Departament de Telecomunicació i d'Enginyeria de Sistemes, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
Departament de Telecomunicació i d'Enginyeria de Sistemes, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain; Department of Automatic Control and Electrical Engineering, "Dunarea de Jos" University of Galati, 800008 Galati, Romania.
Water Res. 2017 Nov 15;125:466-477. doi: 10.1016/j.watres.2017.08.056. Epub 2017 Aug 28.
The present paper focused on reducing greenhouse gases emissions in wastewater treatment plants operation by application of suitable control strategies. Specifically, the objective is to reduce nitrous oxide emissions during the nitrification process. Incomplete nitrification in the aerobic tanks can lead to an accumulation of nitrite that triggers the nitrous oxide emissions. In order to avoid the peaks of nitrous oxide emissions, this paper proposes a cascade control configuration by manipulating the dissolved oxygen set-points in the aerobic tanks. This control strategy is combined with ammonia cascade control already applied in the literature. This is performed with the objective to take also into account effluent pollutants and operational costs. In addition, other greenhouse gases emissions sources are also evaluated. Results have been obtained by simulation, using a modified version of Benchmark Simulation Model no. 2, which takes into account greenhouse gases emissions. This is called Benchmark Simulation Model no. 2 Gas. The results show that the proposed control strategies are able to reduce by 29.86% of nitrous oxide emissions compared to the default control strategy, while maintaining a satisfactory trade-off between water quality and costs.
本论文专注于通过应用合适的控制策略来减少污水处理厂运营中的温室气体排放。具体来说，目标是减少硝化过程中的氧化亚氮排放。好氧池中的硝化不完全会导致亚硝酸盐积累，从而引发氧化亚氮排放。为了避免氧化亚氮排放峰值，本文提出了一种级联控制配置，通过调节好氧池中的溶解氧设定点来实现。该控制策略与文献中已经应用的氨级联控制相结合，目的是还要考虑到出水污染物和运营成本。此外，还评估了其他温室气体排放源。结果是通过模拟获得的，使用了一个经过修改的考虑到温室气体排放的基准模拟模型 2（Benchmark Simulation Model no. 2），称为基准模拟模型 2 气体（Benchmark Simulation Model no. 2 Gas）。结果表明，与默认控制策略相比，所提出的控制策略能够减少 29.86%的氧化亚氮排放，同时在水质和成本之间保持令人满意的权衡。
