Sayed mahdi Rahmati Articles List

List of Articles Sayed mahdi Rahmati

Open Access Article
- Abstract Page
- Full-Text
1 - Simulating Water Quality of ARDAK River (Khorasan Razavi) using QUAL2KW
Morteza Nikakhtar Seyedeh Hoda Rahmati Ali reza Massah Bovani
10.22034/jest.2020.29264.3781

                      Background and Objective: Considering the importance of ARDAK River and dam in supplying drinking water of MASHHAD city as one of the biggest More

                      Background and Objective: Considering the importance of ARDAK River and dam in supplying drinking water of MASHHAD city as one of the biggest and most densely populated religious city of the world, preserving and maintaining water quality of this river is an essential task for providing water. This case study provides a model for water quality of ARDAK River by using appropriate and relevant tools which could calculate the values of water quality parameters along the entire length of main branches and it can be a beneficial approach for monitoring water responses to various contaminants and also for future decision making. Method: In this research QUAL2KW dynamic model has calibrated with available previous data (July 2014) and verified by results of field sampling which has been conducted in April 2016 for different aspects of water quality. Findings: Obtained results showed that this model made a good agreement with observed data such as DO, PH, COD and NO3 and it was able to simulate water quality for both river branches. Discussions and Conclusions: Abghad branch condition gets better due to less local population and contaminants, moreover agricultural, gardening and rural wastewater has affected both main branches of the river. Manuscript profile
Open Access Article
- Abstract Page
- Full-Text
2 - Impacts of droughts on environment flow (Case study: Minab River, Hormozgan, Iran)
Saeedeh Rostam Afshar Seyedeh Hoda Rahmati Hedayat Fahmi
10.30495/jest.2022.55583.5171

Background and Objective: One of the the most effective method to protect environment, is to know minimum amount of water required for environment at the right time. The aim of this study was to investigate the effects of drought on the environmental flow of Minab River More

Background and Objective: One of the the most effective method to protect environment, is to know minimum amount of water required for environment at the right time. The aim of this study was to investigate the effects of drought on the environmental flow of Minab River, in order to create environmental balance.Material and Methodology: Because of insufficient knowledge of different methods in Iran and their compatibility with management and climatic conditions of the country, after reviewing all available methods, the modified Montana and the flow continuity were selected as the optimal methods.Findings: After selecting the study area, flow discharge at the Brentin station in the Minab River during the years 1963 to 2017 were collected. Firstly, monthly average flow was calculated and later, annual average flow was determined which was equal to 8.16 cubic meters per second. Since the monthly average flow for October, November amd May to September are less than the annual average flow, they were considered as low water period and from December to April were considered as high water period. In the next step, river flow for low-water period and high-water period were calculated and equaled to 2.80 and 15.65 cubic meters per second respectively. Finally, based on different management classes, environmental flow of the Minab River using modified Montana method was calculated and equalled to 0.28 for the low water period and 1.56 for the high water period. Environmental flow with flow duration method equaled to 1.24 cubic meters per second.Discussion and Conclusion: The results reveals that, minimum flow to meet the environmental needs for the Minab River during low water period should be considered 0.28 and between 1.24 and 1.56 cubic meters per second at high water period repectively.  Manuscript profile
Open Access Article
- Abstract Page
- Full-Text
3 - Surface water Quality modeling using SWAT for ARDAk Basin of Mashhad
MORTEZA NIKAKHTAR Seyedeh Hoda Rahmati Ali reza Massah Bovani iman Babaeian
10.30495/jest.2022.64534.5573

Background and Objective: During last decades, despite developing various reports and techniques, due to over expansion of water pollution, hydrological models have become sophisticated tools for water resources management and planning because of their remarkable abilit More

Background and Objective: During last decades, despite developing various reports and techniques, due to over expansion of water pollution, hydrological models have become sophisticated tools for water resources management and planning because of their remarkable ability to analyze information and economic savings resulting from their application. In this study, using the SWAT semi-distributed model, which operates on the basis of physical and non-physical processes governing the water environment, quantitative and qualitative modeling was developed for Ardak River which supplies a significant part of water demand in drinking and agricultural sectors of Mashhad mega city. So, this research is going to provide a right tool for future planning and design making. Material and Methodology: After entering the information and constructing the model in Swat, for calibration and verification of stream flow, NO3, MINP, TSS, DO and CBOD in SWAT-CUP model, sampling and testing of different water quality parameters were performed in 12 monthly periods from march 2019 to February 2020. Findings: The results showed that except for nitrate, the amount of other water quality parameters such as phosphorus, sediment and carbonaceous organic matter is higher in wet seasons. Discussion and Conclusion: The developed model has a considerable ability to simulate the actual condition of the river and it can be applied to define and implement a variety of scenarios affecting water quality for identifying the best practices by testing different options. Manuscript profile
Open Access Article
- Abstract Page
- Full-Text
4 - Investigation of Effective Parameters on Starch Adsorption from Aqueous Solutions by Iron-Chitosan Nanoparticles
Khashayar Mohamadbeigy Amir hessam Hassani Seyedeh Hoda Rahmati amirhossein javid
10.30495/jest.2023.64368.5566

Background and Objective: Starch is widely used in food, pharmaceutical, paper & textile industry in large quantities. The wastewater of these units have high biological oxygen demand (BOD). In this study, the adsorption capacity of starch from aqueous solution was More

Background and Objective: Starch is widely used in food, pharmaceutical, paper & textile industry in large quantities. The wastewater of these units have high biological oxygen demand (BOD). In this study, the adsorption capacity of starch from aqueous solution was investigated using metal nanoparticles coated with chitosan. Due to the fact that chitosan biopolymer is non-toxic, biocompatible and biodegradable and also high adsorption capacity, degradability, stability, easily production and low cost, so the possibility of this nanoparticle can be considered in starch wastewater treatment. Material and Methodology: First, magnetic nanoparticles was and the structure characteristics and morphology of this nano particle were investigated. Then, the performance of nano-adsorbent and the effect of effective parameters on starch uptake, such as contact time, adsorbent, initial adsorbent concentration, temperature and pH of the solution, were studied. Finding: The results showed that it is possible the adsorption of starch with metal nanoparticles coated with chitosan. The maximum adsorption 84 present of starch is obtained at pH 5, contact time: 60 minutes and the dosage 2 mg of adsorbent per liter. According on experimental data are more compatible with the Langmuir isotherm than the Freundlich isotherm. The results also showed that these data follow a pseudo-second order kinetic model. Discussion and Conclusion: According to the results, although it is possible to reduce the amount of starch by using magnetic chitosan nanosorbent, but it is necessary to pilot and techno- economical study to investigate hybrid use with other conventional methods in treatment system of starch processing units. Manuscript profile

Current Issue

Published Issues

Menu

Browse

List of Articles Sayed mahdi Rahmati