Hydraulic Engineering Commons^™

Treatment Process Optimization At The Lee Hall Water Treatment Plant Newport News, Virginia, Marcy Granum Garnett

Civil & Environmental Engineering Theses & Dissertations

Various methods can be used in operating a water treatment plant. It is desirable to produce good quality water as efficiently and economically as possible. This study evaluates each phase of operation at the Newport News (Lee Hall} water treatment plant for overall efficiency.

This study begins by giving a detailed description of the Lee Hall water treatment plant. The description includes sources of water, a description of each treatment process, a plan view of the treatment plant, and a flow diagram of the treatment plant.

Based on the raw water data, flow rates, and the treatment plant characteristics, the …

Evaluating The Effects Of Alum With Polyelectrolyte Coagulant Aids In Treatment Of Low Turbidity Waters, Kenneth John Stockwell

Civil & Environmental Engineering Theses & Dissertations

Potable water sources usually require treatment for removal of suspended organic and inorganic particles. Conventional treatment processes incorporate chemical coagulants for removal of these suspended particles. Alum is a widely used coagulant that can provide adequate removals of turbidity. However, high alum dosages are required for treatment of low turbidity waters producing a voluminous sludge that is difficult to dewater.

Recent Federal regulations have limited disposal options for chemical sludges. This has prompted a reevaluation of coagulants and their dosages with the goal of reducing the amount of sludge produced and improving the sludge handling characteristics necessary for ultimate disposal. …

Transient Two Dimensional Ground-Water Flow: A Comparison Of Computed And Analytical Results, Robert Jan Fennema

Civil & Environmental Engineering Theses & Dissertations

The exact analytical solution of the transient-flow equation is compared with the finite difference solution. The finite difference program, written by the author, uses an iterative alternating direction implicit procedure to solve the linearized partial differential equation. A second order accurate central difference method is employed to solve the equation in two dimensions.

Variable cell spacing to divide the physical domain, a weighting factor and a time acceleration function were used to investigate rate of convergence and accuracy of the numerical solution. The exact integral solution to the one-dimensional form of the flow equation i n radial coordinates is used …

Hydraulic Analysis Of Surcharged Storm Sewer Systems, Don J. Wood, Gregory C. Heitzman

KWRRI Research Reports

Surcharge in a storm sewer system is the condition in which an entire sewer section is submerged and the pipe is flowing full under pressure. Flow in a surcharged storm sewer is essentially slowly varying unsteady pipe flow and methods for analyzing this type of flow are investigated. In this report the governing equations for unsteady fluid flow in pressurized storm sewers are presented. From these governing equations three numerical models are developed using various assumptions and simplifications. These flow models are applied to several example storm sewer systems under surcharge conditions. Plots of hydraulic grade and flow throughout the …