phosphorus removal on dairies in the pacific northwest n.
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PHOSPHORUS REMOVAL ON DAIRIES IN THE PACIFIC NORTHWEST. Applying a Cone Shaped Fluidized Bed Phosphorus Crystallizer Ron Sheffield – U of Idaho Keith Bowers – Multiform Harvest Inc. Joe Harrison – U of Washington. Magnesium, Struvite Precipitation. Magnesium ammonia phosphate crystal

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PHOSPHORUS REMOVAL ON DAIRIES IN THE PACIFIC NORTHWEST


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phosphorus removal on dairies in the pacific northwest

PHOSPHORUS REMOVAL ON DAIRIES IN THE PACIFIC NORTHWEST

Applying a Cone Shaped Fluidized Bed Phosphorus Crystallizer

Ron Sheffield – U of Idaho

Keith Bowers – Multiform Harvest Inc.

Joe Harrison – U of Washington

magnesium struvite precipitation
Magnesium, Struvite Precipitation
  • Magnesium ammonia phosphate crystal
    • Similar to a Kidney Stone
  • Equilimolar concentrations of Mg, NH3 and PO4
  • Naturally occurring in waste systems
    • Overflow pipes, recycle elbows, pump impeller
    • Very common in municipal and swine waste systems
  • Historically produced slow release fertilizer
magnesium struvite precipitation1
Magnesium, Struvite Precipitation
  • Theory: Magnesium acts as a coagulant to settle out phosphorus.
  • How it Works: Magnesium, ammonium and phosphate ions when at a pH of 7 to 11 will combine to form Struvite (MgNH4PO4*6 H2O)
  • Removal Efficiency:
    • 90% reduction in SP from a swine anaerobic treatment lagoon in NC
slide5

Fluidized-Bed Struvite (MgNH4PO4) Crystallizer

Treated Effluent

Crystallizer Cone

Mg Dissolving Cone (optional)

Anhydrous Ammonia

Wastewater In

Mg

Harvested Struvite

4-20-0.25

Pilot Scale Crystallizer

2 gpm

si ellen farm
Si-Ellen Farm
  • 4,000 cow open lot
    • Flush feeding alleys
    • Primary Solids Removal – Slope Screen
    • Secondary Solids Removal – Gravity Basin
    • 3 Wastewater Storage Ponds - 18M gallons
werkhoven dairy
Werkhoven Dairy
  • 600 cow freestall
    • Flush manure handling
    • Primary Solids Removal – Gravity Basin
    • 3 Wastewater Storage Ponds - 18M gallons
  • Wastewater Analysis
    • TP = 85 mg/l
    • PO4 = 25.4 mg/l
    • pH = 7.8
crystalline product
Crystalline Product
  • Advantages
    • Non-sludgy
    • Crystalline structure
    • Easily dried and handled
    • Concentrated Fertilizer - 4:20:0.25 Average ID analysis
    • Organic Product???
  • Limitations
    • Slow Release
    • Low Nitrogen
conclusions
Conclusions
  • Cone shaped fluidized bed crystallizer was successful in removing P from dairy wastewater
  • TP removal was observed to be lower than as demonstrated with swine lagoon wastewater
  • PNW dairies showed higher Mg and TAN: possibly reducing TP removal via struvite harvesting
next steps struvite crystallization
Next Steps…..Struvite Crystallization
  • Acidification Pre-Treatment
    • pH, retention time
  • Portable Struvite Crystallizer
    • Trailer mounted
    • Evaluate various wastewaters
  • Full-Scale Crystallizer: >10M gallons/year
  • Organic Certification
  • Crop Response
next steps anaerobic digestion
Next Steps…..Anaerobic Digestion
  • Phosphorus Pretreatment
    • Digester not for energy production rather as P removal systems
    • Investigate lowest Hydraulic Retention Time (HRT) to achieve highest PO4:TP
    • Smaller & Cheaper digester
    • Follow with Struvite Crystallization