Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgSat, 22 Nov 2008 10:13:06 GMT20http://www.wef.org/TechnicalDiscussions/Topic5303-17-1.aspxYou need to have a talk with the operators. Have any of them experienced a anerobic digester go off after sucking in O2 from neglect or????Thu, 01 Nov 2007 18:59:01 GMTDookiehttp://www.wef.org/TechnicalDiscussions/Topic5303-17-1.aspxSometimes you have to take Jerry with a grain of salt. He's always suspicious of anyone who has anaerobic digesters.Thu, 14 Jun 2007 13:55:27 GMTD Shulmisterhttp://www.wef.org/TechnicalDiscussions/Topic5303-17-1.aspxIt is not a sales pitch. Wed, 13 Jun 2007 18:35:27 GMT01617105http://www.wef.org/TechnicalDiscussions/Topic5303-17-1.aspxIt looks like a sales pitch.Sun, 03 Jun 2007 18:02:49 GMTJerryhttp://www.wef.org/TechnicalDiscussions/Topic5303-17-1.aspxThanks! I will try over there.</P><P>Charlie WFri, 01 Jun 2007 12:07:18 GMT01617105http://www.wef.org/TechnicalDiscussions/Topic5303-17-1.aspxYour message needs to be posted in "Biosolids and Solids"Wed, 30 May 2007 13:11:11 GMTD Shulmisterhttp://www.wef.org/TechnicalDiscussions/Topic5303-17-1.aspxFrom time to time anaerobic digesters with concrete roofs build up pressure and the roof is damaged when the pressure is relieved. Our digesters have two 6 inch pressure-vacuum relief valves on them. Sometimes operators overfill the digesters and plug up the flame traps under the relief valves. This allows pressure to build up cracking the roofs, blowing off access covers and lifting the roof to allow sludge to escape between the wall and the roof.</P><P>Groth and Varec make a 24" hinged manway that is weighted so it lifts and releases the sludge or gas that is pushing on it. It is called an emergency Pressure Relief Valve. I know a 24" opening will not plug.</P><P>Is anyone using these on concrete anaerobic digester roofs?Tue, 29 May 2007 12:26:51 GMT01617105