Bermagui STP Capacity Assessment and Upgrade Strategy

  • ASpect’s Client: Eurobodalla Shire Council
  • Head Client: Bega Valley Shire Council
  • Plant Configuration: Carousel
  • Plant Size: 6,000 EP
  • Project Value: $22k (ASpect Fee $22k)
  • Project Duration: May 2017 to February 2018

Bermagui STP is a nominal 6,000 EP STP that services the townships of Bermagui and Wallaga Lake.  The area is a popular holiday destination, particularly in summer.  School holiday periods, Christmas and Easter see an influx of tourists and a sharp increase in sewage flows and loads.  Bermagui STP typically performs well but performance, particularly with regard to effluent ammonia nitrogen (NHx-N), often deteriorated at Christmas and (to a lesser extent) Easter.  There was also a short term release of phosphorus during holiday periods, which must be countered by Alum dosing to prevent licence breaches.  ASpect undertook a loading study, process unit capacity assessment and a more general process review.  This highlighted capacity deficiencies in a few key areas such as aeration and RAS pumping and a number of other process shortfalls.  ASpect made recommendations on interim solutions to overcome these shortfalls at minimal cost.