16-001014-02A (Ultimate SCMMP)

     FAQs

     • Can the boom become stuck?                                • Why is the HumeGard® GPT larger than other GPTs?
       The smallest boom weighs 80 kg. Unless there is a           The design of the HumeGard® GPT is to ensure a
       large branch, car wheel, or other large item carried        velocity through the treatment chamber <0.2 m/s
       through the drainage network, the mass of the boom          to ensure the comb self-cleans. From engineering
       will ensure it returns to the floor.                        principles, a larger cross-sectional area is required to
                                                                   reduce the loading rate. As proven by Stokes Law, lower
     • Will the gross pollutants bypass when the
                                                                   chamber velocities mean smaller sediment particles
       boom floats?
                                                                   can be captured.
       All treatment measures are designed to treat a specific
       flow. Once this is exceeded, any entrained pollutants     • Why would I use a HumeGard® GPT upstream of
       in the flow will bypass the treatment chamber. Often        a biofilter?
       this is less than 5% of the annual load. Unlike fixed       Using a HumeGard® GPT upstream of a biofilter acts as
       weir devices floating material is still retained behind     a sediment forebay and removes litter, containing it to
       the boom even during bypass.                                a confined location for easy removal by a vacuum truck.
                                                                   This protects the biofilter, lengthens its lifespan and
     • Will the retention of water in the treatment chamber
                                                                   reduces the ongoing maintenance costs.
       lead to the release of nutrients as pollutants
       break down?
       Over time, captured organic materials will breakdown
                                                                 References
       and release nutrients in all treatment measures
       whether natural or manufactured. As part of a
                                                                 • Waste Management Council of Victoria (1998) “Inline
       treatment train, downstream vegetated measures
                                                                   Litter Separator: Installation and Monitoring Project”,
       can remove the small proportion of nutrients released
                                                                   EcoRecycle, Victoria.
       during dry weather flows. A regular maintenance
                                                                 • Trinh, N. An Investigation into the Trapping Efficiencies
       program will reduce the amount of breakdown
                                                                   of Gross Pollutant Traps. Thesis. Brisbane, Queensland:
       occurring.
                                                                   Queensland University of Technology, 2007.
     • What is the design life of a HumeGard® GPT?               • Woods, S. Performance Evaluation of an In-Line
       The entire product is designed to last a minimum of         Separator. Masters Thesis. Melbourne, Victoria:
       50 years.                                                   Swinburne University of Technology, 2005.
                                                                 • Swinburne University of Technology (2000)
                                                                   “HumeGard® In-line Litter Separator Sediment Capture
                                                                   Testing”, School of Engineering and Science.
                                                                 • Engineers Australia (2006) “Australian Runoff Quality”.
                                                                 • Lucke, T. 2015, Characterisation of Water Quality
                                                                   Improvement Processes by GPTs at University of
                                                                   the Sunshine Coast (Humegard HG27 Monitoring
                                                                   Program), School of Science and Engineering,
                                                                   University of the Sunshine Coast, QLD, Australia.




10   HumeGard® GPT