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Carnation Wastewater Treatment Plant

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

&#36;900,000

Project cost

&#36;23m

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

Client

King County Wastewater Treatment Division

Design engineers

Carollo

Design architects

Michael Willis

Membrane systems

GE Water &#38; Process Technologies

Conservation and demand analysis team

Aquacraft, Pacific Institute and Carollo

Wetland partner

Ducks Unlimited
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