How is the Water Quality Affected by Droughts?
The moving average method was applied to daily time series of water quality and flow data obtained from a stream gaging station affected by the 1988 drought in the midwest of the United...
Quantity and Quality of Dry Weather Flow in Las Vegas Valley, Nevada
In recognition of the potential for dry weather flows to convey pollutants from the Las Vegas Valley, the potential economic and resource value of these flows within the Valley, and the...
Caustic Spray for Sewer Crown Corrosion Control
A novel method to control sewer crown corrosion which involves spray application of a caustic solution to the sewer crown is described. Corrosion control using this concept is based on...
Microbiologically Induced Corrosion
Researchers investigating a building whose columns bled a colorless liquid found that the building was under attack by microorganisms. A community of bacteria had contaminated the fireproofing...
An Electrochemical Approach to Predicting Corrosion Performance of Container Materials
The pitting potentials of nickel-rich Alloy 825 are measured in chloride-containing solutions at different temperatures and adjusted to different pH values. The pitting potentials were...
Estimating Geochemical Behavior of Cocnretes to be Placed at Yucca Mountain
The interactions of J-13 water with cementitious materials were examined at 25?C using the geochemical code EQ3NR/EQ6. Results of the modeling suggested the following conclusions: (1)...
Characteristics of Colloids in Landfill Leachate
Leachate was collected from a municipal landfill which has been closed for about 15 years. The sample was collected (under a N2 atmosphere) only...
Trihalomethane Precursor Removal by Ozone and Ultraviolet Radiation
The research objectives were definition of trihalomethane formation potential (THMFP) reduction in groundwater matrix using ultraviolet radiation (UV) catalyzed ozone oxidation (UV/Ozone)....
Influence of Soil and Sediment pH and Redox Conditions on Degradation of Toxic Organics
The presence of toxic organics in soil and sediments has raised concern over persistence and bioaccumulation. In the absence of oxygen, microbial degradation of toxic organics proceeds...
Removal of Scale from Potable Hot Water Systems by Carbon Dioxide Injections
An innovative method for inplace scale removal has been developed and demonstrated. Injection of carbon dioxide gas into a piping system can lower the pH of the hot water and remove or...
Loss of Carrying Capacity in Pipes?Transporting Softened Water with High pH
The increase in pipe roughness and loss in carrying capacity for water mains carrying high pH water is documented with over 20 field tests conducted in Austin, Texas. The data show that...
Pre-Formed Aluminum Hydroxide as an Alternative to Alum for Coagulation
The objective of this research was to conduct a comparison study of the coagulants, alum and pre-formed aluminum hydroxide, for turbidity and color removals in water treatment. By examining...
Fate and Transport of an Acid Waste in Soil and Groundwater
A fate and transport study at a closed acid waste pond located on the shore of San Francisco Bay indicated the potential of native soil and groundwater for retarding the movement of contaminants...
Chromium Removal by Activated Sludge
The behavior of chromium (Cr) in a laboratory-scale, activated sludge process was evaluated. Both pH and the oxidation state of Cr were confirmed as critical parameters for evaluating...
Effect of Wastewater Characteristics on the Sulfide Problem (
This paper presents an overview of various wastewater characteristics with which the designer should be familiar, and the effect of those characteristics on the sulfide problem, including...
Direct Filtration of a Semiconductor Wastewater
A pilot plant study was conducted to determine the feasibility of direct filtration for the removal of metal precipitates from a semiconductor manufacturing wastewater. The pH of the acidic...
Strip Mine Reclamation Using Dredged Material
This alternative was investigated through the creation of a field study to demonstrate the feasibility of using a cover of dewatered dredged material to reclaim surface mine deposits....
How to Remove Trihalomethanes from Drinking Water
During the past year, there's been much concern about trihalomethanes (THMs) in drinking water; for they are suspected carcinogens. These chemicals are formed in the drinking...
Industrial, Municipal Wastes Combined
The design of the facility in South Paris, Maine, is based on a modified secondary activated sludge treatment process. Because of the quality of the specific industrial wastes being treated,...
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