能源微藻无泡采收新方法及其性能

Novel method of buoy-bead flotation for harvesting micro-algae and its performance

采用低密度浮珠颗粒代替气泡的无泡采收方法,高效低成本采收能源微藻.以常见能源微藻小球藻为例,以硅硼酸钠为浮珠,比较了浮珠浮选工艺与传统气浮法的区别,通过响应面法优化了浮珠浮选工艺.结果表明,以硅硼酸钠为浮珠的无泡采收效果较理想,浮珠颗粒粒径、浓度和搅拌速率对采收率影响显著,颗粒直径56？m、浓度0.546 g/L、搅拌速率133 r/min的条件下采收率最好,达83.7%.

Buoy-bead flotation（BBF） technology used low density hollow microspheres instead of air bubbles to harvest microalgae with high efficiency and low energy consume. Chlorella vulgaris（common energy microalgae） and sodium borosilicate glass microspheres were chosen as experimental microalgae and cenospheres in BBF process. BBF method was compared with traditional dissolved air flotation method. Response surface methodology was used to optimize the process of BBF method. The results showed that the flotation rate with sodium borosilicate was ideal. Microspheres particle size, concentration and stirring speed had significant influence on flotation rate. The rate could be 83.7% under the conditions of particle size 56 ？m, particle concentration 0.546 g/L and stirring speed 133 r/min.