Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgFri, 10 Oct 2008 20:26:21 GMT20http://www.wef.org/TechnicalDiscussions/Topic8376-9-1.aspxRob,</P><P>There is much variation between plants in terms of influent COD/BOD and a lot depends on your climate , the amount of industry and domestic load , whether you have infiltration problems etc. A BNR process can be used over a wide range of COD/BOD but the influent strength will also dictate certain treatment processes and to what your effluent limits might be. </P><P>I don't know that you could really say there was any typical values but BNR processes are being used with influent CODs from perhaps as low as 150mg/l to over 1000 mg/l.</P><P>Plants treating largely domestic loads are probably in the range of 300-500mg/l COD provided there is not too much infiltration with BODs generally about 40% of the COD unless collection system detention time is really long.</P><P>Regards</P><P>TerryFSat, 16 Feb 2008 04:55:21 GMTTerryFhttp://www.wef.org/TechnicalDiscussions/Topic8376-9-1.aspxInfluent CODFri, 15 Feb 2008 12:42:00 GMTrobhttp://www.wef.org/TechnicalDiscussions/Topic8376-9-1.aspxRob,</P><P>Are you referring to influent or effluent.</P><P>Regards</P><P>TerryFThu, 14 Feb 2008 16:24:30 GMTTerryFhttp://www.wef.org/TechnicalDiscussions/Topic8376-9-1.aspxI work at a 2 mgd plant with a 5 stage BNR. I was wondering what a typical COD/BOD concentration is for your plant. I am trying to do some comparisons of other plants.Thu, 14 Feb 2008 13:17:47 GMTrob