Subsurface flow wetlands require the following maintenance tasks : regular checking of the pretreatment process, of pumps when they are used, of influent loads and distribution on the filter bed.
22.
An e-mail sent to all MSHA offices in March suggested that the air flow in the vacuum pumps be more than doubled and a new, more effective collection filter be used.
23.
Care must be taken when milling to ensure that the starch reserves are sufficiently milled without damaging the husk and providing coarse enough grits that a good filter bed can be formed during lautering.
24.
While a hopback has a similar filtering effect as a whirlpool, it operates differently : a whirlpool uses centrifugal forces, a hopback uses a layer of whole hops to act as a filter bed.
25.
After the air scour cycle, clean backwash water is forced upwards through the filter bed continuing the filter bed expansion and carrying the particles in suspension into backwash troughs suspended above the filter surface.
26.
After the air scour cycle, clean backwash water is forced upwards through the filter bed continuing the filter bed expansion and carrying the particles in suspension into backwash troughs suspended above the filter surface.
27.
Hammer mills, which produce a very fine mash, are often used when mash filters are going to be employed in the lautering process because the grain does not have to form its own filter bed.
28.
When he raised the issue at a meeting and suggested that filters be added to the chimneys, the concern was dismissed as being too difficult to deal with and was not even recorded in the minutes.
29.
The final key design point is to be sure that the fluid is properly distributed across the bed and that there are no preferred fluid paths where the sand may be washed away and the filter be compromised.
30.
The sewer that was constructed for the Nambour CBD in 1912 was flushed out daily with 500 gallons of water from the mill's tanks, through a filter bed of sand and ashes, and water was supplied to both hotels in Nambour by 1937.
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