Computer Simulation in Predicting Biochemical Processes and Energy Balance at WWTPs

Drewnowski, Jakub; Zaborowska, Ewa; Vega, Carmen Hernández de

doi:10.1051/e3sconf/20183003007

Cited by 7 publications

(10 citation statements)

References 12 publications

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“…RAS was also discovered to be a major factor in energy consumption as higher RAS resulted in higher energy requirements. This complies with the findings of Drewnowski et al, (2018). In contrast, aluminum sulfate was precipitated to complement the anaerobic tank in phosphorus removal.…”

Section: Model Calibration and Validationsupporting

confidence: 91%

“…DO concentrations were found to have a critical role in effluent quality and energy consumption (Drewnowski et al, 2018;Cao et al, 2021;Daskiran et al, 2022). In particular, Cao et al, (2021) found that nitrogen removal was significantly increased by lowering the DO.…”

Section: Discussionmentioning

confidence: 99%

“…They found that using this protocol and under the optimized conditions, the differences in COD and TN concentrations between the calibrated and experimental data were reduced, however, the concentrations were still slightly different. Furthermore, Drewnowski et al, (2018) used GPS-X to predict energy output considering three different scenarios in which different variables were modified. The first scenario revealed that a 40% increase in suspended solids removal led to a 25% increase in biogas volume.…”

Section: Computer Simulation Of Wwtpsmentioning

confidence: 99%

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Comparative Environmental and Economic Assessment of the Zahle Wastewater Treatment Plant in Lebanon under Different Scenarios. (c2022)

Ghosn¹

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Assessing the environmental impacts of wastewater treatment plants (WWTPs) is a growing concern that needs to be addressed. Although several studies have been published on the environmental performance of WWTPs, few have been reported from developing countries, especially in Lebanon. In this study, the environmental and economical performance of an oxidation ditch-based secondary treatment technology in Zahle, Lebanon, was evaluated using life cycle assessment (LCA) and life cycle cost (LCC) in conjunction with computer modeling. The current plant was calibrated and validated using GPS-X v. 8.0 software and three hypothetical scenarios were suggested and compared with its current state. The first scenario (S1) included adding anaerobic sludge digestion. The second scenario (S2) included using extended aeration. The third scenario (S3) included using a five-stage Bardenpho (FSB) process. For this purpose, a series of LCAs were performed using SimaPro 9.3.0.3 together with the ecoinvent 3.8 database, and the ReCiPe midpoint (H) and endpoint (H/A) methodologies. A functional unit of 1 m3 of treated wastewater was used as a basis. The WWTPs costs were estimated using the CapdetWorks v4.0 software. Further, LCA was monetized using external costs. The analysis revealed that the environmental categories were primarily influenced by energy consumption. The current plant had a global warming effect of 0.678 kgCO2 eq/m3. Normalized results showed that the first scenario was the most environmentally friendly alternative in the human carcinogenic toxicity impact category quantified as follows: S2 < S0 < S3 < S1. Normalized results also showed that freshwater ecotoxicity and human carcinogenic toxicity were the main impact categories. The economic evaluation revealed that the addition of anaerobic digestion led to more expenses, while S0 process was found to be the most cost-effective. The descending order concerning environmental costs was as follows: S2(0.171$/m3) > S0(0.159$/m3) > S3 (0.147$/m3) > S1 (0.117$/m3). Considering the collective evaluation, scenario S1 was chosen as a potential enhancement for the Zahle WWTP (ZWWTP). This study emphasized the importance of the environmental impact assessment in the wastewater treatment (WWT) sector and contributed to the growing body of literature related to WWT in Lebanon. Further research is needed to provide a clear data collection process that will increase the modeling precision of an existing plant and accurately reflect the outcomes.

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Section: Model Calibration and Validationsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Computer Simulation Of Wwtpsmentioning

confidence: 99%

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Comparative Environmental and Economic Assessment of the Zahle Wastewater Treatment Plant in Lebanon under Different Scenarios. (c2022)

Ghosn¹

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“…Presently, there has been a strong demand for the application of mathematical models for the simulation of wastewater treatment processes in full-scale WWTPs [10]. By using computer simulation and advanced programs, it is possible to create a mathematical model of a real WWTP, run a simulation and subsequently interpret results under various conditions without interfering in the actual process performance [11]. Regardless of the process complexity, plant-wide modeling of WWTPs can be used as a base for future applications, optimization studies, or for developing a process for achieving the highest effluent quality levels and energy savings [12].…”

Section: Introductionmentioning

confidence: 99%

Modeling and calibration of a full-scale wastewater treatment plant using GPS-X model (A case study of Tehran)

Moghaddam

Pirali

2021

NMCE

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Wastewater treatment plants (WWTPs) play a significant role in sustainability due to integration of resource recovery and health management during clean water production. Mathematical modeling has become a vital tool for sustainable wastewater management, especially for simulating complex procedures involved in activated sludge processes. Wastewater process modeling provides more options for upgrades and improvements of operational controls. In this paper, a systematic approach was undertaken to create a plantwide model for a full-scale plant located in Tehran, Iran, namely the Southern Tehran WWTP, using GPS-X software. The characterization of the influent composition to satisfy the mass balance is the most critical step of modeling, which can have significant influence on simulation accuracy. Therefore, the influent wastewater was initially characterized and carefully analyzed carefully. Then, the model has been calibrated followed by model validation using the collected data. For calibration of the model, the sensitivity of various stoichiometric and kinetic parameters in the GPS-X was analyzed and screened. In this regard, the average absolute relative error was employed to show the agreement between the simulated and measured values. Finally, the calibrated model was validated using the actual input and output data. The results indicate that the model's accuracy was acceptable, and therefore the developed model can be applied for future studies.

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“…Models can be used to predict the system response to the appearance of disturbances as well as visualize the effects of configuration changes on the system performance without actually interfering with the system. Nowadays, mathematical modeling of MBR is considered to be an inherent part of the process of designing and managing real objects [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Wastewater Treatment Processes in Membrane Bioreactors Compared to Conventional Activated Sludge Systems

et al. 2019

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Membrane techniques constitute an interesting alternative to conventional activated sludge systems (CAS). In membrane bioreactors (MBR), the biomass separated on membranes is retained independently of sludge sedimentation properties. As a consequence, a high biomass concentration as well as low food to microorganisms ratio can be obtained. Moreover, the development of a characteristic activated sludge population is stimulated by the specific conditions prevailing in MBRs. In the study, the operation and treatment efficiency of the MBR and CAS processes were examined and compared. Simulation was performed with the use of GPS-X software. The effluent quality obtained for the MBR system was either better or comparable to that of CAS. The most significant difference concerned the elimination of total suspended solids, which amounted to 99.8% in the MBR. Regarding nutrients, a low concentration of total phosphorus in the effluent from CAS and MBR was obtained (0.67 gP m−3 and 0.50 gP m−3, respectively). Greater differences were achieved in the case of total nitrogen. Although almost complete nitrification took place in both systems, a lower concentration of nitrate in the effluent from MBR in comparison to CAS, i.e., 11.2 gN m−3 and 14.1 gN m−3, respectively, allowed us to obtain a higher removal of total nitrogen (80.8% and 76.1%, respectively).

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Computer Simulation in Predicting Biochemical Processes and Energy Balance at WWTPs

Cited by 7 publications

References 12 publications

Comparative Environmental and Economic Assessment of the Zahle Wastewater Treatment Plant in Lebanon under Different Scenarios. (c2022)

Comparative Environmental and Economic Assessment of the Zahle Wastewater Treatment Plant in Lebanon under Different Scenarios. (c2022)

Modeling and calibration of a full-scale wastewater treatment plant using GPS-X model (A case study of Tehran)

Modeling of Wastewater Treatment Processes in Membrane Bioreactors Compared to Conventional Activated Sludge Systems

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