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Anyone know where this Mercury is coming from ?
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<blockquote data-quote="Shadowrider" data-source="post: 3001972" data-attributes="member: 3099"><p>It's a bit more involved than a pH adjustment and adding iron. Hexavalent chromium is water soluble at all pH levels, that's what makes it so dangerous. I used to oversee this in an aerospace finishing shop. We used sodium metabisulphite and sulphuric acid for the conversion, lots of lime and sodium hydroxide to bring the pH level back to sane levels. To do the conversion you have to take the pH down below 2.2 or it doesn't work well. To remove it from water you have to convert it to trivalent chrome an then it will solidify and drop out. Remove the water from the solid sediment, pH adjust it and it's good to dump. Then you have to deal with the trivalent, but it's not anywhere near as nasty as hex we ran through a filter press and shipped it off to a certified landfill.</p><p></p><p>It can also be removed by vacuum distillation but the equipment is very expensive.</p></blockquote><p></p>
[QUOTE="Shadowrider, post: 3001972, member: 3099"] It's a bit more involved than a pH adjustment and adding iron. Hexavalent chromium is water soluble at all pH levels, that's what makes it so dangerous. I used to oversee this in an aerospace finishing shop. We used sodium metabisulphite and sulphuric acid for the conversion, lots of lime and sodium hydroxide to bring the pH level back to sane levels. To do the conversion you have to take the pH down below 2.2 or it doesn't work well. To remove it from water you have to convert it to trivalent chrome an then it will solidify and drop out. Remove the water from the solid sediment, pH adjust it and it's good to dump. Then you have to deal with the trivalent, but it's not anywhere near as nasty as hex we ran through a filter press and shipped it off to a certified landfill. It can also be removed by vacuum distillation but the equipment is very expensive. [/QUOTE]
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