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利用管段模拟反应器,定量研究了调节淡化海水pH、碱度及与自来水混合比例对管网铁释放的控制作用。研究发现:提高pH、碱度与混合自来水都对管网铁释放有显著的控制效果。调节pH从6.6到8.2,浊度减少58.4%,铁释放减少了41.6%;增加碱度到130mg/L(以CaCO_3计),浊度降低83.3%,铁释放减少了74.3%;淡化海水的混合比例为60%时,碳酸钙沉淀势(CCPP)大于-1.2mg/L,铁释放减少了89.2%。同时还研究了铁释放浓度与水质判别指数的关系,当CCPP小于-1.2mg/L时,铁释放浓度与CCPP呈良好的线性关系(R2=0.993 7);铁释放浓度与拉森指数(LRI)也具有良好的线性关系(R2=0.986 7)。可以根据此线性关系定量表征淡化海水的腐蚀性强弱。
The tube reactor was used to quantitatively study the control effects of desalinated seawater pH, alkalinity and mixing ratio with tap water on iron release from pipe network. The study found that: raising the pH, alkalinity and tap water have a significant control effect on iron release. Adjusting pH from 6.6 to 8.2, turbidity decreased 58.4%, iron release decreased 41.6%; increased alkalinity to 130mg / L (as CaCO_3 dollars), turbidity decreased 83.3%, iron release decreased by 74.3%; desalination of seawater mixture When the ratio is 60%, the precipitation potential of calcium carbonate (CCPP) is greater than -1.2 mg / L, and the release of iron is reduced by 89.2%. The relationship between iron release concentration and water quality index was also studied. When CCPP was less than -1.2mg / L, the iron release concentration had a good linear relationship with CCPP (R2 = 0.993 7); iron release concentration and Larsen index ) Also had a good linear relationship (R2 = 0.986 7). Based on this linear relationship, the corrosivity of desalinated seawater can be quantitatively characterized.