For a highly efficient recycling of a wastewater containing a high concentration of MgCl2,Al(Ⅲ)and P507 were scheduled to be removed in advance.In this study,the in-situ removal of Al(Ⅲ)and P507 from a high concentration MgCl2 solution at different pH values and Al/P molar ratios was investigated.The results showed that P507 formed organic complexes of Alx(OH)yz+-P507 at pH of 2.0-4.0.At pH of 4.0-5.0,Al(Ⅲ)precipitated and transferred into Al(OH)3 with a flocculent amorphous morphology.Active sites on the Al(OH)3 surface enhanced the removal efficiency of P507.At pH of 6.0-6.5,Al(Ⅲ)and Mg(Ⅱ)formed layered crystalline Al(OH)3 and MgAl2(OH)8 with small pore channels and fewer active sites,resulting in a reduced removal efficiency of P507.When the Al/P molar ratio exceeded 13 and the pH was between 4.0 and 5.0,the removal rates of both Al(Ⅲ)and P507 were higher than 98％,while the concentration loss of Mg(Ⅱ)was only 0.2％-0.9％.
关键词
原位除杂/Al(Ⅲ)/P507/MgCl2溶液/pH/Al/P摩尔比
Key words
in-situ removal/Al(Ⅲ)/P507/MgCl2 solution/pH/Al/P molar ratio
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基金项目
National Key Research and Development Program of China(2022YFB3504501)
National Natural Science Foundation of China(52274355)
National Natural Science Foundation of China(91962211)
Gansu Province Science and Technology Major Special Project,China(22ZD6GD061)
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