I have a pickling tank made of solution annealed 304L SS and contains a solution of 25-38% nitric acid and 3% hydrofluoric acid. Acid temp can be up to 95 deg F. One panel of the tank started showing leopard spots 2-3" in diameter after 2 years of service with severe corrosion. The other two...
I have a waste stream containing 400ppm NO3 from rinse tanks in a nitric acid pickling facility. A contractor has suggested using calcium polysulfide to remove nitrates before sending the water to a collection area for pH adjustment which will then go to the POTW for disposal. Is this a common...
I need to remove 500-1000ppm Fluoride from a waste stream with a flowrate of 50,000gpd down to 4.5ppm, pH is 2. One suggestion was lime or RO. Are these the best options which will have minimal waste to dispose of?
