Non-Traditional Water Quality Approaches

Improved Performance of Activated Sludge with Addition of Inorganic Solids

Thermal Discharge Effects on Dissolved Oxygen in an Urban Estuary

Metal Hydroxide and Metal Oxide Enhanced Activated Sludge: An Industrial Strength Wastewater Treatment Process

Waterfall Aeration Works
When they sought an alternative for instream aeration in Chicago's Calumet Waterway System, engineers at the Metropolitan Water Reclamation District of Greater Chicago (MWRDGC)...

The PowerBargeTM for Lock/Dams on Inland Waterways
Following a brief description of the prefabricated floating PowerBarge concept, the range of application and expected cost and time savings is presented. Environmental benefits are described...

Isotopic Discontinuities in Ground Water Beneath Yucca Mountain, Nevada
Analytical data for stable isotopes in ground water from beneath Yucca Mountain, when examined in map view, show areal patterns of heterogeneity that can be interpreted in terms of mixing...

Automated Sensitivity Analysis for FORTRAN Models
For complex computer models used in engineering design and assessment, a cost-efficient procedure for identifying the parameters that are important to a given model prediction is a necessity....

Myocardial Wall Stress: A Clinician's View
Definition of left ventricular (LV) wall stress is a parameter which has a valid application in clinical medicine. This paper discusses this application as it pertains to various cardiac...

Moored Systems for Time Series Observations of Bio-optical and Physical Variability in the Coastal Ocean
Recently, multivariable moored systems (MVMS) have been developed to study the ecology and physics of the upper ocean. Concurrent MVMS measurements provide time series of beam attenuation...

Salt Pond Watchers, Citizen Monitoring for Better Government Decisions
Since 1985, 50 Salt Pond Watchers have monitored the effects of development on 7 estuarine bays in Rhode Island. Volunteers test the waters biweekly for temperature, dissolved oxygen (LaMotte...

Chemical Parameters Before a Red Tide Bloom, Gulf of Tehuantepec, Mexico
Gulf of Tehuantepec in the Mexican Pacific is characterized by 'north winds' (Tepehuanos) from October through March. These winds form a upwelling area in front...

Controlling Nitrogen Loading to Coastal Waters
Of the countless contaminants that reach coastal waters, nitrogen is one of the most problematic and least regulated. There is ample evidence that many coastal embayments are overwhelmed...

Evolution (1980-1990) of Ammonia and Dissolved Oxygen in Guanabara Bay, RJ, Brazil
The UFRJ is located on an island of Guanabara Bay and the Institute of Biology has been developing systematic studies on the bay. A synthesis of these studies and their different methodologies...

Coordinated Management of Coastal Waters in the New York-New Jersey-Connecticut Region
The U.S. Environmental Protection Agency Region II is currently funding three major water quality planning efforts for the coastal waters in the New York-New Jersey-Connecticut region....

The Stratigraphic Record of Oxygen Isotope Stage 5 on the Maryland Inner Shelf
Present knowledge of Holocene transgressive coastal/shelf systems, while extensive, cannot directly address the effects and consequences of an extended period of relatively high sea levels...

Toxicity Bio-Assays, 5-Day BOD and Deja Vu
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....

Environmental Impacts of Drought in the Tennessee Valley
Beginning in June 1984, the Tennessee Valley region entered the most severe, extended period of drought since record keeping began in 1890. The historical annual average rainfall across...

Hydrogen Sulfide in Hydropower Reservoirs
Hydrogen sulfide is toxic to aquatic life and corrosive to construction materials at concentrations that are considerably lower than detection limits of analytical procedures commonly...

Factors Affecting Dissolved Oxygen in Hydropower Reservoirs
Dissolved oxygen (DO) is becoming a significant issue for hydropower projects. This paper identifies some key factors that can help hydropower operators better understand the nature of...

 

 

 

 

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