The article presents the results of an experimental study on the clarification of biologically treated wastewater in a clarifier with a suspended sludge layer. The pilot plant was receiving effluent from trickling filters treating municipal wastewater. An experimental clarifier worked under steady-state conditions considering the influent characteristics and variable operating parameters in terms of flow velocities and height of the suspended layer. From the experimental dependences between different technological parameters it was found that the optimum range of the upward flow velocities providing a dynamic equilibrium of the suspended layer was 0.6–1.4 mm/s. Upward flow velocities below 0.5 mm/s can lead to sludge compaction at the bottom of the unit, while values greater than 1.8 mm/s may cause sludge washout. It was also found that higher suspended layer height values favor higher efficiency of the clarifier and can achieve suspended solids in the discharge of less than 5.0 mg/L; this height should be greater than 0.6 m Technological efficiency of the experimental clarifier was significantly higher than the conventional unit and was comparable with tertiary treatment technologies.

中文翻译：

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悬浮污泥层澄清器中生物处理废水的澄清

本文介绍了在带有悬浮污泥层的澄清池中对生物处理废水进行澄清的实验研究结果。中试工厂接收来自处理城市废水的滴滤器的污水。一个实验澄清池在稳态条件下工作，考虑进水特性和流动速度和悬浮层高度方面的可变操作参数。从不同技术参数之间的实验相关性发现，提供悬浮层动态平衡的向上流速的最佳范围为 0.6-1.4 mm/s。低于 0.5 mm/s 的向上流速会导致装置底部的污泥压实，而大于 1.8 mm/s 的值可能会导致污泥冲刷。还发现较高的悬浮层高度值有利于澄清池的更高效率，并且可以实现排放中悬浮固体低于 5.0 mg/L；该高度应大于0.6 m 实验澄清池的工艺效率明显高于常规装置，可与三级处理技术相媲美。