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Quentin, the system I described in my original post was installed last Spring except I used a teflon pipe to introduce nitric acid underneath the water in acid sewer sump instead of a mixing tee. We have an acid sewer system and alkaline sewer system and a fairly long run of pipe after they...

Does anyone know of a resource for locating a nitric acid enthalpy concentration chart?

Thanks for your advice. I was looking for a way to prevent fume generation in the local area from the acid addition. Do you have a feel for maximum nitric acid concentration to avoid fuming when diluted with water?

Does anyone have any experience using concentrated nitric acid for pH adjustment of effluent? We routinely use nitric acid for pressure filter acid cleaning and have a good storage tank and control system available. I am looking at a possible method of injecting 5-30 gpm of 65% nitric acid into...