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Relationship between manual air valve positioning, water quality and energy usage in activated sludge processes.
Water Research ( IF 11.4 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.watres.2020.115537 Samuel Reifsnyder 1 , Manel Garrido-Baserba 1 , Francesca Cecconi 1 , Larry Wong 2 , Phil Ackman 2 , Nikos Melitas 2 , Diego Rosso 1
Water Research ( IF 11.4 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.watres.2020.115537 Samuel Reifsnyder 1 , Manel Garrido-Baserba 1 , Francesca Cecconi 1 , Larry Wong 2 , Phil Ackman 2 , Nikos Melitas 2 , Diego Rosso 1
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Diffused aeration is the most implemented method for oxygen transfer in municipal activated sludge systems and governs the economics of the entire treatment process. Empirical observations are typically used to regulate airflow distribution through the adjustment of manual valves. However, due to the associated degrees of freedom, the identification of a combination of manual valves that optimizes all performance criteria is a complex task. For the first time a multi-criteria optimization algorithm was used to minimize effluent constituents and energy use by parametrizing manual valves positions. Data from a full-scale facility in conjunction with specific model assumptions were used to develop a base-case facility consisting of a detailed air supply model, a bio-kinetic model and a clarification model. Compared to the base-case condition, trade-offs analysis showed potential energy savings of up to 13.6% and improvement of effluent quality for NH4+ (up to 68.5%) and NOx (up to 81.6%). Based on two different tariff structures of a local power utility, maximum costs savings of 12800 USD mo-1 to 19000 USD mo-1 were estimated compared to baseline condition.
中文翻译：
活性污泥工艺中手动空气阀的位置，水质和能耗之间的关系。
扩散曝气是市政活性污泥系统中最有效的氧气转移方法，它控制着整个处理过程的经济性。经验性观察通常用于通过调节手动阀来调节气流分布。然而，由于相关的自由度，识别优化所有性能标准的手动阀组合是一项复杂的任务。首次使用多准则优化算法通过对手动阀门位置进行参数化来最大程度地减少废水成分和能源消耗。全面设施的数据与特定的模型假设一起用于开发基本案例的设施，该设施包括详细的空气供应模型，生物动力学模型和澄清模型。与基本情况相比，权衡分析显示，潜在的节能效果高达13.6％，并且NH4 +（高达68.5％）和NOx（高达81.6％）的出水质量得到改善。根据当地电力公司的两种不同电价结构，与基准条件相比，估计最大成本节省为12800 USD mo-1至19000 USD mo-1。
更新日期：2020-01-27
中文翻译：
活性污泥工艺中手动空气阀的位置，水质和能耗之间的关系。
扩散曝气是市政活性污泥系统中最有效的氧气转移方法，它控制着整个处理过程的经济性。经验性观察通常用于通过调节手动阀来调节气流分布。然而，由于相关的自由度，识别优化所有性能标准的手动阀组合是一项复杂的任务。首次使用多准则优化算法通过对手动阀门位置进行参数化来最大程度地减少废水成分和能源消耗。全面设施的数据与特定的模型假设一起用于开发基本案例的设施，该设施包括详细的空气供应模型，生物动力学模型和澄清模型。与基本情况相比，权衡分析显示，潜在的节能效果高达13.6％，并且NH4 +（高达68.5％）和NOx（高达81.6％）的出水质量得到改善。根据当地电力公司的两种不同电价结构，与基准条件相比，估计最大成本节省为12800 USD mo-1至19000 USD mo-1。
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