内源呼吸状态活性污泥对纳米颗粒的生物吸附特性研究

wo kinds of commonly-used engineered nanoparticles, namely TiO2, ZnO and activated sludge mixed liquor taken from Xiaohongmen wastewater treatment plant in Beijing were used for the study of the adsorption characteristics between them. Through static and dynamic adsorption experiments, the bioadsorption mechanism and influencing factors between the aerobic activated sludge at endogenous respiratory state and the nanoparticles were studied. Results show that the pseudo second-order kinetic equation is suitable to simulate the TiO2 and ZnO nanoparticles bioadsorption process on the activated sludge. The adsorption isotherms of both nanoparticles on the activated sludge accord with the Freundlich model. The chemical adsorption are dominant in process of both ZnO and TiO2 nanoparticles on activated sludge. Moreover, the adsorption type is a multilayer adsorption process. The bioadsorption capacity of activated sludge towards nanoparticles is between easy and difficult to adsorp.