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Geotextile behavior relevant to filtering low density suspended organic particles
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|Title: ||Geotextile behavior relevant to filtering low density suspended organic particles|
|Authors: ||Marino, Roger Joseph|
Martin, Joseph P.
|Keywords: ||Geotextiles;Filters;Suspended Solids;Permittivity;Water Quality|
|Issue Date: ||22-Sep-2006|
|Citation: ||Presented at the 8th International Geosynthetics Conference. Yokohama, Japan.|
|Abstract: ||This paper describes experiments on the feasibility of using geotextiles to filter organics from runoff and combined sewer overflows. A horizontal flow permittivity test apparatus was used as a prototype to test 15cm x 20cm coupons. Non-woven, needle-punched products supported both depth (interior) and cake(surface) filtration modes. Crushed anthracite in the #100-#200 mesh range was used as an inert, replicable analogue of low density, irregularly shaped suspended particles. The AOS detected with this material differs from that measured with standard media, indicating different interaction with the geotextile pore structure.Drag forces maintained a cake on the upstream face of the filter even at low hydraulic gradients. The permittivity decreased as this coating thickened. When flow ceased, the organic cake sloughed off the upstream face of the coupon. Measurements made after several doses showed recovery of much of the original permittivity, with the loss in hydraulic capacity attributed to embedment of particles in the matrix.|
|Appears in Collections:||Faculty Research and Publications (CAEE)|
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