Water & Wastewater DynaSand® Filter Continuous Up flow Sand Filtration Cost-effective, Continuous Filtration with Internal Washing System DynaSand® is a continuously operating sand filter with an internal washing system which eliminates the need for wash water storage tanks, backwash pumps and collecting tanks. Applications • Drinking water treatment. • Industrial effluent treatment and water supply. • Recovery and reuse of water. • Treatment of wastewater before discharge. Advantages • • • • • • • • • • • No first filtrate. Always clean effluent. No shock loads on the wash water treatment system. Handles high suspended solids without the need for pretreatment. Low head loss. Low energy consumption. Low supervision and maintenance costs. No need for backwash pumps, wash water storage or wash water collecting tanks. No automatic valves or air scour blower. No clogging filter bottom nozzles. Single media filter bed. Available as a freestanding unit or as filter modules for installation into a concrete basin. How it Works The water to be treated (red arrow) is admitted through the inlet distributor (1) in the lower section of the unit and is cleaned as it flows upwards through the sand bed, prior to 2 5 7 6 discharge (blue arrow) through the filtrate outlet (2) at the top. The sand containing the entrapped solids is conveyed 8 from the tapered bottom section of the unit (3), by means of an airlift pump (4), to the sand washer (5) at the top. Filtered Water Zone The DynaSand® filter is based on the counter flow principle. Cleaning of the sand commences in the pump itself where impurities are separated from the sand grains by the Sand Bed Zone turbulent mixing action. The contaminated sand spills from the pump outlet into the washer labyrinth (6) in which it is washed by a small counter current flow of clean water. The separated solids (brown arrow) are discharged through the wash water outlet (7), while the grains of clean sand (which are heavier) are returned to the sand bed (8). As a result, 1 the bed is in slow, constant downward motion through the Entrapped Solids Zone unit. Compressed air for the sand pump is provided by via the control panel. 3 Thus, water purification and sand washing both take place continuously enabling the filter to remain in service without interruption. 4 turning water around ...® Tel: 01353 645700 • Fax: 01353 645702 • www.hydro-international.biz

Wa te r & Wast ewate r DynaSand® Continuous Contact Filtration Production of process water and drinking water from river or lake water. The process can also be used for certain wastewater applications. Flocculation chemicals are mixed into the feed stream of the DynaSand® filter(s). No flocculation tanks are required. Pre settling can be eliminated because of DynaSand®’s ability to handle high concentrations of suspended solids. Process Water Recycling Reduces water consumption and permits full control of water Wash Water Outlet Filtrate Outlet Sand Washer Washer Labyrinth quality. DynaSand®...