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  1. RYANTD

    sludge weight (lb/ft3)

    This worked for me. The mass of solids in a slurry is related to the volatile and fixed suspended solids content. If Ss = Sp. Gr. of the slurry, Sw = Sp. Gr. of water, Sv = Sp. Gr. of VSS, Sf = Sp. Gr. of FSS, Mw = mass of water, Mv = mass of VSS, and Mf = mass of FSS, then since Ms/Ss =...
  2. RYANTD

    sludge weight (lb/ft3)

    BIMR: I have been searching for numbers on sludge and % dry solids, and found a range. One is sludge 54lbs/ft3(comment: must be very dry?). One is SG = 1.3 One is lime stabilized sludge is 100 lbs/ft3 (@20% lime per lb dry solids)(I assume your number is per ton dry solids). Then I had a...
  3. RYANTD

    sludge weight (lb/ft3)

    I am trying to find the density of a municipal WWTP sludge at 30% dry solids,lets say in lbs/ft3 (the sludge is a mix of primary and secondary, no digestion). I also want to land apply it, so it has to be mixed with lime for stabilization. (I would also like to know the mixing requirements and...
  4. RYANTD

    Sch. 40 PVC vs. SDR21 PVC, how different are they?

    Why is the ASTM standard for SDR 'pressure rated' wheras the ASTM standard for Sch 40 is not designated 'pressure rated'? ie - what is the significance of 'pressure rated'? Additionally, schedule pipe allows for up to 20% non PVC content, and SDR pipe doesn't. I would appreciate any comment...

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