期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 211, 期 -, 页码 658-666出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.10.047
关键词
Microalgae; Fly ash; Waste heat; Removal; Flotation
资金
- National Natural Science Foundation of China [41230314]
- Natural Science Foundation of Shaanxi Province [2017JM5054]
- Key Laboratory of Degraded and Unused Land Consolidation Engineering of the Ministry of Land and Resources of China [SXDJ2017-6]
- Fund Project of Shaanxi Key Laboratory of Land Consolidation [2018-ZD04]
- Special Fund for Basic Scientific Research of Central Colleges, Chang'an University [310829163406, 310829172001]
To improve the recovery efficiency of buoyant-bead flotation (BBF), a novel compound buoyant-bead flotation technology (CBBF) using acidified fly ash cenospheres with heat-aided pre-flocculation was developed. The effects of cenospheres concentration (0.6-3 g L-1), flotation time (5-20 min) and pH values (2-10) were studied. Response Surface Methodology was utilized to optimize the CBBF process. The results showed that pH value had the greatest influence on the recovery process. When pH values were low, the Chiorella vulgaris (C. vulgaris) cells began to flocculate, which helped to form the C. vulgaris-cenosphere aggregates and improved the recovery efficiency. To avoid the addition of flocculants, heat-aided pretreatment was used to promote flocculation process. The maximum recovery efficiency (93.04 +/- 0.60%) was obtained at cenospheres concentration of 2.83 g L-1, pH value of 2.41, flotation time of 17.05 mins and flotation temperature of 90 degrees C. Furthermore, it was demonstrated that this CBBF method can be also widely applied to other microalgae strains, such as Scenedesmus obliquus, Spirulina platensis, Microcystis aeruginosa and Anabaena variabilis. It can be concluded that the CBBF technology is a feasible and highly efficient (over than 90%) process for the removal of various microalgae.
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