浮珠浮选法中浮珠材料对小球藻采收效率的影响

EFFECT OF BUOY-BEAD MATERIAL ON CHLORELLA VULGARIS HARVESTING PERFORMANCE DURING FLOTATION

浮珠浮选法是目前一种新的微藻采收方法,其中浮珠材质对于采收效率具有重要影响。为选取采收效率高的浮珠材料及其探索在采收过程中与小球藻的作用机理,以普通小球藻为例,选用目前较为常见的硅硼酸钠、空心玻璃珠、粉煤灰和乳胶颗粒作为浮珠材料进行分析,发现硅硼酸钠采收效率最高,在不添加药剂的条件下可达到63.24%。浮珠颗粒和微藻粘附过程中在16.6 nm时出现第二能穴,硅硼酸钠表面疏水性和粗糙度是影响采收率的主要因素。

Buoy-bead flotation is a new microalgae harvesting method at present.The bead material has an important effect on harvesting efficiency.In order to achieve a high-efficiency bead material and mechanism during flotation,the study chose Chlorella vulgaris as the flotation microalgae and sodium borosilicate,hollow glass,fly ash and latex as the bead material.The experimental results showed that the harvesting efficiency of sodium borosilicate could achieve 63.24% without flotation reagent.The sodium silicate borate material could achieve high harvesting efficiency,because there was a secondary minimum at 16.6 nm during adhesion with microalgae.Sodium silicate had a strong hydrophobicity,which was easy to adhere to Chlorella vulgaris.Sodium silicate also had high surface roughness,which provided more binding sites.The two reasons were also important factors of high Chlorella vulgaris harvesting efficiency.