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Research on The Removal of Scale Ions from Circulating Cooling Wastewater by Chemical Coagulation Process

Song Du, Wenbiao Jin, Feng Duan, M. Mostafa
2018 E3S Web of Conferences  
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%,
more » ... 3%, 91.6%, 86.5%, 58.1%, 84.2%, respectively. When 680 mg/L of NaOH and 300 mg/L of Na2CO3 were added, and the effluent pH was above 11.2, the removal efficiency of Ca 2+ 、Mg 2+ was 95.8% and 89.4%, respectively, and the concentration of Ca2+and Mg2+ was below 20 mg/L, which met the target of wastewater treatment. Finally the possible removal mechanism of Ca 2+ , Mg 2+ , Ba 2+ , Sr 2+ and SiO2 was discussed.
doi:10.1051/e3sconf/20183802004 fatcat:whdj5v4byrgp5ef62ttsohyy7y