A data analysis approach to evaluate the impact of the capacity utilization on the energy consumption of wastewater treatment plants

Torregrossa, Dario; Castellet-Viciano, Lledó; Hernández-Sancho, Francesc

doi:10.1016/j.scs.2018.11.036

Cited by 15 publications

(12 citation statements)

References 15 publications

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“…The regulation of the ASP variables is performed using the available control strategies: open-loop and simple ON-OFF and PI (Proportional Integral) feedback and feed-forward loops [20,21,24,25]. Some applications of advanced control strategies in real plants [26][27][28][29] and the development of decision support systems for WWTPs that uses online sensors and information from accessible data-bases to compute performance indicators associated with energy consumption [22,30] demonstrate that technical limitations to the implementation of control systems to improve the operation of WWTPs are being sorted out.…”

Section: Introductionmentioning

confidence: 99%

Wastewater Treatment Plant Operation: Simple Control Schemes with a Holistic Perspective

et al. 2020

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In this paper, a control approach for improving the overall efficiency of a wastewater treatment plant (WWTP) is presented. It consists of a cascaded control system that uses a global performance indicator as the controlled variable to drive the plant to operating conditions that satisfies trade-offs involved in the WWTP operation, improving the global performance of the plant. The selected global performance indicator is the N/E index that measures the ratio between the amount of nitrogenated compounds eliminated (kgN) and the energy (kWh) required to achieve that goal. This index links the variables of the activated sludge process with the energy consumed in the whole plant, thus the control strategy takes actions based on plantwide considerations. An external Proportional Integral (PI) controller changes the DO set point according to the N/E index and the basic dissolved oxygen (DO) control scheme in the activated sludge process follows this reference changes varying the aeration intensity. An outer loop with an event-based controller is used to compute the index values when the DO concentration is driven to excessively low limits, preventing long operation periods in this undesirable condition. Simple proportional integral controllers (PI) are used to adapt the strategy to the automation systems available in WWTPs. The implementation in the Benchmark Simulation Model 2 (BSM2) demonstrates the potential of the proposed approach. The results show the possibilities of the N/E index to be used as an indicator of global performance of WWTPs. It provides a link between water line objectives and energy consumption in the whole plant that can be exploited to introduce plantwide considerations in alternative control strategies formulated to drive the plant to operating conditions that optimize the overall process efficiency.

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Section: Introductionmentioning

confidence: 99%

Wastewater Treatment Plant Operation: Simple Control Schemes with a Holistic Perspective

et al. 2020

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“…In the proposed ammonium control scheme ( Figure 2), an external Proportional Integral (PI) loop manipulates DO set-point of the fourth ASP reactor, and the DO reference control system is the secondary control loop of cascade scheme. This strategy, named Default Strategy, reduces energy consumption with respect to [2,9], because the variation of the DO set-point is reduced to 1.0-2.5 g/m 3 . The PI controllers used in the cascaded ammonium control scheme are of the form:…”

Section: Plantwide Control Strategymentioning

confidence: 99%

“…Internal recycle flow-ASP (Q a -m 3 The knowledge of process behavior and process model, and the observation of preliminary simulation, make it possible to distinguish between slow dynamics control actions and faster dynamics control actions.…”

Section: Selection Of Control Actions To Improve Eco-efficiency Of Wwtpmentioning

confidence: 99%

“…The effluent quality is determined by the levels of pollutants in the effluent: Nitrogen (N tot ), ammonium (S NH ), nitrates (S NO ), total Chemical Oxygen Demand (COD), total Suspended Solids (TSS), and Biological Oxygen Demand (BOD5). The effluent quality requirements considered in this work, as are those given by the BSM2 platform [10,13,15]: N tot < 18 gN/m 3 , S NH < 4 gN/m 3 , COD <100 gCOD/m 3 , TSS < 30 g/m 3 .…”

Section: Performance Indicators and Energy Recoverymentioning

confidence: 99%

“…The urban wastewater treatment plants (WWTPs) comprise a water line, where pollutants are removed from wastewater, a sludge line, where sludge is stabilized while biogas is obtained as by-product, and a gas line for biogas conditioning [2]. In WWTPs facilities, efficiency of the process is determined by the amount of energy used to remove pollution [3]. Then, energy consumption and energy recovery from biogas are important issues to be considered in processes oriented to produce environmental benefits, since the use of energy from external sources to treat wastewater involve additional environmental impacts (i.e., emissions of greenhouse gasses, GHG).…”

Section: Introductionmentioning

confidence: 99%

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Eco-Efficiency Assessment of Control Actions in Wastewater Treatment Plants

Revollar

Meneses

Vilanova

et al. 2021

Water

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This work explores the possibilities of improving the eco-efficiency of Wastewater Treatment Plants (WWTPs) introducing a plant-wide perspective in the formulation of the control strategy. Eco-efficiency goals are contemplated in the analysis of the appropriateness of control actions, considering the seasonal effects of temperature into the decision-making process. Plant-wide control strategy handles are the operation variables of the activated sludge process, the volume of the primary clarifier, and the temperature of the anaerobic digester. Performance is evaluated in terms of energy use, biogas production, effluent quality, emissions to air and soil, considering annual and bimestrial average values of indicators to capture seasonal effect of temperature. The result is a set of possible solutions, obtained from a multi-objective decision-making procedure, consisting on a sequence of control actions applied at different temporal windows that improve the eco-efficiency indicators of the plant. The results obtained when applying the different solutions make evident how the application of plant-wide control strategies is useful to improve performance indicators that represent individual goals, leading to trade-off solutions that describe WWTPs’ eco-efficiency.

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Energetic and environmental analysis of a wastewater treatment plant through static and dynamic monitoring activities

Cicco

Spagnuolo

Masiello³

et al. 2020

Int. J. Environ. Sci. Technol.

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A data analysis approach to evaluate the impact of the capacity utilization on the energy consumption of wastewater treatment plants

Cited by 15 publications

References 15 publications

Wastewater Treatment Plant Operation: Simple Control Schemes with a Holistic Perspective

Wastewater Treatment Plant Operation: Simple Control Schemes with a Holistic Perspective

Eco-Efficiency Assessment of Control Actions in Wastewater Treatment Plants

Energetic and environmental analysis of a wastewater treatment plant through static and dynamic monitoring activities

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