PROJECT HIGHLIGHTS
CommissionedFebruary,2011
DomesticWW,NewConstruction
Permit(s);Discharge
NA/NA/NA(TN/TP/Turbidity)
POTW Ocean
MMFCapacity:4.1MGD
$17.66/gal
6FTE(Full‐TimeEmployees
The support and follow-through we received from Ovivo far surpasses any that we have received to date from others while starting up our liquid stream.
DESCRIPTION
The original Picnic Point Wastewater Treatment Facility (WWTF) was constructed in 1973 to provide wastewater (sewage) treatment for the Alderwood Water and Wastewater District (District). The facility provides treatment and disinfection of sewage before discharging it into the Sound. Based on the results of an extensive evaluation, including a net present worth (NPW) analysis, an Enviroquip® MBR System was selected to renovate the old plant. Some of the evaluation criteria used to compare technologies and suppliers included noise, odor, economics, maintenance, operations, solids handling, visual appearance, permitting, truck traffic, and construction impact.
LOCATION
Alderwood, WA
IMAGES
PROJECT OVERVIEW
| System Type(s) | Ovivo® MBR |
|---|---|
| Previous Facility Type | CAS |
| Owner | Alderwood Water and Wastewater District |
| Engineer | URS Corp, Brown & Caldwell, CH2M Hill, Tetra Tech |
| Contractor | Apollo Inc. |
| Operations | District |
| Delivery Method | DBB, Pre-Selection |
| Time To Retrofit | 36 months |
| Total Installed Project Cost | $72,422,229 |
PLANT DESIGN INFORMATION
| Fine Screen Type | Band Screen |
|---|---|
| Aperture or Slot Size | 3 |
| Supplemental Aeration Technology | Fine Bubble, Strips |
| MBR Blower Type | Turbo |
| Solids Management Data | Centrifuge, Class A |
| SCADA System | iFix |
| Disinfection Method | UV |
| # Process Stages | 5 |
MBR (MEMBRANE ZONE) DESIGN
| Filtration Mode | Pumped |
|---|---|
| # of Reactors : | 4 |
| Submerged Membrane Unit (SMU) | RW400 |
| # SMU | 56 |
| Design Flux (MMF) | 11.7 gfd |
| Minimum Temperature | 13.5°C |
| Peak Factor | 2.38 |
| # of Maintenance Cleans | 3-12 |
