微颗粒在表面粘附的力学模型可视化研究

通过中外文数据库对微颗粒在表面粘附的力学模型研究成果进行了检索,分析发现这些模型抽象、不直观,不利于理解和研究粘附的机理,基于此,利用MATLAB软件对这些粘附力学模型进行可视化模拟,通过归纳、分析和总结评价,提出今后的研究方向.     

Magnetic micro-particle conditioning–pressurized vertical electro-osmotic dewatering (MPEOD) of activated sludge: Role and behavior of moisture and organics

In this study, a magnetic micro-particle conditioning–pressurized vertical electro-osmotic dewatering (MPEOD) process with magnetic micro-particle conditioning–drainage under gravity–mechanical compression–electrical compression (MMPC–DG–MC–EC) stages was established to study the distribution and migration of water, extracellular polymeric substances (EPS), and other organic matter in the activated sludge (AS) matrix at each stage. Results showed that the MPEOD process could attain 53.52% water content (WC) in dewatered AS with bound water (BW) and free water (FW) reduction rates of 82.97% and 99.67%, respectively. The coagulation and time-delayed magnetic field effects of magnetic micro-particles (MMPs) along the MMPC–DG–MC stages initiated the transformation of partial BW to FW in AS. EC had a coupling driving effect of electro-osmosis and pressure on BW, and the changes in pH and temperature at EC stage induced the aggregation of AS flocs and the release of partial BW. Additionally, MMPs dosing further improved the dewatering performance of AS by acting as skeleton builders to provide water passages. Meanwhile, MMPs could disintegrate sludge cells and EPS fractions, thereby reducing tryptophan-like protein and byproduct-like material concentrations in LB-EPS as well as protein/polysaccharide ratio in AS matrix, which could improve AS filterability. At EC stage, the former four Ex/Em regions of fluorescence regional integration analysis for EPS were obviously reduced, especially the protein-like substances in LB- and TB-EPS, which contributed to improvement of AS dewaterability.     

微颗粒在表面粘附的力学模型

微颗粒粉尘对于工农业生产及人的身体健康都会造成危害,而微颗粒粘附数学模型是对其进行研究和控制的基础,有着十分重要的意义。微颗粒与表面粘附力学模型研究取得了很大的进展,作者通过在一些重要中外文数据库对微颗粒在表面粘附的力学模型研究成果进行了分析,这些粘附力主要是物理吸附力的范德华力、静电力、磁力、毛细作用力。在此基础上对各个力进行归纳、评述,并指出了各个模型的实际应用。对各种力学模型进行总结,然后以一个例子说明微颗粒粉尘在多种力同时作用时的力的简单合成情况,最后提出了本领域的研究展望。