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Emerging Technologies Solids Removal Actiflo® Process Objective: Treatment of primary and tertiary effluents. Description: March 2013 Technology Summary State of Development: Adaptive Use. prepared 2008 The Actiflo® process is a high-rate chemical and physical clarification process that involves the formation of suspended solids onto a ballast particle (microsand) followed by lamellar settling. It is considered an established process for the treatment of wet weather flows, but is also being applied to primary and tertiary effluents. The process starts with the addition of a coagulant to destabilize suspended solids. The flow enters the coagulation tank for flash mixing to allow the coagulant to take effect then overflows into the injection tank where microsand is added. The microsand serves as a “seed” for floc formation, providing a large surface area for suspended solids to bond to and is the key to Actiflo®. It allows solids to settle out more quickly, thereby requiring a smaller footprint than conventional clarification. Polymers may either be added in the injection tank or at the next step, the maturation tank. Mixing is slower in the maturation tank, allowing the polymer to help bond the microsand to the destabilized suspended solids. Finally, the settling tank effectively removes the floc with help from plate settlers allowing the tank size to be further reduced. Clarified water exits the process by overflowing weirs above the plate settlers. The sand and sludge mixture is collected at the bottom of the settling tank with a conventional scraper system and pumped to a hydrocyclone, located above the injection tank. The hydrocyclone converts the pumping energy into centrifugal forces to separate the higher density sand from the lower density sludge. The sludge is discharged out of the top of the hydrocyclone while the sand is recycled back into the Actiflo® process for further use. Screening is required upstream of Actiflo® so that particles larger than 3 to 6 mm do not clog the hydrocyclone. Several startup modes may be used for a full scale Actiflo® system. If a wet weather event is expected within 7 days of a previous wet weather event, the units should be shut down, but not put on standby. Wastewater would remain in the tanks and a wet startup would ensue at the time of the next wet weather event. In summer months, when freezing is not possible, the intermittent flush standby mode could be used; and when freezing is possible, the continuous flush standby mode should be used. These standby modes should results in a successful wet method, dry startup. (See also “BioActiflo®” process, Chapter 4.) Comparison to Established Technologies: Fundamentally, this process is very similar to conventional coagulation, flocculation, and sedimentation water 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 Actiflo® process is the addition of microsand as a “seed” and ballast for the formation of high-density flocs that have a relatively high-density microsand nucleus and are easily removed 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: Not disclosed by vendor. Approximate O&M Costs: Not disclosed by vendor. Vendor Name(s): Kruger USA 401 Harrison Oaks Blvd., Suite 100 Cary, NC 27513 Telephone: 919-677-8310 Fax: 919-677-0082 Email: krugerincmarketing@veoliawater.com Web site: http://www.krugerusa.com Installation(s): City of Greenfield, IN Lincolnton, NC Lawrence WWTP, IN Williamette WTP, OR Fort Worth, TX 2-22 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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