Treatment of wastewater containing nitric acid
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Seeking help for nitric acid wastewater treatment: Conditions: Treatment of nitric acid wastewater, with a treatment capacity of 10 tons per day; the nitric acid concentration is around 10%. It is necessary to recover 10% of the nitric acid present in the wastewater and concentrate it to 40%~45% for use as a by-product, including the absorption of nitrogen oxides from the exhaust gases； I would like to ask the experts: What is the process for nitric acid absorption? Has anyone carried this out before? Could you provide some process flow diagrams, lists of equipment, or something similar for reference?
Are you a manufacturer of nitric acid? The dilute nitric acid produced by normal nitric acid manufacturing plants (also known as wastewater) is mixed with process water or used directly in the absorption of nitrogen oxides to produce dilute nitric acid at 40%-58% concentration; this dilute nitric acid is then concentrated into 98% concentrated nitric acid. The nitrogen oxide emissions are treated using an ammonia oxidation process to ensure they are discharged in compliance with regulations. If you are a company that uses nitric acid, for the approximately 10% dilute nitric acid produced, one option is to carry out conventional concentration processes, while another option is to use this dilute nitric acid directly to absorb nitrogen oxide gases in order to produce dilute nitric acid with a concentration of 35-40% (under certain pressures) ； Of course, for the treatment of pure nitrogen oxide gases, ammonia oxidation can be used, as well as alkaline absorption; urea absorption is also an option (it depends mainly on the volume of gas to be treated, the budget for treatment costs, and environmental regulations)
I agree with the suggestions from users above; especially for those using nitric acid, the concentration and recovery of dilute acid is crucial. It involves not only investment in technology and equipment but also costs related to management and environmental protection, with many factors that need to be taken into consideration. Urea is the best choice for absorbing exhaust gases, as it is highly efficient.