生物膜形成与发展二维动态模拟(英文)

Two-Dimension Dynamic Simulations on Biofilm Forming and Developing

生物膜微观结构与形态特征直接影响废水生物处理效果。混合微生物可在适宜载体表面形成各种各样的生物膜,且其形成与发展是一个动态过程。采用差分-离散复合法动态模拟二维区域上的基质传递、生物膜形成与发展过程,并探讨生物质生长时间与初始接种数等对生物膜结构与形态造成的影响。与传统生物膜模型不同之处在于其结构特性包括孔隙率、厚度和密度等都是模型输出量。

It played an important role for biofilm microstructure and morphology on wastewater biological treatments. Multi-species microorganisms were able to form varietics of hiofilnl on adaptive carriers, and the process of biofihn to form and develop on carriers was multi-dimensional and dynamic. In this article, substrate transfer, biofihn formation and development in a two-dimension space were dynamically simulated with a combined discrete-differential method. The micro structural and morphological characteristics, such as biofilm thickness, density and porosity, were obtained as model output by using this new-type model. Meanwhile, the effects of the growing time and initial inoculation number of microorganisms on biofilm microstructure and morphology were also discussed. Firstly, the thickness of biofilm was increasing along with the growing time of biomass extending. At tile time of 30 h for biofilm formation and development, it was not completely covered for carrier by biomass, and the fluctuation of biofilm was very ambient; but at the time of 60 h, biomass had covered the carrier entirely, and the fluctuation of biofihn tended to gentleness. Seasonally, as hiomass growing time was 30 h, it was not covered completely for carrier by biomass with different initial inoculating number of 50, 150 and 250. And the covering degree of biomass was improving along with initial inoculating number increasing. Especially, as initial inoculating number was 250, it was nearly covered for carrier by biomass.