浙江工业大学环境学院,杭州 310014
College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
为有效治理蓝藻水华,采用溶气法制备了混凝型胶质气泡,高效去除蓝藻并抑制其再生。实验在0.4 MPa压力下溶空气于表面活性剂(十二烷基二甲基甜菜碱,BS-12)和无机高分子混凝剂(聚合氯化铝,PACl)的混合溶液,产生混凝型胶质气泡,并考察了该气泡在不同初始细胞密度下对蓝藻细胞的去除及对其再生的抑制效果。结果表明,与相同方法下制得的普通气泡相比,混凝型胶质气泡粒径减小了82%,气含率提高了7.9倍。在3种不同的初始细胞密度(OD
=0.05、0.26、0.76)下,投加适量的BS-12和PACl,在5 min内85.0%~93.8%的藻细胞被去除,10 d内未见铜绿微囊藻再生长。与常规混凝-气浮工艺相比,混凝型胶质气泡具有快速高效除藻、再生抑制效果好、结构简单等优点,可为水华修复提供技术参考。
For the effective treatment of cyanobacteria-induced harmful algae blooms,the coagulative colloidal gas aphrons (CCGAs) were prepared by pressure dissolved air in this study to improve the removal of cells and inhibit their re-growth. CCGAs were generated from the dissolution of air in a mixed solution consisting of zwitterionic surfactant (dodecyl dimethyl betaine, BS-12) and inorganic polymeric coagulant (polyaluminium chloride, PACl) at the pressure of 0.4 MPa. The effectiveness of cell elimination and re-growth inhibition was investigated at different initial cell densities. The results showed that, compared with the properties of the regular bubble created by air dissolution, the size of CCGAs decreased by 82% and the gas content increased by 7.9 times. For the algal suspension with three different initial cell densities (OD
=0.05, 0.26 and 0.76), about 85.0%~93.8% of cells were removed within 5 min at the optimum dosages of BS-12 and PACl; and the re-growth of
did not occur within 10 days after treatment. Compared to traditional coagulation-flotation, the flotation with CCGAs had higher removal efficiency, more effective re-growth inhibition, rapider separation and more simplified construction. The present work can be a robust remediation technology for harmful algae-laden water bodies.
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BS-12和PACl投加量对气泡性质(粒径、半衰期、气含率)的影响
Influence of BS-12 and PACl dosages on bubble properties(particle size, half-life, gas holdup)
=0.26) with residence time
BS-12投加量(藻液处理罐中)对藻液的处理效果
Effect of BS-12 dosage (in algal solution treatment tank) on algal treatment
不同聚合氯化铝的投加量(藻液处理罐中)对藻液处理效果
Effect of PACl dosage (in algal solution treatment tank) on algal treatment
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