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Implementation of Montana’s 1st Membrane Bioreactor (MBR)
PNCWA 2012 Boise, ID
Jeff Ashley, P.E. Morrison-Maierle, Inc.
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Presentation Outline 1. Facility Planning
2. Project Phasing
3. MBR Equipment Pre-Selection
4. Design
5. Construction & Startup
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Presentation Outline 1. Facility Planning
2. Project Phasing
3. MBR Equipment Pre-Selection
4. Design
5. Construction & Startup
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Bigfork, Montana
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Flathead Lake
Kalispell
Missoula
Bigfork
Helena
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Facility Planning • Aging trickling filter plant (1980’s) BOD removal
• Effluent filtration for Phosphorus removal
• Small Site (~ 1 acre)
• Outfall to Flathead Lake
• Facility planning efforts initiated in 2006 Preliminary Engineering Report (PER)
Grant / loan application
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Facility Planning • 30-day Avg. Permit Limits (expired in 2006):
BOD / TSS 30 mg/L
Total Nitrogen (TN) 152 ppd
Total Phosphorus (TP) 1.0 mg/L
E.coli 32
• Current Influent Flows: Avg. Day = 0.23 mgd
Max Day = 0.40 mgd
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Facility Planning • Bigfork seasonal tourist economy
• Service Population Year round residents (~1,500)
Seasonal residents (~30% increase)
Tourists (~25% increase)
• ~ 5% per year residential growth (2006)
Influent flow increase to plant
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Facility Planning • Existing Permit Limits (2006):
BOD & TSS 30 mg/L TN 152 ppd TP 1.0 mg/L E. coli 32
• Potential Permit Limits: BOD & TSS 10 mg/L TN 10 mg/L TP 0.5 mg/L E. coli 32
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Facility Planning • Existing Permit Limits (2006):
BOD & TSS 30 mg/L TN 152 ppd TP 1.0 mg/L E. coli 32
• Potential Permit Limits: BOD & TSS 10 mg/L TN 10 mg/L TP 0.5 mg/L E. coli 32
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12 Condos
Highw
ay ROW
Neighbor
Neighbo
r
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Facility Planning • New permit issued in 2010
• 2010 Interim Permit Limits (30-day avg): BOD & TSS 22 mg/L TP 1.0 mg/L E. coli 32
• 2013 Final Permit Limits (30-day avg): BOD & TSS 22 mg/L TN 15 mg/L (max month Q) TP 1.0 mg/L E. coli 32
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Facility Planning • PER investigated several options to meet
future flows & effluent limits:
Membrane Bioreactor (MBR) Sequencing Batch Reactor Relocate Plant
• Detailed evaluation of economic and non-economic factors of each option
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Facility Planning • PER investigated several options to meet
future flows & effluent limits:
Membrane Bioreactor (MBR) Sequencing Batch Reactor Relocate Plant
• Detailed evaluation of economic and non-economic factors of each option *MBR selected for cost effectiveness, small footprint,
effluent quality
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