Abstract This study used a theoretical model and an experimental system to investigate the feasibility of using inclined plate settlers (IPSs) to upgrade the secondary clarifier for bulking sludge recovery in the high-rate microaerobic activated sludge (MAS) process that achieved enormous reduction in aeration energy consumption during domestic wastewater treatment. Compared to bulking sludge concentration (1.2–4.2 g/L) (and thus varied sludge zone settling velocities), both the experimental results and the theoretical predictions demonstrated that the plate length-to-spacing (L/D) ratio (3.75–15) of the IPSs likely plays a decisive role in determining its treatment capacity of the IPSs for bulking sludge recovery. The theoretical model was finally simplified to predict the critical surface loading rate of the IPSs as a function of the L/D ratio. The maximum biomass concentration in the micro-aeration tank of the high-rate MAS process was set at 4.5 g/L to assure effective sludge/water separation and bulking sludge recovery. Lastly, the continuous operation of the high-rate MAS-IPS process over a lengthy period achieved stable effluent turbidity of 28%.

中文翻译：

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优化斜板沉降器用于生活污水处理的高速微好氧活性污泥工艺：理论模型和实验验证

摘要 本研究使用理论模型和实验系统研究了使用斜板沉降器 (IPSs) 升级二级澄清池以在高速微好氧活性污泥 (MAS) 工艺中进行膨胀污泥回收的可行性，该工艺实现了曝气量的大幅减少。生活污水处理过程中的能源消耗。与膨胀污泥浓度 (1.2–4.2 g/L)（以及因此不同的污泥区沉降速度）相比，实验结果和理论预测均表明板长与间距 (L/D) 比 (3.75–15 ) 的 IPS 可能在确定其用于膨胀污泥回收的 IPS 处理能力方面起着决定性作用。最后简化理论模型以预测作为 L/D 比函数的 IPS 的临界表面负载率。高速 MAS 工艺的微曝气池中的最大生物质浓度设置为 4.5 g/L，以确保有效的污泥/水分离和膨胀污泥回收。最后，高速率 MAS-IPS 工艺长时间的连续运行实现了 28% 的稳定出水浊度。