In numerous liquid clarification applications involving moderate to high flow rates, the Filtertech Models SCF, HVSCF and FLA Flatbed Air Vacuum Filters provide the desired clarity by removing even the finest particles using a wide range of filter media. The filter uses a vacuum producer to generate a pressure drop across the filter bed which increases filtration efficiency. The Filtertech Model SCF Flatbed Air Vacuum Filter is available in a variety of configurations and sizes to meet specific requirements for numerous flow rates.
BENEFITS OF AIR VACUUM FILTRATION • The operating vacuum is generated totally independent of the liquid flow with a low HP vacuum producer, thereby offering flexibility of operation as the filter can operate without the vacuum producer.
• The air vacuum concept shears away the presence of potential tramp oil at the media entrance area to prevent premature “blinding” of the media since the filter bed is open to atmosphere.
• The air vacuum is used as a tool to dewater the solids on the discharged spent media resulting in drier solids.
• The vacuum producer allows natural aeration of the liquid to minimize the growth of anaerobic bacteria.
• The filter never goes off stream during the short movement of the filter media. The height of the liquid pool and vacuum allows an increased pressure drop across the media for very efficient filtration.
• The filter media indexing is very short to help prevent migration of extremely fine material into the clean section of the filter.
• The liquid level in the filter initially rises during the short index cycle thereby increasing pressure drop across the media. Should tramp/”free” oil be present, the oil can be decanted into optional internal collection troughs.
• The conveyor system is fully supported, not immersed into the dirty liquid and can use virtually any industrial type filter media including lightweight polyesters or high efficiency loft media as the media is carried through the filter.
• Automatic self-draining of the liquid during shut down.
• Very efficient double labyrinth side seals that do not rely on vacuum, mechanical adjustments or special elastomers to maintain sealing integrity of the filter media throughout the filter bed.
OPTIONAL FEATURES • Pre-coat and liquid extraction: The pre-coat option allows a portion of the flow to be intercepted during the very short indexing cycle whereby the same is recirculated allowing “pre-coat” of the incoming media using the dirt of the system. The liquid extraction feature allows for further dewatering of the spent media typically “free” of loose liquid.
• Control level indexing (CLI): The feature allows for a consistent liquid level within the bed of the filter for continuous but extremely slow indexing of the filter media. The feature minimizes migration of extremely fine particulate through the clean end of the filter media during movement. The controlled pressure drop across the media allows a consistent liquid level within the bed of the filter, while maintaining a maximum operating vacuum continuously thereby reducing operating energy.
• Internal Oil Skimming Troughs: Internally adjustable oil skimming troughs (see figure 6) to collect and automatically discharge accumulated tramp oil. The troughs are mounted within the filter bed, complete with internal piping, terminating in two 3” NPT (DIN 80) connections on the side of the filter.
• Vacuum producer long-coupled to the drive motor.
EQUIPMENT FEATURES - Standard • Reinforced steel construction
• Heavy-duty conveyor belt
• Conveyor support rollers
• Integral mist collector elements
• Low velocity inlet distributor
• Centrifugal vacuum producer
• Shear pin protected media drive
• Deep filter bed (Varies by Model)
• Low media sensor
• Constant operating vacuum
• Patented double labyrinth side seals
• Patented air flow modulator assembly
• Latching type index controls
• Prewired 24V DC devices to JIC junction box
Options • Controlled level indexing (CLI)
• Vacuum producer long-coupled
• Liquid extraction chamber
• Precoat zone
• Internal decantation trough
• Stainless steel construction (304 or 316)
• Semi-permanent media belt
• Spent media rewinder/sludge separator