Carnation Wastewater Treatment Plant, Membrane Bioreactor (MBR), King County, WA, USA
Key Data:
Plant type
Municipal tertiary treatment WWTP
Initial capacity
1,500m³/day
Design capacity
1,800m³/day
Site area
10 acres
Treatment type
Membrane bioreactor
Indicative ZeeWeed MBR effluent
BOD
<5mg/L
TSS
<2mg/L
NH3-N
<1mg/L
TN
<5mg/L
TP
<0.1mg/L
Turbidity
<0.5NTU
Faecal Coliform
<10CFU/100mL
SDI
<2
Mixed liquor solids concentration
8,000mg/L – 10,000mg/L
Product
Class A reclaimed water
Membrane system cost
$900,000
Project cost
$23m
Project Timeline:
Sewage agreement signed
July 2002
Public consultation began
January 2003
Water quality/plant site studies
Throughout 2003
Water conservation and demand analysis
2004-2005
Consultation period closed
July 2004
Final EIS issued
October 2004
Site selection
December 2004
Engineering design completed
December 2005
Groundbreaking ceremony
6th July 2006
Construction began
Spring 2006
Side sewer construction began
Spring 2007
Wetland construction began
Summer 2007
Main sewer system completed
February 2008
First day of operation
5th May 2008
Dedication ceremony
2nd June
WateReuse Association's Small Project of the Year Award
September 2008
Key Players:
Client
King County Wastewater Treatment Division
Design engineers
Carollo
Design architects
Michael Willis
Membrane systems
Zenon
Conservation and demand analysis team
Aquacraft, Pacific Institute and Carollo
Wetland partner
Ducks Unlimited
