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In this paper, the circulating cooling wastewater was treated by chemical coagulation process through adding NaOH/Na2CO3.The effect of NaOH and Na2CO3 dose on removal of scale ions, such as Ca 2+ 、Mg 2+ 、Ba 2+ 、Sr 2+ 、SiO2, was studied and the removal mechanism was discussed. The results showed that the increase of NaOH dose was beneficial to the removal of above-mentioned scale ions. When NaOH was only added, the removal efficiency of Ca 2+ 、Mg 2+ 、Ba 2+ 、Sr 2+ 、SiO2 was 86.3%, 91.6%, 86.5%,doi:10.1051/e3sconf/20183802004 fatcat:whdj5v4byrgp5ef62ttsohyy7y