Degradation kinetics of ammonia nitrogen in aqueous solution by ozonation treatment under different parameter conditions

Abstract

The efficiency of the ozonation treatment as degradation for ammonia nitrogen in freshwater fishpond was investigated. The ammoniacal nitrogen (NH4-N) from synthetic wastewater and actual aquaculture wastewater from Nile tilapia fishpond were performed ozonation treatment at different parameter effects. The effect of ozone concentration (1.0 - 2.0 mg/L) and initial pH (2 - 12) on ammonia nitrogen were studied through the semi-batch ozonation treatment for 4 hours at ambient temperature. The highest removal in ammoniacal nitrogen was pH 10 (32% reduction) at 2.0 mg/L of ozone concentration. The highest removal of ammonia nitrogen in aquaculture wastewater was 42% at pH 12 and ozone concentration at 2.0 mg/L. These findings indicate that the ozonation treatment might be utilised to eliminate ammonia nitrogen from aquaculture wastewater and boost the biodegradability of refractory organic compounds.