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Products and Services for Fisheries - The Environment - Aquaculture - Waste Water Treatment FLTC Sludge ThickenersFLTC Sludge Thickener The FLTC is a very versatile filter, which concentrates solid debris in heavily soiled water. It can be used to concentrate the dilute slurry from the spray bar wash water of drum filters, such as the FAM 600 range. It can even handle greasy water, and is therefore ideal for the recycling of processing water. It can even work in place of a drum filter, as it concentrates solids 15 to 50 times the concentration using conventional microstrainers. how is this achieved? FLTC works by combining microscreening with an auger, which pushes solids and flocculated sludge to the end sludge outlet. The sludge can be collected dry in a trough at the end, or channeled to a slurry receptacle. Water is recovered from all but the end screen-washing nozzle, thus wasting very little wash water. Benefits Absolutely no contact between the waste water and the filtered water Outlet sludge water-content can be varied Very low water loss with sludge Easy-change mesh screen panels Fish recycling / flow-through systems During trials, FLTC has excelled at processing spray bar wash water taken from a microstrainer drum filter (see results summary below) Properties of water entering the FLTC Properties of slurry leaving the FLTC Flow rate m3 /h 7.26 0.24 Suspended solid content kg/h 1.48a 1.16b mg/l 203.5 4831.3 Filter Efficiency = 78% ( b/a x 100) The above results were recorded by a French coastal farm on waste from marine fish nursery ponds. They were the average figures from 13 readings of the effluent treated in a FLTC filter equipped with a 30 micron screen. The trial was conducted at a French coastal farm in a marine recycling system The FLTC filter the water from the spray bar effluent from a large microstrainer drum filter Maximum concentration of SS recorded at inlet: 514 mg/l Maximum water flow recorded at inlet: 8.5 m3/h Maximum concentration of collected SS at FLTC sludge outlet: 9000 mg/l (9g/l) Rate of concentration observed: between 15 and 50 x Average output for collection of SS: 78% As can be seen from the above results, suspended solids can be concentrated up to 9g per litre. This compares to 0.3g per litre for a conventional filter. From an extensive programme of trials, FLTC has been developed to give the optimal relationship between drum rotation speed, screen aperture and clean water jet pressure. In fact, the time the water takes to be treated is controlled within seconds. The continuing development programme is aiming, in the near future, to improve the slurry concentration from 9 to 140g per litre. This is the concentration that slurry can be turned into pellets. However, the current achievement of 9g per litre makes the handling of slurry much easier and any slurry storage lagoons much smaller. FLTC can handle flow rates up to 400m3 per hour, and screens are available with mesh sizes of 2mm down to 20µ. Screen panels are readily maintained. FLTC can be made in 304 / 316 / 316Ti grades of stainless steel, and in the form of a box or tube. Note that, for tertiary treatment lagoons, it is convenient to use reed rafts to absorb nutrients and suspended solids. These also provide a rich habitat for wildlife, offering an attractive green screen, thereby enhancing the environment. |
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| Spirex Aquatec Ltd Bradley Green
, Redditch
, Worcestershire, B96 6TN, United Kingdom - Show Map - Tel: +44 (0) 1527 821 601 Email: info@spirexaquatec.com Member of the Institute of Fisheries Management. Company Registration Number 4524471. Registered in England and Wales. VAT Number GB803548439. |
Copyright © Spirex Aquatec Ltd 2012