Removal of Ammonia and Organic Pollutants from Saline Chemical Wastewater by Ionizing Radiation : Performance, Mechanism and Toxicity

In this study, the removal of ammonia and phenol in saline chemical wastewater by radiation was investigated in detail. The results showed that chloridion in saline chemical wastewater could be transferred to •Cl and •ClO by radiation, which promoted ammonia oxidation, but inhibited phenol degradation. Solution pH affected the types of reactive species, which further affected the removal of ammonia and phenol. When ammonia and phenol co-existed in saline chemical wastewater, the removal efficiency of ammonia was depressed compared to that in the absence of phenol. Similarly, the phenol removal efficiency was also depressed in the presence of ammonia when the solution pH was lower than 7.0. Interestingly, the phenol removal efficiency was improved with increase of either chloridion concentration (2~8 g/L) or dose (2~5 kGy), which was attributed to the formation of intermediate nitrogen-centered radicals that can react with phenol. In addition, degradation products of phenol under different conditions were identified. The acute toxicity of saline chemical wastewater after radiation treatment under different conditions was also evaluated. The results of this study could provide an insight into the removal of ammonia and phenol in chemical saline wastewater by radiation technology