Dry Wash Tech Brief

Durco Filters Biodiesel Equipment

Dry Washing & Filtration Systems For Small (<10MM gal/yr) to Large-Scale (>10MM gal/yr) Biodiesel / Biofuel / WVO Plants

Durco Filters Biodiesel Dry Washing & Filtration Process

Biodiesel Silicate Dry Wash
Biodiesel Dry Wash Process

Step One: Dry Washing

This step employs a magnesium silicate mixing and adsorption process to quickly separate contaminants away from the purified biodiesel product:

Following transesterification, the unwashed biodiesel stream is sent to the mixing tank. Here a small amount of magnesium silicate adsorbant is intimately combined with the unpurified biodiesel to complete the "dry-washing" process.  The result is a biodiesel stream with the impurity-laden adsorbant in suspension.

Step Two: Filtration

After the short dry washing step, the process stream is then sent through a biodiesel filter that separates the purified biodiesel liquid from the dry wash adsorbant.

Two (2) Proven Filtration Technologies For the Filtration Step

Following the Dry Washing Step, a Filtration Step is required to remove contaminated adsorbent, and any other particulate, down to the sub-micron level. There are two (2) highly proven filtration technologies, but only one of these will provide optimum performance in your specific process:

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Process Considerations

Filter Press

Pressure Leaf Filter

Production Volume
(per single unit)
<=10MM gal/year Vertical Models >6MM gal/yr
Horizontal Models >10MM gal/yr
Process Type Batch / Continuous Batch/Continuous
Operational Mode Manual / Semi-Automatic Manual / Semi or Full Automatic 
Operational Temperature Up to 170°F (77C)  No Limits
Cost Low Capital Cost
Low Operating
Intermediate Capital Cost
Low Operating Cost
Typical Lead Time 8-12 Weeks  16-24 Weeks

Durco Filters Biofuel Filter Press (<10MM gal/Yr)

 EP Press for Biodiesel Dry Wash (4MM gal/yr)
Durco Filters 4MM gal/yr Biodiesel Dry-Washing System

Features and Benefits

  • Lower Capitol Investement Up to 10M gal/year
  • Safe, Easy Operation
  • Process Temperatures Up To 170F (77C)
  • Sub-Micron Particulate Removal
  • Removes Glyceral, Free Fatty Acids, Soluble and insoluble impurities
  • Pneumatic / Hydraulic or Manual closure systems
  • Easily Expandable for Increased Capacity
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Durco Filters Biofuel Pressure Leaf Filter

Features and Benefits

  • Constant Flowrates in a Batch Operation
  • High Flowrates & Long Cycle Times
  • Easily Handles Upset Loading
  • Sub-Micron Removal
  • No Operator Contact with Waste
  • Ultra-Efficient Cake Discharge Vibrator
  • DuraSluice™ Wash System (option)
  • ASME, NACE, and API Standards
  • High Temperature / Pressure Designs
  • Total Range of Control Options
  • Available as Complete Systems (option)
Biodiesel PressureLeaf Inst
Durco Filters 10MM gal/yr Biodiesel Dry-Wash Pressure Leaf Filter
Biodiesel Cake Development
Actual Cake Developed in Above Filter
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With the right choice of filter technology, a wide range of suspended solids (typically 1-3%, by weight) can be removed. This is, in part, dependant on the specific size of your large-scale biodiesel production operation and several other critical process factors, such as:

  • Manual, Semi Automatic, or Fully Automated Operation.
  • Employment of Optional fail-safe bag filter station.
  • Continuous operation or batch processing

We can design and build your Biodiesel Dry Wash and Filtration system to accomodate any of these requirements.

The end result is a clean biodiesel product that is now ready for storage and the solid by-product may be sold for a variety of uses including animal feed or fertilizer.

Durco Filters Biodiesel Dry Washing & Filtration Systems Benefits:

    • Biodiesel / Biofuel processing time
      • Thru complete elimination of the need for an oil/water emulsion separation stage or a drying stage.
    • Plant start-up & operating costs
      • Thru complete elimination of the capital and maintenance associated with traditional washing equipment.
      • Smaller footprint than traditional water wash or bubble wash equipment.
    • Environmental impact
      • No water effluent waste streams, which are normally hazardous by-products of traditional biodiesel washing and drying techniques.
  • Supersedes Traditional Water Washing or Bubble Washing Equipment to Achieve:
    • Highly efficient separation of the transesterified biodiesel process stream into clarified biodiesel (methyl-ester) end-product
    • Recyclable by-product.
  • A unique magnesium silicate dry wash process to achieve large-scale production of high quality biodiesel / biofuel, capable of meeting or exceeding ASTM-D6571 requirements.
    • Pilot-scale testing facilities are available to validate product specifications for Your specific biodiesel / biofuel process in your specific plant.

Durco Filters Biodiesel Dry Washing And Filtration Systems are available as complete turnkey packages. Individual filter units can also be integrated into existing large scale biodiesel / biofuel production, or indeed any large-scale general silicate (ex. Magnesol or Trisyl Silica) filtering plant.


By choosing the optimum Durco Filters technology, any dry washing or other particulate filtering system can be configured to handle a wide range of flow rates from virtually any industrial process stream. Batch or continuous production operations can both be supported.

Consult a Durco Filters Biofuel Application Engineer to arrange testing and analysis of your biodiesel / biofuel process stream and determine the optimum filtration technology for your particular operation.  You can call +1.716.693.9381, email This email address is being protected from spambots. You need JavaScript enabled to view it., or fill out one of our Filtration Fast Track Form and one of our Application Engineers will get back to you right away.

Pressure Leaf Filters
Sludge Dryers
Tubular Backwash Filters
Pressure Nutsche
Filter Presses