Eden STP Environmental Audit

  • ASpect’s Client: Bega Valley Shire Council
  • Head Client: Bega Valley Shire Council
  • Plant Configuration: SBR, IDEA
  • Plant Size: 8,000 EP
  • Project Value: $57k (ASpect Fee $57k)
  • Project Duration:  May 2010 to May 2011

Troubleshooting, capacity assessment and licence compliance audit of Eden STP (SBR) for Bega Valley Shire Council (NSW).

Bega STP is an 8000 EP facility located on the far South Coast of NSW.  It is owned by Bega Valley Shire Council (BVSC), but operated under contract by Tenix.  Eden, like much of the south coast, experiences a sharp spike in tourist population over holiday periods, particularly summer.  Summer is also the time of greatest rainfall intensity, challenging capacity and performance.  In response to a number of operational shortfalls over previous years, the regulator (NSW OEH) imposed a licence condition on BVSC to undertake a comprehensive environmental audit of Eden STP and its operations.  BVSC engaged ASpect to undertake this study, which is one of the most varied and comprehensive operational studies ever undertaken by ASpect.  It included the following audits and reviews.

  • An investigation of current loading, including sewage characterisation, wet weather events and the impact of summer tourism.
  • Performance capability assessment including a review of the facilities, performance data, benchmarking against similar facilities and an assessment of whether the facilities should be capable of meeting the licence limits.
  • A detailed capacity assessment including the development of a process model, review of design criteria and sizing, review and optimisation of reactor trigger levels and a unit by unit capacity assessment it identify capacity bottlenecks.
  • A performance assessment that compared actual data to capabilities and limits, a detailed review of recent poor performance events and a set of recommendations for how to optimise performance and mitigate failures.
  • A review of operational management including the thoroughness of operational documentation (operating manual, functional description and SOPs), the adequacy of process monitoring, a review of automated control and alarms and the adequacy of manning levels and expertise.
  • A review of the adequacy of liquid trade waste control and management.
  • An audit of compliance with each and every licence condition, including monitoring, limits, records keeping, reporting, incident management and operating conditions.

The audit resulted in a list of 100 recommendations and resulted in improved operating documentation, a change to the way wet weather was treated, improved automation and control, increased aeration control and capacity, and optimisation of reacting timing and levels.