In order to explore the adsorption-desorption characteristics of live and dead Chlorella ellipsoidea in Guizhou karst. Experi- ment in dark environment analysis it to mercury the optimum adsorption conditions,kinetic characteristics of Chlorella ellipsoidea adsorb mercury and isothermal adsorption model were analyzed as well. The experimental results showed that Chlorella ellipsoidea had strong adsorption capacity in weak acid or neutral (pH=3-8) water environment and the optimum adsorption concentration was 3. 2× 10^6 cells/mL. Total adsorption increased with the increment of Chlorella ellipsoidea’s abundance,but unit adsorption capacity decreased with the increasement of abundance. The maximum removal rate of live and dead algae were 71. 2% and 62. 9%,respectively. Chlorella ellipsoidea on mercury adsorption is mainly divided into biological adsorption and bioaccumulation in two stages,including the dead algae cells are mainly composed of biosorption,living algal cells except with biosorption biological enrichment can be adsorbed, algal cells biology of mercury enrichment ability related to algal abundance and mercury concentrations in the environment. Besides,the adsorption process conforms to the first-order and two-order kinetic models,and the two-order kinetic model had better fitting effect, better results were obtained of othermal adsorption model fitting by the Langmuir isotherm model. In the process of desorption of mercury,the decomposal ability of the elliptic chlorella is stronger and the living algae is accompanied by the biological enrichment during the desorption process,and the desorption equilibrium can be achieved by the dead algae and living algae after 1440 min.
Earth and Environment
贵州省科技厅社会发展攻关项目(黔科合 LH 字7334)