that biogenic mercury may dominate that of anthropogenic sources, especially in the summer season. To include this potentially important emission source in our model simulation, we have developed a prototype emission processor for biogenic mercury emission within the framework of Biogenic Emission Inventory System Version 3.11 (BEIS3). In this development, we incorporated the 230 categories of U.S. Geological Survey (USGS) landuse/landcover/vegetation data to generate the normalized vegetation-specific mercury emission in the 36-km Lambert Conformal grid covering the continental United States. The surface temperature and cloud-cover corrected solar radiation from MM5 meteorology were retrieved and used for temperature and photosynthetic active radiation (PAR) corrections to calculate the diurnal variation of biogenic mercury emission. The implemented mercury emission factors were either evaluated from the mercury flux measurement data published in the literatures for selected tree species and wetland, or assumed for the tree species without mercury flux data. The output from the model is temporally (hourly) and spatially resolved gridded emission in netCDF format ready for applications in Eulerian-based chemical transport models including CMAQ-Hg. Figure 2 shows the data flow of the developed processor.
Figure 2. Data Flow for the Developed Biogenic Mercury Emission Processor
Generation of Model-Ready Emission Inventory of Mercury
The complete mercury emission inventory for the entire continental United States has been collected, compiled, and gridded using the most updated SMOKE Version 2.1. In the emissions inventory processing, both anthropogenic and vegetative sources of mercury emission were considered. The anthropogenic emissions including point and area source emissions were based on EPA NEI99 Air Toxin Emission Inventory and TRI 2000 for mercury. A total of 121 source categories were processed and the detailed emission speciation was assigned for each source category. The spatial and temporal allocations were calculated from Multimedia Integrated Modeling System spatial surrogates and EPA standard profile. For vegetative mercury emission estimates, codes were developed within the framework of BEIS3 to process this natural emission inventory. The 230 categories USGS landuse and landcover database (BELD3) were employed to generate the standard mercury emission based on the emission factor calculated from ambient mercury flux measurement (Lin, et al., 2005). The surface temperature and radiation were extracted from MM5 meteorological fields for emission correction. Figure 3 shows the month-by-month comparison of anthropogenic and vegetative mercury emissions for elemental mercury (Hg0), divalent gaseous mercury (HgIIGAS), and particulate mercury (PHg). It can be seen that the vegetative mercury emission can rival the anthropogenic emission in summer months. The gridded, merged anthropogenic mercury emission is shown in Figure 4.
Implementation of Mercury Dry Deposition Modules in CMAQ Modeling Framework
We have developed a new deposition velocity scheme for both gaseous elemental mercury (GEM) and reactive gaseous mercury (RGM) based on Wesley’s formulation of dry deposition with pertinent physical properties of GEM and RGM including Henry’s constants, surface reactivity, and gaseous phase diffusivity. The dry deposition velocity was calculated through a resistance model considering the aerodynamic, quasilaminar layer, and canopy resistances. The estimated deposition velocity for GEM is less than 0.1 cm/second. The deposition velocity of RGM exhibits a strong diurnal variation, with a deposition velocity as high as 3.5 cm/second during midday. The time-dependent deposition velocity was used for calculating the dry mercury deposition flux in CMAQ simulation.
Figure 3. Comparison of Mercury Emission Quantity and Speciation From Anthropogenic and Vegetative Sources in the Continential United States Domain
Figure 4. The Merged Anthropogenic Mercury Emission Inventory for CMAQ-Hg Model Input
Science Updates of the Mercury Chemistry Model
New science components have been added to the mercury model of CMAQ modeling system to simulate the emission, transport, transformation and deposition of mercury in three different forms: GEM, RGM, and PHg. The new science components include: (1) product speciation and distribution of gaseous phase oxidation of GEM, (2) modification of aqueous phase sorption of dissolved Hg(II) to the insoluble particulate in atmospheric droplets, (3) modification of gaseous reaction rate constants according to new kinetic data, and (4) inclusion of additional gaseous oxidation by reactive halogens. The updated chemical reactions of mercury are listed in Table 2.
Table 2. The Chemical Mechanism Implemented in the CMAQ-Hg Model
| Reaction | Rate constant |
Hg0(g) + O3(g) |
3-75×10-20 cm3molec-1s-1 |
Hg0(aq) + O3(aq) + 2 H + |
4.7×107 M-1 s-1 |
Hg0(g) + ·OH(g) |
8.7×10-14 cm3molec-1s-1 |
Hg0(aq) + ·OH(aq) |
2.0×109 M-1 s-1 |
Hg0(aq) + HOCl(aq) |
2.09×106 M-1s-1 |
Hg0(aq) + OCl-(aq) + H+ |
1.99×106 M-1s-1 |
Hg0(g) + H2O2(g) |
8.5´10-19 cm3molec-1s-1 |
Hg0(g) + Cl2(g) |
2.6-4.8´10-18cm3molec-1s-1 |
Hg0(g) + Br2(g) |
9´10-17 cm3molec-1s-1 |
Hg0(g) + Cl(g) |
1.0´10-11 cm3molec-1s-1 |
Hg0(g) + Br(g) |
3.2´10-12 cm3molec-1s-1 |
Hg0(g) + BrO(g) |
1.5´10-14 cm3molec-1s-1 |
HgSO3(aq) |
T exp(31.971-(12595/T))s-1 |
Hg(OH)2(aq) + UV |
3×10-7 s-1, midday 60°N |
Hg(II)(aq) + HO2·(aq) |
1.7×104 M-1s-1 |
Hg0(s, g) + O2(g)Implementation of the Updated Mercury Chemistry Model in Parallel CMAQ Framework
CMAQ Version 4.4 is the latest parallel version of CMAQ released in October 2004. We have implemented the mercury chemistry codes that we modified into this release of CMAQ. The major benefits of this implementation are: (1) adding the capability of performing mercury chemical transport simulation in parallel mode, which greatly reduce the computational time, and (2) utilizing the most up-to-date chemical processors in CMAQ to calculate the concentrations of mercury oxidants and reductants.
Completion of Base-Case Simulation for Mercury Deposition in July 2001
To test the modified mercury model, monthly simulations are performed using the gridded emission inventory (for mercury and criterion pollutants) and EPA July 2001 meteorology over a 36-km domain covering the continental United States. The simulated mercury concentration and deposition flux are shown in Figures 5 and 6. It can be seen from Figure 5 that mercury emission does not greatly change GEM level, and high RGM coincides with many ozone-nonattainment areas. This indicates that atmospheric photochemical activity can enhance secondary RGM formation and thus dry mercury deposition. Greater wet mercury deposition flux is observed in the south of the domain (Figure 6).
Figure 5. Modeled Average Concentrations of Gaseous Elemental Mercury (Left) and Reactive Gaseous Mercury (Right)
Figure 6. Modeled Monthly Wet Deposition of Divalent Mercury (Left) and Particulate Mercury (Right)
Collection of Field Data of Mercury Deposition for Model Verification
For future model verification purposes, we have collected the measured wet deposition data of mercury recorded from Mercury Deposition Network (MDN) by the National Atmospheric Deposition Program. MDN collects weekly concentrations of total mercury in precipitation and uses the concentration and precipitation data to estimate the seasonal and annual wet deposition flux of total mercury at 88 sites throughout the continental United States. We have performed spatial interpolation of the concentration and deposition flux data to visualize the distribution of mercury wet deposition (Figures 7 and 8) in July 2001. As seen, the highest mercury deposition occurred in Florida and in the eastern Gulf Coast Region because of the great precipitation intensity. This agrees reasonably with our model testing runs (e.g., Figure 6). Further model verification will be performed when data become available in the midwest and west regions of the United States.
Figure 7. The Concentration of Total Mercury in Precipitation Water Over the United States in July 2001
Figure 8. The Wet Deposition Flux of Mercury Over the United States in July 2001
The proposed project tasks have been successfully completed according to the original project milestones, with the mercury model tested and all required model inputs (e.g., gridded emission inventory for mercury and other criterion pollutants) generated. These will be incorporated into the modeling works in Year 3. Future project activities will focus on investigating: (1) the effect on simulated mercury deposition from the implemented vegetative mercury emission and new mercury science components, (2) the impact of mercury emission reduction from anthropogenic sources on the dry and wet deposition of mercury, and (3) the effect of long-range and boundary transport on mercury deposition in the Continental United States. The results of the above tasks will be integrated to address the fate and contamination pathways of atmospheric mercury in the upper Gulf Coast Region.
Journal Articles on this Report: 3 Displayed | Download in RIS Format
| Other subproject views: | All 7 publications | 3 publications in selected types | All 3 journal articles |
| Other center views: | All 472 publications | 140 publications in selected types | All 123 journal articles |
| Type | Citation | ||
|---|---|---|---|
|
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Lin C-J, Lindberg SE, Ho TC, Jang C. Development of a processor in BEIS3 for vegetative mercury emission processing in the continental United States. Atmospheric Environment 2005;39(39):7529-7540. |
R831276C012 (2004) |
not available |
|
|
Lin C-J, Pongprueksa P, Lindberg SE, Pehkonen SO, Byun D, Jang C. Scientific uncertainties in atmospheric mercury models I: model science evaluation. Atmospheric Environment 2006;40(16):2911-2928. |
R831276C012 (2004) |
not available |
|
|
Lin C-J, Ho TC, Chu H-W, Yang H, Mojica MJ, Krishnarajanagar N, Chiou P, Hopper JR. A comparative study of US EPA 1996 and 1999 emission inventory in the west Gulf of Mexico coast region, USA. Journal of Environmental Management 2005;75(4):303-313. |
R831276C012 (2004) |
not available |
atmospheric mercury, emission inventory, chemical mechanism, cloud chemistry, modeling, CAMQ, waste, ecological risk assessment, environmental engineering, hazardous waste, advanced treatment technologies, bioremediation, contaminated waste sites, groundwater contamination, petroleum contaminants, hydrocarbon,
,
Ecosystem Protection/Environmental Exposure & Risk, INTERNATIONAL COOPERATION, Air, Geographic Area, Scientific Discipline, Waste, RFA, Air Quality, Gulf of Mexico, air toxics, Hazardous Waste, Environmental Engineering, Fate & Transport, Environmental Chemistry, Hazardous, Monitoring/Modeling, Environmental Monitoring, atmospheric mercury chemistry, air pollution control technology, aerosol analyzers, fate and transport, fate and transport , particulate matter mass, monitoring inorganic chemicals, emission control strategies, HAPS, hazardous air pollutants, atmospheric dispersion models, atmospheric mercury, atmospheric deposition, emissions, mercury vapor, emission control, atmospheric chemistry, emissions inventory, mercury, emissions monitoring, hazardous waste treatment, modeling
Relevant Websites:
Progress and Final Reports:
Original Abstract
Main Center Abstract and Reports:
CR831276 Gulf Coast HSRC (Lamar)
Subprojects under this Center:
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
R822721C529 Environmentally Acceptable Endpoints: Risk Based Remediation Using Bioremediation
R822721C552 Degradative Solidification/Stabilization Technology for Chlorinated Hydrocarbons
R822721C569 Treatment and Product Recovery: Supercritical Water Oxidation of Nylon Monomer Manufacturing Waste
R822721C620 Colloidal Fouling of Membranes: Implications in the Treatment of Textile Dye Wastes and Water Reuse
R822721C626 Catalytic Hydroprocessing of Chlorinated Organics
R822721C627 The Interaction of Microbial Activity and Zero Valent Iron Permeable Barrier Technology
R822721C630 Microbial Cometabolism of Recalcitrant Chemicals in Contaminated Air Streams
R822721C633 Catalyst Lifetime Studies for Chlorocarbon Steam Reforming
R822721C635 Electrokinetic/Surfactant-Enhanced Remediation of Hydrophobic Pollutants in Low Permeability Subsurface Environments
R822721C636 Transformation Reactions of Nitroaromatic and Nitrogen Heterocyclic Compounds on Granular Activated Carbon (GAC) Surfaces: Enhancement of GAC Adsorption in Natural and Engineered Environmental Systems
R822721C640 Environmentally Friendly Organic Synthesis in Supercritical Fluids
R822721C645 Development and Evaluation of an Integrated Model to Facilitate Risk-Based Corrective Action at Superfund Sites
R822721C651 Adjustable Biopolymer Chelators for Cadmium, Lead and Mercury
R822721C653 New Electrochemically Smart Catalysts for Hazardous Waste Management and Development of Capillary Electrophoresis for Analysis of their Products
R822721C655 Soil Sampling in South Alabama Oil Fields
R822721C659 Subsurface Contamination Site Characterization via a Computer-Aided Visual Tool
R822721C661 New Insoluble supports for Protein Immobilization for Use in Metalloprotein Affinity Metal Chromatography
R822721C663 Soil Remediation with Ultra-High-Efficiency Hydrocyclones
R822721C669 Solid Acid Catalyzed Alkylation in Supercritical Fluids
R822721C679 Regeneration/Reactivation of Carbon Adsorbents by Radio Frequency (RF) Induction Heating
R822721C687 Improved Halogen Resistance of Catalytic Oxidation
R822721C696 Phytoremediation and Bioremediation of Land Contaminated By PAHs, PCBs, and TNT
R822721C697 Fundamental and Kinetic Investigation of Sorbent Technology for Optimum Mercury Emission Control
R822721C700 Effects of Natural and Cyclic Variations on Contaminant Fate and Transport
R822721C703 Enhancement of DNAPL Dissolution Rates by Dechlorinating Anaerobes
R826694C620 Colloidal Fouling of Membranes: Implications in the Treatment of Textile Dye Wastes and Water Reuse
R826694C625 Enhanced Treatment of DNAPLs Contaminated Soils and Groundwater Using Biosurfactants: In-Situ Bioremediation
R826694C626 Catalytic Hydroprocessing of Chlorinated Wastes
R826694C627 The Interaction of Microbial Activity and Zero Valent Iron Permeable Barrier Technology
R826694C629 Biofiltration of BTEX in Petroleum-Contaminated Soil Remediation Off-Gas
R826694C630 Microbial Cometabolism of Recalcitrant Chemicals in Contaminated Air Streams
R826694C633 Catalyst Lifetime Studies for Chlorocarbon Steam Reforming
R826694C635 Electrokinetic/Surfactant-Enhanced Remediation of Hydrophobic Pollutants in Low Permeability Subsurface Environments
R826694C636 Transformation Reactions of Nitroaromatic and Nitrogen Heterocyclic Compounds on Granular Activated Carbon (GAC) Surfaces: Enhancement of GAC Adsorption in Natural and Engineered Environmental Systems
R826694C640 Environmentally Friendly Organic Synthesis in Supercritical Fluids
R826694C645 Development and Evaluation of an Integrated Model to Facilitate Risk-Based Corrective Action at Superfund Sites
R826694C651 Adjustable Biopolymer Chelators for Cadmium, Lead, and Mercury Remeidation
R826694C659 Subsurface Contamination Site characterization Via a Computer-Aided Visual Tool
R826694C661 New Insoluble supports for Protein Immobilization for Use in Metalloprotein Affinity Metal Chromatography
R826694C669 Solid Acid Catalyzed Alkylation in Supercritical Reaction Media
R826694C679 Regeneration and Reactivation of Carbon Adsorbents by Radio Frequency Induction Heating
R826694C696 Phytoremediation and Bioremediation of Land Contaminated By PAHs, PCBs, and TNT
R826694C697 Fundamental and Kinetic Investigation of Sorbent Technology for Optimum Mercury Emission Control
R826694C700 Effects of Natural Cyclic Variations on Contaminated Fate and Transport
R826694C703 Enhancement of DNAPL Dissolution Rates by Dechlorinating Anaerobes
R826694C705 A Pilot Plant for Producing Mixed Ketones from Waste Biomass
R826694C722 The Effects of an Oily-Phase on VOC Emissions from Industrial Wastewater
R826694C724 Mercury Removal from Stack Gas by Aqueous Scrubbing
R826694C725 Transport, Fate and Risk Implications of Environmentally Acceptable Endpoint Decisions
R826694C731 Development and Application of a Real-Time Optical Sensor for Atmospheric Formaldehyde
R826694C734 An Advanced System for Pollution Prevention in Chemical Complexes
R828598C001 Field Study Abstract: A Model of Ambient Air Pollution in Southeast Texas Using Artificial Neural Network Technology
R828598C002 Hollow Fiber Membrane Bioreactors for Treating Water and Air Streams Contaminated with Chlorinated Solvents
R828598C003 Fugitive Emissions of Hazardous Air Pollutants from On-Site Industrial Sewers
R828598C004 Biofiltration Technology Development
R828598C005 A Risk-Based Decision Analysis Approach for Aquifers Contaminated with DNAPLs
R828598C006 In-Situ Remediation for Contaminated Soils Using Prefabricated Vertical Drains
R828598C007 Membrane Technology Selection System for the Metal Finishing Industry
R828598C008 Sequential Environments for Enhanced Bioremediation of Chlorinated Aliphatic Hydrocarbons
R828598C009 Waste Minimization in the Magnetic Tape Industry: Waterborne Coating Formulations for Magnetic Tape Manufacture
R828598C010 Soil Remediation by Agglomeration with Petroleum Coke
R828598C011 Recovery of Dilute Phosphoric Acid in Waste Streams Using Waste Gas Ammonia: The Regenerative MAP/DAP Process
R828598C012 Stochastic Risk Assessment for Bioremediation
R828598C013 Selective Removal of Heavy Metals from Wastewater by Chelation in Supercritical Fluids
R828598C014 Optimization of Treatment Technologies for Detoxification of PCB Contaminated Soils
R828598C015 Wastewater Remediation by Catalytic Wet Oxidation
R828598C016 Permanence of Metals Containment in Solidified and Stabilized Wastes
R828598C017 Combustion Enhancement by Radial Jet Reattachment - Low Generation of Hazardous Gases and High Thermal Efficiency
R828598C018 A Process To Convert Industrial Biosludge and Paper Fines to Mixed Alcohol Fuels
R828598C019 Homogeneous Catalysis in Supercritical Carbon Dioxide
R828598C020 Ultrasonic Enhancement of the Removal of Heavy Metals
R828598C021 The Binding Chemistry and Leaching Mechanisms of Advanced Solidification/Stabilization Systems for Hazardous Waste Management
R828598C022 Development of an Air-Stripping and UV/H2O2 Oxidation Integrated Process To Treat a Chloro-Hydrocarbon-Contaminated Ground Water
R828598C023 A Comparative Study of Siting Opposition in Two Counties
R828598C024 Sonochemical Treatment of Hazardous Organic Compounds II: Process Optimization and Pathway Studies
R828598C025 Laser Diagnostics of the Combustion Process within a Rotary Kiln Incinerator
R828598C026 Use of Inorganic Ion Exchangers for Hazardous Waste Remediation
R828598C027 Kaolinite Sorbent for the Removal of Heavy Metals from Incinerated Lubricating Oils
R828598C028 Destruction of Chlorinated Hydrocarbons in Process Streams Using Catalytic Steam Reforming
R828598C029 Integrated Process Treatment Train (Bioremediation {Aerobic/Anaerobic} and Immobilization) for Texas Soils Contaminated with Combined Hazardous Wastes
R828598C030 Photo-Oxidation by H2O2/VisUV of Off-Gas Atmospheric Emissions from Industrial and Environmental Remediation Sources
R828598C031 Concentrated Halide Extraction and Recovery of Lead from Soil
R828598C032 Biodegradable Surfactant for Underground Chlorinated Solvent Remediation
R828598C033 A Software Guidance System for Choosing Analytical Subsurface Fate and Transport Models Including a Library of Computer Solutions for the Analytical Models
R828598C034 Hydrodynamic Modeling of Leachate Recirculating Landfill
R828598C035 Measurement of Oxygen Transfer Rate in Soil Matrices
R828598C036 Sorbent Technology for Multipollutant Control During Fluidized Bed Incineration
R828598C037 Pollution Prevention by Process Modification Using On-Line Optimization
R828598C038 Pollution Prevention by Process Modification
R828598C039 Water Solubility and Henry's Law Constant
R828598C040 Transferring Technical Information on Hazardous Substance Research by Publishing on the World Wide Web
R828598C041 Stress Protein Responses to Multiple Metal Exposure in Grass Shrimp
R828598C042 Life-Cycle Environmental Costing for Managing Pollution Prevention in the Chemical and Petroleum Refining Industries: A Cross-Border Approach
R828598C687 Improved Halogen Resistance of Catalytic Oxidation Through Efficient Catalyst Testing
R828598C696 Phytoremediation and Bioremediation of Land Contaminated By PAHs, PCBs, and TNT
R828598C697 Fundamental and Kinetic Investigation of Sorbent Technology for Optimum Mercury Emission Control
R828598C700 Effects of Natural Cyclic Variations on Contaminated Fate and Transport
R828598C703 Enhancement of DNAPL Dissolution Rates by Dechlorinating Anaerobes
R828598C705 A Pilot Plant for Producing Mixed Ketones from Waste Biomass
R828598C722 The Effects of an Oily-Phase on VOC Emissions from Industrial Wastewater
R828598C724 Mercury Removal from Stack Gas by Aqueous Scrubbing
R828598C725 Transport, Fate and Risk Implications of Environmentally Acceptable Endpoint Decisions
R828598C731 Development and Application of a Real Time Optical Sensor for Atmospheric Formaldehyde
R828598C734 An Advanced System for Pollution Prevention in Chemical Complexes
R828598C743 Field Demonstration of Ultrasound Enhancement of Permeable Treatment Walls
R828598C744 Optical Fibers Coated With Titania Membrane/UV-Generating Crystal in a Distributed-Light Photoreactor for VOC Oxidation
R828598C749 Characterization and Modeling of Indoor Particulate Contaminants In a Heavily Industrialized Community
R828598C753 Adsolubilization and Photocatalysis in a Semiconducting Monolithic Reactor for Wastewater Treatment
R828598C754 Remote Detection of Gas Emissions in Industrial Processes
R828598C759 Searching for Optimum Composition of Phosphogypsum: Fly ash: Cement Composites for Oyster Culch Materials
R828598C761 Development of a Phytologically-Based Biosorptive Water Treatment Process
R828598C766 Chlorinated Solvent Impact and Remediation Strategies for the Dry Cleaning Industry
R828598C769 Soil/Sediment Remediation by Hot Water Extraction Combined with In-Situ Wet Oxidation
R828598C771 Fluoracrylate Polymer Supported Ligands as Catalysts for Environmentally Benign Synthesis in Supercritical Fluids
R828598C774 The Feasibility of Electrophoretic Repair of Impoundment Leaks
R828598C777 Surfactant Enhanced Photo-oxidation of Wastewaters
R828598C778 Stationary Power Generation Via Solid Oxide Fuel Cells: A Response to Pollution and Global Warming
R828598C786 Photocatalytic Recovery of Sulfur and Hydrogen From Hydrogen Sulfide
R828598C787 Biosurfactant Produced from Used Vegetable Oil for removal of Metals From Wastewaters and Soils
R828598C789 Genetic Engineering of Enzymatic Cyanide Clearance
R828598C791 Characterizing the Intrinsic Remediation of MTBE at Field Sites
R828598C799 Simultaneous Water Conservation/Recycling/Reuse and Waste Reduction in Semiconductor Manufacturing
R828598C801 Building Defined Mixed Cultures To Biodegrade Diverse Mixtures Of Chlorinated Solvents
R828598C802 Engineering of Nanocrystal Based Catalytic Materials for Hydroprocessing of Halogenated Organics
R828598C807 Commercial Demonstration of Hydrogen Peroxide Injection to Control NOx Emissions from Combustion Sources
R828598C809 Evaluating Source Grouting and ORC for Remediating MTBE Sites
R828598C810 Application of Total Cost Assessment To Process Design In the Chemical Industry
R828598C846 Quantitative Demonstration of Source-Zone Bioremediation in A Field-Scale Experimental Controlled Release System
R831276C001 DNAPL Source Control by Reductive Dechlorination with Fe(II)
R831276C002 Arsenic Removal and Stabilization with Synthesized Pyrite
R831276C003 A Large-Scale Experimental Investigation of the Impact of Ethanol on Groundwater Contamination
R831276C004 Visible-Light-Responsive Titania Modified with Aerogel/Ferroelectric Optical Materials for VOC Oxidation
R831276C005 Development of a Microwave-Induced On-Site Regeneration Technology for Advancing the Control of Mercury and VOC Emissions Employing Activated Carbon
R831276C006 Pollution Prevention through Functionality Tracking and Property Integration
R831276C007 Compact Nephelometer System for On-Line Monitoring of Particulate Matter Emissions
R831276C008 Effect of Pitting Corrosion Promoters on the Treatment of Waters Contaminated with a Nitroaromatic Compounds Using Integrated Reductive/Oxidative Processes
R831276C009 Linear Polymer Chain and Bioengineered Chelators for Metals Remediation
R831276C010 Treatment of Perchlorate Contaminated Water Using a Combined Biotic/Abiotic Process
R831276C011 Rapid Determination of Microbial Pathways for Pollutant Degradation
R831276C012 Simulations of the Emission, Transport, Chemistry and Deposition of Atmospheric Mercury in the Upper Gulf Coast Region
R831276C013 Reduction of Environmental Impact and Improvement of Intrinsic Security in Unsteady-state
R831276C014 Integrated Chemical Complex and Cogeneration Analysis System: Greenhouse Gas Management and Pollution Prevention Solutions
R831276C015 Improved Combustion Catalysts for NOx Emission Reduction
R831276C016 A Large-Scale Experimental Investigation of the Impact of Ethanol on Groundwater Contamination
R831276C017 Minimization of Hazardous Ion-Exchange Brine Waste by Biological Treatment of Perchlorate and Nitrate to Allow Brine Recycle
R831276C018 Integrated Chemical Complex and Cogeneration Analysis System: Greenhouse Gas Management and Pollution Prevention Solutions