Assessing Roughing Filtration Design Variablesby Jennifer O. Cole,
M. Robin Collins,
Abstract: Rural communities are affected by the surface water treatment rule and are looking for inexpensive filtration options which are easy to operate and maintain. This paper evaluates roughing filtration design variables. Roughing filters are a simple inexpensive pretreatment method which have been successfully used prior to slow sand filters in developing countries. A roughing filters consists of a filter box divided into compartments, each filled with progressively smaller gravel media and may be operated horizontally, upflow or downflow. Orthogonally designed pilot filtration studies were successfully used to predict steady state treatment performance and the relative removal contribution of each design variable and their linear and quadratic trends. Also used is a multi-regression model which incorporates all results from the three particle type experiments and can predict steady state treatment performance by using settling velocity to differentiate influent particle type.
Subject Headings: Particle velocity | Filters | Steady states | Settling velocity | Hydrologic models | Fluid velocity
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