We maintain the highest safety standards while focusing on quality workmanship and timely delivery.

Glenelg wastewater treatment plant sedimentation tank refurbishment

The sedimentation tanks and mechanical equipment at the Glenelg WWTP were severely deteriorated, and the objective of this project was to rehabilitate them to ensure ongoing serviceability and reliability. The work involved condition assessments, 400m2 of concrete remediation, 2500m2 of concrete protective coating and replacement of sludge scraper chain systems. The quantity of concrete repair required almost doubled during the project and new concrete repair products and methods allowed the work to be completed on schedule with a higher quality finish. The client also congratulated GO on the excellent collaboration with other contractors on site.

“The installation in Tank 4&5 was amongst the best I have ever seen in 25+ years of involvement with the Polychem product.” 
Nigel Ayres  supplier of the scraper system

Denmark wastewater treatment plant upgrade

This was a detailed design and construct contract for a 1.20ML/day upgrade of Water Corporations Denmark WWTP in southern WA. Work consisted of new inlet works, incorporating fine screens and grit removal, 1.2MLD oxidation ditch with surface aerators and submersible mixer, a tanker receival pump station, odour collection and treatment facilities, chemical dosing facilities for Alum, Magnesium Hydroxide, Polymer and Hypochlorite and an operations building to accommodate electrical, control and SCADA systems. The construction program was challenged by high rainfall, design changes to the oxidation ditch and an unidentified HV cable running through the site. Despite this the project was completed on schedule and is consistently producing water to specification.

Christies Beach sludge dewatering plant, odour control plant & HV power supply

The Christies Beach WWTP Upgrade Project involved GO delivering one of the critical packages; a new HV power supply for the site as well as dewatering and odour control facilities. Work also included screening of primary sludge using a rotary strain press, sludge transfer, storage and loading conveyor systems, Polymer Dosing Systems and odour control plant including Chemical Scrubber and Activated Carbon Scrubbers. Close communication with both the client and plant operators allowed this project to be completed safely under an accelerated construction schedule.

Rottnest Island wastewater treatment plant upgrade

This project for the Rottnest Island Authority required the conversion of an existing aerobic digester into a Membrane Bioreactor (MBR) plant. GO's contract was for the design and construction of earthworks, process building including a control room, biological reactor and aeration systems, ultra-filtration membrane filters, chemical dosing and UV disinfection systems, pumping systems, electrical and control systems. The site is on an island off the coast of Perth, so construction required meticulous planning for the transport of equipment and the management of construction resources. The client subsequently awarded GO contracts for other work on the island unrelated to the treatment plant.

Gordon Rd WWTP & Halls Head WWTP Inlet Works

This project involved the design and construction of new inlet works at two of Water Corporations wastewater treatment plants near Mandurah, WA. Both sites included new inlet screening channels in a duty/standby arrangement containing Centre-flow band screens. Miniwashers were installed below the band screens, connected by discharge chutes to clean and dewater captured screenings. A Spirotainer of 10 m3 capacity was provided for screenings storage. The Halls Head site didn’t have a facility for grit removal, so a cross-flow type grit tank was constructed downstream of the new screening channels. The two contracts were undertaken concurrently and completed ahead of schedule.

“The project has been linked in and commissioning is taking place. Well done to GO and Project Team. Safe, under budget and ahead of schedule!”
George Golowyn Principal Project Manager, Water Corporation