Adaminaby and Bombala STPs Detailed Design

  • ASpect’s Client: Hunter H2O
  • Head Client: Snowy Monaro Regional Council
  • Plant Configuration: SBR
  • Plant Size: 1,000 EP and 2,000 EP
  • Project Value: $20M (ASpect Fee $87k)
  • Project Duration: October 2017 to Ongoing

Adaminaby and Bombala STPs lie in the Monaro region of NSW, bordering the Australian alps.  Snowy Monaro Regional Council wanted to replace the outdated trickling filter plants with modern activated sludge technology.  Both plants discharge to sensitive rivers, demanding a very high standard of treatment.  The cold temperatures placed additional demands on the plants, particularly with regard to advanced nitrogen removal.  ASpect, working with Hunter H2O, undertook and options assessment on each process unit and delivery strategies for the plants.  The outcome was to deliver identical processes at both plants than included package inlet works, advanced nitrogen removal SBR reactors, tertiary filtration, UV, muti-point phosphorus precipitation, sludge lagoons and drying beds.  The very small scale and high complexity of the plants presented an opportunity for an innovative solution.  An identical design was developed for both plants, delivering twice the capacity for Adaminaby at a 7% increase in cost.  This spare capacity could be utilised for full treatment of all wet weather flows, buffering of sudden increases in tourist population, future growth stemming from Snowy Hydro 2.0, the possible future sewering of outlying towns, and increased tourist numbers from Canberra.   The strategy also halved the design and delivery costs.  ASpect’s tasks were options assessment, process design and controls design.