Abstract:The biofilm were cultured in a self-designed reactor by adjusting the ratio of nutrients in order to get 3different biofilms as adsorbents for Cu2+, in which the proportion of protein and polysaccharide were 7:1, 5:1and 10:1respectively. This paper had a study on the adsorption of 3different bilfilms to Cu2+. Besides, the adsorption mechanism was discussed. The results showed that the biofilm became mature after 8days. When the value of C/N was 12, the biofilm grew better than that C/N was 4and 37, and the number of bacteria on it was more than the the number of bacteria on C/N =4and C/N=37. PN/PS value was smaller, and the adsorption capacity of Cu2+ was higher. The amount of Cu2+ adsorbed on EPS3is higher than EPS1(7.37%) and EPS2(7.62%). Cu2+ was absorbed on the biofilm, the concentration of Ca2+, Mg2+, K+ was significantly increased in the solution, demonstrating ion exchange play a main role during the adsorption and Cu2+ prefer to exchange with divalent Ca2+ and Mg2+. As the concentration of KNO3was from 0.1to 0.6mol/L, along with the increase of ionic strength, the Cu2+ content adsorbed on biofilm decreased rapidly. However, the concentration of KNO3is greater than 0.6mol/L, the change of Cu2+content adsorbed by biofilm trended to be gentle, the phenomenon showed that Cu2+ adsorption mechanism include ion exchange and chemical adsorption.
胡学伟, 李姝, 荣烨, 李媛. 不同EPS组成生物膜对Cu2+吸附的研究[J]. 中国环境科学, 2014, 34(7): 1749-1753.
HU Xue-Wei, LI Shu, RONG Ye, LI Yuan. The research on biofilm composed by different EPS to adsorb Cu2+. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(7): 1749-1753.