clamps 35a may be bolted to support tube 34 by bolts 36a there is also shown in fig5 a header or manifold 40 for support tube 34 which convey liquid waste through opposed conduits 39 to each side of curtain 16 adjacent flange 33 this may be by way of drip feed or by use of jets or nozzles as required the arrows in full outline in fig5 indicate the downward passage of the liquid waste having regard to each curtain 16 there is also included waste collection trough 42a and associated transfer conduit 43a there is also shown in fig6 opposed conduits 38 for conveying warm humidified pressurised air to each side of curtain 16 adjacent flange 33 each conduit 38 communicates with air manifold 37 the air feed means is omitted from fig5 for the sake of clarity and convenience fig7 shows a detailed view of support rods 24 supporting flanges 33 of each curtain 16 whereby rods 24 engage in notches 41 in the ends of flanges 33a there is also shown crane attachment location 27 in fig8 9 there is shown a modified assembly to that described in fig5 6 in this assembly curtains 16 and associated top flanges 33a are attached to support rods 24 as already shown in fig7 waste feed conduits 34a transport liquid waste via opposed conduits 39a and air jets 38a are attached to an associate air feed conduit 37a which communicates.