BCWWA – Water Reuse

Troy D. Vassos of NovaTec presents an international look at water reuse on the smallest scale – right down at the individual building or lot.

Rainwater use for fire toilet cooling, laundry. Often not enough rain
Stormwater – when there’s too much – goes to Low Impact Development (LID)
Reuse Water – reusing wastewater to toilet and urinal, landscaping irrigation, fire supression, cooling
Sewer Mining is a possibility and economically viable.

Integrated Water Management
Water Conservation – Not just water restrictions – but also water reuse such as grey water, and rainwater harvesting.

  • reduce the cost of infrastructure
  • minimizes site runoff
  • directing stormwater to natural courses
  • greenroofs
  • rain gardens
  • bioretention
  • cisterns
  • constructed wetlands

Troy examined some of the Australian methods of reducing and reusing water, including the Basix program as run by the New South Wales Government. The WELS scheme. Water Efficiency Labeling

Wastewater Treatment & Reuse
Light Grey – Bathroom Sink, Shower, Bathtub, Laundry
Dark Grey – Kitchen Sink
Black Water – Toilets and Urinals

Direct light grey water reuse is permitted in Australia, New Mexico, Arizona.
Australia as a Preventative risk Management Approach and Restricted Public Access.
In North America, two systems are currently being sold that are direct reuse, inside the house, Aquis and Bracs. Neither of these are currently allowed under BC plumbing code.

New Health Canada Reuse Guidelines were presented which allows for the reuse of water in toilet flushing under the draft, which I’ve covered before on this blog.

Published by Mike Thomas

Mike Thomas P.Eng. ENV SP, is the author of UrbanWorkbench.com and Director of Engineering at the City of Revelstoke in the Interior of British Columbia, Canada.