City Council selected a High Efficiency Biological Treatment Process for the new facility.


Staff and Council looked at three options for the treatment process:

  1. Trickling Filter/Solids Contact Process

  2. High Efficiency Biological Treatment Process (chosen process)

  3. Extended Aeration Process


Project engineers Associated Engineering used a triple bottom line evaluation method looking at several social, environmental and financial factors as well as risk to help staff and Council evaluate and score each option. Council chose the High Efficiency Biological Treatment Process because it scored the highest on the balance of all factors.


The factors used in the triple bottom line evaluation included:



  • Preservation of existing trails

  • Visibility of treatment facility

  • Noise, traffic, and light

  • Overall facility footprint


  • Preservation of existing trees

  • Greenhouse gas emissions

  • Construction disturbance


  • Capital cost

  • Operational cost

  • Maintenance cost

  • Cost for future expansion (if required)



  • Risk of odours inherent to specific treatment processes

  • Future ability to meet increasingly stringent regulations

  • Retrofitability


3D images showing the proposed scale and general layout for each option are available below. All vegetation has been removed from these images in order to show the facility clearly.

Option #1 - Trickling filter/solids contact process

Option #2 - High Efficiency Biological Treatment Process

Option #3 – Extended Aeration Process

© 2018 City of Powell River

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