| Related citation: | Xiang Zhang,Jun Ma,Xixin Lu,Xiaoliu Huangfu,Jing Zou.High Efficient Removal of Trace Molybdenum from Water by FeCl3: Effects of pH and Affecting Factors in the Presence of Co-existing Background Constituents[J].Journal of Harbin Institute Of Technology(New Series),2016,23(4):75-83.DOI:10.11916/j.issn.1005-9113.2016.04.011. |
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| Author Name | Affiliation | | Xiang Zhang | State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | | Jun Ma | State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | | Xixin Lu | State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | | Xiaoliu Huangfu | State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | | Jing Zou | State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: |
| The effect of FeCl3 coagulation-filtration on the removal of trace Mo (VI) from water is investigated in the pH range of 4.00 to 9.00 and the effects of sulfate, silicate, phosphate and humic acid (HA) on the process were determined. Overall, the removal of Mo (VI) is determined by two factors: the content of Fe intercepted from water (Intercepted Fe) and the affinity between Mo (VI) (or co-existing background constituents) and adsorption sites. At low pH, where the agglomeration of the iron flocs is limited, the former factor is dominant, so the methods that can promote the agglomeration of the iron flocs, such as increasing the pH, adding co-existing constituents (sulfate, phosphate or HA), can increase the removal of Mo (VI). While at high pH, the second factor dominated. Increasing the pH weakens the affinity between Mo (VI) and the iron flocs, and co-existing background constituents (sulfate, phosphate, silicate or HA) compete with Mo (VI) for adsorption sites, both effects result in a decrease in Mo (VI) removal. The Mo (VI) removal efficiency of FeCl3 in natural water decreases as the pH increases from 4.00 to 9.00, and it is better to operate the coagulation process at pH 5.00 in the practical water treatment engineering. |
| Key words: Mo (VI) removal FeCl3 coagulation-filtration co-existing background constituents intercepted Fe competitive adsorption |
| DOI：10.11916/j.issn.1005-9113.2016.04.011 |
| Clc Number:TU991.22 |
| Fund: |
