Jellyfish Compliance with SEQ MUSIC Modelling Guidelines · MCU15/0122

    Flow into the lower chamber must then pass tangentially    Self-cleaning functions
    around the separator skirt protecting the cartridges
    and increasing the flowpath length. Coarse sediment        The JellyFish® filter utilises several self-cleaning
    settles out of the MAW zone into the sump. As water        processes to remove accumulated sediment from the
    flows tangentially around the separator skirt in the       external surfaces of the filtration membranes, including
    lower chamber, the large opening in the bottom of the      automatic backwash of the high-flow cartridges,
    separator skirt and upward change in direction further     vibrational pulses, and gravity. These processes have
    reduces flow velocity and enhances particle separation.    been confirmed by more than 12 months of full
    As a result, sediment settles in the sump.                 scale prototype testing. Combined, these processes
                                                               significantly extend the cartridge life, maintenance
    Flows pass through the cartridge in the filtration zone.   interval and reduce life-cycle costs.
    Each filter cartridge consists of multiple tentacles.
    Hydraulic pressure across the entire membrane surface      Automatic backwash occurs with the high-flow
    area causes water to penetrate the filtration tentacles.   cartridges at the end of each runoff event. This can occur
    Water enters the membrane pores radially and deposits      multiple times during a single storm event as intensity
    fine particulates on the exterior membrane surface.        and driving head varies. As the inflow subsides and
    Filtered water flows into the centre drain tube of each    driving head decreases, water in the backwash pool
    tentacle, the water then flows upward and out the top.     reverses flow direction and automatically backwashes
                                                               the high-flow cartridges, removing sediment from the
    Water exiting the top of the tentacles combines under      membrane surfaces. Water in the lower chamber (below
    the lid, where the combined flow exits the cartridge       deck) is displaced through the draindown cartridges.
    through the orifice with a pulsating fountain effect
    into the backwash pool. When the water level in the        Vibrational pulses occur as a result of complex and
    backwash pool exceeds the weir height it overflows to      variable pressure and flow direction conditions that
    the outlet pipe.                                           arise in the deck during operation. During forward flow
                                                               a stream of filtered water exits the top of each filtration
    Outside the backwash pool, the draindown cartridge         cartridge and encounters resistance from the turbulent
    provides treatment at a reduced flow rate (2.5 L/s) and    pool of water in the backwash pool. Water is forced
    allows the treated water captured in the backwash pool     through the cartridge lid orifice into the backwash pool
    to return through the cartridges and balance water         with a pulsating fountain effect. The resulting pulses
    pressure as the storm event ends.                          transmit vibrations through the deck to the membranes,
                                                               thereby dislodging accumulated sediment. The effect
    As particles build up on the external membrane surface,    is pronounced at higher flow rates, and influences
    the pores progressively become smaller. This process,      all cartridges.
    referred to as “filter ripening”, significantly improves
    the removal efficiency relative to a brand new or clean    Accumulated sediment on the membranes will settle
    membrane. Filter ripening accounts for the ability of      under gravity both during inflow events and inter-event
    the JellyFish® filter to remove particles finer than the   dry periods. As fine particles form into larger masses
    nominal pore size. An animation of the JellyFish® filter   on the membrane surface, adhesion to the membrane
    operation and maintenance is available at humes.com.au.    surface lessens, and sediment sheds away from the
                                                               membrane. Chemical processes and biofilm effects also
                                                               play a role.




6   JellyFish® filter