本文所述的研究旨在从根本上理解流态化反冲洗条件下生物颗粒与非生物颗粒的分离情况。这项研究深入了解了颗粒的相对去除和分离机制，以及颗粒附着在介质颗粒表面的强度和位置。实验结果仅与细菌作为生物颗粒有关；然而，这个理论也可能适用于原生动物。具体目标是比较流化床膨胀反洗过程中生物颗粒和非生物颗粒的分离，从理论上计算这些颗粒群分离所涉及的力，并从微观角度分析实验结果- 力学力模型。包括50个参考文献、表格和图表。

The research described in this article was directed toward achieving a fundamental understanding of detachment of biological particles compared with that of nonbiological particles under fluidization backwash conditions. This study provided insights into the particles' comparative removal and detachment mechanisms as well as the strength and location of their attachment to the surfaces of media grains. The experimental results relate only to bacteria as the biological particles; however, the theory may also be applicable to protozoa. Specific objectives were to compare the detachment of biological particles with nonbiological particles during fluidized bed expansion backwash, calculate theoretically the forces involved in detachment of these groups of particles, and analyze experimental results in terms of a micro-mechanics force model. Includes 50 references, table, figures.