高浓度氨氮废水处理与氨资源化新技术  

New treatment technique for highly concentrated ammonia-nitrogen wastewater and ammonia recovery

作　　者：赵贤广[1] 李武[1] 王金龙[1] 李国平[2] 王小平[2] 徐炎华[1] 

机构地区：[1]南京工业大学环境学院,江苏省工业节水减排重点实验室,江苏南京210009 [2]江苏省环境科学研究院,江苏省环境工程重点实验室,江苏南京210036

出　　处：《工业水处理》2011年第12期31-34,共4页Industrial Water Treatment

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07101-003);江苏省环境工程重点实验室课题(KF2010006);南京工业大学学科基金课题(39727001)

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（3000～5000）：1降至（1000～2000）：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次吸收一解吸循环实验，氨吸收率均保持在99．9％以上，解吸率达91％以上。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 strip- ping 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 ＂H20. After the absorbent subjected to five times of absorption-desorption circulating experi- ments, the ammonia absorbing rate maintains at above 99.9% and the desorbing rate above 91%.

关 键 词：氨氮废水 吹脱法 吸收液 氨回收 再生 

分 类 号：X703.1[环境科学与工程—环境工程]