Effect of Cone-Plate Clarifier Structure Parameters on Flocculation Efficiency
In this study, a coal mine water flocculation system was established. A series of flocculation tests were carried out at different structural parameters (cylinder height, cone-plate insertion depth and cone-plate spacing) to better investigate the effect of the cone-plate clarifier on coal mine wate...
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MDPI AG
2021-12-01
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| author | Yulong Zhang Peikun Liu Linjing Xiao Long Chang Fangping Yan Lanyue Jiang |
| author_facet | Yulong Zhang Peikun Liu Linjing Xiao Long Chang Fangping Yan Lanyue Jiang |
| author_sort | Yulong Zhang |
| collection | DOAJ |
| description | In this study, a coal mine water flocculation system was established. A series of flocculation tests were carried out at different structural parameters (cylinder height, cone-plate insertion depth and cone-plate spacing) to better investigate the effect of the cone-plate clarifier on coal mine water treatment performance. Sixteen sampling points were set up in the system for data monitoring to generate the required data. The cone-plate clarifier was divided into five zones for flocculation analysis. The increased cylinder height facilitated the flocculation of particles in the micro flocculation zone and the settling of particles in the settlement zone. The chemicals used are polyaluminum chloride (PACl), Fe<sub>3</sub>O<sub>4</sub> and polyacrylamide (PAM), corresponding to doses of 60 mg/L, 40 mg/L and 6 mg/L, respectively. Insufficient insertion depth of the cone-plate will cause the small flocs that have not been fully flocculated to enter the exit pipe zone directly through the cone-plate, while too much insertion depth will cause the large floc in the settlement zone to re-enter the exit pipe zone. The flocculation effect of small flocs increased as the cone-plate spacing decreased, which is consistent with the shallow pool theory. When the cone plate spacing was too narrow, the amount of fluid was reduced and the increase in fluid velocity reduced the flocculation effect. Curve fitting was conducted for Suspended solids(SS) and turbidity removal efficiency under each structural parameter to derive the variation of SS and turbidity removal efficiency under different structural parameters. The regression models of SS and turbidity removal efficiency on the cylinder height, cone-plate insertion depth and cone-plate spacing were established based on the curve fitting results, and the regression models were verified to be well fitted based on the comparison of experimental results. Finally, the optimal values of SS and turbidity removal efficiency were found based on the regression model. The flow rate of the cone-plate clarifier is 0.6 m<sup>3</sup>/h. The SS removal efficiency reached 96.82% when the cylinder height was 708 mm, the cone-plate insertion depth was 367 mm and the cone-plate spacing was 26 mm. The turbidity removal efficiency reached 86.75% when the cylinder height was 709 mm, the cone-plate insertion depth was 369 mm and the cone-plate spacing was 26 mm. |
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| issn | 2297-8739 |
| language | English |
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| spelling | doaj.art-7114814af22b487aad7fad59fb89836e2023-11-23T15:23:08ZengMDPI AGSeparations2297-87392021-12-0191610.3390/separations9010006Effect of Cone-Plate Clarifier Structure Parameters on Flocculation EfficiencyYulong Zhang0Peikun Liu1Linjing Xiao2Long Chang3Fangping Yan4Lanyue Jiang5College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaIn this study, a coal mine water flocculation system was established. A series of flocculation tests were carried out at different structural parameters (cylinder height, cone-plate insertion depth and cone-plate spacing) to better investigate the effect of the cone-plate clarifier on coal mine water treatment performance. Sixteen sampling points were set up in the system for data monitoring to generate the required data. The cone-plate clarifier was divided into five zones for flocculation analysis. The increased cylinder height facilitated the flocculation of particles in the micro flocculation zone and the settling of particles in the settlement zone. The chemicals used are polyaluminum chloride (PACl), Fe<sub>3</sub>O<sub>4</sub> and polyacrylamide (PAM), corresponding to doses of 60 mg/L, 40 mg/L and 6 mg/L, respectively. Insufficient insertion depth of the cone-plate will cause the small flocs that have not been fully flocculated to enter the exit pipe zone directly through the cone-plate, while too much insertion depth will cause the large floc in the settlement zone to re-enter the exit pipe zone. The flocculation effect of small flocs increased as the cone-plate spacing decreased, which is consistent with the shallow pool theory. When the cone plate spacing was too narrow, the amount of fluid was reduced and the increase in fluid velocity reduced the flocculation effect. Curve fitting was conducted for Suspended solids(SS) and turbidity removal efficiency under each structural parameter to derive the variation of SS and turbidity removal efficiency under different structural parameters. The regression models of SS and turbidity removal efficiency on the cylinder height, cone-plate insertion depth and cone-plate spacing were established based on the curve fitting results, and the regression models were verified to be well fitted based on the comparison of experimental results. Finally, the optimal values of SS and turbidity removal efficiency were found based on the regression model. The flow rate of the cone-plate clarifier is 0.6 m<sup>3</sup>/h. The SS removal efficiency reached 96.82% when the cylinder height was 708 mm, the cone-plate insertion depth was 367 mm and the cone-plate spacing was 26 mm. The turbidity removal efficiency reached 86.75% when the cylinder height was 709 mm, the cone-plate insertion depth was 369 mm and the cone-plate spacing was 26 mm.https://www.mdpi.com/2297-8739/9/1/6coal mine waterflocculation systemcone-plate clarifierstructure parametersregression models |
| spellingShingle | Yulong Zhang Peikun Liu Linjing Xiao Long Chang Fangping Yan Lanyue Jiang Effect of Cone-Plate Clarifier Structure Parameters on Flocculation Efficiency Separations coal mine water flocculation system cone-plate clarifier structure parameters regression models |
| title | Effect of Cone-Plate Clarifier Structure Parameters on Flocculation Efficiency |
| title_full | Effect of Cone-Plate Clarifier Structure Parameters on Flocculation Efficiency |
| title_fullStr | Effect of Cone-Plate Clarifier Structure Parameters on Flocculation Efficiency |
| title_full_unstemmed | Effect of Cone-Plate Clarifier Structure Parameters on Flocculation Efficiency |
| title_short | Effect of Cone-Plate Clarifier Structure Parameters on Flocculation Efficiency |
| title_sort | effect of cone plate clarifier structure parameters on flocculation efficiency |
| topic | coal mine water flocculation system cone-plate clarifier structure parameters regression models |
| url | https://www.mdpi.com/2297-8739/9/1/6 |
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