Taking high chlorine wastewater generated in industrial production as the experimental object,the ultra high lime alumi-num(UHLA)process was used to remove chloride ions(Cl-)from high chlorine wastewater.Based on single factor results and Cl-re-moval rate as the response value,the Box-Behnken center combination test was used to optimize the process parameters.The results showed that the calcium chloride molar ratio had a significant impact on Cl-removal rate,temperature had a significant impact on Cl-removal rate,while the aluminum chloride molar ratio had no significant effect on Cl-removal rate.The degree of influence ranked from large to small as follows:calcium chloride molar ratio,temperature,and aluminum chloride molar ratio;the optimal process pa-rameters for removing Cl-from high chlorine wastewater using UHLA process were n(Ca):n(Al):n(Cl)=5.4:2.9:1.0,reaction tem-perature of 25.5℃,and theoretical Cl-removal rate of 90.56％;the optimal process was horizontally validated using simulated waste-water,and the Cl-removal rate in simulated wastewater was 97.85％,significantly higher than that in industrial high chlorine wastewa-ter;ICP-MS was used to analyze the elemental changes in high chlorine wastewater before and after treatment with UHLA process.It was found that UHLA process could effectively remove anions such as SO42-,SO32-,and I-,and heavy metal ions such as Sr2+,Cr3+,and Zn2+.
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