The Sewer Department of Lebanon, Tenn., operates an extended air-activated sludge treatment plant. Excess solids under aeration were cycling up, but the one-meter belt press could not run fast enough or long enough to dewater the inventory.Superintendent Billy Dranes consulted Liquid Solids Separa-tions in Butler, Tenn., which recommended geotextile tubes as a more cost-effective dewatering technology than contracting for a mobile belt press.Three 60- by 100-foot-long TitanTubes from Flint Industries Inc. brought the sludge inventory into the proper mixed liquor suspended solids range within two weeks. The dewatering process also achieved better dissolved oxygen profiles and lower sludge blankets, resulting
