Numerical modelling of hydraulic efficiency and pollution transport in waste stabilization ponds

Goodarzi, Danial; Mohammadian, Abdolmajid; Pearson, Jonathan; Abolfathi, Soroush

doi:10.1016/j.ecoleng.2022.106702

Cited by 45 publications

(12 citation statements)

References 57 publications

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“…Additionally, he has addressed the research of various scholars who have studied the influence of BWs on WSPs. Another observation by Goodarzi et al [11] is that the hydraulic and treatment efficiency of WSPs also improves with the addition of BWs. Therefore, their presence increases the efficiency of wastewater treatment by providing plug flow.…”

Section: Introductionmentioning

confidence: 91%

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Mathematical modeling and optimization of wastewater stabilization ponds using nonlinear programming

Ali

Üçüncü

2023

Mehran Univ. res. j. eng. technol.

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This research work proposes a mathematical optimization model for constructing two ponds (1. Facultative pond and 2. Maturation pond) provided in series. The model uses concrete volume as its objective minimization function. There were two decision variables; the first was the detention time (DT) and the second in the list was the number of provided baffle walls (NBW) in both ponds. The constraint parameters include fecal coliforms and biochemical oxygen demand (BOD5). The model was applied with the help of an Add-Ins of MS Office: Excel solver. The generalized reduced gradient algorithm was utilized in the solver (GRG). Before applying the mathematical optimization model, ponds were designed with the conventional method and then using optimized values of the variables. A comparison of the findings reveals that a 13.79 percent reduction in the DT, an 11.55 percent reduction in the area, and a 7.19 percent reduction in the volume of concrete occurred. The reduction values mentioned above are significant since these systems' fundamental drawback is the area's requirement. In addition, sensitivity analyses of the objective function and the removal of pollutants are also provided. The model described above is sensitive to variations in the parameters. Both analyses demonstrated that the effluent characteristics comply with the class-B irrigation standards in Turkey. It is advised to do more optimization studies for WSPs with the help of other algorithms and tools available in the literature for distinct wastewater treatment plants.

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Section: Introductionmentioning

confidence: 91%

“…Goodarzi et al [11] claim that baffle walls (BWs) in pond systems can improve flow conditions, reduce dead sections in the ponds, and enhance pollution removal efficiency. Several studies have been conducted to check their effectiveness at various numbers and lengths.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling and optimization of wastewater stabilization ponds using nonlinear programming

Ali

Üçüncü

2023

Mehran Univ. res. j. eng. technol.

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“…Currently, the capacity (volume) of the Legon STP has been scaled up to about 66% through trucked-in waste, and this increased capacity was expected to improve the clearance of E. coli and other bacteria. This is because wastewater stabilisation pond performance can be influenced by hydraulic performance, short-circuiting, sludge accumulation, and flow velocities [ 15 ]. We believed that it would, therefore, be useful to compare the efficiency of the treatment plant five years later to determine whether the overall bacterial load in the effluent was reduced further and to see how antibiotic resistance patterns had evolved since 2018.…”

Section: Introductionmentioning

confidence: 99%

Assessing Changes in Bacterial Load and Antibiotic Resistance in the Legon Sewage Treatment Plant between 2018 and 2023 in Accra, Ghana

Adjei,

Adomako,

Korang-Labi

et al. 2023

TropicalMed

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Wastewater treatment plants are efficient in reducing bacterial loads but are also considered potential drivers of environmental antimicrobial resistance (AMR). In this study, we determined the effect of increased influent wastewater volume (from 40% to 66%) in the Legon sewage treatment plant (STP) on the removal of E. coli from sewage, along with changes in AMR profiles. This before and after study compared E. coli loads and AMR patterns in influent and effluent samples from a published baseline study (January–June 2018) with a follow-up study (March–May 2023). Extended-spectrum beta-lactamase (ESBL) E. coli were measured pre- and post-sewage treatment during the follow-up study. The follow-up study showed 7.4% and 24% ESBL E. coli proportions in influent and effluent, respectively. In both studies, the STP was 99% efficient in reducing E. coli loads in effluents, with no significant difference (p = 0.42) between the two periods. More E. coli resistance to antimicrobials was seen in effluents in the follow-up study versus the baseline study. The increased influent capacity did not reduce the efficiency of the STP in removing E. coli from influent wastewater but was associated with increased AMR patterns in effluent water. Further studies are required to determine whether these changes have significant effects on human health.

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“…According to Goodarzi et al [7], baffle walls (BWs) in pond systems improve flow conditions, eliminate dead spots, and enhance pollution removal efficiency. So far, there have been studies about stabilization pond systems, including different numbers and lengths of BWs.…”

Section: Introductionmentioning

confidence: 99%

“…He has also discussed the works of multiple authors who worked on the effect of BWs. Goodarzi et al [7] discussed that the BWs increase the efficiency of the hydraulic system in WSPs. Their addition helps the piston flow and, therefore, increases the efficiency of wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the amount of concrete for the construction of wastewater stabilization ponds: A case study of Ayvadere, Trabzon, Türkiye

Ali

Üçüncü

2022

Environmental Research and Technology

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Natural systems are a cost-effective way to clean wastewater from small communities. This paper aims to use an optimization technique to minimize the volume of concrete needed to construct a facultative pond provided within a series of three ponds. A nonlinear constrained optimization model was written and then solved using one of the Add-Ins of MS office. The add-in used was Excel Solver, and the algorithm was generalized reduced gradient (GRG). Before applying the optimization model, wastewater stabilization ponds (WSPs) were designed using various configurations and arrangements. The best possible configuration that gave minimum area and hydraulic detention time was selected for the study area. Afterward, the optimization model was applied that further reduced the area by 11.46 %, hydraulic detention time by 11.47%, and concrete volume by 6.94% compared to the traditional approach. In both methods, effluents satisfy the Turkish class-B standards for irrigation. It is recommended that a small-scale application of the model be made to compare the results before applying it on a large scale.

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Numerical modelling of hydraulic efficiency and pollution transport in waste stabilization ponds

Cited by 45 publications

References 57 publications

Mathematical modeling and optimization of wastewater stabilization ponds using nonlinear programming

Mathematical modeling and optimization of wastewater stabilization ponds using nonlinear programming

Assessing Changes in Bacterial Load and Antibiotic Resistance in the Legon Sewage Treatment Plant between 2018 and 2023 in Accra, Ghana

Optimizing the amount of concrete for the construction of wastewater stabilization ponds: A case study of Ayvadere, Trabzon, Türkiye

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