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Emerging Tech for Wastewater Treatment

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Emerging Tech for Wastewater Treatment ( emerging-tech-wastewater-treatment )

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Emerging Technologies Solids Removal prepared 2012 March 2013 Technology Summary Multi-stage Filtration Objective: State of Development: Very efficient removal of solids that contain Innovative. phosphorus and nitrogen, allowing compliance with stringent nutrient limits. Description: Very low limits on nutrients are difficult to meet without achieving very low effluent solids concentrations. Biomass solids are typically 8 to 10 percent nitrogen and 1 to 2 percent phosphorus by mass (Grady et al, 2011). If enhanced biological phosphorus removal is performed, the phosphorus content of the biomass can be increased to 6 to 8 percent (Grady et al, 2011). If chemical phosphorus removal is done, the metal phosphate precipitate (some of it colloidal) will have a substantial total phosphorus component. Therefore, although the discharge permit might allow 10, 20, or 30 mg/L total suspended solids, significantly lower total suspended solids could be required to meet the nutrient limits. Implementing filtration in series with a first- stage filter or first-stage clarifier and chemical addition between stages allows the finer colloidal particles that escape the first solids separation stage to be targeted. Some example systems that have shown good phosphorus removal performance are Trident HS, DynaSand D2, and BluePROTM. Trident HS uses a tube clarifier first stage followed by an adsorption clarifier and mixed media or upflow, moving-bed filter final stage. The Trident HS has been shown to achieve effluent total phosphorus of 0.02 mg/L (Liu, 2010). The DynaSand D2 uses two continuous-backwash, upflow-sand filters with a lamella settler applied on the backwash. Using chemical phosphorus removal, DyanSand D2 has achieved 0.01 mg/L average total phosphorus (Liu, 2010). The BluePROTM is a continuous-backwash, upflow-sand filter with adsorption media and can be used in series to achieve very low effluent solids levels. With two-stage BluePROTM, the WWTP at Hayden, Idaho, achieves total phosphorus between 0.009 and 0.018 mg/L (Leaf, 2007). Comparison to Established Technologies: Multistage filtration provides effluent solids quality better than single-stage sedimentation or filtration and approaching that provided by microfiltration membrane systems. Available Cost Information: Approximate Capital Cost: Equipment cost vary with technology and performance requirements Approximate O&M Costs: Operating costs include pumping. Vendor Name(s): Parkson – DynaSand 1401 West Cypress Creek Rd Fort Lauderdale, FL 33309-1969 Telephone: 1-888-PARKSON Fax: 954-974-6182 Email: technology@parkson.com Web site: www.parkson.com Blue Water Technologies, Inc. 10450 North Airport Drive Hayden, ID 83835 Telephone: 888-710-2583 Fax: 208-209-0396 Web site: http://www.blueH2O.net Siemens Industry, Inc. – Trident HS Water Technologies Telephone: 866-926-8420 or 724-772-1402 Web: www.water.siemens.com Installation(s): DyanSand D2 Manotick, ON Stamford, NY Walton, NY BluePROTM Hayden, ID Trident HS Couer d’Alene, ID 2-16 Wastewater Treatment and In-Plant Wet Weather Management

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