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首页> 外文期刊>Chemical Engineering Communications >Modeling Dissolved Oxygen Concentration for Optimizing Aeration Systems and Reducing Oxygen Consumption in Activated Sludge Processes: A Review
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Modeling Dissolved Oxygen Concentration for Optimizing Aeration Systems and Reducing Oxygen Consumption in Activated Sludge Processes: A Review

机译:模拟溶解氧浓度以优化曝气系统并降低活性污泥工艺中的氧气消耗:综述

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Aeration accounts for 30% to 75% of the total energy consumption in activated sludge processes (ASPs). This percentage can be significantly reduced since most aeration systems are not optimized for unsteady influent flow rates and oxygen requirements. Reconfiguration, replacement, and the application of optimal dissolved oxygen (DO) control strategies for current aeration systems within the facility and model-based optimization of DO in wastewater treatment plants can lead to impressive increased energy efficiency and savings and improved stability of the system. These measures increase the operational lifetime of the aeration equipment and improve effluent and activated sludge quality. This article provides a review of two critical nonlinear time-varying parameters that characterize the DO concentration dynamics in an ASP: the oxygen uptake rate (OUR), related to microorganism activity, and the volumetric oxygen mass transfer function, represented by the oxygen transfer rate (OTR). Second, the physico-chemical, geometric, and dynamic factors and aerator type affecting the oxygen mass transfer coefficient (K_La) are thoroughly discussed. The article concludes with model-based optimization, explaining the usefulness of accurate DO models in wastewater treatment, and provides examples for plant-wide or water chain cycle-focused optimizations.
机译:曝气占活性污泥工艺(ASP)中总能耗的30%至75%。由于大多数曝气系统并未针对不稳定的进水流量和氧气需求进行优化,因此可以大大降低该百分比。重新配置,更换和在工厂中的当前曝气系统中应用最佳溶解氧(DO)控制策略,以及废水处理厂中基于模型的DO的优化可以显着提高能源效率,节省成本并提高系统的稳定性。这些措施延长了曝气设备的使用寿命,并改善了污水和活性污泥的质量。本文对表征ASP中DO浓度动态的两个关键非线性时变参数进行了综述:与微生物活性有关的氧气吸收率(OUR),以及由氧气迁移率表示的体积氧气传质函数(OTR)。其次,对影响氧气传质系数(K_La)的物理化学,几何和动态因素以及曝气器类型进行了详细讨论。本文以基于模型的优化为结尾,解释了精确的DO模型在废水处理中的实用性,并提供了针对整个工厂或以水链循环为重点的优化的示例。

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