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Design of Nitric Acid and Hydrofluoric Acid Mixture Acid Pickling Wastewater Treatment
Pickling wastewater is a liquid hazardous waste generated during the pickling process. In the pickling process, the metal surface is polluted and corroded by certain acids and salts. The polluted and corroded metal surface can be further damaged by salts, which can cause environmental pollution. Nitric acid and hydrofluoric acid are two common pickling agents that are released in manufacturing processes and contribute to the contamination of the environment. This paper will discuss the design of nitric acid and hydrofluoric acid mixture acid pickling wastewater treatment.
Pickling wastewater treatment is an important part of wastewater management. The various chemicals and metabolic products generated by pickling are discharged in the form of wastewater. This wastewater contains a variety of pollutant components, including metals, organic acids, inorganic acids, and salts. In order to reduce the pollution of pickling wastewater, the composition of the pollutants must be analyzed, and then a suitable treatment method must be applied.
For nitric acid and hydrofluoric acid mixture acid pickling wastewater treatment, the first step is to analyze the composition of pollutants. Depending on the amount of metals, organic acids, and inorganic acids in the wastewater, an appropriate wastewater treatment method should be selected. After the composition of pollutants is determined, the wastewater should be neutralized with alkaline agents, such as lime or sodium hydroxide, to neutralize the acids and reduce their concentration.
Following neutralization, the next step is to remove the metals and organic acids. This can be done through a combination of chemical oxidation and precipitation. Chemical oxidation can be achieved by adding oxidizing agents, such as chlorine, chlorine dioxide, and ozone, to the wastewater. The oxidation process will break down the organic acids and convert them into inorganic compounds that can then be removed from the wastewater through coagulation and sedimentation.
In addition to chemical oxidation, precipitation can also be used to remove the metals and organic acids from the wastewater. During precipitation, metallic hydroxides are formed through the reaction of metals and alkaline agents. The metallic hydroxides then settle out of the solution and can be removed from the wastewater.
Finally, the suspended solids in the wastewater should be removed by filtration or sedimentation. Filtration or sedimentation will allow for the removal of larger particles, such as sand and sludge, from the wastewater. After these treatment steps, the treated wastewater can be discharged according to environmental regulations.
In summary, the design of nitric acid and hydrofluoric acid mixture acid pickling wastewater treatment involves analysis of the composition of pollutants, neutralization of acids, chemical oxidation, precipitation, and filtration or sedimentation. This treatment process will reduce the pollution of pickling wastewater, thereby protecting the environment and ecosystems.
