---
title: Paihia Wastewater Treatment Plant
description: Marshall Projects has been contracted to deliver an upgrade to the Paihia Wastewater Treatment Plant using Bio-Shell™ bioreactors technology.
image: https://www.gyroplastics.com/hubfs/Images/pillar-installation-featured.jpg
---

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# Paihia Wastewater Treatment Plant

![](https://www.gyroplastics.com/hubfs/Images/pillar-installation-featured.jpg)

- September 18, 2023

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[GYRO Team](https://www.gyroplastics.com/article/author/gyro-team)

Marshall Projects has been contracted to deliver an upgrade to the Paihia Wastewater Treatment Plant using Bio-Shell™ bioreactors technology. The project is designed to remove up to 120 kg/day of ammonia using 552 Bio-Shell™ bioreactors units installed into an existing oxidation pond at the Paihia site. The Bio-Shells™ bioreactors are being fabricated locally and the oxidation pond will remain in service during Bio-Shell™ bioreactors installation.

When completed, the Paihia WWTP will be the largest Bio-Shell™ bioreactors installation in the world.

The project is due for completion in May 2020.

Contract value $5.5 Million

 

[Marshall Projects Web Site](https://marshallprojects.co.nz/projects/)

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