Ozturk Emrah, Bal Nazire
Dept. of Environmental Engineering, Suleyman Demirel University, 32260 Isparta, Turkey.
Dept. of Environmental Engineering, Pamukkale University, 20070 Denizli, Turkey.
Ultrason Sonochem. 2015 Sep;26:422-427. doi: 10.1016/j.ultsonch.2015.02.012. Epub 2015 Mar 4.
In this study, mechanisms and efficiency of ammonia-nitrogen removal from aqueous solutions by ultrasonic irradiation were investigated. Depending on the factors affecting the sonication (initial concentration, initial pH, ultrasonic power density and sonication period), sonication tests were carried out and ammonium-nitrogen removal efficiency by ultrasonic irradiation was determined. In these experiments, ammonia-nitrogen removal efficiency was achieved in the range of 8-64%. In short sonication periods, the best ammonia-nitrogen removal efficiency was achieved at pH 8.2-11. Lower ammonia-nitrogen removal efficiency was observed in high initial ammonia-nitrogen concentration of solutions. It was observed that high initial ammonia-nitrogen concentrations may led to decreased ammonia-nitrogen removal efficiency however quantity of ammonia-nitrogen removal was higher. Because high initial concentration had a negative impact on the sonochemical reactions the heat of cavitation bubbles was reduced. Ammonia-nitrogen removal efficiency was increased with ultrasonic density and sonication period. This study showed that effective ammonia-nitrogen removal could be achieved by the ultrasonic irradiation in short sonication periods (as 60-600 s). Specific cost of ammonia-nitrogen removal by the ultrasonic irradiation from simulated ground water, surface water, wastewater and landfill leachate was also calculated. The specific removal cost was varied between 0.01 and 0.25$/g ammonia-nitrogen.
本研究考察了超声辐照从水溶液中去除氨氮的机制和效率。根据影响超声处理的因素（初始浓度、初始pH值、超声功率密度和超声处理时间）进行超声处理试验，并测定超声辐照对铵氮的去除效率。在这些实验中，氨氮去除效率在8% - 64%范围内。在短时间超声处理中，pH值为8.2 - 11时氨氮去除效率最佳。溶液初始氨氮浓度较高时，氨氮去除效率较低。据观察，初始氨氮浓度较高可能导致氨氮去除效率降低，但氨氮去除量较高。因为高初始浓度对声化学反应有负面影响，空化气泡的热量减少。氨氮去除效率随超声密度和超声处理时间的增加而提高。本研究表明，在短时间超声处理（如60 - 600 s）内，超声辐照可有效去除氨氮。还计算了超声辐照从模拟地下水、地表水、废水和垃圾渗滤液中去除氨氮的单位成本。单位去除成本在0.01 - 0.25美元/克氨氮之间。
