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篇目详细内容 |
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【篇名】 |
Suspended solid abatement in a conical fluidized bed flocculator |
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【刊名】 |
Frontiers of Environmental Science and Engineering in China |
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【刊名缩写】 |
Front.Environ.Sci.Engin.China |
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【ISSN】 |
2095-2201 |
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【EISSN】 |
2095-221X |
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【DOI】 |
10.1007/s11783-012-0415-x |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2013 |
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【卷期】 |
7
卷1期 |
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【页码】 |
127-134
页,共
8
页 |
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【作者】 |
Dandan ZHOU;
Shuangshi DONG;
Keyu LI;
Huizhong JIANG;
Dandan SHANG;
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【关键词】 |
conical fluidized bed; flocculation; velocity gradient |
【摘要】 |
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With the random movement of silica gel beads in a conical fluidized bed, micro-vortices resulting from the fluidization promoted the collision and aggregation of suspended fine kaolin powders. The abatement efficiencies of the suspended fine solids under several hydrodynamic conditions were studied, and a suitable control strategy for operating the conical fluidized bed flocculators was identified. The suspended solids abatement efficiency was found to increase with increasing Camp Number and flocculation time (T), but decreased with the increase of velocity gradient (G) within the range studied in this research (165.1–189.6？s？1). The abatement efficiencies were all more than 60% at the range of G = 165–180？s？1 and T = 15–33？s at an initial kaolin solid concentration of 150？mg·L？1, polymer aluminum chloride dosage of 60？mg·L？1 and sedimentation time of 20？min. However, the formation of flocs was influenced by the liquid backmixing. Excessive backmixing caused the breakup of flocs and resulted in difficulty for the fine powders to aggregate and sediment to the reactor bottom. The results of the calculated fractal dimension and measured free sedimentation velocity of flocs obtained at different runs showed similar flocs properties, and indicated an easy control strategy for sedimentation of the flocs. |
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