固体停留时间SRT是生物体（污泥）在处理构筑物内的平均驻留时间，即污泥龄。从直观上看，可以用处理构筑物内的污泥总量与剩余污泥排放量的比值来表示，其单位一般为d。
启动过程中污泥固体物质在ASBR中不断积累而保持较高的固体停留时间(SRT)，有助于提高处理效率。
During the start-up process, the solids of sewage sludge accumulated continuously in ASBR and kept longer solid retention time (SRT), helpful to enhance the treatment efficiency.
固体颗粒在床层迅速混合，导致颗粒在反应器中停留时间不均。
The rapid mixing of solids in the bed leads to nonuniform residence times of solids in the reactor.
对试验所得的固体颗粒停留时间分布曲线的分析明显表明床内存在着由于流体动力特性和几何结构引起的颗粒返混。
The experiments show that the solid reflux due to hydrodynamic and geometrical reasons are clearly observed in the analysis of the RTD (residence time distribution) curves.
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