Rotoma / Rotoiti WWTP & Land Disposal System – Concept Design

Client:  Rotorua Lakes Council
Date:  2014 – 2020

We investigated options for a sewerage scheme for the lakeside communities of Rotoiti and Rotoma and subsequently developed a concept design for a wastewater treatment plant (WWTP) and a land discharge system utilising a chemically assisted membrane bioreactor (MBR) technology and disposal to a rapid infiltration trench system.

We have subsequently undertaken the detailed design of the wastewater collection and conveyance system which has utilised a septic tank effluent pump system and a series of transfer pump stations and rising mains.  We have also undertaken the detailed design of a UV disinfection system to allow for offsite beneficial reuse of the treated effluent from the MBR based WWTP.  A feature of the project has been the development of the options, design and construction requirements to align closely with local iwi values.

Key Aspects:

• Options assessment
• Concept development
• Stage 2 hydrogeological Investigation
• Technical consent assistance
• Detailed design of reticulation
• UV disinfection