Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgTue, 14 Oct 2008 12:17:06 GMT20http://www.wef.org/TechnicalDiscussions/Topic8819-10-1.aspxI am a little puzzled. I don't know what you mean when you refer to a single stage centrifuge. In general, if a centrifuge is doing poorly for mechanical reasons, it also runs very rough. If it is running smoothly, it's almost always a problem with the ancillary equipment and processes.<br><br>The polymer system can screw up, inadequate aging time, the sludge/polymer reaction is very poor. <br>Do a jar test to compare a polymer solution made in the lab, with a fresh grab sample from the plant make down unit. If they perform the same, the make down unit is fine. <br><br>Often the sludge has changed, and it is possible the polymer is not what you think it is. It is hard to know which, unless you have a reference sample of the polymer, taken during the polymer evaluation trials. <br><br>Peter LaMontagne 215 348 7879<br>Peter@thecentrifugeguys.comMon, 28 Apr 2008 16:15:18 GMTPeter LaMontagnehttp://www.wef.org/TechnicalDiscussions/Topic8819-10-1.aspxIs it performing below the startup performance test levels? I would call in the manufacturer to optimize and also test different polymers. Mon, 07 Apr 2008 12:12:44 GMTRob Baurhttp://www.wef.org/TechnicalDiscussions/Topic8819-10-1.aspxWe seem to be having problems with our single stage centrifuge we can't seem to get a good quality dry bio- sludge i've tried adding clay and lime at different times with little results i've also adjusted the plate dams with no luck any suggestions would.be appreciated thanks. andyFri, 04 Apr 2008 04:05:32 GMTandy940_00