Abstract
This study analyzed the influence of different ammonia stripping parameters on ammonia removal efficiency and mass transfer rate. Ammonia stripping was performed on two devices, a column and a packed tower, with artificial ammonium hydroxide wastewater. First, ammonia concentration and pH were varied in a column without liquid circulation. At the same pH, the removal efficiency and mass transfer rate were constant, irrespective of initial ammonia concentration. When pH was increased, the ammonia fraction also increased, resulting in higher removal efficiency and mass transfer rate. Second, the effects of stripping were assessed using a packed tower with fluid circulation. The ammonium hydroxide concentration did not affect the removal efficiency or mass transfer rate. Furthermore, at apparatus liquid-gas ratios of 26.8–107.2 L/m3, a lower liquid-gas ratio led to increased ammonia removal efficiency and mass transfer rate. Conversely, the lower the liquid-gas ratio, the greater the air consumption. In conclusion, considering the removal rate and volume of air supply, the range of optimal liquid-gas ratio was determined as 26.8–53.6 L/m3. In particular, the 26.8 L/m3 condition achieved the best ammonia removal rate of 63.0% through only 6 h of stripping at 70 °C and pH 8.5.
Highlights
With industrial development and population growth, there has been a rapid increase in the amount of wastewater containing ammonia from various sources, including sewage sludge, cattle excrement, food waste, and biomass [1]
Ammonia stripping is a efficient method for ammonia recovery from high concentration wastewater [6,7], In ammonia stripping system, ammoniacal nitrogen is removed as a gas by supplying gas such as air or steam [6,7,8,9]
The stripping efficiency and mass transfer rate of ammonia were analyzed according to initial concentration and pH
Summary
With industrial development and population growth, there has been a rapid increase in the amount of wastewater containing ammonia from various sources, including sewage sludge, cattle excrement, food waste, and biomass [1]. There are various methods for removing ammoniacal nitrogen from solution, including physical, electronic, and biological methods. Ammonia stripping is a efficient method for ammonia recovery from high concentration wastewater [6,7], In ammonia stripping system, ammoniacal nitrogen is removed as a gas by supplying gas such as air or steam [6,7,8,9]. In tower-type reactors, ammonia mass transfer is achieved by gas-liquid contact within the packing material [10]. The liquid-gas ratio should be carefully considered to optimize the operating conditions of packed towers
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
