Study on salt effect of NaCl in cyanuric acid wastewater treatment.

The pollution of cyanuric acid-contaminated saline wastewater has been a major problem in industrial wastewater treatment in the production of trichloroisocyanuric acid. In this study, the solubility of cyanuric acid in different concentrations of NaCl solution was studied via data fitting and salt effect theory, and a mathematical model was established to analyze the salt effect of NaCl on cyanuric acid wastewater and to predict the solubility of cyanuric acid in different NaCl solution at even lower temperatures. After the experimental verification, the deviation between the data fitting results and the experimental results were analyzed. The optimum salting-out effect of NaCl on cyanuric acid was selected and the fitting equation was modified. It was found that the optimum precipitation point of cyanuric acid is that NaCl was added to the mass concentration of 25%, and the solution temperature was adjusted to 0°C, which caused the concentration of cyanuric acid in the simulated wastewater solution was dropped from 1400 mg/L to 744 mg/L. [ABSTRACT FROM AUTHOR]