磷酸铵镁的超声/吹脱协同分解及循环利用研究  

Decomposition of Magnesium Ammonium Phosphate by Combination of Ultrasound and Air-stripping and Its Recycling

作　　者：吴成强[1] 陈越平[1] 张爱国[1] 吕文洲[2] 池焕明 张捷 

机构地区：[1]浙江工业大学环境学院,浙江杭州310032 [2]宁波大学建筑工程与环境学院,浙江宁波315211 [3]绍兴市曹娥江引水工程管理处,浙江绍兴312050

出　　处：《中国给水排水》2017年第3期58-61,共4页China Water & Wastewater

基　　金：北京市科技计划项目(Z151100001415008);浙江工业大学"环境科学与工程重中之重学科"2013年开放基金资助项目(ESE20130105)

摘　　要：采用超声/吹脱协同分解磷酸铵镁(MAP),并将其循环利用处理模拟含氨废水,初步探讨了MAP分解反应条件及其循环利用效率。试验结果表明,超声/吹脱能够协同分解MAP,对MAP混合液中氨氮的去除率高达96.24%。在MAP分解过程中,氨氮易从固相转移到液相,而再从液相转移到气相是整个分解过程的关键步骤。MAP经超声/吹脱协同分解后可以循环利用7次以上,但随着循环次数的增加,MAP循环利用效率降低,其中Mg_3(PO_4)_2·8H_2O无法充分参与反应是循环利用效率降低的主要原因。Magnesium ammonium phosphate （MAP） was decomposed by the combination of ultrasound and air-stripping and reused to treat wastewater containing ammonia nitrogen. Reaction conditions of MAP decomposition and its recycling rate were discussed. The results showed that ultrasound and air- stripping presented synergistic effect, and the removal rate of ammonia nitrogen in MAP mixture achieved 96.24%. The ammonia nitrogen in MAP could easily be transferred from solid phase to liquid phase and it is a critical step for it to transfer to gas phase. MAP was decomposed and recycled at least for 7 times. However, the recycling rate of MAP decreased with the increase of recycling times, which was mainly owing to the incomplete reaction of Mg3 （ PO4 ） 2 · 8H2O.

关 键 词：磷酸铵镁 超声波 吹脱 循环利用 含氨废水 

分 类 号：X703[环境科学与工程—环境工程]