Water & Wastewater DynaSand®Oxy Ammonia Removal with Tertiary Filtration Cost-effective, Continuous Filtration with Ammonia Removal A continuous sand ltration system with air addition to facilitate removal of ammonia from wastewater. Advantages Continuous process as DynaSand® with the addition of ammonia removal. Ammonia, suspended solids and BOD removal in a single stage. Low ammonia consents achieved. Peak inlet concentrations handled. Efcient, easy operation. Stand alone addition to the works. • • Applications • Wastewater treatment works. • Industrial efuent treatment. • • • • How it Works The DynaSand®Oxy lter, like the DynaSand® lter, is based Feed Washer Filtrate 2 on the counter ow principle. The water to be treated (red lower section of the unit and is cleaned as it ows upwards through the media bed, prior to discharge (blue arrow) Filtered Water Zone 5 arrow) is admitted through the inlet distributor (1) in the 7 Wash Water 6 through the ltrate outlet (2) at the top. To ensure that the autotrophic nitrifying bacteria have sufcient oxygen and carbon dioxide to convert ammonia 8 to nitrates, aeration hoods fed by process air (green arrow) are sited within the upper layer of media to provide sufcient aeration. The resultant nitrates remain dissolved in the water. Air Lift Pump Nitrication Zone The media containing the entrapped solids is conveyed from the tapered bottom section of the unit (3), by means of an airlift pump (4), to the media washer (5) at the top. Air Cleaning of the media commences in the pump itself where impurities are separated from the media grains by the turbulent mixing action. The contaminated media spills from the pump outlet into the washer labyrinth (6) in which it Process Air is washed by a small counter current ow of clean water. Filtration Zone The separated solids and sloughed biomass (brown arrow) are discharged through the wash water outlet (7), while the Aerator grains of clean media (which are heavier) are returned to the media bed (8). As a result, the bed is in slow, constant 1 downward motion through the unit. Compressed air for the Feed Distributor Thus, water purication and media washing both take place 3 continuously enabling the lter to remain in service without interruption. 4 Entrapped Solids Zone air lift pump is provided via the air distribution panel. turning water around ...® Tel: 01353 645700 • Fax: 01353 645702 • www.hydro-int.com

Water & Wastewater DynaSand®Deni Nitrate Removal with Tertiary Filtration Cost-effective, Continuous Filtration with Nitrate Removal A continuous sand ltration system with carbon addition to facilitate removal of nitrates from wastewater. Advantages • • Applications • Wastewater treatment works. • Industrial efuent treatment. • • • • Continuous process as DynaSand® with the addition of nitrate removal. Nitrate, suspended solids and BOD removal in a single stage. Low total N consents achieved. Peak inlet concentrations handled. Efcient, easy operation. Stand alone addition to the works. How it...