水力喷射空气旋流分离器脱氨

空气吹脱被广泛用于从废水中脱氨，但其过程效率有待提高。为了提高过程效率，提出了一种新型气-液吹脱设备——水力喷射空气旋流分离器（WSA），并以废水中氨的吹脱进行了实验。与传统的吹脱设备相比，WSA表现出较好的气-液传质性能，使氨的吹脱效率大大提高。在氨的吹脱过程中，液相温度和空气流量是影响吹脱过程中氨体积传质系数的主要因素。空气流量对于体积传质系数存在一个临界值，超过此值时，体积传质系数随空气流量增加而迅速增大。液相中存在的固体颗粒物对于吹脱过程的传质几乎没有影响。在该设备中没有填料，不存在堵塞问题，因而可以进行较长时间的分离操作。

Water-sparged aerocyclone separator for ammonia removal from wastewater

Air stripping is widely used in the removal of ammonia from wastewater, but it is a time consuming process.In order to improve the efficiency of this process, air stripping of ammonia from water was performed in batch mode in a newly designed gas-liquid contactor—water-sparged aerocyclone (WSA).The effect of main process parameters on ammonia removal and mass transfer coefficient was investigated.WSA exhibited excellent mass transfer coefficient compared with traditional stripping tanks and packed towers.Of all the process parameters, liquid phase temperature and air flow rate were the main factors affecting the mass transfer coefficient.There was a critical value of air flow rate beyond which the mass transfer coefficient increased rapidly.Air flow rate and temperature of liquid phase were the most important factors affecting the air stripping rate of ammonia.Solid particles present in aqueous phase had little effect on the mass transfer coefficient.The air stripping process could be operated continuously for a longer time because there was no particle deposition commonly occurring in packed towers.