walnut shell filters
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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WALNUT SHELL FILTERS
SAIDU BALDE
JOSEPH PECSENYICKI
KORKU TETTEY
NAVJIWAN TINJAN
Chem 260 Project: 2013Produced by:
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INTRODUCTION
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Walnut shell filtration where sand filters formerly used:
more suitable for filtering free oil and suspended solidstreat oil field produced waterrefinery wastewatersteel mill direct spray and caster
waterethylene plant quench watercopper concentrate decant cooling water
(Slide information from [6])
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Reduces:
•Backwash water volume•Weight•Footprint
Suitable for off-shore oil production
(Slide information from [2])
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• mechanically separate solids (or free droplets) from solution
Filters
(Slide information from [3])
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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])
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Deep Bed (or Depth) filters
• droplets slowed in tortuous channels
• droplets attach to filter by some mechanism
Filter Type B
Image: http://www.nuts.com/nuts/black-walnuts/in-shell.html
Eg: black walnut shell filter
(Slide information from [3])
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Filter media
granules
Clear Path Tortuous Path
Flow
(Image: Joseph Pecsenyicki)
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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])
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Link to Flash Animation
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1. Click on link.2. Animation will load onto your default browser.3. Control+ or Control– to adjust screen size.4. Click anywhere on Flash screen to advance to next
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ADVANTAGES OF WALNUT SHELL FILTERSI
• 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])
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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])
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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])
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Supplemental
Information(Skimmed through in original presentation due to time constraints)
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COMPARISON OF MEDIA
Media Oil affinity quotientPolyvinyl chloride 0.212Anthracite 0.042Silica sand 0.043Black walnut shells 0.033
g of oil retained by cm3 of media
(Slide information from [3])
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BLACK WALNUT SHELLS
(Slide images from [2])
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MEDIA GRANULES
(Slide images from [2])
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OIL-COATED WALNUT SHELL GRANULES
(Slide images from [2])
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INDUSTRIAL-SIZED WALNUT SHELL FILTER
• Vertical vessel: 48 – 66 inch walnut shell media depth
(Slide images & information from [2])
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Longer run times
Longer media lifetime
Fewer suspended solids escape downstream
VERTICAL FILTRATION
(Slide image & information from [2])
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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])
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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])
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
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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
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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/