环境保护科学2025，Vol.51Issue(5)：82-89,8.DOI:10.16803/j.cnki.issn.1004-6216.202410037
磷酸氨镁沉淀法回收新型碳材料生产废水中的氨氮
Recovery of ammonia nitrogen from wastewater of new carbon material production by magnesium ammonium phosphate precipitation method
摘要
Abstract
Magnesium ammonium phosphate(MAP)precipitation method was adopted to conduct a study on the removal of ammonium nitrogen(NH4+-N)from wastewater produced in the production of new carbon materials.The effects of initial pH of wastewater,phosphorus-to-nitrogen molar ratio,and magnesium-to-nitrogen molar ratio on the ammonium nitrogen removal rate in wastewater were investigated.Response surface methodology was used to optimize the process parameters,and the denitrification process and mechanism of MAP precipitation were analyzed via thermodynamic calculation,XRD,and SEM.It was shown by the response surface fitting results that the order of influence of each factor on the ammonium nitrogen removal rate was as follows:dosage of NaOH(pH)＞n(PO43-)/n(NH4+)＞n((Mg2+)/n(NH4).The optimized process parameters were as follows:at a temperature of 25℃,with an initial ammonium nitrogen concentration of 1498 mol/L,pH=9.9,n(PO43-)/n(NH4+)=1.27∶1,and n(Mg2+)/n(NH4+)=1.25∶1,the ammonium nitrogen removal rate in wastewater reached 92.09％.The thermodynamic calculation results indicated that the Mg2+-PO43--NH4+-H2O system optimized by response surface methodology was the optimal process parameter for denitrification;XRD and SEM indicated that the precipitation product was mainly MgNH4PO4·H2O solid,with a rough surface and irregular rod-shaped structure.关键词
磷酸氨镁(MAP)沉淀法/响应曲面/热力学计算/氨氮/脱氮机理Key words
magnesium ammonium phosphate(MAP)precipitation method/response surface/thermodynamic calculation/ammonia nitrogen/denitrification mechanism分类
环境科学引用本文复制引用
朱峥嵘,吴艳,肖继波,颜智勇,王艳姣,万均,湛昭哲..磷酸氨镁沉淀法回收新型碳材料生产废水中的氨氮[J].环境保护科学,2025,51(5):82-89,8.基金项目
湖南省自然科学基金(2022JJ6057) （2022JJ6057）
