Kwinana industrial area case study

The Kwinana Water Recycling Plant (KWRP) is our largest industrial water recycling plant. The plant treats secondary treated wastewater from the Woodman Point Wastewater Treatment Plant.

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

By 2004, we had the KWRP up and running. The plant provides wastewater treated to ‘fit-for-purpose’ standards for industrial customers. It is owned and operated by Water Corporation and its Alliance partners.

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.

The recycled water is provided to Kwinana industrial customers through a dedicated pipe network. 

Industry participants include BP, Perth Power Partnership, CSBP and Tronox. These customers pay a volumetric price for recycled water. In 2012–13, recycled water supplied by the KWRP reduced drinking water use in the KIA by by 4.6 billion litres. That’s the equivalent of to 2,044 Olympic sized swimming pools of drinking water saved!

In 2005, the KWRP won an AWA Environment Award for its environmental benefits.

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.

What we are doing now

KWRP can be expanded by a further 10 million litres per day, or 3.6 billion litres per year, should demand arise. This would deliver maximum capacity for the plant on its existing site. Environmental approvals are already in place for this expansion.

You may also be interested in