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Precoat Filtration
American Water Works Association
其他書名
M30
出版
American Water Works Association
, 1995-01-01
主題
Technology & Engineering / Environmental / General
Technology & Engineering / Environmental / Water Supply
ISBN
0898677874
9780898677874
URL
http://books.google.com.hk/books?id=MuHXBgAAQBAJ&hl=&source=gbs_api
EBook
SAMPLE
註釋
This manual explains applications and operation of precoat filtration, also called diatomaceous earth (DE) filtration, for potable water treatment.
In precoat filtration, unclarified water contaning foreign particles is forced, under pressure or by vacuum, through a layer of DE filtering media that has been deposited (precoated) on a septum. As the water passes through, suspended particles are captured and removed. Average DE pore sizes are much smaller than the pore sizes of conventional filter media, such as sand, allowing precoat filters to capture smaller particles than conventional filters. Perlite is also used as a precoat filter media.