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Evaluation of Chlorine Dioxide and Ozone Preoxidation on Conventional Treatment and Direct Filtration
The renewed interest in the use of chlorine dioxide and ozone as preoxidants has focused mainly on their effectiveness on color and THM precursor removal and as disinfectants. This paper...

Meeting Revised Drinking Water Regulations Using Conventional Treatment Methods
This paper discusses the removal efficiency of standard treatment processes for each of the four groups of contaminants. The evaluation of a process's capability to meet the...

Removal of Radon and Uranium from a water supply
The removal of Radon and Radium from drinking water with the help of granulated activated carbon (GAC) adsorption was investigated. A packed bed column was used for the purpose. It has...

Application of a Relative Site Ranking Methodology to Regulation of Groundwater Contamination Sites
An assessment methodology for ranking groundwater contamination sites is described. The ranking of nearly 100 actual contamination sites, and the definition and calibration of 'zones...

Remedial Measures for a Creosote Impoundment Closure
In conformance with the 1984 amendments to the Resource Conservation and Recovery Act (RCRA) Part 264 requirements, Burlington Northern Railroad (BN) constructed a double high density...

Risk Assessment Methodology for Determining Groundwater Contamination from Landfilling Sludge
Contaminant concentration criteria are required to prevent contaminant infiltration from leading to conditions which exceed health criteria. A methodology of groundwater has been described...

Modeling the Movement of Volatile Organic Chemicals with Unsaturated Flow
Over the past decade, the rate of groundwater contamination by volatile organic chemicals (VOCs) has increased. Therefore, for both groundwater protection and cleanup, it is necessary...

Modeling Dispersion in Non-Homogenous Formations
A stochastic model of contaminant mixing in non-homogeneous porous media has been developed. The model is three dimensional and relates the contaminant distribution to the probability...

Data from Most Monitoring Wells in Limestone Terranes Are Irrelevant to Pollutant Detection but Reliable Monitoring Can Be Attained: Why and How
The conventional system of using three or more monitoring wells placed down-gradient from a site and one or more background wells placed up-gradient from it is extremely unlikely to detect...

Effects of Sampling Equipmenton the Chemical Integrity of Groundwater Samples
Proper sampling of groundwater is one of the basic steps in monitoring movement of pollutants in groundwater systems. The effect of the use of silicone rubber when used as a bladder in...

Treatment Facilities and Costs for the Removal of Radon from Ground Water Supplies
Two methods for removal of Radon from drinking water are considered: activated carbon adsorption and packed tower aeration. Although both granular activated carbon (GAC) and packed tower...

Removal of EDB from Groundwater by Granular Activated Carbon Filtration
Application of ethylene dibromide (EDB) pesticide to crops may result in contamination of groundwater. Various water treatment alternatives are: granulated activated carbon adsorption,...

Subsidence by Rising and Fluctuating Ground Water
Present studies by the U. S. Bureau of Reclamation in California indicate that under certain geologic conditions similar subsidence can also be caused by rising ground-water levels, which...

Expert Pattern Recognition for Pollution Source Identification
This paper presents an approach for developing an Expert System to aid the identification of locations and magnitudes of a finite number of groundwater pollution sources. A pattern recognition...

Artificial Recharge for Managing the Great Salt Lake
During the past three years, precipitation amounts throughout the drainage basin have significantly exceeded normal values. The resulting record breaking inflow volumes and lower than...

Conjunctive Use and Managed Groundwater Recharge: Engineering and Politics in Arid Lands
In regions with alluvial groundwater basins, increasing consumer demands for water, irregular surface water flows, and high evapotranspiration rates, managed recharge and long-term conjunctive...

Modeling an Alluvial Aquifer with Flood Irrigation
Interaction between an unconfined alluvial aquifer, recharged by flood irrigation, and the associated stream system in a glacial outwash area of Wyoming was studied. The United States...

Simultaneous Pumping from Layered Ground Water
Laboratory experiments with a Hele-Shaw model and a sand model, and an approximate mathematical analysis using finite elements and the computer, have demonstrated that fresh water can...

Surface Water Analysis for Ground Water Simulation
The California Department of Water Resources (DWR) has applied a hydrologic-economic modeling (HEM) system to the analysis of ground water use in the San Joaquin Valley. An important component...

Design for Comuputer-Aided Water Resource Planning
This paper discusses an integrated approach to computerizing the major functions of regulatory agencies involved in water resource planning and water quality protection. This integrated...

 

 

 

 

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