• About
  • Advertise
  • Subscribe
  • Contact
  • Events
Thursday, July 17, 2025
Newsletter
SUBSCRIBE
  • News
    • Contracts awarded
    • Open tenders and opportunities
    • Events
  • Features
  • Water
  • Wastewater
  • Gas
  • Electricity
  • Civil Construction
  • Events
No Results
View All Results
  • News
    • Contracts awarded
    • Open tenders and opportunities
    • Events
  • Features
  • Water
  • Wastewater
  • Gas
  • Electricity
  • Civil Construction
  • Events
No Results
View All Results
Home

Improving sludge management in water treatment

by Lauren Butler
August 28, 2018
in Company news, Sponsored Editorial, Water, Water and Wastewater Treatment
Reading Time: 4 mins read
A A
Share on FacebookShare on Twitter

The North Pine Water Treatment Plant provides clean, safe drinking water for the northern Brisbane and Moreton Bay regions. When the plant required a sludge residue handling upgrade, local water utility Seqwater engaged Zinfra as its principal contractor for the design and construct job. Having consistently worked with the utility since 2013, Zinfra has a strong understanding of Seqwater’s needs and requirements, and was able to offer several innovative solutions, delivering project efficiencies and numerous savings for the bulk water authority.

The North Pine Water Treatment Plant project centred around the provision of two new centrifuges to dewater sludge extracted during the water treatment process.

The centrifuges are located within a specialised dewatering building that also houses chemical dosing, solids storage, and water and air services, all of which are powered and controlled by the new Motor Control Cubical (MCC) for the facility.

In addition to the dewatering building and equipment, Zinfra upgraded the existing clarifiers and constructed a centrifuge feed tank, along with new pipework, electrical and control supply to all equipment, and road upgrades.

Efficiencies and strong collaboration result in limited operational impacts

All upgrade projects require some element of tie-in to the existing system that may result in significant impacts to plant operation.

Zinfra Project Manager, Spencer Walmsley, said that the majority of clients, particularly when it is a key asset such as the North Pine Water Treatment Plant, request limited interruptions to their daily operations.

“The project required six typical tie-ins, including high voltage power supply, service water, sludge inlet, sludge overflow, sludge disposal area (SDA) transfer pipeline and a final fibre optic/control integration. These were coordinated during existing planned shutdowns or completed with temporary bypasses.

“This resulted in limited operational impacts, in addition to all tie-ins being completed successfully and within the designated time frame,” Mr Walmsley said.

Zinfra also proposed a two-storey design for the dewatering building, where Seqwater had originally considered a split level building with significantly long conveyors (25m plus).

This reduced the overall construction footprint, including reducing the amount of access roads and new fencing required.

Ensuring proactive and effective stakeholder management

Mr Walmsley highlighted that construction on any brownfield operational plant always brings challenges, but proactive and effective reporting and communication during the design and construction phases identified several unforeseen challenges early on.

“Zinfra involves delivery staff during design phases early in the process to ensure construction limitations, time periods, and most importantly safety are considered and form part of the solution.

This helps facilitate the right design outcomes, saves time, reduces safety issues, and can highlight and resolve operational or access restrictions and issues early.

“Specific to the North Pine project, we established clear and transparent reporting along with routine progress meetings and numerous design workshops. In setting up these reviews and meetings to discuss and resolve issues being encountered or likely to be encountered, all parties were involved in the resolution strategies, culminating in the delivery of a successful project.”

Mitigating risks through consistent communication and robust procedures

Prior to site works commencing, progress meetings identified excavation and the potential presence of asbestos as two of the higher construction risks.

To mitigate these risks, Zinfra and Seqwater developed a site specific excavation procedure to reduce the potential of damage to existing known and unknown buried services, utilising Non Destructive Digging (NDD) techniques to verify the perimeter of excavations deemed to be in high risk areas prior to mechanical excavation activities commencing.

While a review of the site’s asbestos register identified that workers were not likely to encounter asbestos, the potential risk was still highlighted and site testing was carried out during initial decommissioning and tank refurbishment works.

According to Mr Walmsley, 11 of the 12 samples taken during drying bed demolition works confirmed the existence of asbestos piping which was uncovered prior to demolition commencing.

“The area was demarcated and barricaded off, and on confirmation of the results, a licensed asbestos contractor was arranged to remove all Asbestos Containing Materials (ACM), with work re-commencing following issue of a clearance certificate,” Mr Walmsley said.

Overall, Zinfra showed strong alignment of its core values and safety non-negotiables with Seqwater’s policies and procedures, delivering exceptional project outcomes for the North Pine Water Treatment Plant.

This partner content is brought to you by Zinfra.  For more information, visit www.zinfra.com.au

Related Posts

Image: Rädlinger 

Saving water and emissions

by Katie Livingston
July 16, 2025

Water is a valuable resource, and this is especially true in times of increasing weather extremes, such as floods or...

Image: Programmed

Bringing culture and connection to remote sites

by Katie Livingston
July 16, 2025

Beyond service delivery, Programmed helps build environments that foster connection, and support workforce morale in remote operations.  At 29Metals’ Golden...

Image: Schneider Electric 

Future-proofing water operations

by Katie Livingston
July 16, 2025

Faced with unprecedented challenges, water authorities are rethinking their operations, and they need digital tools that can keep pace.  The...

Read our magazine

Join our newsletter

View our privacy policy, collection notice and terms and conditions to understand how we use your personal information.
Utility is the title of choice for decision makers at all levels of water and energy utilities, as well as other major players like consulting engineers and first-tier contractors. Utility is integrated across print and online, and explores the biggest news and issues across the utility industry. It is Australia’s only dedicated utility magazine, and covers all areas of the utility sector, including water and sewer, gas, electricity, communications and the NBN.

Subscribe to our newsletter

View our privacy policy, collection notice and terms and conditions to understand how we use your personal information.

About Utility

  • About
  • Advertise
  • Subscribe
  • Contact
  • Digital magazine
  • Events
  • Terms & Conditions
  • Privacy Collection Notice
  • Privacy Policy

Popular Topics

  • News
  • Water
  • Electricity
  • Projects
  • Water and Wastewater Treatment
  • Spotlight
  • Civil Construction
  • Renewable Energy

© 2025 All Rights Reserved. All content published on this site is the property of Prime Creative Media. Unauthorised reproduction is prohibited

No Results
View All Results
NEWSLETTER
SUBSCRIBE
  • News
    • Contracts awarded
    • Open tenders and opportunities
    • Events
  • Features
  • Water
  • Wastewater
  • Gas
  • Electricity
  • Civil Construction
  • Events
  • About
  • Advertise
  • Subscribe
  • Contact

© 2025 All Rights Reserved. All content published on this site is the property of Prime Creative Media. Unauthorised reproduction is prohibited