• Asia Pacific Rentals & Services
  • 20/05/2025

SEQUENCING BATCH REACTOR WASTEWATER TREATMENT PLANT FOR EXXONMOBIL

Centurion Water & Wastewater Solutions delivered a modular Sequencing Batch Reactor (SBR) wastewater treatment plant for ExxonMobil’s Papua New Guinea LNG project, expanding capacity from 500 to 750 equivalent persons. The system integrated with existing infrastructure, used durable materials, and minimised operator input. By reusing key assets and enabling effluent reuse, Centurion provided a cost-effective, compliant, and scalable solution with long-term operational benefits.


The Client
ExxonMobil Papua New Guinea LNG project.

To support the growing workforce of the ExxonMobil project in Papua New Guinea, an upgraded wastewater treatment system was required. Centurion Water & Wastewater Solutions was engaged to deliver a modular Sequencing Batch Reactor (SBR) Wastewater Treatment Plant (WWTP) that could manage fluctuating camp populations while meeting strict effluent discharge requirements.

The initial scope involved supplying a 500-person equivalent (EP) wastewater treatment plant, followed by a 250 EP expansion module, increasing the total treatment capacity to 750 EP.

Client Challenges

  • Scalable design - the solution needed to integrate with the existing Hides Gas Conditioning Plant (HGCP) SBR system and support future capacity increases
  • Fluctuating camp populations - workforce fluctuations required a system capable of handling significant variation in flow and load
  • Material durability - all infrastructure had to withstand harsh environmental conditions, necessitating high-grade stainless-steel materials
  • Reliability and minimal operator involvement - the plant needed to operate reliably with minimal manual operation
  • Options to reuse infrastructure - cost-effective use of existing infrastructure was a priority to reduce overall capital expenditure.

Our Solution

Centurion delivered a comprehensive wastewater treatment solution with a focus on modularity, durability, and efficiency:

500 EP SBR Wastewater Treatment Plant

  • Modular design similar to the existing HGCP SBR system for seamless integration
  • Tanks fabricated from 316 stainless steel for superior durability in challenging environments
  • Engineered for easy operation and maintenance.

250 EP Expansion Module

  • Scaled the existing system’s capacity from 500 EP to 750 EP
  • Included a 90m³ balance tank (316 stainless steel) and an anoxic/aerobic tank constructed from carbon steel with a chemical-resistant coating
  • Integration with existing infrastructure, including the sewage pumping station, sludge storage, and treated effluent tanks.

Results

  • Modular scalability - enabled staged capacity increases without disrupting ongoing operations
  • Operational reliability - robust Sequencing Batch Reactor technology delivered consistent performance with minimal operator involvement
  • Long-term durability - high-grade, stainless-steel material and chemical resistant coatings ensured system longevity and compliance
  • Reduced manual handling - upgraded IBC dosing container to reduce manual chemical handling
  • Effluent reuse and water savings - designed the disposal system to HGCP specifications, enabling safe effluent reuse and reduced water consumption through spray field disposal
  • Cost savings - by reusing the existing sludge dewatering system from the original 500 EP plant, minimising additional capital investment.

Conclusion

Centurion Water & Wastewater Solutions successfully delivered a modular, high-performance wastewater treatment plant tailored to meet the evolving needs of ExxonMobil's LNG project. Through a combination of durable construction, scalable design, integration with existing assets, and the reuse of infrastructure, Centurion delivered a fully compliant, cost-effective solution for the client.

Contact Information
For more information, contact the team in Perth, Western Australia at E: CWWSAU@centurionaprs.com, T: +61 8 9331 6133, or in Brisbane, Queensland on T: +61 447 610666.

Have a look at our other case studies.