The Effect of TMDL on Wastewater Management

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The Effect of TMDL on Wastewater Management

• Issa Hamud, P.E
• City of Logan

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Presentation Outline

• Introduction
• Description of Facilities
• Historical Performance
• Future Facility Requirements
• TMDL Goals for Cutler Reservoir
• Mechanical Plant for Phosphorus Removal

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Description of Facilities

• Description of Facilities
• Lagoons
• Head works
• 7 lagoon cells
• Aeration system
• chlorination
• Conveyance ditch
• Wetlands
• Inlet pond
• Screw pumps
• 6 wetland cells
• 2 storage cells
• Discharge point

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Logan Wastewater Service Area Population
Projection
128,000
Thousands
Year
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Logan Wastewater Service Area Flow Projection
28 MGD
MGD
Year
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Logan Used Facultative Lagoons Until the Mid
1980s
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City of Logan Lagoons
Headworks
A2
A1
B2
B1
C
Chlorine Contact Basin
D
E
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Logan Treatment Wetlands and Storage Ponds July
2004
N
Storage Ponds
150 MG
250 MG
002
5
1
4
3
2
Inlet Pond
Screw Pumps
From Lagoons
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Currently, Aerated Lagoons are Used to Treat the
Citys Wastewater
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Discharge was Moved to Cutler Reservoir Because
of Increased Water Quality Standards on the
Little Bear River
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Wetlands Added to Remove Ammonia
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Cutler Reservoir Beneficial Use Assessment

• 2B Secondary Contact Recreation Fully
  Supported
• 3B Warm Water Game Fishery Partially Supported
• 3D Water Fowl Habitat - Fully Supported
• 4 Agricultural Use - Fully Supported

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Historical Performance

• Historical Performance
• Lagoons
• BOD
• TSS
• Ammonia
• Total Phosphorous
• Wetlands
• BOD
• TSS
• Ammonia
• Total Phosphorous

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Cutler Reservoir
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Proposed Phosphorus Limits

• A target of 0.070 mg/L TP would be set for each
  segment (13) of the Northern Reservoir, and a
  target of 0.18 mg/L TP would be set for each
  segment (4 and 5) of the Southern Reservoir.

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Required Reduction Level

• a 20 reduction of loads from tributaries and
  point sources that are not currently covered
  under another TMDL and have total phosphorus
  concentrations in excess of 0.05 mg/L. These
  include non-point sources along Swift Slough,
  Blue Springs Ditch, the Logan WWTP, the Utah
  portion of the Bear River, and Clay Slough. A 20
  reduction of internal load would also be required
  to meet the endpoints in the Southern Reservoir.
• Logan WWTP would be required to meet the Southern
  Reservoir endpoint.

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Next Step

• Sequential Batch Reactor SBR Plant
• Annual AVE Daily Flow 28 mgd
• Peak Month AVE Daily Flow 48 mgd
• Capital Cost 188 million
• Annual OM Cost 3 million
• Seek New Technologies
• Enhanced Biological Phosphorus Removal (EBPR)
• Algae System

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Enhanced Biological Phosphorus Removal (EBPR)
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Algae System