Since 1986 we have designed and manufactured rotary milliscreens that are specifically designed to separate solids from liquid discharges, whether it is waste water treatment for city councils or vegetable waste from food processing industries.
The Farra screen has a number of unique advantages over others in the market. The waste water enters the screen barrel via a specifically designed baffle system that reduces the flow of the incoming waste water and results in an even flow over the three sided weir onto the screen. The milliscreen rotates at a constant speed, the cleaned water passes through the wedge wire and the solid waste works its way to the end of the screen due to the conical shape of the barrel where it can be disposed of or treated further.
The screen mesh is self cleaning with internal and external sparge pipes with low and high pressure water jets that remove any residual matter.
We have recently manufactured four new screens for the Gisborne District Council as part of a multi million dollar upgrade of their treatment process being managed by Beca. This was won through an international tender process so it was especially pleasing to secure this.
We have just delivered a further screen for the Nelson Regional Sewage Business Unit Bells Island waste water treatment plant. This was secured through Waste Solutions, a division of CPG New Zealand. They specialise in innovative turn-key wastewater treatment solutions using anaerobic digestion and biogas capture.
On the local front we have also made recently a smaller screen for the Mosgiel waste water treatment plant through Fulton Hogan. This screen has a slightly different purpose than the Nelson & Timaru screens; it is used for the removal of larger foreign objects that find their way into the waste water system during high inflows.
We have also recently installed two much smaller units into Blenheim wineries where the screens are used to remove the grape skins and stalks from the grape juice.
The screens are used for a wide range of applications in various industries and because of the many variables we get the client to provide us with as much information as possible prior to any recommendation. This includes type of wastewater/effluent, maximum flow rates, maximum size of the solids permitted in the treated water etc. Once we have received that we calculate the wedge wire and screen size accordingly.
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