污染控制技术原理与工艺
王建森,宋永会,袁鹏,袁芳,彭剑峰.基于PHREEQC程序的磷酸铵镁结晶法污水处理工艺模型化研究[J].环境科学学报,2006,26(2):208-213
基于PHREEQC程序的磷酸铵镁结晶法污水处理工艺模型化研究
- Modeling studies of the crystallization process of magnesium ammonium phosphate for wastewater treatment based on the PHREEQC Program
- 基金项目：中国环境科学研究院科技创新项目(No.2004-021);国家人事部留学人员科技择优项目(No.2004-99);国家人事部高层次留学人才项目(No.2004-2005)
- 作者
- 单位
- 王建森
- 1. 河北邯郸学院化学系, 邯郸 056005; 2. 中国环境科学研究院水污染控制工程研究室, 北京 100012
- 宋永会
- 中国环境科学研究院水污染控制工程研究室, 北京 100012
- 袁鹏
- 中国环境科学研究院水污染控制工程研究室, 北京 100012
- 袁芳
- 中国环境科学研究院水污染控制工程研究室, 北京 100012
- 彭剑峰
- 中国环境科学研究院水污染控制工程研究室, 北京 100012
- 摘要：为揭示溶液物化参数对磷酸铵镁结晶工艺回收氮、磷的影响,利用地球化学水质模型程序PHREEQC 2.11计算了涵盖实际工况条件下可能存在的溶液体系的磷酸铵镁饱和度指数,对溶液组分的浓度效应进行了模型化热力学评估.模拟溶液体系含磷10～00 mg·L-1、镁24～720 mg·L-1,其氨氮与磷的摩尔比为1～40,温度为25℃,pH值为6.0～12.0.计算结果表明,磷酸铵镁的饱和度指数与氮、磷、镁的质量浓度分别呈对数函数关系,并随任何一个因子的增大而增大;与溶液pH值呈多项式函数关系,结晶反应的最佳pH值为9.0,并随溶液中氨氮与磷摩尔比的增大而略升;此外,磷酸铵镁的饱和度指数与溶液离子强度呈幂函数关系,随离子强度的增大而减小.适当调节溶液的镁盐浓度和控制溶液pH值,是调控磷酸铵镁结晶反应,实现氮、磷回收的2种主要手段.
- Abstract：To understand the effects of solution conditions on the crystallization process of magnesium ammonium phosphate (MAP) for nitrogen (N) and phosphorus (P) recovery, the saturation indices (SIs) of MAP of the solution systems that covered the possible operational conditions were calculated by using a geochemical aqueous model program, PHREEQC 2.11, and the effects of the composition concentrations were evaluated thermodynamically by modeling method. The simulated solution systems contained 10～600 mg·L-1 P, 24～720 mg·L-1 magnesium (Mg); the molar ratios of ammonium N to P, N/P were 1～40, the temperature was 25 ℃ and the pH values were 6.0～12.0. The results show that the SI value of MAP is the logarithmic function of the mass concentration of P, of ammonium N and of Mg, respectively, and increases with the increase of the mass concentration of each element. The SI value of MAP is a polynomial function of the solution pH value, and the optimum pH value for the crystallization of MAP is 9.0 and increases slightly with the increase of N/P. Moreover, the SI value of MAP is a power law function of the solution ionic strength but decreases with its increase. Proper adjustment of the Mg concentration and the control of solution pH value are two effective methods for the control of the crystallization of MAP for N and P recovery.
- Key words：magnesium ammonium phosphate crystallization process recovery of nitrogen and phosphorus PHREEQC Program saturation index
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