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Rosedale Wastewater Treatment Plant (WWTP) Upgrade

Volume of Wastewater Treated

19.7m m³/y

Activated Sludge Tank Capacity

7,000m³ each

Secondary Clarifiers

Four x 48m diameter

Secondary Treatment BOD Removal

75% to 80%

Secondary Effluent BOD Load

0.5t/d

Polishing Lakes Detention Period

Up to 35 days

New Faecal Coliform Standard

1,000cfu per 100ml (median value)

Final UV Treatment System (after expansion)

Six-channel system (1,296 lamps)

UV Treatment Full Peak Flow

3m³/s to 4m³/s

UV Treatment System Cost

NZ$2.26m

Total Estimated Cost (Stage 4)

NZ$31m

Estimated Cost of the New Outfall

NZ$60m

Stage 5 Cost

$17m

Rosedale Tunnel and Outfall Cost

$116m

Resource Consent Approval

April 2001

Stage 4 Upgrade Completion

2004

New Faecal Coliform Standard Effective from

1 January 2004

Foreshore Sewer Upgrade Phase I Completed

November 2003

Foreshore Sewer Upgrade Phase II Commenced

May 2004

Deadline for Reuse / Composting of Biosolids

2007

New Sea Outfall Completion Required by

1 July 2008

Stage 5 Completion

May 2008

Rosedale Tunnel and Outfall Completion

August 2010

Project Sponsor / Finance

North Shore City Council

Regulatory Body

Auckland Regional Council

Consulting Engineers

Sinclair Knight Merz

Environmental Planning Consultants

Simpson Grierson

Nutrient Removal System Design

URS

UV System

Wedeco

Maintenance Contractor

Techscape
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