PROJECT HIGHLIGHTS
Commissioned November, 2009
Domestic WW, Greenfield
Permit(s); Discharge
6/NA/0.2 (TN/TP/Turbidity)
State Park ⇒ River
MMF Capacity: 0.03 MGD
$87.2/gal
0.25 FTE (Full‐Time Employees)
Pollutants entering the Puget Sound and Hood Canal from these two parks have been reduced by more than 95%.
DESCRIPTION
The Larrabee plant has been in operation since November 2009. Some concerns during design were high flows over holiday weekends and plant operation during the off‐season, when flows at the plant can vary by 90%. The flexibility integrated into the design has allowed the operator to come up with strategies to maintain effluent quality during periods of low flow, which was an initial challenge for plant operations. One of the strategies it uses is remotely turning equipment on or off to provide nutrients for the biology of the plant when it receives very little flow during the winter. The Ovivo MBR System was selected based on lowest capital cost, lowest operation and maintenance costs, and lowest cost of ownership.
LOCATION
Bellingham, WA
IMAGES
PROJECT OVERVIEW
| System Type(s) | Enviroquip ® MPAC® |
|---|---|
| Previous Facility Type | Lagoon |
| Owner | Washington State Parks & Recreation |
| Engineer | Hammond, Collier, Wade, Livingstone |
| Contractor | BOSS Construction |
| Operations | West Sound Utility District |
| Delivery Method | Pre-Selection, Pre-Purchase |
| Time To Retrofit | 9 months |
| Total Installed Project Cost | $2,180,000 |
PLANT DESIGN INFORMATION
| Fine Screen Type | Bar Screen |
|---|---|
| Aperture or Slot Size | 2 mm |
| Supplemental Aeration Technology | Fine Bubble, Tubes |
| MBR Blower Type | Regenerative |
| Solids Management Data | Hauling |
| SCADA System | Wonderware |
| Disinfection Method | UV |
| # Process Stages | 4 |
MBR (MEMBRANE ZONE) DESIGN
| Filtration Mode | Pumped |
|---|---|
| # of Reactors : | 1 |
| Submerged Membrane Unit (SMU) | Es125, KUBOTA® |
| # SMU | 2 |
| Design Flux (MMF) | 12.3 gfd |
| Minimum Temperature | 10°C |
| Peak Factor | 2.0 |
| # of Maintenance Cleans | 2 |
