University of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Investigation into the Effect of Residual Stresses on the Performance of Corrugated Trapezoidal Steel Shear PanelsInvestigation into the Effect of Residual Stresses on the Performance of Corrugated Trapezoidal Steel Shear Panels1121591910.22034/ceej.2023.53385.2181FAVahidAmiriFaculty of Civil Engineering, Sahand University of Technology, Tabriz, IranArashAkbari HamedFaculty of Civil Engineering, Sahand University of Technology, Tabriz, IranKarimAbediFaculty of Civil Engineering, Sahand University of Technology, Tabriz, IranJournal Article20220909In the present study, the effect of residual stresses on the performance of braced corrugated steel shear panels (Akbari Hamed and Mofid, 2015a; 2015b; 2015c; 2016; 2017; Amiri et al., 2023) was investigated using numerical modeling, and its results were presented. For this purpose, after validating the finite element modeling method by ABAQUS software, the effect of considering the residual stress on the performance of 12 steel shear panel models with different sizes of sub-panel width, the corrugation angle and the panel thickness was investigated by evaluating some important parameters such as the initial stiffness, the dissipated energy and the strength.In the present study, the effect of residual stresses on the performance of braced corrugated steel shear panels (Akbari Hamed and Mofid, 2015a; 2015b; 2015c; 2016; 2017; Amiri et al., 2023) was investigated using numerical modeling, and its results were presented. For this purpose, after validating the finite element modeling method by ABAQUS software, the effect of considering the residual stress on the performance of 12 steel shear panel models with different sizes of sub-panel width, the corrugation angle and the panel thickness was investigated by evaluating some important parameters such as the initial stiffness, the dissipated energy and the strength.https://ceej.tabrizu.ac.ir/article_15919_7b905585c6bedf21454a71d3adeb610b.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Cyclic Behavior of Hybrid Honeycomb-and-Flexural Yielding Dampers in Chevron CBFsCyclic Behavior of Hybrid Honeycomb-and-Flexural Yielding Dampers in Chevron CBFs13241616910.22034/ceej.2023.54590.2208FABahmanJafariFaculty of Civil Engineering, Urmia University of TechnologyBehzadShekastehbandFaculty of Civil Engineering, Urmia University of TechnologyJournal Article20221224Concentrically braced frames (CBFs) enables high lateral strength and elastic stiffness in comparison with other common systems such as eccentrically braced frames (EBFs) and moment-resisting frames (MRFs). Despite the advantages of the CBF systems, they do not provide considerable seismic energy dissipation capacity due to buckling of the braces under compressive loads. Various types of control systems, such as, friction dampers, viscoelastic dampers, metallic yielding dampers, and etc. have been proposed to mitigate the destructive action of earthquakes on buildings. Among these dampers, metallic yielding dampers are the simplest, cost-effective and easy to fabricate. Among the different metallic yielding dampers, steel plate yielding fuses are the most efficient devices which have been extensively studied by researchers. ADAS is a type of flexural dampers in which the hysteretic energy is achieved through the flexural yielding of steel plates. However, this type of damper suffers from the relatively low initial stiffness (Xia and Hanson 1992). Another type of metallic dampers is the shear link which relies on the inelastic shear deformation of metallic plates under the in-plane loading and offers high initial stiffness and stable energy dissipation (Bakhshayesh et al. 2021). A new shear damper, known as honeycomb structural fuse (HSF), was proposed and developed. The energy dissipation potential of such devices can be improved if the metallic plates are so oriented that they can undergo combined flexure and shear deformation under the action of lateral loading. In this study, a combined honeycomb-and-flexural yielding dampers are proposed as passive energy dissipation systems.Concentrically braced frames (CBFs) enables high lateral strength and elastic stiffness in comparison with other common systems such as eccentrically braced frames (EBFs) and moment-resisting frames (MRFs). Despite the advantages of the CBF systems, they do not provide considerable seismic energy dissipation capacity due to buckling of the braces under compressive loads. Various types of control systems, such as, friction dampers, viscoelastic dampers, metallic yielding dampers, and etc. have been proposed to mitigate the destructive action of earthquakes on buildings. Among these dampers, metallic yielding dampers are the simplest, cost-effective and easy to fabricate. Among the different metallic yielding dampers, steel plate yielding fuses are the most efficient devices which have been extensively studied by researchers. ADAS is a type of flexural dampers in which the hysteretic energy is achieved through the flexural yielding of steel plates. However, this type of damper suffers from the relatively low initial stiffness (Xia and Hanson 1992). Another type of metallic dampers is the shear link which relies on the inelastic shear deformation of metallic plates under the in-plane loading and offers high initial stiffness and stable energy dissipation (Bakhshayesh et al. 2021). A new shear damper, known as honeycomb structural fuse (HSF), was proposed and developed. The energy dissipation potential of such devices can be improved if the metallic plates are so oriented that they can undergo combined flexure and shear deformation under the action of lateral loading. In this study, a combined honeycomb-and-flexural yielding dampers are proposed as passive energy dissipation systems.https://ceej.tabrizu.ac.ir/article_16169_fe070eae709856c2405dbcb51cb1879c.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Spatial Assessment of Risky and Safe Sites for Solid Waste Landfills (Case study: Isfahan Province, Iran)Spatial Assessment of Risky and Safe Sites for Solid Waste Landfills (Case study: Isfahan Province, Iran)25341614510.22034/ceej.2023.53750.2191FAAliDehnaviDepartment of Civil Engineering, Faculty of Civil Engineering and Transportation, University of Isfahan, IranSaeedNadiDepartment of Geomatics Engineering, Faculty of Civil Engineering and Transportation, University of Isfahan, IranShervinJamshidiDepartment of Civil Engineering, Faculty of Civil Engineering and Transportation, University of Isfahan, IranJournal Article20221016According to the estimations, about 80% of municipal and rural solid waste in Iran is disposed in landfills. This rate is similar to some countries like Greece or Croatia in Eastern Europe. However, there is a pivotal tendency, particularly among industrialized and developed countries like Germany, Japan, Belgium and Netherlands, to reduce the rate of landfilling solid wastes less than 1% through the recycling, composting and reuse (EEA, 2016). The European Union has set 10% as its vision for limiting the rate of solid waste landfills by 2035. Despite the will of reducing solid waste landfills worldwide, its application is inevitable, particularly in developing countries like Iran. Therefore, spatial analysis and zoning safe areas is the primary step for protecting the environment against the pollutions in these sites.<br />In the last decade, there are quite numerous researches that aimed on optimizing the location of landfills through the combination of multi criteria decision making and spatial analysis tools, like geographic information systems (GIS) (Özkan et al. 2020; Şimşek and Alp, 2022). However, they were usually confined to a city area, used a few criteria, and emphasized to specific case studies. This conventional approach can highlight the locations where landfills might have the least environmental risks in a small scale. In addition, the accumulation of these researches can highlight some critical criteria and geographic layers. Although, we believe that in larger scales, optimizing the locations of landfills should be finalized by detailed quantified environmental impact assessment, like life cycle assessment (LCA) (Kumar et al. 2020). Prior to any technical decisions, a spatial survey is required to filter the risky regions for zoning landfills.<br />This study uses GIS tool with 70 layers and criteria to classify the large area of Isfahan province, centre Iran, into risky and safe zones. Accordingly, the status of existing 210 solid waste landfills, disposal stations, and facilities are checked based on national guidelines and regulations. Here, the states and cities with the highest environmental violations are highlighted.According to the estimations, about 80% of municipal and rural solid waste in Iran is disposed in landfills. This rate is similar to some countries like Greece or Croatia in Eastern Europe. However, there is a pivotal tendency, particularly among industrialized and developed countries like Germany, Japan, Belgium and Netherlands, to reduce the rate of landfilling solid wastes less than 1% through the recycling, composting and reuse (EEA, 2016). The European Union has set 10% as its vision for limiting the rate of solid waste landfills by 2035. Despite the will of reducing solid waste landfills worldwide, its application is inevitable, particularly in developing countries like Iran. Therefore, spatial analysis and zoning safe areas is the primary step for protecting the environment against the pollutions in these sites.<br />In the last decade, there are quite numerous researches that aimed on optimizing the location of landfills through the combination of multi criteria decision making and spatial analysis tools, like geographic information systems (GIS) (Özkan et al. 2020; Şimşek and Alp, 2022). However, they were usually confined to a city area, used a few criteria, and emphasized to specific case studies. This conventional approach can highlight the locations where landfills might have the least environmental risks in a small scale. In addition, the accumulation of these researches can highlight some critical criteria and geographic layers. Although, we believe that in larger scales, optimizing the locations of landfills should be finalized by detailed quantified environmental impact assessment, like life cycle assessment (LCA) (Kumar et al. 2020). Prior to any technical decisions, a spatial survey is required to filter the risky regions for zoning landfills.<br />This study uses GIS tool with 70 layers and criteria to classify the large area of Isfahan province, centre Iran, into risky and safe zones. Accordingly, the status of existing 210 solid waste landfills, disposal stations, and facilities are checked based on national guidelines and regulations. Here, the states and cities with the highest environmental violations are highlighted.https://ceej.tabrizu.ac.ir/article_16145_9737b727af2f26b646e3f8b23a1489a6.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Robust Analysis of the Designed Controller Based on the Critically Damped ConditionRobust Analysis of the Designed Controller Based on the Critically Damped Condition35511631210.22034/ceej.2023.54903.2215FAHosseinGhaffarzadehFaculty of Civil Engineering, University of TabrizAlirezaAranFaculty of Civil Engineering, University of Tabriz,. Tabriz. IranJavadKatebiFaculty of Civil Engineering, University of Tabriz,. Tabriz. IranJournal Article20230114 In this research, the robustness of the controller designed based on the critically damped condition (CD) is evaluated against parametric uncertainty, time delay, sensor/actuator faults, and the failure of the actuators. Then, robust controllers are designed in different conditions and the results are compared with the CD method. Linear matrix inequalities and Lyapunov theory are used to design the controllers, and due to the fact that sparse and large matrices arise in the process of solving, the problem is suboptimally solved. Therefore, Yalmip toolbox and Mosek<sup>®</sup> solver are used for this purpose. In this research, the robustness of the controller designed based on the critically damped condition (CD) is evaluated against parametric uncertainty, time delay, sensor/actuator faults, and the failure of the actuators. Then, robust controllers are designed in different conditions and the results are compared with the CD method. Linear matrix inequalities and Lyapunov theory are used to design the controllers, and due to the fact that sparse and large matrices arise in the process of solving, the problem is suboptimally solved. Therefore, Yalmip toolbox and Mosek<sup>®</sup> solver are used for this purpose.https://ceej.tabrizu.ac.ir/article_16312_ca0c96a16691a8c121ed90c82932c033.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240908A Numerical Study on the Impact of Geometric and Hydraulic Parameters on Hydraulic Sedimentation in Storage Dam ReservoirsA Numerical Study on the Impact of Geometric and Hydraulic Parameters on Hydraulic Sedimentation in Storage Dam Reservoirs53711654910.22034/ceej.2023.51982.2154FAYousefHasanzadehFaculty of Civil Engineering, University of Tabriz- Farazab Consulting Engineers, PMO, Tabriz, IranNazilaKardanDepartment of Civil Engineering, Faculty of Engineering, Azarbaijan Shahid Madani University, Tabriz, IranMostafaRoshdiFaculty of Civil Engineering, University of Tabriz, Tabriz, Iran.MehdiKomasiDepartment of Civil Engineering, Faculty of Engineering, University of Ayatollah ozma Borujerdi, BorujerdJournal Article20220607Given the significant rate of sediment accumulation in reservoirs and the urgent requirement for additional storage space due to the impracticability of constructing new reservoirs, multiple methods have been explored and implemented to assess sediment deposition, regulate sediment inflow, and facilitate sediment flushing while considering their downstream implications. Hydraulic sediment removal is a highly efficient method for recovering occupied reservoir volume without incurring exorbitant costs linked to mechanical sediment removal methods, thereby achieving enhanced operational efficiency. In this approach, erodible sediments accumulated within the reservoir are targeted for removal by opening deep gates, thereby inducing erosion and facilitating the extraction of a portion of the sediment. This can be accomplished through two approaches: under pressure, where the reservoir water level remains unaffected, and by decreasing the reservoir water level to align with that of the river.Given the significant rate of sediment accumulation in reservoirs and the urgent requirement for additional storage space due to the impracticability of constructing new reservoirs, multiple methods have been explored and implemented to assess sediment deposition, regulate sediment inflow, and facilitate sediment flushing while considering their downstream implications. Hydraulic sediment removal is a highly efficient method for recovering occupied reservoir volume without incurring exorbitant costs linked to mechanical sediment removal methods, thereby achieving enhanced operational efficiency. In this approach, erodible sediments accumulated within the reservoir are targeted for removal by opening deep gates, thereby inducing erosion and facilitating the extraction of a portion of the sediment. This can be accomplished through two approaches: under pressure, where the reservoir water level remains unaffected, and by decreasing the reservoir water level to align with that of the river.https://ceej.tabrizu.ac.ir/article_16549_8e6c56c013ddb15dd22eadf034859e15.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Effect of Metakaolin on Dispersivity Potential and Geotechnical Parameters of Dispersive SoilsEffect of Metakaolin on Dispersivity Potential and Geotechnical Parameters of Dispersive Soils73831642110.22034/ceej.2023.55917.2240FAAhmadrezaSoltanianDepartment of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, IranAmir AliZadDepartment of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, IranMaryamYazdiDepartment of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, IranAminTohidiDepartment of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, IranJournal Article20230320 Nowadays, the dispersion phenomenon is one of the main concerns for industrial and civil projects in southern regions of Iran. In this phenomenon, dispersive clay soil, under special situation, is dispersed and rapidly washed away. Due to the continuous developments in industrial and mineral additives, in this study metakaolin was used for soil improving dispersive soils. Researchers have always studied the use of additives for soil improvement. However, using cheap and environmentally friendly additives, such as natural pozzolans, are more desired. Natural pozzolans, are silica and alumina-silica materials with no apparent cement property but in presence of water, they make bonds with hydrate calcium and have cement properties. By reviewing previous studies, it can be seen that using pozzolanic materials are environmentally friendly, reduces energy consumption, reduces costs, reduces permeability and increases the chemical resistance of concrete. Metakaolin is a natural pozzolan with high permeability, with 50-55% SiO2 which reacts with Ca (OH)2 in room temperature and produces the calcium silicate hydrate (CSH) gel. Kolovos et al (2013) investigated mechanical properties of a soil improved by metakaolin. In this study, the optimum mix design of cement soil and its mechanical properties are investigated and the results show improved mechanical properties of soil. Wu et al (2016) studied the effect of metakaolin and cement on MHS strength and soil structure. The results show that adding metakaolin to soil reduces its sensitivity to water and significantly increased the uniaxial compressive strength and tensile strength of soil. Wianglor et al (2017) reviewed the effects of alkaline active metakaolin on compressive strength and particle structure of the improved mortar in 23 and 60 centigrade. The results show that increasing the amount of metakaolin and the temperature results in increased compressive strength and silicate and aluminate gel is apparently seen in mortar particle structure. In recent years, the compound effect of cement and metakaolin have rarely been studied, however there is no record for using metakaolin alone for soil improvement. This study aims to investigate the effects of different metakaolin percentages on reducing the clay dispersion potential, using crumb test, hydrometry, and also reviewing its geotechnical properties, such as Atterberg limits, maximum dry density, optimum humidity percentage, uniaxial compressive strength, and its validation using SEM. Nowadays, the dispersion phenomenon is one of the main concerns for industrial and civil projects in southern regions of Iran. In this phenomenon, dispersive clay soil, under special situation, is dispersed and rapidly washed away. Due to the continuous developments in industrial and mineral additives, in this study metakaolin was used for soil improving dispersive soils. Researchers have always studied the use of additives for soil improvement. However, using cheap and environmentally friendly additives, such as natural pozzolans, are more desired. Natural pozzolans, are silica and alumina-silica materials with no apparent cement property but in presence of water, they make bonds with hydrate calcium and have cement properties. By reviewing previous studies, it can be seen that using pozzolanic materials are environmentally friendly, reduces energy consumption, reduces costs, reduces permeability and increases the chemical resistance of concrete. Metakaolin is a natural pozzolan with high permeability, with 50-55% SiO2 which reacts with Ca (OH)2 in room temperature and produces the calcium silicate hydrate (CSH) gel. Kolovos et al (2013) investigated mechanical properties of a soil improved by metakaolin. In this study, the optimum mix design of cement soil and its mechanical properties are investigated and the results show improved mechanical properties of soil. Wu et al (2016) studied the effect of metakaolin and cement on MHS strength and soil structure. The results show that adding metakaolin to soil reduces its sensitivity to water and significantly increased the uniaxial compressive strength and tensile strength of soil. Wianglor et al (2017) reviewed the effects of alkaline active metakaolin on compressive strength and particle structure of the improved mortar in 23 and 60 centigrade. The results show that increasing the amount of metakaolin and the temperature results in increased compressive strength and silicate and aluminate gel is apparently seen in mortar particle structure. In recent years, the compound effect of cement and metakaolin have rarely been studied, however there is no record for using metakaolin alone for soil improvement. This study aims to investigate the effects of different metakaolin percentages on reducing the clay dispersion potential, using crumb test, hydrometry, and also reviewing its geotechnical properties, such as Atterberg limits, maximum dry density, optimum humidity percentage, uniaxial compressive strength, and its validation using SEM.https://ceej.tabrizu.ac.ir/article_16421_8b6f3bb0d9a89495c7c0fca2769aa351.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Predicting the Remaining Life of Offshore Structure Members with Random Forest AlgorithmPredicting the Remaining Life of Offshore Structure Members with Random Forest Algorithm85951648210.22034/ceej.2023.56024.2244FATourajTaghikhanyFaculty of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran0000-0003-3409-2751Mohammad NabiNazari GhalatiFaculty of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, IranJournal Article20230404<strong> Introduction</strong><br /><br /> Considering the importance and high cost of construction and maintenance of offshore platforms for the purpose of oil and gas extraction, and considering the fact that in case of failure, they can cause many environmental disasters, technical inspection of their structural condition is of serious importance. In addition to the high cost, this does not cover all aspects and it is very difficult to detect the failure in this case. Due to the repetitive nature of most of the environmental loads in the seas, these structures are constantly exposed to multiple and repetitive loadings. The phenomenon of fatigue is one of the effective factors in the health of these types of structures, so that during the past decades, the offshore industry has witnessed unfortunate events that often occurred due to the phenomenon of fatigue. One of the unpleasant cases can be mentioned the disaster of the Norwegian semi-submerged oil platform in the North Sea, named as the Kyland Alexandria, in which 123 people of the platform's crew lost their lives. One of the main braces connected to the base of the pontoon was completely broken and separated from the platform, causing the platform to completely overturn. The semi-submersible rig Sedo 135, which began operating in the Gulf of Mexico in 1965, suffered a fatigue failure in one of its rigs in 1967 after two years. One of the most widely used platforms in the Persian Gulf is the fixed platform of the stencil or jacket type, which is a steel structure that has braces and a deck, and foundations that are fixed on the sea floor by numerous piles. Fatigue cracks are the main failure factor in fixed jacket platforms (Ibrion et al., 2020).<strong> Introduction</strong><br /><br /> Considering the importance and high cost of construction and maintenance of offshore platforms for the purpose of oil and gas extraction, and considering the fact that in case of failure, they can cause many environmental disasters, technical inspection of their structural condition is of serious importance. In addition to the high cost, this does not cover all aspects and it is very difficult to detect the failure in this case. Due to the repetitive nature of most of the environmental loads in the seas, these structures are constantly exposed to multiple and repetitive loadings. The phenomenon of fatigue is one of the effective factors in the health of these types of structures, so that during the past decades, the offshore industry has witnessed unfortunate events that often occurred due to the phenomenon of fatigue. One of the unpleasant cases can be mentioned the disaster of the Norwegian semi-submerged oil platform in the North Sea, named as the Kyland Alexandria, in which 123 people of the platform's crew lost their lives. One of the main braces connected to the base of the pontoon was completely broken and separated from the platform, causing the platform to completely overturn. The semi-submersible rig Sedo 135, which began operating in the Gulf of Mexico in 1965, suffered a fatigue failure in one of its rigs in 1967 after two years. One of the most widely used platforms in the Persian Gulf is the fixed platform of the stencil or jacket type, which is a steel structure that has braces and a deck, and foundations that are fixed on the sea floor by numerous piles. Fatigue cracks are the main failure factor in fixed jacket platforms (Ibrion et al., 2020).https://ceej.tabrizu.ac.ir/article_16482_7464f6c058c47a724a8ece549e92f659.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Experimental Study and Finite Elements of BRBF For AISC 341-16Experimental Study and Finite Elements of BRBF For AISC 341-16961091721810.22034/ceej.2023.59023.2295FAHedayatVeladiDepartment of Structural Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, IranBahamnFarahmand AzarDepartment of Structural Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, IranOmidGhashangh PourDepartment of Structural Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, IranErfanYahyazadDepartment of Structural Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, IranJournal Article20231029After the Northridge earthquake, special concentrically braced frames (SCBF) have recently been introduced; further studies conducted to eliminate their shortcomings, design flaws and implementation of connector plates and their vague behavior after seismic load cycles led to development of a new CBF called buckling restrained braced frame (BRBF). In these braces, the steel core which is enclosed within steel profile filled by special concrete encloses the core completely and prevents buckling and increased critical load until compressive axial capacity is only restrained by steel yield tension. This allows the steel core resist against axial forces using entire resistance of the steel as long as casing resists against tensile buckling. As a result, braces act as structural fuse and lead to plastic behaviors, beams, and columns remain elastic in the seismic process. This study builds, tests and numerically models a buckling restrained brace to evaluate sample adequacy to meet requirements of the AISC 341-16 code.After the Northridge earthquake, special concentrically braced frames (SCBF) have recently been introduced; further studies conducted to eliminate their shortcomings, design flaws and implementation of connector plates and their vague behavior after seismic load cycles led to development of a new CBF called buckling restrained braced frame (BRBF). In these braces, the steel core which is enclosed within steel profile filled by special concrete encloses the core completely and prevents buckling and increased critical load until compressive axial capacity is only restrained by steel yield tension. This allows the steel core resist against axial forces using entire resistance of the steel as long as casing resists against tensile buckling. As a result, braces act as structural fuse and lead to plastic behaviors, beams, and columns remain elastic in the seismic process. This study builds, tests and numerically models a buckling restrained brace to evaluate sample adequacy to meet requirements of the AISC 341-16 code.https://ceej.tabrizu.ac.ir/article_17218_996877a4e3cea4879661d6cbb7bc8ab1.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Hybrid Soil Washing Process with Ozonation in a Sequencing Batch Reactor to Remediate Arsenic-Contaminated Soil and Petroleum CompoundsHybrid Soil Washing Process with Ozonation in a Sequencing Batch Reactor to Remediate Arsenic-Contaminated Soil and Petroleum Compounds1111211421410.22034/jcee.2022.46997.2053FASogandVaziriDepartment of Environmental Science and Engineering, Islamic Azad University West Tehran Branch, Tehran, IranRoyaMafigholamiDepartment of Environmental Science and Engineering, Islamic Azad University West Tehran Branch, Tehran, IranSanazKhoramipoorDepartment of Environmental Science and Engineering, Islamic Azad University West Tehran Branch, Tehran, IranJournal Article20210715 <br />Today, soil pollution is one the most concerning issues relating to environment (Mishra et al, 2019). Soil pollution leads to transfer of organic and inorganic contaminants to plants and animals and finally to human food chain which causes detrimental effects on human health (Wu et al, 2017). One of the metals that have been used by humans is Arsenic. This metal and its compounds are used in medical and dentistry purposes, electrical industry, pesticide and herbicide industry, alloy manufacturing, etc. Arsenic is one of 10 dangerous elements which is considered a threat to public health by World Health Organization (WHO; Beykpour and Arghavan, 2020). To eliminate and mineralize organic contaminants, multiple processes have been utilized. For example, different oxidizers including Chloride or hydrogen peroxide degrade contaminants throughoxidating agents like hydroxyl and superoxide radicals (Xiao et al, 2015). Moreover, soil washing process was observed to eliminate Cadmium and lead from polluted soil (Feng et al., 2020). Furthermore, biological processes are one of the methods to remediate organic and inorganic pollutants. In this regard, sequencing batch reactor (SBR) is used to treat municipal and industrial wastewater. Due to some special features, this system has gained increasing attention in Europe, China, USA (Jafarinejad, 2017). The purpose of this study is to determine the efficiency of soil washing/ ozonation/ SBR as a hybrid process to remediate polluted soil.<br /> <br />Today, soil pollution is one the most concerning issues relating to environment (Mishra et al, 2019). Soil pollution leads to transfer of organic and inorganic contaminants to plants and animals and finally to human food chain which causes detrimental effects on human health (Wu et al, 2017). One of the metals that have been used by humans is Arsenic. This metal and its compounds are used in medical and dentistry purposes, electrical industry, pesticide and herbicide industry, alloy manufacturing, etc. Arsenic is one of 10 dangerous elements which is considered a threat to public health by World Health Organization (WHO; Beykpour and Arghavan, 2020). To eliminate and mineralize organic contaminants, multiple processes have been utilized. For example, different oxidizers including Chloride or hydrogen peroxide degrade contaminants throughoxidating agents like hydroxyl and superoxide radicals (Xiao et al, 2015). Moreover, soil washing process was observed to eliminate Cadmium and lead from polluted soil (Feng et al., 2020). Furthermore, biological processes are one of the methods to remediate organic and inorganic pollutants. In this regard, sequencing batch reactor (SBR) is used to treat municipal and industrial wastewater. Due to some special features, this system has gained increasing attention in Europe, China, USA (Jafarinejad, 2017). The purpose of this study is to determine the efficiency of soil washing/ ozonation/ SBR as a hybrid process to remediate polluted soil.<br /> https://ceej.tabrizu.ac.ir/article_14214_3cc8ad1a3eb4a4d7cc400fdbd3890387.pdfUniversity of TabrizJournal of Civil and Environmental Engineering2008-79185411520240822Use of Stochastic Differential Equations in Investigating the Uncertainties Related to the Operation of the Activated Sludge Wastewater Treatment PlantUse of Stochastic Differential Equations in Investigating the Uncertainties Related to the Operation of the Activated Sludge Wastewater Treatment Plant1231361617010.22034/ceej.2023.54692.2211FAVahidNouraniFaculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, IranRezaShahidi ZonouzFaculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, IranMehdiDiniFaculty of Engineering, Azarbaijan Shahid Madani University, Tabriz, IranJournal Article20221230In the present paper, the uncertainty analysis for the activated sludge part in the wastewater treatment plant (WWTP) was done using stochastic differential equation (SDE) equations. Euler-Maruyama method was selected for the numerical solution of the It ̂o integral and the results were compared and analyzed with observational data. In the present paper, the uncertainty analysis for the activated sludge part in the wastewater treatment plant (WWTP) was done using stochastic differential equation (SDE) equations. Euler-Maruyama method was selected for the numerical solution of the It ̂o integral and the results were compared and analyzed with observational data. https://ceej.tabrizu.ac.ir/article_16170_5010d5f3941fbd7eae5b4d85298aa9f3.pdf