New Zealand Projects


Some of our projects are showcased on our web site including New Zealand and international examples. For other examples just contact us at any time to talk through your project needs.




We have a proud history working with local authorities and commercial sites within New Zealand.


Tauranga City Council

Project Update: Te Maunga Waste Water Treatment Plant, Mt Maunganui

In 2016 Reaman Industries were contracted by the Tauranga City Council to replace the diffusers in the reactors of their existing waste water treatment plan in Mt Maunganui.


Photo 1

Shows the amount of sludge that had to be removed prior to lifting out of each aeration lateral.  Once the sludge was removed and the air supply down-comer was disconnected the lateral was lifted out for cleaning and removal of the existing diffusers.

Photo 1 Te Maunga Update


Photo 2

After the removal of the diffusers the lateral was cleaned and repaired on completion of that phase the new diffusers were fitted to the lateral, checked and awaited replacement back in the reactor.

Photo 2 Te Maunga Update


Photo 3

Upon completion of all of the sludge from the bottom of the reactor, the completed laterals were reinstalled and installation completed – the photo shows installation prior to filling and testing.

Photo 2 Te Maunga Update



Project Description: Te Maunga WWTP Upgrade 2005, Mt Maunganui

The Te Maunga Waste Water Treatment Plant (WWTP) provides wastewater treatment for the domestic, commercial and industrial communities from the Mount Maunganui and Papamoa catchments. The WWTP is located south of Tauranga and was commissioned during 1996. The first upgrade took place in the year 2000, which entailed modifications to the aeration control and distribution system and the installation of additional diffusers. The plant was designed as an extended aeration activated sludge system, utilising an oxidation ditch configuration.


The modifications to the bioreactor and the provision of additional aeration capacities resulted in doubling the organic and hydraulic capacity of the existing plant (from 8,000 m3/d to 16,000 m3/d) and controlling nitrogen removal more effectively.


The design of the aeration system was critical to ensure that minimal disruptions and downtime occurred during the removal of the existing ceramic diffusers and the installation of new banks of diffusers. Divers were used to install brackets on the tank floor. Tube type silicon membrane diffusers were installed in all the aeration zones. The banks of diffusers are removable and can be lifted out of the tanks using a 50-tonne crane.


The removal of the existing diffusers, the installation of the new banks of diffusers and the connection and extension of the existing pipe header had to be carried out progressively, to ensure continued treatment of the incoming wastewater.


This project was completed on time and under budget including:

  • 20% overall site power saving, which equates to at least 30% power saving on the aeration system as reflected in lower airflow requirements
  • Lower utilisation of blowers which means longer life expectancy
  • Doubling the treatment capacity from 32,000 EP to 64,000 EP

Te Maunga WWTP Stage 2 upgrade


Carterton District Council

Project Description: Kaipatangata Water Supply

Reaman Industries designed, supplied and installed a 200m3/hour Multi Layer Filtration/Bag Filter System, including pipework and valves, programmable logic controller and motor control centre including testing and commissioning the system.


This was the first of its type in New Zealand and was designed by Water & Waste Treatment NZ Limited in a joint venture with Reaman Industries to provide not only water of a quality to exceed the drinking water standard of New Zealand, but to ensure the removal of water born protozoa including giardia lamblia and cryptosporidium cysts.


It is considered by leading world authorities on water treatment, that the removal of giardia from drinking water only requires the removal of particles greater than 5 micron and for the removal of cryptosporidium particles 2 micron and greater. However, this system includes a 2-stage filtration process to ensure the removal of 99.9% of all particles 1 micron in size and larger (the naked eye detects particles greater than 80 microns).


As a result of the filtration process, the water leaving the plant will not only be free of parasites but will be close to bottle water quality. The computer-driven plant is close to being fully automatic and requires little operation attention. The free chlorine residual and the pH is automatically maintained and the turbidity of the water is measured both on entry to the plant and after treatment. Flow is continuously measured and totalised.


This system utilises Bruner multi-layered filters with a 10 micron particle retention followed by bag filters with 1 micron absolute retention to ensure the removal of all water born protozoan cysts including giardia and cryptosporidium. Disinfection and pH is fully automated with the latest chlorination and monitoring equipment from Capital Control Co Inc of USA and the plant operation is controlled by Allen Bradley PLC.


Te Aute College, Central Hawke’s Bay

Project Description: Water Treatment Plant

Reaman Industries supplied a 20m3/hr water treatment plant to produce potable water to the School’s spring water supply. The water is filtered to 5 micron and softened through industrial water softeners at the end of this process. The treated water passes through taste and odour treatment processes prior to entering the school’s reticulation system.


Village of Luggate, near Wanaka

Project Description: Rotating Biological Contactors Waste Water Treatment Plant

In 2003 Reaman Industries supplied and installed a 110m3 waste water treatment plant in the Village of Luggate which is adjacent to the township of Wanaka.  This project was completed to time and budget.


After discussions with the consulting engineer MWH, an S&P subsurface RBC complete with primary treatment tanks, filtration and disinfection processes were supplied and installed.  The treated effluent is discharged to deep bed disposal trenches which are rotated on a regular basis.