High Hopes for Cattails
As other areas of wastewater treatment go high tech, man-made wetlands are treating wastewater from small towns and coal mines. Plants are grown in about 1 ft of water. Suspended solids...
Jet Grout Stabilization of Peaty Soils Under a Railway Embankment in Italy
The construction of two railway embankments on a peaty soil deposit up to 7m thick required a foundation improvement program meeting very strict specifications in terms of environmental...
Consolidation Grouting Operations for Kirkwood Penstock
Kirkwood Penstock, which is part of the Hetch Hetchy water system of the City of San Francisco, California exhibited evidence of settlement and local extension following extraordinarily...
Coastal Barrier Island Management in Florida
Coastal barriers in Florida have experienced the brunt of the state's rapid population growth. Excessive development of these environmentally sensitive areas has destroyed...
Dredge Disposal Monitoring by Fourier Shape Analysis
Fourier grain-shape analysis characterizes a population of sediments in terms of the shapes of the grains. The technique of grain-shape analysis has been successfully applied to the area...
Selection of Marine Bioindicators for Monitoring Radioactive Wastes Released from Nuclear Power Plants
The Brazilian Nuclear Program comprises the Angra I Nuclear Power Plant, in operational tests; the Angra II Nuclear Power Plant, under construction, expected to be completed in 1992; and...
Automated Design of Wastewater Plants
Computers have been used for individual steps in design of wastewater treatment plants, and now these steps have been tied together, linked by an aggregate computer program the designers...
Sulfide in Wastewater Collection and Treatment Systems
ASCE Manual 69, Manual of Practice on Sulfide in Wastewater Collection and Treatment Systems, is intended to help planners, designers, and operators of wastewater facilities understand...
POU/POE Devices: Availability, Performance, and Cost
In order to gather and summarize information and data on point of use/point of entry (POU/POE) devices, a committee was established by the Environmental Engineering Division of the American...
POU/POE Water Treatment: Regulatory Challenge
During the past few years the use of point-of-use (POU) and point-of-entry POE) water treatment devices has grown dramatically. One attendant consequence has been the proliferation of...
Use of POE/POU Technology at US Army Installations
A wide spectrum of adverse water quality characteristics has been experienced at US Army installations throughout the country. These characteristics, both interim and long-term in nature,...
Point-of-Entry/Point-of-Use Water Treatment-? Where Do We Go From Here?
The development and marketing of point-of-entry-entry/point-of-use (POE/POU) devices has become a multi-million dollar business, and is projected to become even larger with the annual...
Contact Stabilization Process Analysis and Formulation
In this paper, the contact stabilization process is analyzed. In comparison to the conventional activated sludge process, there are a larger number of independent design variables involved...
Application of Field Proven Fine Bubble Membrane Aeration Technology
Fine bubble membrane diffusers represent a significant technological advancement in diffused aeration technology by providing the consistently high transfer efficiencies of fine bubble...
Importance of Aeration Basin Detention Time in the Activated Sludge Process
Aeration basin detention time is a key design parameter for an activated sludge system at a wastewater treatment plant. The impacts of reducing the aeration time is illustrated by a case...
Control of
The paper reports on a study to determine the cause(s) of the biological imbalance and identify corrective measures. Project activities included: isolation and identification of filamentous...
Optimizing the Activated Sludge Process by Encouraging Futile Cycling
A study was conducted to demonstrate that cell yield in activated sludge processes can be decreased without increasing oxygen consumption by applying operating conditions that encourage...
Incremental Risk Analysis in Teaching Institutions
Institutions engaged in research and teaching in the natural sciences, constitute a diffuse source of chemical emissions. As many institutions embark on ambitious building programs, communities...
Risk of Waterborne Infectious Illness Associated with Diving in the Point Loma Kelp Beds, San Diego, CA
There is considerable interest in estimating the risk of bacterial and viral illness (i.e., disease, infection) associated with scuba diving in the Point Loma kelp beds located within...
Monte Carlo Simulations of Uncertainties in Risk Assessments of Superfund Sites Using Crystal Ball?
Most health risk assessments for Superfund sites combine a series of worst case assumptions to derive a 'point estimate' of risk that is 'conservative,'...
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