Reliability Analysis of Urban Water Supply
The high economic and environmental costs of large water supply projects are forcing engineers to consider not only alternative means of increasing system reliability, such as interconnections,...
Allowable Metal Contaminant Levels in Landfilled Sludge
Disposal of municipal sludges in dedicated sanitary landfills can be environmentally acceptable. Contaminants within the sludge present the potential for public health risks but these...
Manatee County Plans for Environmental Protection
Faced with a projected population increase of 53 percent by the year 2000, Manatee County, Florida, is protecting its water resources by developing a regional wastewater facilities program...
Research Needs in Land Application of Sludge?Hydrologic Effects of Soil-Sludge Interaction
The effects of wastewater sludge amendment on subsurface and surface flow regimes is discussed. The paper concludes with recommendations for further research on hydrologic effects of soil-sludge...
Elimination of Tidal Inflow?Bridgeport, CT
Using a program of sewer gauging, chloride sampling, sewer system analysis and treatment plant record review, it was determined that Bridgeport's old tide gates allowed 19...
Computer Control of Lift Station Operations
A unique computerized control system to supervise the operation of several lift stations has been designed by Boyle Engineering Corporation (Boyle) and constructed by the City of Orlando,...
Los Angeles Infiltration/Inflow Reduction Program
The City of Los Angeles maintains and operates two wastewater collection and treatment systems: the Hyperion System and the Terminal Island System. During the wet months of December through...
Quali-Continuous Simulation of CSOs
Providence, Rhode Island, has a combined sewer system. During and following a precipitation event the capacity of the system may be exceeded and a mixture of wastewater and urban runoff...
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...
Modular Plastic Media for Shallow Bed Trickling Filter Applications
Little specific data is available for less sophisticated trickling filter systems which employ recent plastic media designs for shallow bed filters without the added cost of subsequent...
Resource Recovery Mass-Burning Incineration
The various types of incineration systems are discussed, and the technical and economic factors to be considered in developing a resource recovery project are examined....
The Use of Activated Carbon as a Polishing Step for Treatment of Industrial Plating Wastewaters
An activated carbon adsorption process was utilized as a polishing step following the precipitation (hydroxide or sulfide) process. Zinc and cadmium were the metals studied. Since plating...
Direct Filtration of a Semiconductor Wastewater
A pilot plant study was conducted to determine the feasibility of direct filtration for the removal of metal precipitates from a semiconductor manufacturing wastewater. The pH of the acidic...
Factors Influencing Zinc Cementation of Cadmium
The research reported here examines an innovative procedure for removal of cadmium from wastewaters. This process is the cementation of cadmium by zinc metal. Cementation is highly attractive...
The Adsorption Characteristics of NI (II) Onto Bubble Surface
The removal of Ni(II) by foam fractionation is brought about by the electrostatic mechanism. From removal and zeta potential measurements, it clearly demonstrates that Ni**2** plus and...
Computer Simulation of Lime-Soda Softening of Cooling Waters
A computer model is developed to simulate the process of lime-soda softening of cooling waters. Results from the model are compared with those from a laboratory experimental study using...
In-Plant Testing for Evaluating Aeration Systems
In the fall of 1984, ASCE published a standard, Measurements of Oxygen Transfer in Clean Water. The standard, if used by the industry, should simplify evaluation of alternative aeration...
Measurement of Activated Sludge Rheology
Rheological measurements provide fundamental information on the physical properties of activated sludge. Such properties influence the behavior of activated sludge in wastewater and sludge...
Understanding Secondary Clarifier Behavior
The author has developed a graphic procedure for analyzing the hydraulic behavior of settling tanks. Data have been used in numerous cases to devise low cost in-tank and external improvements...
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