Sediment Filter Bags
Wastewater Treatment Plant Dewatering Project
Question: I am looking into using sediment filter bags on a project site. I am the design engineer for the project and need advice on sizing. The sediment is mostly silty-clay. We are building an expansion to a wastewater treatment plant. The largest thing will be the oxidation ditches, which will be a huge hole in the ground. I was thinking that we might use sediment filter bags for dewatering. The area of the ditches will exceed 60,000 sq. feet, but I can get a more accurate number later.
Answer: Our Sediment Filter Bags are fabricated using heavy duty needle-punched filter fabric (nonwoven geotextile) which provides high permittivity (water flow). The fine pore structure allows water to flow through freely, while preventing sediment from piping through. Another option is woven monofilament, ideal for high flow, rugged, high tensile applications.
Standard dewatering sediment filter bag sizes are range from 6' x 6' to 15' x 25' in either an 8 oz or 10 oz nonwoven geotextile.
For more information on sizes and specifications, please see our Dewatering Bag Product Flyer.
Sediment Filter Bag Details
Sediment filter bags should be sized based on the volume of water being pumped (pump flow rate), quantity and type of sediment, and the permittivity of the given bag size. Consideration should also be given to location. (Steep sloped surfaces are typically not recommended as the filter bag may roll). Placement may be in a 20’ drop box, dump truck, or similar container to facilitate transportation. Each sediment filter bag can handle a 2”, 3”, or 4” discharge hose. (The hose can be placed along any edge by making a small incision into the fabric, inserting the hose, and then clamping the fabric to the hose via wire, ties, clamp, rope, or similar to create a good seal.)
Learn more about Dewatering Bags and Silt Filtration Products.
Geotextile Dewatering Tube
For more demanding jobs, the Geotextile Dewatering Tube is one of the most reliable options available. Made from an extra strong woven geotextile fabric, it accommodates larger sediment requirements, higher flows, and more demanding products. Sizing for dewatering tubes begins at 50'; the largest standard size is 250' with custom sizing also available.
Dewatering tubes have been used in some of the following applications:
- Beach Erosion Prevention
- Waste Water Plant Treatment
- Lake and Pond Dredging
- Shoreline Build Up
- Large Scale Sludge Dewatering