Kianga STP Capacity Assessment

  • ASpect’s Client: ESC
  • Head Client: ESC
  • Plant Configuration: Carousel
  • Plant Size: 8,000 EP
  • Project Value: $20k (ASpect Fee $20k)
  • Project Duration: February 2015 to June 2015

Kianga STP Capacity Assessment (NSW).

Eurobodalla Shire Council (ESC) were concerned about the capacity of the Kianga STP, which services the Narooma area of the NSW South Coast.  The area is a popular tourist destination, especially during the summer school holiday period.  The performance of the plant was generally excellent, but it struggled to maintain nitrification over the holiday period, when loading increased markedly.  The plant consists of two Stage 1 Pasveer Ditches, converted to wet weather storage at Stage 2.  The Stage 2 plant consists of sewage balancing, screening, grit removal, a carousel reactor, clarifiers, tertiary ponds, final effluent pumping and a reclaimed effluent disinfection system.  Sludge handling includes sludge lagoons, drying beds and a biosolids hard stand.  ASpect analysed the available sewage data and planning data to determine the typical current loading.  Summer sewage data plus holiday loading assessments were used to determine the high strength peak loading.  A granular capacity assessment was then undertaken using a calibrated whole plant operating model. The plant was assessed based on current and optimised operating criteria to maximise capacity.  This resulted in a capacity rating (generally EP) for each process unit and equipment item.  Capacity bottlenecks were identified to allow pareto upgrade investment decisions to be made to expand the plant capacity at minimum cost.