An Evaluation of Area Source Dispersion Algorithms
The correct simulation of air pollutant dispersion from area sources of pollutants has presented some unique challenges to dispersion modelers. This study employs geometric tests and sensitivity...
Integrated Waste Management at the Weldon Spring, Missouri Site Remedial Action Project
The diversity of contaminants and contaminated media at the Weldon Spring, Missouri CERCLA site, located about 30 miles west of St. Louis, Missouri, necessitates the formulation of integrated...
Land Disposal Restrictions and Mixed Waste Management
The Land Disposal Restrictions, imposed by Congress in 1984 and implemented by the Environmental Protection Agency, impose constraints on the management of mixed waste. Except in very...
Mixed Waste Disposal at the Texas Low-Level Waste Disposal Facility
The conflicting requirements of the EPA and NRC for mixed waste disposal are reviewed. The conceptual design issued by these organizations is described in terms of its essential features....
Inside the Manhole: New Design on a Leaky Link
Wastewater collection systems represent a major investment for every community, not only in capital dollars, but also in the well-being of community members. Though sanitary sewer manholes...
Planning Subsurface Storage-Transport Facilities for Combined Sewer Overflow Control in Cincinnati, Ohio
The wastewater collection system in the greater Cincinnati area includes a large area served by a combined sewer system. The combined sewer system drains to the Ohio River and several...
Interruption of Sewer Crown Corrosion?Ecological Solutions
Competitive inhibition of acid production by thiobacilli was investigated by encouraging the growth of potential competitors. Two-organism competition experiments (Thiobacillus sp. vs....
Hydraulic Analysis of the Impacts of I/I on System Capacity
The USEPA Stormwater Management Model was used to evaluate the impact of infiltration and inflow on the separate sewer facilities of one of the largest sewage treatment districts in the...
Navy Targets Effective Infiltration/Inflow Elimination
The Naval Facilities Engineering Command (NAVFAC), Chesapeake Division, retained the services of RJN Environmental Associates, Inc. to perform a Sanitary Sewer Evaluation Survey (SSES)....
Along the Road to K
Allegations of threats from toxic and hazardous wastes advanced on political and emotional planes threaten, themselves, to overshadow the facts that should dominate ultimate technical...
Combined Nitrogen and Phosphorus Removal in a Cyclic Activated Sludge System Without Anoxic Mixing Sequences
A simplified methodology for combined phosphorus and nitrogen removal through reactor configuration, cyclic sequencing and the control of aeration intensity in variable volume activated...
Environmentally Sustainable Development: A Concept in Action
Environmentally sustainable development denotes a balanced approach with appropriate consideration for environmental protection. The successes achieved in the development of five diverse...
Propositions for Packed Bed Adsorption Reactor Design
This paper states ten propositions which describe the behavior of 'wave fronts', i.e., adsorbate concentration versus distance profiles at given elapsed times,...
Toxicity Bioassay Using Nitrifying Bacteria
Monitoring water quality by the use of toxicity bioassay was studied with respect to the interrelationship between nitrifying activities, ammonium and inorganic compounds. Differential...
Evaluation of Waste Fly Ash Pretreatment Process
A batch acid-leaching pretreatment process was investigated for its potential to reduce toxicity and leachability of a municipal waste combustor fly ash prior to land disposal. Elemental...
Toxicity Bio-Assays, 5-Day BOD and
This article revisits some of the basic definitions of toxicity bioassays and 5-day BOD and questions the the precision of these measuements and the long duration of these tests....
Screening Level Modeling in Support of an Estuarine Toxics Management Program
Mathematical models will be used in the future to determine maximum allowable pollutant loading rates for several toxics to the South San Francisco Bay Estuary. This project consisted...
Evaluation of
This paper examines the potential application of in-situ bio-dentrification as well as pertinent physical and biochemical factors that control the process to reduce nitrate in groundwater...
Remedial Planning for the Former EXPO 86 Site
This paper describes the site characterization and remedial action planning effort that is being undertaken at the former EXPO 86 site in downtown Vancouver, B.C. The 200 acre site on...
An Engineered Reactor Approach to Integrating Physicochemical and Biological Processes for In-Situ Bioremediation of Contaminated Subsurface Systems
The concept of integrating biologically active granular carbon reactors into groundwater recycle schemes to provide continuous acclimation and enrichment of microorganisms and inoculation...
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