Dewatering Bags to Handle Septage
Bag Filter for Sludge Dewatering
Question: I need dewatering bags to handle septage. What is the sludge bag capacity? Do you have the polymers to go with it? Are the bags woven or punched? What about cost? I need the dewatering bags best for wastewater.
Answer: We offer a couple of different options for sludge dewatering equipment – dewatering bags and dewatering tubes.
Typically, Dewatering Bags are made from a nonwoven, needle-punched geotextile. This type of fabric has small pores that allow water to filter out of the geotextile bag, while still being able to retain sediment, silt, sand, and other small materials from the septage treatment process. Dewatering Tubes can handle larger capacities, so are helpful for bigger projects.
Dewatering Bags vs Dewatering Tubes
Dewatering bags are typically constructed of either an 8 ounce or 10 ounce nonwoven geotextile fabric. The sludge bag has been made out of a 6 ounce as well, depending on the requirements of the project. Most sludge dewatering jobs will use the 8 ounce material. New dewatering bags allow about 65 gpm or less to filter through the bag. This may decrease as the bags begins to fill up with materials.
If woven geotextile fabric is desired, we also offer dewatering tubes. Compared to the geotextile bag, the tubes are significantly larger in size and ideal for projects requiring the removal of sludge or septic waste. Tubes come in lengths up to 250 feet and circumferences up to 90 feet, as well as custom options. The wide sizing range helps meet various storage requirements for the septage treatment process as well as spacing concerns.
Dewatering Process and Capacity
For proper dewatering procedures, dewatering bags and tubes are filled to 85 percent capacity with sludge or slurry mixture. Given time, the solids consolidate and settle in the bag. The process is repeated until consolidated solids take up at least 85 percent of the total sludge bag capacity.
Dewatering and consolidation rates vary between projects, depending on the materials mix and conditions of an area. Once the dewatering process is finished, consolidated materials should be removed for disposal or used as fill or compost.
Dewatering with Polymers
Polymers are thickening agents which can increase the rate at which the solids in sludge or septic waste separate from water. Depending on the pump rates, TSS ratio, and any site limitations, polymers could speed up flocculation times. Polymer use must be carefully monitored through the dewatering process with periodic beaker test to ensure proper use. Please contact a polymer specialist when using dewatering polymers in any septage treatment process.