Optimum Depth and Spacing of Subsurface Drains
Optimization theory is used to minimize the cost of installation of subsurface drainage systems. The optimization problem is presented and constraints are identified. The analytic solution...

Interaction of Cable Roofs with Support Structure
Tensioned structures are becoming increasingly popular for covering large column free areas on account of efficient utilization of construction material, speedy construction and economy....

Estimation of Small-Scale Hydropower Potential
A statistical method of determining installed capacity and energy yield of potential small-scale hydropower sites is explored. Thirty watersheds with existing reservoirs were selected...

Improvement of Swirl Concentrator
The analysis of a treatment device for pluvial water, proposed by the American Public Works Association (APWA) and called a swirl concentrator, shows that its efficiency greatly depends...

Total Suspended Solids in Highway Runoff in Washington State
During the first year of full-time operation of ten highway runoff monitoring sites in the State of Washington, a total of 241 storms were sampled with a composite sampling system developed...

Microbial Activity in Activated Carbon Filters
To obtain information on the adsorption, bacteriological oxidation and desorption processes in filters, the oxygen consumption (ΔO2) and the removal...

Sewers and Cities: France and the United States Compared
The development and impacts of wastewater systems in France and the United States and their application for developing countries are discussed. Watercarriage technology was adopted in...

Algorithm for Optimal Activated Sludge Operation
A method for determining the minimum cost operation of an activated sludge wastewater treatment plant is developed and applied to a plant in Erie County, New York. The plant includes an...

Role of Surface Active Media in Anaerobic Filters
Equal-sized activated carbon and anthracite coal were compared when used as packing media in completely mixed anaerobic filters. Synthetic glucose and phenol bearing solutions and a diluted...

Rotating Biodisks Recarbonate Alkaline Wastewater
Lime addition to raw wastewater as an upgrading technique can significantly aid a rotating biological contactor (RBC) plant in producing effluents in compliance with federal discharge...

Anerobic Treatment in Novel Contact Digester
Laboratory studies are presented on a combined jet gas mixed and sludge blanket anaerobic contact digester with continuous sludge recycle. Raw piggery waste substrate is used as feed with...

1980 Needs Survey: Combined Sewer Site Studies
The U.S. Environmental Protection Agency is mandated by the Clean Water Act to prepare and report to the Congress a biennial estimate of the construction cost for publicly owned wastewater...

Models of Landfill Leaching: Moisture Flow and Inorganic Strength
Mathematical models are applied to the movement and inorganic contamination of moisture in sanitary landfills situated above the water table. The models are based on simple well-mixed...

Models of Landfill Leaching: Organic Strength
Mathematical models are applied to the dissolution, transport, and decay of organic materials in unsaturated sanitary landfills. The models are based on cascaded reactor concepts and on...

Hydraulic Regime and Activated Sludge Performance
The standard bio-kinetic theory used to describe the activated sludge process predicts that the soluble organic matter (SOM) concentration in the effluent of plug flow aeration tanks will...

One Uses His Umbrella When It Rains
The engineering profession unity movement is reviewed, with a brief explanation of the reasons for forming the American Association of Engineering Societies. A brief historical background...

Simplified Earthquake Analysis of Suspension Bridge Towers
Free vibration and earthquake response analyses of a simplified continuous analytical model representing suspension bridge towers (fixed at the base) are presented. In addition, various...

Suspension Bridge Response to Multiple-Support Excitations
The earthquake-induced vertical response of suspension bridges when subjected to, correlated or uncorrelated, multiple-support excitations is analyzed by means of random vibration theory....

Schwarz-Christoffel Theory of Flow Past an Opening
The Schwarz-Christoffel transformation for a steady two-dimensional plane flow past an eccentric, normal constriction of zero thickness is formulated. The transformation formula contains...

Simplified Bending Theory for Wire Rope
A theory has been developed to predict the static response of wire rope subjected to tension, torsion and bending. This type of loading occurs frequently in ropes wrapped around sheaves....

 

 

 

 

Return to search