Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgSun, 07 Sep 2008 06:59:47 GMT20http://www.wef.org/TechnicalDiscussions/Topic8841-10-1.aspxIt sounds like biological foaming caused by either nocardioform organisms or Microthrix parvicella. I say this because of your descriptions of its properties and because of the fact that you are able to get 5%TS by DAF thickening without using any polymer. Both of these microorganisms are highly hydrophobic and act as flotation aids for the WAS especially when using DAFs. I would be happy to look at the sludge for you if you want to contact me.</P><P>David JenkinsSun, 13 Apr 2008 20:45:56 GMTd jenkinshttp://www.wef.org/TechnicalDiscussions/Topic8841-10-1.aspxI would have it analyzed under a microscope by someone who's has the expertise. Maybe a local College Chemistry or Biology professor can help. Look at your industries to see what products they handle. Thu, 10 Apr 2008 10:17:24 GMTJerryhttp://www.wef.org/TechnicalDiscussions/Topic8841-10-1.aspxI forgot to mention we are using disolved air flotation and not using any polymer presently. The sludge is thickening to 5% without the use of polymer. That being said the consistensy was compared to polymer, still no word on whether we can use the slime in dewatering.Wed, 09 Apr 2008 12:03:06 GMTPellethttp://www.wef.org/TechnicalDiscussions/Topic8841-10-1.aspxCould be your polymer.Wed, 09 Apr 2008 10:27:58 GMTJerryhttp://www.wef.org/TechnicalDiscussions/Topic8841-10-1.aspxIt smells like anaerobic sludge, sticks to itself, acts as a surfactant, and leads to a phenominal surface foaming. It is has weird dewatering characteristics. Even after it is dewatered to 24% it shakes like jello. The digesters are running at 95F give or take about a half a degree.Wed, 09 Apr 2008 07:51:02 GMTPellethttp://www.wef.org/TechnicalDiscussions/Topic8841-10-1.aspxPellet:</P><P>Are you talking about a slime that adheres to itself? Sort of snot, taffy consistency thick gooey? Is it colored or transparent, smelly? Need to describe it a bit more in detail. What is the temperature of the anaerobic digester?Tue, 08 Apr 2008 16:38:54 GMTVictorhttp://www.wef.org/TechnicalDiscussions/Topic8841-10-1.aspxAnybody ever hear of Slime being generated in anaerobic digesters?Tue, 08 Apr 2008 15:58:19 GMTPellet