机构地区: 中国科学院过程工程研究所
出 处: 《环境科学》 2003年第4期85-88,共4页
摘 要: 采用微切片结合图象分析技术研究外电流 (≤ 2 5A/m2 )对自养、异养 /自养生物膜空隙率和分形维数的影响 .结果表明 ,当没有电流作用时 ,自养、异养 /自养生物膜的空隙率分别由最外层的大约 92 %和 96%减少到最内层的 5 4%左右 ;分形维数分别由 1 1和 1 0 5逐渐增大到最内层的 1 4左右 .随着通过反应器的电流密度增大 ,2种生物膜的最外层空隙率均略有下降 ,分形维数略有增大 ,而在生物膜内层 。 The spatial distributions of porosity and fractional dimension of autotrophic and heterotrophic/autotrophic biofilms applied by direct current in the range of 0~25 A/m 2 were investigated by using the micro slicing technique and image analysis. The results showed that the porosities of the autotrophic and heterotrophic/autotrophic biofilms respectively decreased from ca. 92% and 96% in the top layer to ca. 54% in the bottom layer while the fractional dimensions increased from 1 1 and 1 05 in the top layer to 1 4 in the bottom layer in the absence of current. The increase in the current density decreased the porosities and increased the fractional dimensions in the top layers. In the deeper layers, the current had insignificant influence on the porosity and fractional dimension.
领 域: [环境科学与工程]