PROJECT HIGHLIGHTS
Commissioned October, 2005
Domestic WW, Greenfield
Permit(s); Not Required
10/5/0.5 (TN/TP/Turbidity)
Office Building ⇒ Drainfield
MMF Capacity: 0.012 MGD
$30.0/gal
0.25 FTE (Full‐Time Employees)
One of two Enviroquip MBR Systems the Tribe owns.
DESCRIPTION
The Confederated Tribes of the Chehalis Reservation located in Oakville, WA developed a Master Plan for their reservation that included seven (7) decentralized MBR Systems for wastewater treatment ranging in size from 6,000 gpd to 112,000 gpd. The first of which was installed to treat wastewater from their new Public Safety Building. Flow is fed from a 3,500 gallon septic tank into a single train MBR. Although it is not shown in the enclosed photos, the equipment skid is located inside a modular fiberglass enclosure. Discharge from the facility is sent to a nearby drainfield. For more information on the second MBR plant on this reservation,
LOCATION
Oakville, WA
IMAGES
PROJECT OVERVIEW
| System Type(s) | Enviroquip ® MPAC® |
|---|---|
| Previous Facility Type | None |
| Owner | Confederated Tribes of the Chehalis Reservation |
| Engineer | Brown & Caldwell, Ayres & Associates |
| Contractor | Ayres & Associates |
| Operations | Confederated Tribe of the Chehalis Reservation |
| Delivery Method | Pre-Select, Pre-Purchase |
| Time To Retrofit | 10 months |
| Total Installed Project Cost | $360,000 |
PLANT DESIGN INFORMATION
| Fine Screen Type | Bar Screen |
|---|---|
| Aperture or Slot Size | 2 mm |
| Supplemental Aeration Technology | Medium Bubble, TransMax |
| MBR Blower Type | Regenerative |
| Solids Management Data | Hauling |
| SCADA System | RSView SE/ME |
| Disinfection Method | Chlorine |
| # Process Stages | 3 |
MBR (MEMBRANE ZONE) DESIGN
| Filtration Mode | Pumped |
|---|---|
| # of Reactors : | 1 |
| Submerged Membrane Unit (SMU) | Es75, KUBOTA® |
| # SMU | 2 |
| Design Flux (MMF) | 9.5 gfd |
| Minimum Temperature | 10°C |
| Peak Factor | 2.0 |
| # of Maintenance Cleans | 2 |
