The article describes the results achieved in 5 years of monitoring of a large wastewater treatment plant (700,000 PE) in Southern Italy, which has a conventional activated sludge process scheme and electricity as exclusive energy source. The monitoring involved a preliminary phase ("static" monitoring) for the analysis of historical data on the main process-related variables, using the approach of normalization techniques. In the second monitoring phase ("dynamic" monitoring) the theoretical distribution of the energy load among the electromechanical units of the plant was first studied; then, an energy monitoring system was implemented on the most energy-consuming unit of the plant, a 500 kW turbo-blower, with the aim of analysing in detail its real-time performance and investigating potential correlations with other process parameters (wastewater flow rates and associated pollutant load). Results of the static monitoring suggest good overall performances, both from an energy and environmental point of view, even if the plant works close to the maximum hydraulic capacity due to the massive infiltrations. In particular, focusing on the energy performances, the plant consumes on average 0.17 kWh/m³, 28 kWh/PE/year and 0.66 kWh/kgCOD_removed. The results of dynamic monitoring, on the other hand, indicate that the turbo-blower consumes 30% less energy than what initially estimated through the theoretical model, but its functioning does not seem to be influenced by the other process parameters; this latter result reveals an inadequate energy management of the most power-absorbing electromechanical units of the plant and the consequent need to adopt effective strategies for energy optimization.

本文介绍了意大利南部一家大型废水处理厂（700,000 PE）的5年监测结果，该厂具有常规的活性污泥处理方案，并以电作为唯一能源。监视涉及一个初步阶段（“静态”监视），该阶段使用归一化技术方法分析与过程相关的主要变量的历史数据。在第二个监视阶段（“动态”监视）中，首先研究了设备的机电单元之间的能量负荷的理论分布。然后，在工厂中最耗能的设备上安装了一个能源监控系统，即500 kW涡轮鼓风机，目的是详细分析其实时性能，并调查与其他过程参数（废水流速和相关污染物负荷）的潜在相关性。从能源和环境的角度来看，静态监测的结果表明总体性能良好，即使该工厂由于大量渗入而接近最大水力负荷也是如此。特别是，在能源表现方面，该工厂的平均能耗为0.17 kWh / m³，28千瓦时/ PE /年和0.66千瓦时/ kgCOD_删除。另一方面，动态监控的结果表明，涡轮鼓风机的能耗比理论模型最初估计的能耗低30％，但其功能似乎不受其他工艺参数的影响；后一个结果表明，工厂中最耗电的机电单元的能量管理不足，因此需要采取有效的策略进行能量优化。