摘要：

针对工业上高浓度氨氮废水吹脱法处理存在的缺点,改进了传统吹脱塔内部结构,并采用高效填料。在温度40℃,pH≈11条件下,气液比由(3 000~5 000)∶1降至(1 000~2 000)∶1,氨氮吹脱率提高至95%以上。新型可再生氨吸收液对吹脱尾气中氨气的吸收率可达99.9%,饱和吸收液再生率达91%以上,释放的氨气经两级冷凝吸收后可获得10%~20%的氨水。氨吸收液经5次吸收-解吸循环实验,氨吸收率均保持在99.9%以上,解吸率达91%以上。

关键词: 氨氮废水, 吹脱法, 吸收液, 氨回收, 再生

Abstract:

Aiming at the disadvantages of the treatment technique of highly concentrated ammonia-nitrogen wastewater by air stripping method applied to industry,the inner structure of traditional air stripping tower has been improved,and a highly efficient packing has been used.Under the conditions of 40 ℃ and pH≈11,the gas liquid ratio is evidently decreased from(3 000-5 000)∶1 to(1 000-2 000)∶1,and the ammonia-nitrogen air stripping rate increases to above 95%.A novel recycled ammonia absorbent can improve the absorbing rate of NH3 in the air stripping tail gas as high as above 99.9%,and the regenerating rate of ammonia is above 91%.Meanwhile the ammonia gas released from the absorbent regeneration process subjected to the two-stage condensation absorption can get 10%-20% of NH₃·H₂O.After the absorbent subjected to five times of absorption-desorption circulating experiments,the ammonia absorbing rate maintains at above 99.9% and the desorbing rate above 91%.

Key words: ammonia-nitrogen wastewater, air stripping method, absorbent, ammonia recovery, regeneration

中图分类号: 

• X703.1