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Q (Mohammad Abu-Orf)

My question is with regard to the dewaterability part of your study. I did some similar work with pulse power treatment. Although we did not see changes in the characteristics of the sludge that would lead to differences in dewaterability like surface charge, particle size analysis, and zeta potential, we have seen a difference in the dewaterability, when you actually dose the solids with polymer. Maybe what I am wondering is that we really do not yet understand why the sludge is dewaterable or not for you to go and measure these parameters and lead to the conclusion that the electron beam did not enhance sludge dewaterability. That may be limited by the technique or the sample that you used. How big of samples did you use each time you applied the beam?

A (Junko Kazumi)

We used about 4–5 L for the digester. We would take subsamples of that for various analyses. I agree with you about these methods. As you know, sludges are really not that great to work with. We have had some difficulty with some of the methods we wanted to use.

Document Type: Research Article


Publication date: January 1, 2001

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