Here is the results of the 4th pass.
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Sludge is consistent with the other passes, in consistency, maybe slightly stiffer(holds form better). Each pass seems to have less water. 4th pass was 5.86oz. So still less then pass 3, but not by much. Entering the realm of diminishing returns. Setting up for a 5th pass. Same setting as all the other passes.
This batch was heavily thinned so I wouldn't need heat. But think I might want to try heat at the end to see what it does.
Questions I don't have the answers to yet.
-why is this sludge not coming out on the previous passes?
-is it because of different head pressure when the tote is full vs empty and the pump isn't pulling so hard? This causing a faster flow rate at the beginning and slower at the end? Causing contamination on the clean side(to fast flow rate)?
-am I still running the oil through to fast?
-am I getting the lighter(smaller) particles out now vs heavy on the first pass? Why wouldn't it pull all of them out at the same time?
-how many fuges would be needed to do one pass?
I have run this pump/fuges at full tilt (~20gph) in a continuous recirculating configuration and pull out gobs of sludge but "takes longer." Recirculating to the same container seems to work, but also seem to be mix and not always guaranty that 100% passes through the fuges. I am passing to a different container then source so 100% goes through the fuges.
Need to do some smaller batch that will finish faster and do several of the following.
-decrease the flow rate more
-run with heat
-graph and see how many more passes would get most of the sludge out. Figure out the point of diminishing returns.
-send sample to lab and see what particle size mix is left.