Fish can reduce sludge volumes in water treatment

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Fish can reduce sludge volumes in water treatment

September 22, 2016 - 16:55

Wannon Water Company have been undertaking trials over the past 8 years in conjunction with Deakin University to investigate the use of fish to reduce sludge volumes in primary effluent lagoons.  Results to date show that fish can reduce sludge volumes by between 33% and 46% over a 70 day period in 1000L tanks.  Incorporating fish into primary effluent lagoons has the potential to significantly extend the timeframe between de-sludging events.

De-sludging sewage treatment lagoons can be an expensive and messy process, and a significant disruption to the operation of the sewage treatment facility. Reducing the frequency of de-sludging has the potential to lead to significant OPEX savings and may even enable utilities to offset investment in new lagoons as demand grows.

Deakin University researchers have conducted two literature reviews and three honours projects on various aspects of this investigation, including the rearing of sterile hybrid goldfish specifically developed for stocking the lagoons.

Wannon Water is seeking funding partners to complete the following work:

    Full scale trials on an operational Water Reclamation Plant in Port Campbell (Victoria).  Port Campbell has a twin primary effluent lagoon system that will enable a direct comparison between a lagoon with fish and a lagoon without
    Fish stocking, water quality monitoring, sludge surveys, and monitoring of  fish
    Quantify desludging benefits
    Monitor EPA licence compliance
    Quantify fish biomass production
        Timeframe: 2 years (mid 2017 completion)
        Total Project Cost: $0.5M

Note that this trial is already underway - commenced late 2015.  Wannon Water is now providing the opportunity  to make this research available to others in the Water Industry who wish to become a partner in the project.


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