A System Dynamics Model to Analyze Nitrate and Ammonia in Reservoirs and Lakes

Samaei, Mohammad Reza; Maleknia, Hoshang; Elhamiyan, Zahra; Isazadeh, Siavash

doi:10.17795/jjhs-33014

Cited by 2 publications

(5 citation statements)

References 16 publications

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“…They should, as a matter of simplicity, provide good information to decision makers. A good model should be powerful, adaptable, accessible, user friendly, cost effective and flexible (Samaei et al 2016b). In this research a mathematical model was developed to simulate the phosphorus in WSPs.…”

Section: Discussionmentioning

confidence: 99%

“…The model presented in this research discusses a simulation tool which estimates SRP in Yazd wastewater stabilization ponds based on the system dynamics approach. In order to simplify the model, the pond is considered as a continuous stirred rank reactor (CSTR) (Kehl et al 2009; Samaei et al 2016b). The structure of the actual model in detail as programmed into VenSim ® PLE 7.1.…”

Section: Methodsmentioning

confidence: 99%

“…The effect of temperature on chemical reactions can be investigated using various approaches. In the present study, the van’t Hoff-Arrhenius equation has been used (Samaei et al 2016b). Due to the large area of the pond, the study also considers the evaporation and precipitation factors, as they can affect the volume of the pond and other wastewater quality parameters.…”

Section: Methodsmentioning

confidence: 99%

“…Today, various models are used to model the removal of phosphorus from sewage (Eslami et al 2018b; Hauduc et al 2015; Mbamba et al 2016), but compelling environmental models should have special features to solve conflicts between institutions, groups and organizations that are involved in environmental quality. A good model must be powerful, adaptable and accessible (Mohammadi et al 2019; Samaei et al 2016b). Capabilities of such models include applicability, utilization of new sciences and competitive advantage (RadFard et al 2019; Samaei et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Developing a system dynamics model for prediction of phosphorus in facultative stabilization ponds

et al. 2019

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System dynamics is considered as a computer-aided approach to policy analysis and design. It includes the response and reaction of a system to external shocks. In the present research, following the sampling and testing phases, a system dynamics model was developed for modeling of phosphorus in facultative stabilization ponds. First, the scheme of soluble reactive phosphorous stock, its specifications and parameters were determined and created in the VenSim PLE 7.1 software. Then, mathematical relations were determined for each process. Finally, the model was calibrated and verified based on the data from the Yazd facultative ponds, Iran. Sensitivity analysis showed that the most important factors affecting phosphorus concentration in the ponds are the phosphorus settling rate, losses caused by algal respiration and excretion, while the losses caused by herbivorous zooplanktons, hydrolysis rate of inorganic carbon, and ratio of phosphorus to chlorophyll-a had the least importance. Results showed that, algal growth rate and phosphorus settling rate were important factors in phosphorus removal. Hence, with appropriate retention time in the pond, it can be managed more properly. The ratio of phosphorus to algae had less importance in the model. The ratio of carbon to phosphorus and rate of respiration of carnivorous zooplanktons did not affect the phosphorus concentration. It is recommended that this model can be used for pond management and overall assessment of facultative ponds.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Developing a system dynamics model for prediction of phosphorus in facultative stabilization ponds

et al. 2019

Self Cite

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“…From the Pearson correlation analysis, NH þ 4 showed negative correlation with NO À 3 (r ¼À0.28). This means that changes in NH þ 4 of water are associated with those in nitrates (NO À 3 ): when NH þ 4 decrease, an increase of NO À 3 take place because of the oxidation of ammonium to nitrates (after an intermediate stage of nitrites) in which a group of aerobic bacteria are involved (Reza Samaei et al, 2016). Strong positive correlations were found b e t w e e nF e ,M n ,C a ,M g ,P ba n dZ ns u c ha s :F e -M n( r ¼ 0.93), Fe-Ca (r ¼ 0.86), Fe-Zn (r ¼ 0.82), Mn-Ca (r ¼ 0.85) and Zn-Pb (r ¼ 0.83).…”

Section: Dippong Et Almentioning

confidence: 99%

Assessment of Water Physicochemical Parameters in the Strîmtori‐Firiza Reservoir in Northwest Romania

Dippong

Mihali

Năsui

et al. 2018

Water Environment Research

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This article assesses the surface water quality of the Strîmtori-Firiza reservoir by analyzing 14 physicochemical parameters among 9 metals in 18 sampling points. A series of possible reservoir pollutants were identified, depending on the nature of the pollutants and their loading. The novelty of the paper consists in the broad spectrum of investigations that includes spatial distribution cluster analysis and mathematical modeling. This article presents an innovative method of assessing the distributions of the metal loads as maps of metal distribution that are in accordance with the developed mathematical models that aim to present the pollutant distribution and the degree of correlation between the physicochemical indicators. The clusters were generated using Ward's and Nearest Neighbor methods that are less used in the studies concerning the analysis of water quality. Measures for maintaining the quality of the water reservoir are proposed considering the importance of the reservoir as source for drinking/industrial water.

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A System Dynamics Model to Analyze Nitrate and Ammonia in Reservoirs and Lakes

Cited by 2 publications

References 16 publications

Developing a system dynamics model for prediction of phosphorus in facultative stabilization ponds

Developing a system dynamics model for prediction of phosphorus in facultative stabilization ponds

Assessment of Water Physicochemical Parameters in the Strîmtori‐Firiza Reservoir in Northwest Romania

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