Small Hydro Turbine/Generator Projects at TVA
High-Performance Aerating Weirs for Dissolved Oxygen Improvement
Analysis of Reaeration Equations Using Mean Multiplicative Error
The Performance of Unconfined Hollow Fiber Membranes as Pipe Flow and Mixed Flow Aerators
Unconfined gas permeable membranes situated within mixed reactors are currently being evaluated as a viable technology for gas transfer. The use of sealed hollow fiber membranes that are...
Modeling Full-Scale Diffused Aeration Systems
The purpose of this research was to show the direct relationship of the oxygen mass transfer coefficient (KLaT)...
Testing Turbine Aeration for Dissolved Oxygen Enhancement
During August of 1993 the Bureau of Reclamation tested turbine aeration for dissolved oxygen (DO) enhancement at Deer Creek Powerplant near Provo, Utah. This test required a variety of...
Macro-Roughness Effects on Stream Reaeration
The gas transfer coefficient is key to modeling dissolved oxygen levels in streams. Engineers commonly predict it as a function of mean flow depth, velocity, and slope. Large errors are...
Design and Testing of Two Ice-Preserving Winter Lake Aeration Systems
As part of an effort to achieve ice-preserving lake aeration for winterkill prevention, two non-mixing lake aeration systems were designed and field tested. Each creates a fish refuge...
Chicago's Waterfalls
The 1994 Outstanding Civil Engineering Achievement Award goes to successful implementation of an elegantly simple idea: aerate sluggish water by letting it fall through man-made waterfalls....
MSA for VOC Removal
In what may be the first large-scale application of its type, mechanical surface aeration�usually used in wastewater treatment�is removing volatile organic compounds from potable ground...
Implementing a Watershed Plan for Lake Stevens
The water quality of Lake Stevens is declining because of watershed nonpoint pollution and cycling of nutrients from lake sediments. Hypolimnetic aeration and an alum treatment are proposed...
Mechanism of Air Entrainment in Spillway Aerators
The mechanism of air entrainment in the Nappe over spillway aerators was investigated. Turbulence was identified as the main agent for aeration. It was found that Nappe underpressure influences...
Performance of Prototype Aerating Weirs Downstream From TVA Hydropower Dams
TVA has constructed aerating weirs below certain of its hydropower dams to (1) increase tailwater dissolved oxygen (DO) content during generation, and (2) improve minimum flows between...
Chatuge Hydroproject Aerating Infuser Physical Model Study
The Tennessee Valley Authority is investigating the feasibility of a dual purpose reregulation and aeration weir to increase the dissolved oxygen in water releases and to provide continuous...
A New In-Stream Aerator
Experiments on microporous, polymeric, hollow fiber membranes are being conducted for application to in-stream aeration. The hollow fibers are scaled on one end and connected to an oxygen...
Case Study - 401 Permit and Discharge Aeration
Limnological Considerations For Aeration at Mainstem Projects
Hydro Turbine Aeration
A Process for Selecting Options to Improve Water Quality Below TVA Hydro Projects
Use of Weirs for Tailwater Improvements Downstream from TVA Hydropower Dams
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