Abstract
Several physical, chemical, and biological technologies efficiently treat ammonia nitrogen (NH3-N). However, cold temperatures and mixes of contaminants limit NH3-N removal efficiency. This study evaluated the ozone microbubbles efficiency for NH3-N removal from synthetic and five actual mine effluents. Testing was initially conducted in batch mode. Then, to confirm treatment feasibility, tests with continuous flow were performed with one synthetic and one real effluent. Results showed that the parameters of the water to be treated have significant influence on treatment efficiency. The presence of cyanides, cyanate, thiocyanate, and metals adversely influenced treatment performance. The NH3-N removal efficiency ranged from 27.8 to 99.3%. Continuous flow testing confirmed the feasibility of large-scale treatment as 99.1% of NH3-N was treated at a flow rate of 1.1 L/min over a treatment period of 570 min. Final polishing steps removed the pink color from the water after ozone microbubbles treatment, resulting in satisfactory quality of treated water.
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