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Emerging Technologies Solids Removal prepared 2008 March 2013 Technology Summary DensaDeg® Process Objective: State of Development: Treatment of primary and tertiary effluents and wet Adaptive Use. weather flows. Description: The DensaDeg® process is a high-rate chemical and physical clarification process that combines sludge ballasted clarification and lamellar filtration, both established processes. The DensaDeg® process starts with the addition of a coagulant to destabilize suspended solids. The flow enters the rapid-mix tank for flash mixing to allow the coagulant to take effect then overflows into the reactor tank where sludge and polymer are added. A draft tube and mixer in the reactor allow for thorough mixing of the wastewater with the recirculated sludge and added chemicals. The sludge serves as a “seed” for floc formation providing a large surface area for suspended solids to bond to and is the key to DensaDeg®, allowing solids to settle out more quickly, thereby requiring a smaller footprint than conventional clarification. Wastewater flows over a weir from the reactor tank through a transition zone before entering the clarifier. The clarifier effectively removes the flow with help from settling tubes, allowing the tank size to be further reduced. Clarified water exits the process by overflowing weirs above the settling tubes. Sludge is collected at the bottom of the clarifier with a conventional scraper system and recirculated back to the reactor tank. Periodically, a separate sludge pump energizes and wastes a small portion of the sludge from the system. Scum is removed from the process at the top of the transition zone by a cylindrical collector that automatically rotates periodically. Several startup modes may be used for a full-scale DensaDeg®. If a wet weather event is expected within 6 hours of a previous wet weather event, the units should be shut down, but not drained. After 6 hours, the units may be drained except for three feet of depth in the clarifier. Both of these scenarios, which would include keeping the sludge collector running while the system is idle, would maintain a sludge inventory and a wet startup would ensue at the time of the next wet weather event. After 12 hours the tanks should be completely drained to prepare for a dry startup. Comparison to Established Technologies: Fundamentally, this process is very similar to conventional coagulation, flocculation, and sedimentation treatment technology. Both processes use coagulant for the destabilization and flocculent aid (polymer) for the aggregation of suspended materials. These materials are then subsequently removed by settling for disposal. The primary technical advance made in the DensaDeg® process is the recirculated sludge as a “seed” for the formation of high-density flocs for easy removal by settling. Chemical phosphorus removal is limited by kinetic factors as well as stoichiometric factors, and excessive inorganic precipitant requirements need to be reduced. Available Cost Information: Approximate Capital Cost: Cost estimates are dependent upon local requirements and specific applications. Approximate O&M Costs: Cost savings are linked to the relative ease of installation, operational flexibility, and low-energy consumption. Vendor Name(s): Infilco Degremont Inc. P.O. Box 71390 Richmond, VA 23255-1930 Telephone: 804-756-7600 Web site: http://www.infilcodegremont.com Installation(s): Turlock, CA Gainsville, GA T oledo, OH Halifax, Nova Scotia Shreveport, LA Breckenridge, CO 2-24 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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