新型旋转填料床吹脱氨氮废水的实验研究

Stripping ammonia nitrogen wastewater in a novel rotating packed bed

转子结构为相互嵌套的填料环的新型旋转填料床是基于强化气膜控制传质过程的新型高效传质设备。以空气作为气提剂,在新型旋转填料床中对氨氮废水进行吹脱实验研究,考察了吹脱过程中气液比、pH值、超重力因子、循环次数等因素对氨氮脱除率的影响。实验结果表明:在温度10℃,气液比1000,pH值为11.0,超重力因子为67的实验条件下,单级氨氮脱除率为43.87%,而经过4次循环吹脱后,氨氮脱除率达到80.2%,经过8次循环吹脱后,氨氮脱除率达到90.1%。通过对比分析,在相近的操作条件下,新型旋转填料床的氨氮脱除率明显高于文献错流旋转填料床,表明新型旋转填料床能有效地强化气膜控制的传质过程。

The rotor structure of the novel rotating packed bed （RPB） is nested packing rings, which is a new efficient apparatus for intensifying the gas-side mass transfer resistance controlled process. Ammonia-nitrogen wastewater was stripped by air in the novel RPB, and the effect of gas-liquid ratio, pH value, high-gravity factor and the number of cycles on were studied experimentally. The results showed that the single-stage removal rate of ammonia-nitrogen was 43.87% under following operational conditions：temperature of 10℃, gas-liquid ratio of 1000, pH value of 11.0, high-gravity factor of 67, and the removal rate of ammonia-nitrogen could reach 80.2%and 90.1%, respectively, after 4 and 8 cycles. The removal rate of ammonia-nitrogen in the novel RPB was much higher compared with that of the cross-flow RPB, which indicated that the novel RPB could intensify effectively the gas-side mass transfer resistance controlled process.