Walnut Shell Filter Flux & Backwash Expansion Calculator

Size industrial black walnut shell media filters for produced water polishing, calculate filtration flux (m³/m²·h), and verify 40–50% fluidized bed expansion.

Produced Water Flow & Vessel Parameters

Water Feed Flow Rate Q (m³/h):

Design Filtration Flux (m³/m²·h): Typical: 20 to 35 m/h (8-14 gpm/ft²)

Number of Duty Vessels:

Settled Media Bed Depth L_0 (m): Standard depth: 1.2 m to 1.8 m (4-6 ft)

Media Effective Size d_10 (mm):

Backwash Upflow Velocity (m/h): Fluidization range: 35 to 55 m/h

Vessel Sizing & Bed Expansion

Vessel Inside Diameter (ID):

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Backwash Bed Expansion:

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Expanded Bed Depth L_exp:

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Freeboard Height Required:

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Total Media Volume per Vessel:

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Backwash Flow per Vessel:

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Frequently Asked Questions

Why are walnut shells preferred over silica sand for produced water deoiling?

Silica sand is strongly hydrophilic and permanently fouls when coated with heavy crude oil, cementing into impenetrable "mudballs." Walnut shell media releases oil readily upon fluidization and agitation, providing a multi-year service lifespan without media replacement.

What bed expansion percentage is ideal during backwashing?

An expansion of 40% to 50% ensures the media grains are spaced adequately for thorough particle-particle attrition scrubbing without risking media loss out the top discharge screens.