All right, here's the deal...
I'm having big trouble getting more than 10 barrels across our 10 square meter Velo without blinding the thing. I've tried DE (Pre-coat with cellulose, follow with FW14 and then FW12) which blinds generally in 7 barrels, and Perlite (cellulose plus perlite pre-coat, I'm not sure about the grade) which takes about 15 barrels to blind.
Things to note: there are two screens in the main body of the filter that are warped. They were warped when I started playing with this thing, but my filtration has taken a strong downward turn with DE and is starting to jam up on the Perlite.
I've found that over-dosing has been an issue, but I don't think that I'm pushing too much into the body feed any more. So, what the hell is going on? Turbidity is variable, and there is of course a correlation between the turbidity on the inlet side and rapid pressure builds.
I'm pre-coating at 100-110 hL/hr, with 0 bars pressure (I've done it with DE at 0.5 bars and 60 hL/hr during the pre-coat with similar results), at the Velo-recommended level of 5 kg cellulose and 15 kg DE, but I've done less (20% by weight) and more (5% by weight). Even after taking notes, I'm not seeing any trends in the data, and I think that I'm going to have to go after the thing with a hammer just to keep my sanity.
If anybody has any leads, please let me know.
Cheers,
Bill
I'm having big trouble getting more than 10 barrels across our 10 square meter Velo without blinding the thing. I've tried DE (Pre-coat with cellulose, follow with FW14 and then FW12) which blinds generally in 7 barrels, and Perlite (cellulose plus perlite pre-coat, I'm not sure about the grade) which takes about 15 barrels to blind.
Things to note: there are two screens in the main body of the filter that are warped. They were warped when I started playing with this thing, but my filtration has taken a strong downward turn with DE and is starting to jam up on the Perlite.
I've found that over-dosing has been an issue, but I don't think that I'm pushing too much into the body feed any more. So, what the hell is going on? Turbidity is variable, and there is of course a correlation between the turbidity on the inlet side and rapid pressure builds.
I'm pre-coating at 100-110 hL/hr, with 0 bars pressure (I've done it with DE at 0.5 bars and 60 hL/hr during the pre-coat with similar results), at the Velo-recommended level of 5 kg cellulose and 15 kg DE, but I've done less (20% by weight) and more (5% by weight). Even after taking notes, I'm not seeing any trends in the data, and I think that I'm going to have to go after the thing with a hammer just to keep my sanity.
If anybody has any leads, please let me know.
Cheers,
Bill
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