Gravity Band Filter

 

High Performance Liquid Filtration

A Gravity Band Filter (also called a gravity belt filter or gravity band filter press) is a simple, but highly effective mechanical filtration device. Gravity Band Filter’s are widely used in industrial applications for liquid-solid separation processes–primarily removing suspended solids or sludge dewatering.

Benefits:

  • Low Energy Consumption – Gravity is the primary driving force-no vacuum or pressure is required
  • Continuous Operation – System can run non-stop for extended periods of time, ideal for 24/7 processes
  • Low Maintenance – Minimal moving parts, with automated sludge and media handling reduce manual labor
  • Cost Effective – Lower capital and operating costs compared to more complex filtration systems
  • Eco Friendly Filtration Option – Reduces sludge volume before disposal and water can be reused in the process
How Our Gravity Band Filter Works
  1. Slurry Introduction
    • The influent slurry (liquid with suspended solids) is delivered onto the top end of a moving media filter belt (usually made of polyester or polypropylene mesh).
  2. Gravity Separation
    • The filter media is inclined slightly downward or laid horizontally.
    • As the slurry flows along the media, gravity pulls the liquid through the porous media while solids remain on top.
  3. Filtrate Collection
    • The filtered liquid (filtrate) drains through the media into a collection pan or tank below.
  4. Solids Transport
    • The media slowly moves forward (driven by a motor), carrying the retained solids with it.
  5. Solids Discharge
    • At the discharge end, the spent media and solids are dumped into a collection bin or conveyor for further processing or disposal.

 

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Common Use Applications

Industrial & Manufacturing

  • Metalworking fluids – filtering tramp oil, fines, and metal chips.
  • Automotive paint shops – removing paint sludge from rinse water.
  • Food processing – clarifying wash water, wastewater with organic material.
  • Textiles – filtering dye waste or lint-laden water.

Water & Wastewater Treatment

  • Polishing of wastewater effluent prior to discharge or reuse.
  • Sludge dewatering before land application or hauling.

Mining & Mineral Processing

  • Dewatering mineral slurries & clarifying process water.

 

Models Flow Range Inlet 150lb FLG Outlet 150lb FLG Dimensions LxWxH
ALBF2.5-30 65 – 150 GPM
15 – 30 m3/hr		 4”
DN 100		 6”
DN 150		 57” x 43” x 43”
1.4 x 1 x 1m
ALBF2.5-48 110 – 275 GPM
30 – 60 m3/hr		 4”
DN 100		 6”
DN 150		 57” x 61” x 43”
1.4 × 1.5 x 1m
ALBF3.25-48 145 – 365 GPM
35 – 80 m3/hr		 6”
DN 150		 8”
DN 200		 67” x 63” x 52”
1.7 × 1.6 × 1.3m
ALBF3.2-72 225 – 565 GPM
60 – 125 m3/hr		 6”
DN 150		 8”
DN 200		 67” x 63” x 52”
1.7 × 1.6 × 1.3m
ALBF4-72 280 – 705 GPM
75 – 160 m3/hr		 8”
DN 200		 10”
DN 250		 77” x 89” x 62”
1.9 × 2.2 × 1.5m
ALBF4-96 350 – 955 GPM
95 – 215 m3/hr		 8”
DN 200		 10”
DN 250		 77” x 113” x 62”
1.9 × 2.8 × 1.5m

 

 

Pattern Description
KB – Polyester
Cellulose Blend
KRAY – Rayon
KPS – Polypropylene
KT – Sonic Bonded
Composite
KP – 100% Polyester
KNYL – 100% Nylon

 

 

Standard

  • Electrical supply failure safety: Secures chamber seals and doors during power loss.
  • ALSI positive side seal
  • Media jog switch
  • NEMA 12 standard
  • Float style level control

Optional

  • Pump and stand
  • Sloped drain pan
  • Media index switch
  • Low level alarm
  • Filter flow alarm
  • NEMA 4/7
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