How To Estimate The Run Duration Of A Horizontal-flow Roughing Filter
Author(s)
D. Sittivate
Abstract
How to estimate the run duration of a
horizontal-flow roughing filter
D. Sittivate
Dept. of Rural Technology, Thammasat University,Pathumthani, Thailand.
Abstract
Among pre-treatment methods used before slow sand filters (SSF), horizontal-
flow roughing filters (HRF) have been found to be the most effective and
appropriate for developing country application. This is because they are simple,
require no mechanical parts, have low capital cost, can be operated for a long
time due to their high solids retention capacity, and with a wide variety of raw
surface water characteristics. Most research on HRFs has concentrated on
turbidity (solids) removal whereas the way to estimate and design the run
duration time before filter (HRF) cleaning is necessary has received little
attention. In this research, a large gravel (size 10-20 mm) filter media were placed
as a single package, uncovered and outlet at the top. It was found that the
laboratory-scale filters used in this st
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