Modeling Water Quality of Chitgar Lake: Evaluation of the Effectiveness of Various Water Treatment Scenarios on Lake Water Quality

Articles in Press

Document Type : Original Research Article

Authors

1 Department of Environmental Pollutants Research, Environmental Sciences Research Institute, Shahid Beheshti University, Tehran, Iran

2 Department of Geography and Urban Planning, Faculty of Humanities, Payame Noor University of Karaj, Alborz, Iran

3 Department of Environment, Natural Resources Faculty, Isfahan University of Technology, Isfahan, Iran

4 Department of Environmental Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Abstract

Chitgar Lake in Tehran city faces challenges in maintaining water quality due to nutrient loading and potential eutrophication. A water treatment plant (WTP) established in 2016 plays a crucial role in improving Chitgar Lake's water quality. The treatment process involves screening, coagulation, filtration, and disinfection, reducing TP to below 0.02 mg/L before releasing the water into the lake. A water quality model was developed to assess the impacts of external and internal nutrient and organic loading on lake management. This study investigates the impact of different WTP operational scenarios on water quality parameters using a water quality model. The results show that the lake experiences water quality issues, with a minimum DO level of 3.96 mg/L and maximum TP and Chl-a levels exceeding standard levels. The river water undergoes significant improvements after treatment, with nutrient reductions, Chl-a, and turbidity. The study highlights the critical need for continuous monitoring and effective treatment strategies to maintain Chitgar Lake's water quality well above standard conditions. The model serves as a valuable tool for assessing management strategies and optimizing water treatment plant operations, helping to control eutrophication and preserve the lake's recreational value. The simulation scenarios indicate that the most effective strategy for maintaining water quality in Chitgar Lake is the continuous operation of the water treatment plant during both the refilling and recycling periods. This approach successfully keeps key parameters, such as Chl-a and TP, within acceptable limits, effectively preventing eutrophication and ensuring the lake's suitability for recreational activities.

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Sustainable Earth Trends

Articles in Press, Accepted Manuscript
Available Online from 01 January 2025

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