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Walnut shell filters

Walnut shell filters. SAIDU BALDE JOSEPH PECSENYICKI KORKU TETTEY NAVJIWAN TINJAN. Chem 260 Project: 2013 Produced by:. Introduction. Walnut shell filtration where sand filters formerly used: more suitable for filtering free oil and suspended solids

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Walnut shell filters

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  1. Walnut shell filters • SAIDU BALDE • JOSEPH PECSENYICKI • KORKU TETTEY • NAVJIWAN TINJAN Chem 260 Project: 2013Produced by:

  2. Introduction

  3. Walnut shell filtration where sand filters formerly used: • more suitable for filtering free oil and suspended solids • treat oil field produced water • refinery wastewater • steel mill direct spray and caster water • ethylene plant quench water • copper concentrate decant • cooling water (Slide information from [6])

  4. Reduces: • Backwash water volume • Weight • Footprint • Suitable for off-shore oil production (Slide information from [2])

  5. Filters • mechanically separate solids • (or free droplets) from solution (Slide information from [3])

  6. Filter Type A Surface filters – sieves (size exclusion) Eg: cheesecloth, coffee filters Image: http://www.bravilor.com/en-IN/product/filter-cups/110 (Slide information from [3])

  7. Filter Type B • Deep Bed (or Depth) filters • droplets slowed in tortuous channels • droplets attach to filter by some • mechanism Eg: black walnut shell filter Image: http://www.nuts.com/nuts/black-walnuts/in-shell.html (Slide information from [3])

  8. Clear Path Tortuous Path Flow Filter media granules (Image: Joseph Pecsenyicki)

  9. Droplets slowed in tortuous channels Droplets captured on walnut shell media via: • Direct collision • Diffusion • London force attraction • Surface charge attraction / repulsion (Slide information from [3])

  10. Link to Flash Animation http://chou-seh-fu.com/presentations/chem260/walnutShellFilterAnimation.html Click on link. Animation will load onto your default browser. Control+ or Control– to adjust screen size. Click anywhere on Flash screen to advance to next animation sequence. Click green back button to play previous animation sequence. Close browser when finished.

  11. Advantages of Walnut Shell Filters I Lightweight media Strong & elastic • less fracturing than sand • less flaking than anthracite Non-abrasive • less frictional damage to media than sand / anthracite (Slide information from [3])

  12. Advantages of Walnut Shell Filters II Can be ground into optimal size • sand grains are a little too small – require higher flow pressure Coalesces oil • easy to clean via water backwash (Slide information from [3])

  13. Conclusion • Walnut shell filters: • Saw adoption during early 1970s • Widespread due to: • Easy oil coalescence • Mechanical properties • Easy & chemical-free backwash properties (Slide information from [3])

  14. Supplemental Information (Skimmed through in original presentation due to time constraints)

  15. Comparison of Media g of oil retained by cm3 of media (Slide information from [3])

  16. Black Walnut Shells (Slide images from [2])

  17. MEDIA GRANULES (Slide images from [2])

  18. Oil-Coated WalNut shell granules (Slide images from [2])

  19. Industrial-sized Walnut Shell Filter • Vertical vessel: 48 – 66 inch walnut shell media depth (Slide images & information from [2])

  20. vertical Filtration Longer run times Longer media lifetime Fewer suspended solids escape downstream (Slide image & information from [2])

  21. oil removal • 100 PPM oil enters • Oil droplets > 2 μm ≈ 95% removal • Oil droplets > 5 μm ≈ 98% removal • < 5 PPM oil exits (Slide image & information from [2])

  22. Media requires aqueous wetting before use. Backwash: • Once per day Water backwash – no chemicals • 20-30 min. process 1% to wastewater Media attrition: 5% per year. (Slide images & information from [2])

  23. Sources [1] Abdallah, W., et al. (2007). Fundamentals of Wettability. Oilfield Review. Summer. pp. 44, 49. • [2] Howdeshell, M., Catalanotto, C. and Lorge, E. (Siemens) .“Walnut Shell Filter Reuse Potential.” 2011. Retrieved October 15, 2013 from http://www.sawea.org/pdf/Mike_Howdeshell.pdf [3] Kashaev, S. and Lee, D. (2010). Deep Bed Nutshell Filter Evolution. Retrieved October 27, 2013 from: http://www.exterran.com/Content/Docs/Products/Deep-Bed-Nutshell-Filter-Evolution-English-Letter.pdf • [4] Ian Mackay. Instructor, SAIT. Interview. Calgary, AB. November 4, 2013 [5] Kari McDonald. Instructor, SAIT. Interview. Calgary, AB. November 8, 2013

  24. Sources • [6] Siemens. “Auto-Shell™ Filter: Walnut Shell Filtration.” 2009. [Online]. Retrieved October 15, 2013 from http://www.water.siemens.com/SiteCollectionDocuments/Product_Lines/Monosep/Brochures/ZP-AUSH-DS-0310.pdf

  25. Additional References • Filtra Systems Technology. “Deep Bed Media Filter.” n.d. [Online]. Retrieved October 15, 2013 from: http://filtrasystems.com/products/deep-bed-media-filter/

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