Ernest Mayer Forum Moderator 52 Posts
Re: Is there a low-cost filtration method that can remove the majority of solids?14 July 2009 at 1:29pm
Since you don't want to use coagulants/flocculants, the best approaches are an automatic pressure filter (like an Oberlin, Pneumapress, or a Verti-press depending on the flow rate which again is stated; and the most important variable).
The second option would be a diaphragm filter press with a cloth washer. Both of these are batch, but there are many ways that a batch operation can be converted to a continuous operation.
The third option might be a decanter since you would be happy with 500mg/l in the effluent, (and this option would be continuous).
All of these are fairly costly, but testing will be required to get sizing as well as performance. The fact that you have anaerobically digested sludge suggests a difficult filtering material, (plus of course, the <50um particle size).
We are treating anaerobically digester slurry from farming operations. A solids separator followed by gravity-fed screens leaves us with an 85 degree F liquid that still has a suspended solids content of 15000 mg/L (1.5%). The particle size is < 50 microns, with a steep drop off below 20 micron. So, still a high volume of relatively small particles need to be economically removed.
Have an insight or suggestion?
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