Filtration Plant – Technical – Diaphragm Valve Filter Range
|For removing suspended solids. Supporting layers of graded gravel are covered by a layer of 16/30 grade filter sand. This, in turn, is covered by filter grade anthracite. The coarser angular grains of anthracite form an efficient in-depth filter medium. This protects the filter sand, thereby reducing the possibility of blinding the sand layer which is then used to polish the water.|
|Activated carbon efficiently absorbs many low-concentration contaminants from water, removing taste and odour. It is also used for de-chlorination. A choice of activated carbon media is available. The media is supported on a layer of graded gravel.|
|Removes dissolved iron, thus preventing brown deposits. Burgess iron removal media has a catalytic action on dissolved iron. This media (which is supported on an underbed of graded gravel) initiates the oxidation of ferrous iron to ferric, and this insoluble form is then filtered out within the media. (Note that certain conditions must be met for the catalyst to act effectively – in particular pH>6.5 and oxygen equivalent to 15% of iron content).|
|A consumable media neutralises the acidity present in food water by dissolving.|
|Seamless pressure vessels with moulded polyethylene inner and glass-reinforced epoxy wound outer shell, complete with attached base. Internal distributors and collectors are of hub and lateral design, constructed from polypropylene and uPVC. Laterals have 0.5mm slots to prevent media loss.|
|A frontal pipework manifold in ABS includes the necessary diaphragm-operated valves for service, backwash and rinse functions. The valves include limit-stop devices to set backwash, rinse and service flows. The control-panel incorporates the backwash sequence timer and backwash initiation system which may be the time-of-day, running-time interval or initiated by an external signal.|
|Inlet Connections||inches||11/2||2||2 1/2||2 1/2||3|
|Outlet Connections||inches||1 1/2||1 1/2||2||2||2|
|Drain Connections||inches||1 1/2||2||2 1/2||2 1/2||3|
|DV Filters (SAND ANTHRACITE)|
Service flow rates are based on a superficial velocity of 12m/h
Backwash flow rates are based on a superficial velocity of 30m/h to give a bed expansion of 20% @ 5ºC.
|DV Filters (CARBON)|
Service flow rates are based on a superficial velocity of 15m/h. Gives an approximate contact time of 15 minutes.
Backwash flow rates are based on a superficial velocity of 25m/h to give a bed expansion of 30% @ 10ºC.
|DV Filters (BIRM – Iron Removal)|
Service flow rates are based on a superficial velocity of 12m/hr. Backwash flow rates are based on a superficial velocity of 24m/h to give a bed expansion of 35%.
Recommended Influent Limitations (BIRM ONLY)
pH range 6.8 – 9.0 Oil None
Dissolved Oxygen >15% of Iron Content Polyphosphates None (or added after filter)
Alkalinity >2 x (SO4+C1-) Free Chlorine <0.5ppm
Hydrogen Sulphide None
Temperature Range 3-45ºC
Organic Matter <5ppm