Laserfiche WebLink
dioxide (COz), sodium bisulfate (NaHSO4), and nahcolite (NaHCO3). Model input for <br />each model run is shown on the model output included as Appendix A. <br />2.2 Model Results <br />The results of the PHREEQC model runs is summarized in Figure 1. This figure shows <br />the modeled pH changes per mole of amendment added and reacted with one liter (1) of <br />CKD leachate. The results shown in Figure 1 indicate the relative effectiveness of each <br />of the additives. In order of effectiveness (from most to least effective), the additives aze <br />sulfuric acid, carbon dioxide, hydrochloric acid and sodium bisulfate, and nahcolite. <br />1 z.5 r <br />12.0 <br />11.5 <br />11.0 <br />~ 10.5 <br />0 <br />i3 <br />y 10.0 <br />`o <br />S <br />95 <br />9.0 - <br />8.5 <br />8.0 <br />7.5 <br />0.00 <br />0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 <br />Moles of Adtlaive Reaeted <br />Figure 1. Summary of the Geochemical Modeling Results Showing the Amount of Additive Reacted <br />(in moles) with 1 Liter of CKD Leachate. <br />Sulfuric acid is the most effective additive in adjusting the pH of the CKD leachate <br />because less acid is needed, relative to the other amendments, to lower the pH to 8. <br />Carbon dioxide, hydrochloric acid, and sodium bisulfate are less effective than sulfuric <br />acid, but are similar in effectiveness when compared with one another. Nahcolite is <br />relatively ineffective considering the mass of additive needed to adjust the pH to 8. Table <br />-HCL <br />-C02 GAS <br />-HZSOa <br />rvaMSOa <br />CEMEX Water Treaonent Plan ¢ Revision 0 <br />