黄浦江水碳酸钙沉淀势的计算与实验分析

Theoretical Calculation and Experimental Analysis of the Calcium Carbonate Precipitation Potential of Huangpu River Water

使用phreeqc软件计算黄浦江水的碳酸钙沉淀势(Calcium Carbonate Precipi-tation Potential,CCPP),首次分析了地表水CCPP的理论计算值与实验值的差异原因,并作黄浦江水pH与CCPP的统计关联分析.结果表明:免费开源的phreeqc程序计算CCPP的精度同商业软件不相上下.CCPP计算值与实验值存在较大差距,主要原因在于计算时水质参数偏少.统计分析表明,黄浦江水的pH与CCPP值有一定关联,控制计算CCPP值为6～10mg/L时,实际水体CCPP值约为0～4mg/L,基本满足水质稳定要求.

Phreeqc was used to calculate the calcium carbonate precipitation potential（CCPP） of Huangpu river water.The possible reasons for the differential between calculated and experimental CCPP were firstly analyzed.Furthermore a statistical analysis was made to study the correlation between pH and CCPP of the raw waters.The results show phreeqc,a free open-source program,has similar high level of calculation accuracy with other commercial software.The difference of CCPP values between experimental and theoretical calculation are considerable,which is mainly due to the lack of water indexes.With a statistical analysis,the correlation between pH and CCPP of Huangpu river water was found.The chemical stability of raw water could be achieved by adjusting the calculated CCPP to be 0~4 mg/L CaCO3 and the experimental CCPP to be 0~4 mg/L CaCO3.