Simplified Methods to Predict the Fate of Metals in Rives
Heavy metal contamination of rivers is of increasing concern to society. To help predict the fate of metals in rivers, researchers have developed computer models to simulate speciation...
NCASI Enhancements of the QUAL-II Model
The mathematical water quality model QUAL-II has been modified to reflect advances in the understanding of algal, nutrient, and light interactions. Code changes were also made to incorporate...
Predicting Lake-Chain Quality with Augmentation
Steady-state mass-balance models of lake phosphorus are analyzed with regard to predicting augmentation (or dilution) effects. One form of these models employs a retention coefficient...
Industrial NPDES Toxicity Goals
Biological monitoring of NPDES (National Pollution Discharge Elimination System) effluents is becoming a reality in several EPA regions. While the advantages are genuine the loopholes...
Direct Filtration of Colored Water Supplies
The effects of raw water quality, chemical treatment, and filtration variables on the performance of direct filtration are examined. Cationic polyelectrolytes as sole coagulants are effective...
Wetland Protection Regulations: A Technical Perspective
This paper summarizes the technical basis for the application of wetland protection regulatory schemes upon a number of typical environmental engineering and related projects. A number...
Impacts of Stormwater Runoff on Receiving Waters
A planning methodology to assess the impact of stormwater runoff on streams in Vermont is demonstrated. The methodology, which is based on a statistical representation of runoff and stream...
A Study of River Foaming and its Possible Causes
Foaming has been observed on uncontaminated upland streams draining watersheds having no human related development. Because water alone will not foam when agitated, the presence of these...
Development of a Simplified Nitrogen Mass Balance Model in a Macroalgae Dominated System
A seasonably variable nitrogen uptake rate has been established for Ulva in Mumford Cove, Conn. This rate has been verified using three separate water quality analyses each of which assume...
In-Plant Testing for Evaluating Aeration Systems
In the fall of 1984, ASCE published a standard, Measurements of Oxygen Transfer in Clean Water. The standard, if used by the industry, should simplify evaluation of alternative aeration...
Relating Water Treatment Problems to O & M Factors
The author discusses the operations and maintenance factors that must be considered in dealing with water treatment problems....
Microcomputer Methods for Toxicants in Ground Waters and Rivers
This paper describes a program written for the IBM personal computers to assess the fate of toxicants in ground waters and in rivers. The algorithms in the program were selected from a...
Underground Oil Lens Management at John F. Kennedy International Airport
Observation wells plumbed using a water surface detector and standard topographic interpolation techniques were used to establish the hydraulic gradient of the groundwater and the presence...
Design and Construction of TCE/PCE Removal Facilities
This paper presents a review of the design and construction of a facility in Arcadia, California, to remove trichloroethylene (TCE) and tetrachlorethylene (PCE) from ground water. (Edited...
Hazard Assessment of Landfill Fire Air Emissions
The PJP Landfill, located in northeastern New Jersey, is a suspected hazardous waste site, and is listed on the federal Superfund National Priorities List. In addition to contaminating...
Transport of Halogenated Organics in Saturated Groundwater Flow: Theoretical and Experimental Results
This paper presents the development of a mathematical model to describe transport of organic chemicals in saturated soil columns and compares model predictions to experimental results....
Solubility of Aromat6ic Solutes and Sorption onto Soil in Polar Solvent/Water Systems
An investigation was performed to evaluate the solubility and sorption of aromatic solutes onto soil from an aqueous phase containing polar solvent. This work relates to the evaluation...
Analysis of Technologies for Small Water Systems
The problems encountered when small systems must meet the provisions of the National Primary Drinking Water Regulations are discussed. Among the potential water quality problems that could...
Impact of Metallic Solders on Water Quality
A description is given of first-draw water testing at residences in a Long Island, N. Y. , water district. Results for heavy metals, particularly lead, leaching from the solder and plumbing...
Boston MDC Experience With Chloramine Disinfection
In May, 1982, as a condition for approval of plans for improvements to the Metropolitan District Commission (MDC) chlorination facility at Norumbega Reservoir, the Massachusetts Department...
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