Mohammad Reza Samarghandi

Hamedan University of Medical Sciences

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Alireza Rahmani

Hamedan University of Medical Sciences

Ghorban Asgari

Hamedan University of Medical Sciences

Reza Shokoohi

Hamedan University of Medical Sciences

Abdollah Dargahi

Ardabil University of Medical Sciences

Davood Nematollahi

Bu-Ali Sina University

Mansur Zarrabi

Malayer University

Mehdi Shirzad‐Siboni

Guilan University of Medical Sciences

Mohammad Noori Sepehr

Alborz University of Medical Sciences

Mohammad Taghi Samadi

Hamedan University of Medical Sciences

Jamal Mehralipour

Iran University of Medical Sciences

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Hamedan University of Medical Sciences

131

John Wiley & Sons (United States)

Hudson Institute

Tehran University of Medical Sciences

Tarbiat Modares University

University of Tehran

Kermanshah University of Medical Sciences

Bu-Ali Sina University

Kurdistan University of Medical Sciences

Ardabil University of Medical Sciences

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Exposure of the static magnetic fields on the microbial growth rate and the sludge properties in the complete-mix activated sludge process (a pilot-scale study)

Research Square (Research Square) (2023)

Ghorban Asgari Abdolmotaleb Seid‐Mohammadi Reza Shokoohi Mohammad Reza Samarghandi Glen T. Daigger

Abstract In this study, the effect of static magnetic fields (SMFs) on improving the performance of activated sludge to enhance the microbial growth rate and improve sludge settling characteristics in real operation conditions has been investigated. The effect of SMFs (15 mT), hydraulic retention time, sludge age, aeration time on mixed liquor suspended solids (MLSS), mixed liquor volatile suspended solids (MLVSS), α-factor, and pH in the complete-mix activated sludge (CMAS) process during 30 days of operation were evaluated. There were not any differences between the concentration of MLSS in the case and control samples, however, the mean concentration of MLVSS in the case (1463.4 ± 419.2 mg/L) was more than the control samples (1244.1 ± 295.5 mg/L). Changes of the concentration of MLVSS over time, follow the first and second-order reaction with and without exposure to SMFs respectively. however, the slope of the line in the case samples was 6.255 higher than in the control samples. The mean of α-factor in the case samples increased by -0.001 higher than in the control samples. Changes in pH in both groups of the reactors were not observed. 15 mT intensity of SMFs can promote oxygen transfer to the biomass and, increase the concentration of MLVSS in aeration reactor of CMAS. SMFs have a potential to consider as an alternative method to stimulate the microbial growth rate in the aeration reactor and produce bioflocs with higher density in CMAS.

Volatile suspended solids

Settling

10.21203/rs.3.rs-2978013/v1

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Survey the Efficiency of Catalytic Ozonation Process with Carbosieve in the Removal of Benzene from Polluted Air Stream

Majallah-i 'ilmī-i dānishgāh-i 'ulūm-i pizishkī va khadamāt-i bihdāshtī darmānī-i Hamadān (2014)

Mohammad Reza Samarghandi Azadeh Babaee G H Asgari Farshid Ghorbani Shahna

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Removal of Nitrate by Zero Valent Iron in the Presence of H2O2

Alborz University Medical Journal (2014)

Mohammad Reza Samarghandi S.M. Tabatabai Mohammad Noori Sepehr E. Mohammadi Kalhori M. Zarrabi

Zerovalent iron

Zero (linguistics)

10.18869/acadpub.aums.3.1.40

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Citations (0)

Issue Information

Water Environment Research (2020)

Yang Deng Joseph Wickline Leslie Hopkinson J. L. Jiménez George Wise

Trichloroethylene degradation performance in aqueous solution by Fe(II) activated

10.1002/wer.1117

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Catalytic ozonation of ethyl benzene using modified pumice with magnesium nitrate from polluted air

International Journal of Environmental Studies (2017)

Mohammad Reza Samarghandi Zahra Daraee Balendu Shekher Giri Ghorban Asgari Alireza Rahmani

This paper reports a novel technology developed for a Catalytic Ozonation Process (COP) to treat polluted air streams containing ethyl benzene. Raw pumice was modified with magnesium nitrate, and then used as a catalyst in the COP. The best removal efficiency of ethyl benzene for single ozonation and single modified pumice was 58–80%, respectively at 50 ppm of this pollutant, while the maximum removal efficiency of ethyl benzene was 90% for COP (6 L/min of flow rate of inlet air, 15 g of the adsorbent, and 50 ppm of ethyl benzene). The saturation and breaking point of the catalyst in low concentrations occurred after 12 h, which was later than single ozonation. According to the results obtained, pumice modified with magnesium can be used as a cost effective, efficient and suitable catalyst to treat polluted air containing volatile organic compounds in the oil refining industries.

Pumice

Magnesium nitrate

10.1080/00207233.2017.1316042

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Electro-peroxymonosulfate processes for the removal of humic acid from aqueous media

Biomass Conversion and Biorefinery (2022)

Abdollah Dargahi Roya Aazami Gilan Mohammad Reza Samarghandi Hassan ZolghadrNasab Fatemeh Karimi

Central composite design

Aqueous medium

10.1007/s13399-022-03142-4

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Citations (9)

Electrodegradation of tetracycline using stainless steel net electrodes: Screening of main effective parameters and interactions by means of a two-level factorial design

Korean Journal of Chemical Engineering (2017)

Maryam Foroughi Hamid Reza Soheil Arezoomand Alireza Rahmani Ghorban Asgari Davood Nematollahi

Pareto chart

Fractional factorial design

Design of experiments

Supporting electrolyte

Central composite design

Split plot

Sodium sulfate

10.1007/s11814-017-0212-0

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Citations (29)

Kinetic of degradation of two azo dyes from aqueous solutions by zero iron powder: determination of the optimal conditions

Desalination and Water Treatment (2012)

Mohammad Reza Samarghandi Mansur Zarrabi Abdeltif Amrane Mohammad Noori Sepehr Mehdi Noroozi

The textile industry induces one of the main environmental pollution, mainly due to the dyes containing in its effl uents.There is therefore a need for their treatment prior to discharge to the environment.The removal effi ciency of Acid Red 18 and Acid Red 14 dyes by zero-valent iron were investigated in this study.The effect of some parameters such as pH (3-11), contact time (15-120 min), initial dye concentration (25-100 mg l -1 ) and initial concentration of iron powder (0.5-2 g l -1 ) were examined.The results showed that dye removal effi ciency increased with increasing contact time and initial concentration of iron powder on the one hand, and decreased for increasing pH and initial dye concentration on the other hand.Experimental data were rather accurately fi tted onto both fi rst-order and second-order kinetic models, even if the fi rst-order kinetic model led to higher correlation coeffi cients.Comparison of the kinetic rate constants showed a low impact of the initial dye concentration and that an acidic pH of 3 was optimal for the removal of Acid Red 14 and Acid Red 18.

Degradation

Acid dye

Congo red

Zerovalent iron

10.5004/dwt.2012.2746

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Citations (21)

Optimization and modeling of the three-dimensional electrochemical process in the removal of ciprofloxacin from aqueous media with a central composite design

Desalination and Water Treatment (2021)

Reza Shokoohi Mohammad Reza Samarghandi J. Faredmal Abbas Moradi Behgoo

Antibiotics cause many environmental problems due to bioaccumulation, drug resistance, and environmental stability.This study aimed to investigate the efficiency of a three-dimensional electrochemical process with aluminum electrodes (3D-ECPWAE) to remove ciprofloxacin from aqueous media.Furthermore, the effect of main operating parameters as independent variables (initial pH, pollutant concentration, current density, and electrolyte concentration) on ciprofloxacin (CIP) degradation efficiency as response variables was investigated and optimized by central composite design.The initial results were analyzed and optimized using Minitab 17.The confirmatory tests were performed at optimum conditions and the process efficiency to reduce CIP concentration, chemical oxygen demand (COD), and total organic carbon (TOC).These results indicate that under the optimum condition, the maximum CIP, COD, and TOC removal efficiency was 86.72%, 48.04%, and 45.45%, respectively.The optimal values of the variables for CIP concentration, pH, current intensity, and electrolyte concentration were 80 mg/L, 5.8, 0.75, and 0.4 g/L at the optimum time (30 min).According to the results, the acceptable efficiency of the 3D-ECPWAE for CIP removal was at a relatively high concentration at an appropriate time.

Central composite design

Aqueous medium

10.5004/dwt.2021.27765

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Removal of Acid Red 14 by Pumice Stone as a Low Cost Adsorbent: Kinetic and Equilibrium Study

DOAJ (DOAJ: Directory of Open Access Journals) (2012)

Mohammad Reza Samarghandi Mansur Zarrabi Mohammad Noori Sepehr Reza Panahi Maryam Foroghi

In this work, removal of C. I. Acid Red 14 was investigated by Pumice stone as a low cost adsorbent. Various parameters such as initial dye solution, contact time and pH were studied. Removal of dye were increased by increasing of contact time and initial dye solution and deceased by increasing of pH. Three isotherm models were studied. Linear and non-linear regression analyses were used for determination of best isotherm model. In addition, Chi-square test parameter (χ2) was used for the comparison of experimental and calculated data that was obtained from equilibrium studies. The results of linear and non-linear regression analysis shows the removal of Acid Red 14 follows the Frundlich isotherm model (r2>0.987, X2=11.1). Fitting of obtained data onto kinetic models show the pseudo second order kinetic model best describe kinetic sorption of Acid Red 14 onto pumice. Mass transfer coefficient was determined at various initial dye solutions and was compared with the same work. The order of external mass transfer coefficient was 10-3-10-4. De-sorption studies demonstrate low regeneration of pumice for Acid Red 14 (9.4%).

Pumice

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