基于溶气法制备的混凝型胶质气泡用于高效去除水体中蓝藻并抑制其再生的效果

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...

Efficient elimination and re-growth inhibition of harmful bloom-forming cyanobacteria using coagulative colloidal gas aphrons prepared by pressure dissolved air

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 (OD680=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 Microcystis aeruginosa 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.