The laboratory scale Deep Bed Filter Column has been designed to operate identically to full scale granular filters. Using the same bed depth and filter media, tests on this unit provide operational data which may be scaled up to full size. Pilot trials of possible filter designs for water and sewage works can be made reliably at low cost.
DESCRIPTION
The Deep Bed Filter Column is a clear acrylic unit with flanged end pieces to allow easy access. The medium is supported on corrosion resistant gauze mesh below which is packed 1kg of 10mm Ballotini to ensure good wash water distribution. Slotted sampling tubes inserted through the wall penetrate into the media, and are fitted with control valves so that suspension samples can be taken isokinetically. Plain tubes also penetrate the medium through the wall to transmit pressure to a manometer system. These sampling and manometer probes are located at 20mm depth intervals, but staggered in position, over 0.8m depth. Consequently, complete profiles of concentration changes in the suspension and of pressure variation can be measured during filter operation.
The column can be operated as a pressure filter up to 1 barg. The service system supplied comprises a pump, sump tanks, flow controller, rotameter, control valves, tubing, sampling tubes and bank of water differential manometers.
DEMONSTRATION CAPABILITIES
measuring how fast total head loss increases with filtration run (fig. 1)
measuring pressure drop profiles through the filter bed
measuring suspension concentration profiles through the filter bed (fig. 2)
demonstration of reversed flow fluidisation and backwashing
Utilities Required
Filter Media: Approx 10kg of a test medium is required to pack the column.
Suitable alternatives include well rounded quartz-grain sand BS16-30 mesh
(1.0-0.5mm), anthracite, crushed flint or aluminium oxide
Electrical supply: 220-240V/1ph/50Hz
Water supply: Initial fill and laboratory drain.
TECHNICAL DETAILS
Product & Code
Deep Bed Filter Column & WT 05
Filter column
Clear acrylic, 100mm internal diameter x 1350mm long
