DynaSand EcoWash Brochure

Continuous, Upflow, Granular Media Filter – Continuously cleaned sand bed – Low power requirement – Elimination of ancillary backwash equipment – Reduced operator attentionThe DynaSand® filter is an upflow, deep bed, granular media filter with continuous backwash. The filter media is cleaned by a simple internal washing system that does not require backwash pumps or storage tanks. The absence of backwash pumps means low energy consumption. The DynaSand® filter’s deep media bed allows it to handle high levels of suspended solids. This heavy-duty performance may eliminate the need for pre-sedimentation or flotation steps in the treatment process in some applications.Great performance, low maintenanceThe DynaSand® filter is available in various sizes and configurations. This flexibility allows for customization to fit specific site and application requirements.DynaSand® Filter Principles of OperationInfluent FiltrationInfluent feed is introduced at the top of the filter (A) and flows downward through an annular section (B) between the influent feed pipe and airlift housing. The feed is introduced into the bottom of the sand bed through a series of feed radials (C) that are open at the bottom. As the influent flows upward (M) through the downward moving sand bed (D), organic and inorganic impurities are captured by the sand. The clean, polished filtrate continues to move upward and exits at the top of the filter over the filtrate weir (J) and out through the effluent pipe (E).Sand CleaningThe sand bed containing captured impurities is drawn downward into the center of the filter where the airlift pipe (F) is located. A small volume of compressed air is introduced at the bottom of the airlift, drawing the sand into the airlift pipe. The sand is scoured within the airlift pipe at an intensity of 100-150 SCFM/ft2. The effectiveness of this scouring process is vastly greater than what can be expected in conventional sand filtration backwash. The scouring dislodges any solid particles attached to the sand grains. The dirty slurry is pushed to the top of the airlift (G) and into the reject compartment (H). From the reject compartment, the sand falls into the sand washer (I) and the lighter reject solids are carried over the reject weir (K) and out the reject pipe (L). As the sand cascades down through the concentric stages of the washer, it encounters a small amount of polished filtrate moving upward, driven by the difference in water level between the filtrate pool and the reject weir. The heavier, coarser sand grains fall through this small countercurrent flow while the remaining contaminants are carried back up to the reject compartment. The clean, recycled sand is deposited on the top of the sand bed where it once again begins the influent cleaning process and its eventual migration to the bottom of the filter. FEED RADIALS (C)AIRLIFT HOUSING (N)UPWARD FLOWINGFILTRATE (M)SAND WASHER (I)TOP OFAIRLIFTPIPE (G)FILTRATE WEIR (J)DOWNWARD MOVINGSAND BED (D)INFLUENT ANNULARS (B)BOTTOM OF AIRLIFT PIPE (F)REJECT COMPARTMENT (H)REJECT WEIR (K)REJECT PIPE (L)INFLUENT PIPE (A)EFFLUENT PIPE (E)DynaSand® fi lter above ground package unitsDynaSand® fi lter modules in concrete basinFeatures – Continuously cleaned sand bed – No underdrains or screens – Sand washed with filtrate – No level control – Internal, vertical airlift – Low power requirementsBenefits – No shutdown for backwash cycles – Elimination of ancillary backwash equipment – No flow control valves, splitter boxes, or backwash controls – No short-circuiting – Optimum sand-washing efficiency – Superior filtrate quality – Reduced operator attention – Minimizes overall pressure-drop – Reduces potential for pluggage – Significantly reduces wear/maintenance – Can be easily maintained without filter shutdown – Up to 70% less compressed air vs. other self-cleaning filtersDynaSand® Filter ConfigurationsThe DynaSand® filter is available as either stand alone package units or in a modular concrete design. The package units are constructed of either 304 SST or FRP. Materials of construction for the internal components of both package and concrete units are SST and/or FRP. Filters are available in 40” standard bed or 80” deep-bed design depending on the nature of the application. Concrete modules are frequently used for high flow capacity systems by placing multiple modules into a common filter cell. The modules in a filter cell share a common filter bed where cones at the bottom of each module distribute sand to their respective airlifts and sand washers. A concrete DynaSand® installation can be designed for any size filter area. This enables the technology to be applied to any size water or wastewater treatment plant. Since all filter beds are being continuously cleaned, the pressure drop remains low and even throughout all the filters. Equal pressure drop ensures even distribution of feed to each filter without the need for splitter boxes or flow controls. Therefore, a typical multiple unit installation can use a common header pipe with feed connections and isolation valves for each filter. SAND BEDCONTINUOUSLY MOVINGDOWNWARD TO BASEOF AIRLIFT DIRTY REJECTEXITING SYSTEMDRAIN MANIFOLD(IF REQUIRED)NO PLENUM(THIS VOLUME IS CONCRETE-FILLED)DIRTY SAND ENTERINGBASE OF AIRLIFT PUMPAIR SUPPLY CHAMBERAIRLIFT PUMP HOUSINGFEEDRADIALSFEEDASSEMBLYINFLUENTFEEDMANIFOLDCONTROL PANELINFLUENT OR FEED CHANNELAIR SUPPLY LINESEFFLUENT OR FILTRATE WEIREFFLUENT OR FILTRATE CHANNELDynaSand® Continuous Filtration ProcessWater and wastewater treatment in conventional plants typically involves flocculation, clarification and filtration. Direct filtration eliminates clarification but still requires flocculation. The DynaSand® filter utilizes a proprietary process known as Continuous Contact Filtration. The DynaSand® filter’s 80” media bed depth provides greater hydraulic residence times and more opportunity for floc formation and attachment. Thus, coagulation, flocculation and separation can be performed within the sand bed, eliminating the need for external flocculators and clarifiers. Equipment savings can be substantial, up to 85% compared to conventional treatment and 50% compared to direct filtration. The DynaSand® Continuous Contact Filtration process is better suited to remove small floc, which can help reduce chemical requirements by 20-30% over conventional treatment.ApplicationsThe DynaSand® filter is currently providing exceptional treatment in over 8,000 installations worldwide in a wide variety of applications.DynaSand® Filter Applications – Tertiary filtration – Algae removal – Potable water (turbidity and color) – Oil removal – Process water – Brine filtration – Metal finishing – Cooling tower blowdown – Steel mill scale – Chemical processing – Phosphorus removal – Product recovery – Denitrification – Cryptosporidium and Giardia removal – Surface water – Ground water – Arsenic removal – Effluent reuseFort LauderdaleChicagoMontrealDubaiMumbai1.888.PARKSONtechnology@parkson.comwww.parkson.comTypical Data Loading rate (gpm/ft2)Influent solidsFiltrate solidsTertiary Filtration 3-5 20-50 ppm SS 5-10 ppm SSPotable Water – Turbidity 4-5 10-30 NTU 0.1-0.5 NTUPotable Water – Color 4-5 10–120 ACU 1-5 ACUProcess Water 5 10-30 NTU 0.1-0.5 NTUMetal Finishing 4-6 20-50 ppm SS 2-5 ppm SSSteel Mill Scale 8-10 50-300 ppm SS 5-10 ppm SSPhosphorus Removal 3-5 <1 ppm Total P <0.1 ppm Total PAlgae Removal 2-4 100 ppm SS 10-20 ppm SSDenitrification 3-4 10-15 ppm TN <3 ppm TNOil Removal 2-6 <50 ppm O&G 5-10 ppm O&GRaw water RejectsEf?uentInline mixerSCADA control systemSludge wasteLamella® Gravity Settler Inclined Plate Settler(optional)DynaSand®Continuous, Up?ow,Granular Media FilterAnalyzerEf?uent recirculationCarbonCoagulantsFILT-DSF_091812