Identifying DepositionalAreas in Puget Sound
Depositional areas where fine sediments accumulate have been located through low-cost sediment studies instead of more costly current meter and settling trap measurements. Over 200 samples...

Modeled Effects of Hydraulic Mixing Devices on Reservoir Water Quality
A two-dimensional reservoir water quality model was used to evaluate effects of hydraulic mixing devices on release and water quality. Seasonal simulations of Douglas Reservoir water quality...

Water Quality Management Through Project Operation
Harry S. Truman Dam, a multipurpose reservoir project, is located on the Osage River in the headwaters of the Lake of the Ozarks. Construction of this project created the potential to...

Sewers Get a Breath of Fresh Air
Domestic sewage pump stations and treatment facilities have long been plagued by corrosion and odor problems caused by hydrogen sulfide. It is also extremely toxic. Sulfide production...

The Optimization of Nitrification and Denitrification in Plug-Flow Activated Sludge Systems Treating Municipal Wastestreams
Most conventional plug-flow activated sludge plants experience nitrification, particularly during higher temperature conditions. Under these circumstances, additional power is required...

Power from the Incineration of Wastewater Sludge
The City of Kansas City, Kansas recently completed an upgrading of their existing primary treatment and sludge handling system in preparation for the addition of a high purity oxygen activated...

Reduction of Nitrogen and COD by Land Disposal of Dairy Wastewater
Land disposal of industrial wastewater, and in particular the ridge and furrow (R&F) process, has been a popular and simple treatment method for many years. This study, conducted...

Air-Water Oxygen Transfer at Spillways and Hydraulic Jumps
Dissolved oxygen measurements are reported for seven spillway structures in the vicinity of Minneapolis, Minnesota, corresponding to 27 individual surveys. The surveys are taken during...

Improving Streamflow and Water Quality Below Dams
Progress by the Tennessee Valley Authority on improving dissolved oxygen (DO) and flow conditions below hydropower projects is discussed. New methods of turbine venting have resulted in...

Oxygenation of Releases from Richard B. Russell Dam
The oxygen injection system at the Richard B. Russell project has a continuous injection system located 1 mile upstream of the Russell damsite but also has supplemental injection capability...

A Unified Hydrodynamic-Water Quality Model
To understand the cause-effect relationships controlling water quality in dynamically narrow estuaries, a time dependent branching, laterally averaged (longitudinal and vertical) hydrodynamic...

Effect of Baghdad City Sewage Treatment Effluents on Dissolved Oxygen Profiles of an Iraqi River
The paper presents measured dissolved oxygen (DO) profiles in an Iraqi river in the vicinity of Baghdad City. The effect of the effluent discharges from Baghdad Sewage Treatment Plant...

Application of Lotus Symphony in Water Quality Modeling
The spreadsheet capability of the Lotus Symphony program package was used to simulate the dissolved oxygen dynamics in streams and rivers. 'Windows' were created...

Turbine Efficiency Loss Associated with Draft Tube Aeration
Draft tube aeration is one method for improving the dissolved oxygen content of hydroelectric discharges. A simple analytical procedure is presented for estimating the loss in turbine...

Oxygenation of Releases from Richard B. Russell Dam
In July 1972, the Georgia Department of Natural Resources requested the formation of a technical committee to analyze the water quality matters relating to the Russell project. Studies...

Making Treatment Plants Work
For the most part, past design criteria that have been used were based primarily on historical information from plants that worked or general rule of thumb criteria. With the increasing...

Tampa Bay 205J Water Quality Impact Study
Tampa Bay was identified by the State of Florida Department of Environmental Regulation (FDER) as to the top priority for an impact study using federal 205(j) grant funding. The study...

Evaluation of the Effects of Temperature and Oxygen Concentration on Lignin Biodegradation
Color in natural waters has been attributed to humic substances which are believed to originate as by-products of lignin biodegradation. The purpose of our research was to examine the...

Role of Air in Improving First-Stage RBC Performance
A four-stage RBC (rotating biological contactor) treatment plant having two parallel trains is used to treat combined municipal and industrial dairy waste from a city with a population...

A Modified RBC Design: Performance Evaluation
An RBC (rotating biological contactor) system was designed using Pall rings type 40, and tested under high organic surface conditions. Influent soluble BOD averaged at 55 mg/l, equivalent...

 

 

 

 

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