PROJECT HIGHLIGHTS
• Commissioned September,
2012
• Domestic WW, Greenfield
• Permit(s); Not Required
10/NA/2 (TN/TP/Turbidity)
Housing Development ⇒ Subsurface
MMF Capacity: 0.03 MGD
$50.0/gal
0.25 FTE (Full‐Time Employees)
One of four Enviroquip MBRs the Tribe bought.
DESCRIPTION
The Confederated Tribes of the Grand Ronde in Oregon took a decentralized approach to their wastewater treatment needs. The Tribe has three operating Enviroquip MBR Systems across the reservation ranging in size from 33,000 gpd to 300,000 gpd. The Elder Housing WWTP is an above ground 33,000 gpd package MBR System. Although it was the first system installed on the reservation, it was the last one to startup due to lack of sufficient flow. For more information on the other operating MBR Systems on the reservation, please see case studies for Grand Ronde Family Housing WWTP and Spirit Mountain Casino WWTP. The Tribe sold the portable MBR unit once used for temporary treatment for the Family Housing plant.
LOCATION
Grand Ronde, OR
IMAGES
PROJECT OVERVIEW
| System Type(s) | Enviroquip ® MPAC® |
|---|---|
| Previous Facility Type | None |
| Owner | Confederated Tribes of the Grand Ronde |
| Engineer | Harper Houf Peterson Righelis |
| Contractor | Cascade Water Systems |
| Operations | Confederated Tribe of the Grand Ronde |
| Delivery Method | Negotiation, Pre-Purchase |
| Time To Retrofit | 12 months |
| Total Installed Project Cost | $1,700,000 |
PLANT DESIGN INFORMATION
| Fine Screen Type | Bar Screen |
|---|---|
| Aperture or Slot Size | 2 mm |
| Supplemental Aeration Technology | Fine Bubble, Disks |
| MBR Blower Type | Regenerative |
| Solids Management Data | Hauling |
| SCADA System | RSView32 |
| Disinfection Method | Chlorine |
| # Process Stages | 3 |
MBR (MEMBRANE ZONE) DESIGN
| Filtration Mode | Pumped |
|---|---|
| # of Reactors : | 2 |
| Submerged Membrane Unit (SMU) | ES50, KUBOTA® |
| # SMU | 6 |
| Design Flux (MMF) | 13.3 gfd |
| Minimum Temperature | 12°C |
| Peak Factor | 2.0 |
| # of Maintenance Cleans | 2 |
