Charlotte Pass STP Capacity Assessment

  • ASpect’s Client: Charlotte Pass Village Pty Ltd
  • Head Client: Charlotte Pass Village Pty Ltd
  • Plant Configuration: IDEA, IFAS
  • Plant Size: 1,100 EP
  • Project Value: $20k (ASpect Fee $20k)
  • Project Duration:  October 2011 to January 2012

Capacity Assessment of the 1,100 EP Charlotte Pass STP (IFAS) for Charlotte Pass Village Pty Ltd.

Charlotte Pass STP in a unique facility.  Located at 1760m above sea level, it the highest STP in Australia.  The village is accessible only by over-snow transport throughout winter.  Its location within the Kosciuszko National Park and discharge to the pristine headwaters of the Snowy River demands tight licence conditions and significant regulatory scrutiny.  The tight nutrient discharge conditions demand reactor heating throughout winter.  The small available footprint lends itself to high biomass treatment in the form of Integrated Fixed Film Activated Sludge (IFAS).  With little in the way of permanent residents, it experiences a dramatic increase in load at the start of ski season, a time where snow melt can also lead to a rapid fall in sewage temperature.  This demands a strategy of load dosing (particularly nitrogen) leading up to the opening of the season to prevent pollutant breakthrough.  Charlotte Pass Village Pty Ltd were required by the regulator to undertake a capacity assessment of the STP and commissioned ASpect to meet the tight deadline imposed.  The work involved an assessment of design and current loading (correcting for the high nutrients associated with resorts and day visitors), development of a whole plant process model, calibration and troubleshooting, unit by unit capacity assessment to identify bottlenecks, a list of prioritised action items to overcome them and advice as to how operational performance could be optimised.  The findings led to increased capacity and vastly improved operational stability with minimal expenditure.