PROJECT HIGHLIGHTS
One of four Enviroquip MBRs the Tribe bought.
DESCRIPTION
The Confederated Tribes of the Grand Ronde took a decentralized approach to their wastewater treatment needs. The Tribe has three operating Enviroquip MBR Systems spread across the reservation ranging in size from 33,000 gpd to 300,000 gpd. The Spirit Mountain Casino WWTP was a 100% retrofit of an existing SBR system. The design build team was able to complete the retrofit in 4.5 months with zero change orders without disrupting play at Oregon's number one tourist attraction, The Spirit Mountain Casino. For more information on the other operating MBR Systems on the reservation, please see case studies for Grand Ronde Elder Housing WWTP and Grand Ronde Family Housing 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 ® MBR |
|---|---|
| Previous Facility Type | SBR |
| Owner | Confederated Tribes of the Grand Ronde |
| Engineer | Dyer Partnership |
| Contractor | Triad Mechanical, Inc. |
| Operations | Spirit Mountain Casino |
| Delivery Method | DB |
| Time To Retrofit | 4.5 months |
| Total Installed Project Cost | $2,600,000 |
PLANT DESIGN INFORMATION
| Fine Screen Type | Static |
|---|---|
| Aperture or Slot Size | 1 mm |
| Supplemental Aeration Technology | Fine Bubble, Disks |
| MBR Blower Type | Positive Displacement |
| Solids Management Data | Aerobic Digestion, Belt Press |
| SCADA System | Wonderware |
| Disinfection Method | UV |
| # Process Stages | 3 |
MBR (MEMBRANE ZONE) DESIGN
| Filtration Mode | Gravity |
|---|---|
| # of Reactors : | 2 |
| Submerged Membrane Unit (SMU) | ES200, KUBOTA® |
| # SMU | 14 |
| Design Flux (MMF) | 12.46 gfd |
| Minimum Temperature | 10°C |
| Peak Factor | 2.0 |
| # of Maintenance Cleans | 3 |
