基于热力学分析的MAP法处理模拟氮磷废水研究  

Research on simulated nitrogen and phosphorus wastewater with the magnesium ammonium phosphate process based on thermodynamic analysis

作　　者：米海蓉[1] 成功[1] 李士松[1] 刘桂芳[1] 丁学姣 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2016年第11期1514-1519,共6页Journal of Harbin Engineering University

基　　金：中央高校基本科研业务费项目(HEUCFZ1124);城市水资源与水环境国家重点实验室开放研究项目(ESK201021)

摘　　要：磷酸氨镁(MAP)法处理氮磷废水过程中,NH_4^+-N和PO_4^(3-)-P的去除率无法反映影响MAP法的因素及沉淀物的生成过程。为解决此问题通过单因素实验以及热力学平衡计算的方法,对MAP法处理模拟氮磷废水中的氨氮和磷酸盐的影响因素进行了分析和探讨。研究了初始氨氮浓度、p H值、摩尔比n(Mg)∶n(N)以及摩尔比n(P)∶n(N)条件,对NH_4^+-N和PO_4^(3-)-P去除率的影响以及不同条件各沉淀组分的变化。结果表明,在p H值为9~9.5,摩尔比n(Mg)∶n(N)∶n(P)为1∶1∶1条件下,MAP法的处理效果最优,NH_4^+-N去除率可达79.35%~93.76%,PO_4^(3-)-P去除率可达86.76%~95.43%,且MAP沉淀物中杂质较少;虽然增大摩尔比n(Mg)∶n(N)或摩尔比n(P)∶n(N)会分别提高PO_4^(3-)-P和NH_4^+-N去除率,但也会分别使NH_4^+-N和PO_4^(3-)-P残余量增大。In the nitrogen and phosphorus wastewater treatment with magnesium ammonium phosphate （ MAP ） process, the removal rate of NH4^＋-N and PO4^3--P cannot reflect the influencing factors of the MAP process or the sediment generation process. To solve this problem, this paper analyzes the influential factors of ammonia nitrogen and phosphate in the nitrogen and phosphorus wastewater using a single factor experiment and the method of ther-modynamic equilibrium calculation. The variance of ammonia nitrogen and phosphate removal are analyzed together with precipitation generation at different pH values using the mole ratios of n（Mg） ∶ n（N） and n（P） ∶ n（N）. Results demonstrate that the optimal operating condition for the MAP process is at a pH in the range of 9-9.5 and at a Mg ∶ N ∶ P molar ratio of 1 ∶ 1 ∶ 1. Under these conditions, the removal rate of NH4^＋-N and PO4^3--P are 79.35%-93.76% and 86.76%-95.43%, respectively, thereby delivering the highest purity of MAP. Increasing the molar ratio n（Mg） ∶ n（N） or n（P） ∶ n（N） improves the removal rate of PO4^3--P and NH4^＋-N, respectively, but also results in greater amounts of remaining NH4^＋-N and PO4^3--P, respectively.

关 键 词：磷酸氨镁 氮磷废水 热力学平衡 影响因素 摩尔比 去除率 

分 类 号：X703.1[环境科学与工程—环境工程]