The Bacchus Marsh Gasworks, VIC


Enviropacific has been involved in a SEAR (Surfactant Enhanced Aquifer Remediation) project at the site of the old Bacchus Marsh Gasworks, about 50 kilometres north west of Melbourne. The scope includes treating both the contaminated groundwater and toxic vapour. Ultimately, the area will become a Public Parks and Recreation Planning Zone [PPRZ]


Enviropacific has set up a mobile treatment plant and is now working to clean up the site. The remediation system connects a series of wells containing contaminated water and vapour. Initially the process separates the extracted mixture into a liquid and gas stream, and each stream is treated independently.


The liquid is directed to the pre-treatments system. First, heavy contaminants are captured and removed when they settle into a thick sludge (as a result of water processing and conditioning). The sludge is collected and transported off-site for disposal at an approved licensed facility. Suspended solids are then removed in the next treatment stage and sent off-site for disposal. The remaining contaminated water is treated in Enviropacific’s Mobile Water Treatment System (MWTS) to remove any residual hydrocarbons using a series of filtration beds. These hydrocarbons are also collected and sent to a licensed disposal facility.

Water from the WTS, is then used within the chemical injection system (CIS) – minimising water usage for the project. The CIS is where the heart of the SEAR process is located. Water is mixed with a surfactant which is injected into the well network to help in the removal of more contaminants, ensuring maximum and safe reuse.


The gas is processed in the vapour extraction system, in line with the project’s strict compliance and environmental conditions, prior to being released.

This project is due for completion in 2019 ultimately ensuring that residents of Bacchus Marsh can enjoy a safer and healthier environment in which to live, work and play.