Peirce Island Wastewater Facility Upgrade Project

This project is the largest that the City has undertaken. The Peirce Island Wastewater Treatment Facility (WWTF) upgrade expands treatment at the plant to an advanced secondary process which removes organics and nitrogen. Progress videos are available on our YouTube page, shown below.

Project Contact

Terry Desmarais

P.E, City Engineer

(603) 766-1421

tldesmarais@cityofportsmouth.com

DEDICATION PLANNED FOR JULY 13, 2021

For information about the dedication event, click here.

PROJECT FACTSHEET

Start Date: September 2016
BAF Substantial Completion: December 2019
Secondary Permit Compliance: April 2020
Project Substantial Completion: July 2021
Final Completion: 2021 (under review)
Project Construction Costs:
- Base Contract: $72,785,545.00
- Change Order No. 1: $367,290.42
- Change Order No. 2: $546,722.46
- Change Order No. 3: $ 93,838.31
- Change Order No. 4: $162,869.20
- Change Order No. 5: $249,828.16
- Change Order No. 6: $292,031.11
- Change Order No. 7: $169,138.30
- Change Order No. 8: $112,659.75
- Change Order No. 9: $242,419.68
- Change Order No.10:$122,783.46
- Change Order No.11:$138,938.61
- Total Contract: $75,284,064.46
Design Engineer: AECOM
General Contractor: Methuen Construction
Design Flow: 6.1 MGD average
New Treatment Processes:
- New Headworks
- Biologically aerated/anoxic filter (BAF) using the Kruger BioSTYR ™ technology for Secondary Treatment and Nitrogen Removal
- Rotary screw presses for solids dewatering
- Simplified Process Flow Schematic