Attachments 11.4 and 11.5 - City of Busselton

ATTACHMENT C - TREATMENT OPTIONS CONSIDERED IN THE COUNCILLOR WORKSHOP OF MAY 2011
ITEM 11.4 COUNCIL 12/10/2011
8
Weighing up the options
Option
WQ improvement
Yes/No Unproven
Visual only
Cost
High/
Medium/
Low
Phoslock Yes $200,000
every 3-5
years
Chitonase – CSIRO
researching this product
Unknown in large
situations
Potentially high
cost
Priority
High/
Medium/
Low
Low
Low
Notes / action
Short term treatment. If there is an influx of nutrient, such
as during a summer storm event, the Phoslock would have
to be reapplied.
Yet to be proven in large applications. Assess this product
when it has been further developed.
NUA, as a filter medium. Unproven Medium Low Yet to be proven in large applications. Assess this product
when it has been further developed.
Bio-filtration Yes Low Low Investigate possibility to use stormwater bio-filtration system
at Bunbury Street during the summer season.
Macrophytes Yes Low High Pursue creation of more meadows for monitoring and
farming.
Enzymes Unproven Low Low Unproven in large application in natural area. Supplier funded
testing under controlled conditions could be allowed.
Water conditioner Unproven Low Low Unproven in large application in natural area. Supplier funded
testing could be allowed.
River Bank Re-instatement Limited Medium Medium The improvement would mostly be aesthetic but would
complete the works that have been done along other banks
of the river
Ultrasound Unproven Low Low Unproven in large application in natural area. Algal cells once
killed available for nutrient recycling. Unlikely to be effective
in a large bloom.
Sewerage In-fill Yes High High Lobby State Government to fund in-fill sewerage.
Nutrient Loss reduction in
Catchment
Yes High – Low Low Continue to support.