Water Treatment Systems

Process plants often require water in different quantities and qualities—using potable (drinkable) water for everything is typically far too expensive.

We have experience in producing potable water using the standard "filtration; coagulation; chlorination" approach, as well as experience in the use of membrane filtration.

We also have experience in problem-solving when others have gone wrong! We once watched as a boiler filled itself by foaming its water—milk-volatiles had found their way into the boiler's water supply, producing what might well have been the world's largest cappuccino milk-frother!

To get your project right the first time, you can depend on PWCL. We will ensure your project goes to plan: on time and on budget.

Previous Experience

The following is a list of our previous experience that is directly related to water treatment systems. All figures are in New Zealand dollars unless otherwise stated.

• Water Processing, NZ ($7.5m)

  Project Management and Engineering for specialist water processing plants requiring water to a quality level equal to or exceeding "Best Practice" drinking water for an international beverage company treating high hardness, high alkalinity bore water to a quality being used to provide bottled water, up to 45,000 litres per hour.

• Water Treatment Plant - Coca-Cola Amatil, PNG ($2.6m)

  Turn-key design, construction, supervision, site installation and commissioning of a fully automated 1.1ML/day water treatment system. Complete detailed design from bore to filling machines including pre-filtration, nano-filtration (installation automation and commissioning), chlorination, dechlorination and water distribution. NF design and supply by others.

• Boiler Installation, Associated Steam Pipework and Waste Water System Modifications - Kiwi Dairies Ltd, NZ ($3.2m)

  Engineering design and site supervision of the installation of a new 8MW boiler and associated piping. Site supervision of major modifications to the site waste water treatment system. Management of upgrades to the plant HVAC and sewerage systems.

• Process Water Plant - CHH Ltd, Whakatane, NZ ($350,000)

  Evaluation of various solutions, design and installation of selected equipment, modernisation of chemical dosing regimes, dosing equipment and performance monitoring equipment.

• Labasa Potable Water Plant - Sophora Water Ltd, Fiji ($3.0m)

  Project management and site supervision of 10Ml/day potable water supply to Labasa township. Overall plant design by others.

• Note: PWCL has project managed some $500m of work on the Kiwi Dairies Ltd Whareroa site, taking its milk processing capacity from about 6 million litres per day to in excess of 12 million litres per day. It is one of the largest milk-processing sites in the world.

• Cogeneration Plant - Kiwi/Todd Joint Venture, NZ ($70m)

  Project management for the co-generation plant consisting of four gas turbines (10MW each), four supplementary fired waste heat recovery boilers with a total steam capacity of 180 tph, a 28 MW steam turbine, 11/110 kV transformers and switchyard and 110 kV export line for connection to the national grid.

  The project also included associated buildings, cooling towers and water treatment plant, plus the necessary resource consents etc. Also responsible for designing the steam attemperation system for the supply of conditioned steam to the associated dairy factories, as well as all piping systems, plus managing construction and commissioning of all the plant.

  The primary purpose of the Cogeneration plant is to provide steam and electricity to the dairy factories, with the secondary purpose being to export electricity. This leads to the need for some novel control algorithms to ensure continuous steam and electrical supply while optimising the power generated for export.

• Site Services Upgrade - Kiwi Dairies, NZ ($30m)

  Project management, design and site supervision of major revisions to the site Hot Water, Domestic Cold Water, Cooling Water, Chilled Water and Compressed Air systems including:

  • 14MW of additional hot water heating
  • 10ML/Day of additional treated domestic cold water plant
  • 56MW of additional cooling water capacity
  • 10MW of additional chilled water capacity
  • 1200lpm of additional dried compressed air
  • All major reticulation changes associated with these services.
• Milk Evaporator Condensate Treatment Plant - Kiwi Dairies, NZ ($3m)

  Project management, design and site supervision of the installation of a water treatment facility capable of handling up to 7Ml/day of evaporator condensate. Product water is sterile and has greatly reduced taste and greatly reduced smell compared with raw condensate. This allows the high quality water to be used for high grade product washing and dilution.