Kwinana industrial area case study

Our Kwinana Water Recycling Plant has reduced annual drinking water use in the Kwinana Industrial Area by 5 billion litres.

Why we acted

Kwinana industrial area 

The Kwinana Industrial Area (KIA) is located 30 km south of Perth and is home to a number of heavy industries that are substantial water users. The KIA is WA's primary area of industrial development, consisting of a highly diverse range of industries.

Smaller service industries: 

  • fabrication 
  • construction facilities.

Very large heavy process industries:

  • alumina 
  • nickel 
  • oil refineries.

Kwinana Water Recycling Plant 

Historically, industries in the KIA obtained water from groundwater sources. By the late 1990s, these resources were fully allocated, meaning additional supplies were required to underpin industrial expansion in the area. 

In 1998, we investigated demand for industrial water at varying levels of quality. A range of supply options were identified and analysed, with recycling wastewater emerging as the preferred option. 

The environmental conditions placed upon the establishment of a new pig iron plant in the area provided sufficient security of demand to enable investment in the Kwinana Water Recycling Plant (KWRP).

How we did it

Since it commenced operation in 2004, the plant has reduced annual drinking water use in the Kwinana Industrial Area by 5 billion litres. That’s the equivalent of almost 120,000 backyard swimming pools.

It is owned and operated by Water Corporation and our Alliance partners. It is our largest industrial water recycling plant, providing fit-for-purpose recycled water from the Woodman Point Wastewater Treatment Plant to our industrial customers, such as  BP, Perth Power Partnership, CSBP and Tronox, through a dedicated pipe network.

The site was chosen due to its strategic location for 2 reasons: 

  • being close to both the Sepia Depression Ocean Outlet Landline (SDOOL), which is an ocean outfall that supplies the raw feedwater to the plant 
  • proximity to the Kwinana industries that represent the current and future customer base

As part of the project, industry is also diverting their effluent discharge from Cockburn Sound to the better flushed marine environment of the Sepia Depression, 4km offshore in 20m metre deep ocean water.

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