Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgTue, 07 Oct 2008 00:03:26 GMT20http://www.wef.org/TechnicalDiscussions/Topic8756-14-1.aspxMuch more information will be needed to properly answer your questions (What are the flows and concentrations? What type of biological system is it? Is the EQ tank mixed and/or aerated? N &amp; P both available?) but if you have trouble with both all and nothing why don't you operate the EQ tank at 1/3 full. This will mitigate some of the problem until you discover and fix the root cause issue. Thu, 27 Mar 2008 13:05:14 GMTBill Gaineshttp://www.wef.org/TechnicalDiscussions/Topic8756-14-1.aspxWe are trying to startup an equalization to dampen the variations coming from the plant, however, it seems that we only can work on the "lean" side or the "rich" side only of the food to the biological mass, so we go from having too high CBOD to having NH3 rising due to starvation (we assume). </P><P>We measure flow and TOC (also NH3 but this is never an issue in the eq basin) from the eq going to the aeration basin and TSS and NH3 inside the aeration basin, but it seems that we are always behind in our decisions. </P><P>Many times we have to bypass the equalization to try to "reactivate" the biological mass faster, and that's when the risk of shocks to the biomass becomes higher, and if they do happen is 2 months to recover.. </P><P>Anybody could help with this problem? What we should be measuring, or trying to control to ensure that the biomass is being fed at the adequate rate and how could be have better information about potential upsets on the Food to Mass load?</P><P> Any suggestions will be highly appreciated.Thu, 27 Mar 2008 11:14:29 GMT01802249