Sand Filters
Sand Filters
(OP)
Not sure how to specify the pressure requirement of a pump when sizing a pump for a deep bed pressurized sand filter (Total bed depth 2 metres in six graded layers) with a desired flow rate of 120-180litres per min. The pump is for duty only. The filter is 1.8m in dia. In addition am I correct to assume that the backwash pump will need to be atleast double the flow rate and similar pressure?
The filter is to be used as tertiary stage of ground water treatment to pick up any break through of iron or manganese oxide.
Can anybody recommend some literature to assit me in learning more about sizing and specifying sand filters for ground water treatment?
The filter is to be used as tertiary stage of ground water treatment to pick up any break through of iron or manganese oxide.
Can anybody recommend some literature to assit me in learning more about sizing and specifying sand filters for ground water treatment?





RE: Sand Filters
Regards
Seán
www.seanmoran.co.uk
RE: Sand Filters
For the system that you are proposing, the throughput headloss will probably vary from .14-.35 bar for a clean filter to 1-1.3 bar for a dirty filter.
The backwash headloss is actually lower than the throughput headloss because you will be fluidizing the media at a much higher velocity. The backwash pump should be sized to deliver 37.5 m/h.