Nitroguanidine Wastewater Pollution Control Technology: Phase III. Treatment with Ultraviolet Radiation, Ozone, and Hydrogen Peroxide

Nitroguanidine in aqueous solution was degraded by ultraviolet radiation. Neither hydrogen peroxide nor ozone was capable of degrading nitroguanidine. The use of hydrogen peroxide or ozone in conjunction with ultraviolet light did not increase the rate of nitroguanidine destruction or the apparent distribution of identifiable products. Guanidine was stable throughout all tests using ozone, hydrogen peroxide, and ultraviolet radiation. Nitroguanidine (100 mg/L) was undetectable after 100 minutes of exposure to ultraviolet radiation. When the initial nitroguanidine concentration was 20 mg/ L, only 30 minutes were required to reduce the nitroguanidine to less than 0.10 mg/L. Nitroguanidine degradation by ultraviolet light was independent of pH between the values of 3 and 11. Guanidine formation during the photolysis of nitroguanidine was pH dependent. Guanidine formation increased as the pH decreased.