Response surface optimization of ultra high life aluminum process for removing chloride ions from high chlorine wastewater
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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