Paeroa Wastewater Treatment Plant Inlet Screen and Grit Removal System Upgrade

Hauraki District Council (HDC) wishes to upgrade the existing Paeroa wastewater treatment plant (WwTP) to cater for predicted population growth in the region over the next 30 years. The biological plant upgrades will be implemented in stages over the next few years. However, the existing inlet screen has reached the end of its useful life and requires replacement prior to the implementation of the major upgrade.

The new inlet works must be capable of meeting the current demands for the existing treatment process, while also treating influent to the required standard for future integration with the upgraded plant. This request for proposal is for the design and supply of in-tank inlet screens and grit and fat, oil and grease (FOG) removal system.

HDC are looking for two options: Option 1: Two treatment trains of screen, and grit and FOG removal with a capacity of 213 L/s (duty / duty configuration), plus an emergency bypass screen of full capacity (426 L/s). Option 2: Two treatment trains of screen, and grit and FOG removal with a capacity of 426 L/s (duty / standby configuration), plus an emergency bypass screen of full capacity (426 L/s).

The overall inlet upgrade works includes other works such as re-routing an existing rising main, a stone trap channel, and the inlet works overflow channels into the existing ponds. These civil works are carried out by the Installation Contractor (third party). The Supplier (this contract) will work with the Installation Contractor to deliver the complete inlet works upgrade.