Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgTue, 07 Oct 2008 14:05:32 GMT20http://www.wef.org/TechnicalDiscussions/Topic9028-14-1.aspxWould it be possible to "solidify" the waste with Portland cement? Perhaps some kind of product could be made with the solidified molybdenum-rich concrete. Building block, statuary, paving blocks, etc?Thu, 01 May 2008 13:19:07 GMTJeff Naumannhttp://www.wef.org/TechnicalDiscussions/Topic9028-14-1.aspxI heard about some problems related to the presence of molybdenum in wastewater... but my situation is different. I try to explain:<P>exhaust pickling bath for stainless steel --&gt; neutralization with Ca(OH)2 to precipitate metals as hydroxides. The pH for precipitation is high (9-10) and molybdenum is (or transform) in molybdate form and doesn't precipitate. The mud produced in this way is filter pressed and sent to the rubbish dump. Italian law imposes limits on water leachability of Mo in mud (1 ppm with solid/water ratio = 1:10). Our molybdate, that is "blocked" in the mud, is soluble and its leachability is high... The disposal becomes expensive$$$$$... I'd like to succeed in the "inertization" of the molybdate so that it remains in the mud...</P><P>Anyone with the same problem?Wed, 30 Apr 2008 09:04:22 GMTSimona