A
                
                
                                    - 
                    
                                                    Adsorption
                        
                                                    Separation of oily pollution from water and wastewater by low cost and reusable composite based on natural fibers [Volume 7, Issue 2, 2021, Pages 91-99]
                                            
 
                                    - 
                    
                                                    AHP
                        
                                                    Selection of the best leachate treatment method for the waste of leek fields using Analytic Hierarchy Process (AHP) [Volume 7, Issue 3, 2021, Pages 153-170]
                                            
 
                                    - 
                    
                                                    AHP
                        
                                                    Comparison of environmental risks of drilling operations of cluster and single ring models [Volume 7, Issue 4, 2021, Pages 305-319]
                                            
 
                                    - 
                    
                                                    Air quality
                        
                                                    Source, geochemical spreading and risks of trace metals in particulate matter 2.5 within a gas flaring area in Bayelsa State, Nigeria [Volume 7, Issue 2, 2021, Pages 101-118]
                                            
 
                                    - 
                    
                                                    Air stripping
                        
                                                    Mass transfer coefficient of ammonia in the air stripping process for municipal wastewater: An experimental study [Volume 7, Issue 4, 2021, Pages 289-304]
                                            
 
                                    - 
                    
                                                    Air to water ratio
                        
                                                    Mass transfer coefficient of ammonia in the air stripping process for municipal wastewater: An experimental study [Volume 7, Issue 4, 2021, Pages 289-304]
                                            
 
                                    - 
                    
                                                    Al2O3+TiO2
                        
                                                    Surface Ignition using ethanol on Mo and Al2O3-TiO2 coated in CI engine for environmental benefits [Volume 7, Issue 1, 2021, Pages 19-27]
                                            
 
                                    - 
                    
                                                    Ammonia
                        
                                                    Mass transfer coefficient of ammonia in the air stripping process for municipal wastewater: An experimental study [Volume 7, Issue 4, 2021, Pages 289-304]
                                            
 
                                    - 
                    
                                                    Anselin Local Moran index
                        
                                                    Using spatial statistics to identify drought-prone regions (A case study of Khuzestan Province, Iran) [Volume 7, Issue 4, 2021, Pages 231-262]
                                            
 
                                    - 
                    
                                                    AO7
                        
                                                    Preparation and activity evaluation of n-p CuO/CeO2ZrO2 heterojunction photocatalyst for degradation of organic azo dye in wastewater under visible light irradiation [Volume 7, Issue 2, 2021, Pages 69-78]
                                            
 
                                    - 
                    
                                                    AOP
                        
                                                    Selection of the best leachate treatment method for the waste of leek fields using Analytic Hierarchy Process (AHP) [Volume 7, Issue 3, 2021, Pages 153-170]
                                            
 
                                    - 
                    
                                                    Aspergillus niger
                        
                                                    Optimizing biogas and biofertilizer production from abundant Moroccan industrial organic wastes by the formulation and the use of a fungal inoculum [Volume 7, Issue 4, 2021, Pages 275-287]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
B
                
                
                                    - 
                    
                                                    Baffles
                        
                                                    The CO2 removal of flue gas using hollow fiber membrane contactor: a comprehensive modeling and new perspectives [Volume 7, Issue 1, 2021, Pages 47-56]
                                            
 
                                    - 
                    
                                                    Biogas
                        
                                                    Optimizing biogas and biofertilizer production from abundant Moroccan industrial organic wastes by the formulation and the use of a fungal inoculum [Volume 7, Issue 4, 2021, Pages 275-287]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
C
                
                
                                    - 
                    
                                                    Carrier, Crude oil
                        
                                                    Biodegradation of hydrocarbon by bacteria isolated from crude oil contaminated soil [Volume 7, Issue 2, 2021, Pages 57-67]
                                            
 
                                    - 
                    
                                                    Chemical oxygen demand (COD)
                        
                                                    Investigation of the biodegradability of pendimethalin by Bacillus subtilis, Pseudomonas fluorescens, and Escherichia coli [Volume 7, Issue 4, 2021, Pages 221-229]
                                            
 
                                    - 
                    
                                                    Cluster well drilling
                        
                                                    Comparison of environmental risks of drilling operations of cluster and single ring models [Volume 7, Issue 4, 2021, Pages 305-319]
                                            
 
                                    - 
                    
                                                    CO2 capture
                        
                                                    The CO2 removal of flue gas using hollow fiber membrane contactor: a comprehensive modeling and new perspectives [Volume 7, Issue 1, 2021, Pages 47-56]
                                            
 
                                    - 
                    
                                                    Constructed wetlands
                        
                                                    Performance evaluation and numerical simulation of vertical subsurface flow constructed wetlands in wastewater treatment [Volume 7, Issue 1, 2021, Pages 37-46]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
D
                
                
                                    - 
                    
                                                    Digestate
                        
                                                    Optimizing biogas and biofertilizer production from abundant Moroccan industrial organic wastes by the formulation and the use of a fungal inoculum [Volume 7, Issue 4, 2021, Pages 275-287]
                                            
 
                                    - 
                    
                                                    Dinitroaniline herbicides
                        
                                                    Investigation of the biodegradability of pendimethalin by Bacillus subtilis, Pseudomonas fluorescens, and Escherichia coli [Volume 7, Issue 4, 2021, Pages 221-229]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
E
                
                
                                    - 
                    
                                                    Ecological risk
                        
                                                    Source, geochemical spreading and risks of trace metals in particulate matter 2.5 within a gas flaring area in Bayelsa State, Nigeria [Volume 7, Issue 2, 2021, Pages 101-118]
                                            
 
                                    - 
                    
                                                    Electric field
                        
                                                    Study of the performance of bench-scale electro-membranes bioreactor in leachate treatment [Volume 7, Issue 3, 2021, Pages 209-220]
                                            
 
                                    - 
                    
                                                    Electrocoagulation
                        
                                                    Treatment of wastewater by a combined technique of adsorption, electrocoagulation followed by membrane separation [Volume 7, Issue 3, 2021, Pages 171-183]
                                            
 
                                    - 
                    
                                                    Electro MBR
                        
                                                    Study of the performance of bench-scale electro-membranes bioreactor in leachate treatment [Volume 7, Issue 3, 2021, Pages 209-220]
                                            
 
                                    - 
                    
                                                    Environmental health
                        
                                                    Source, geochemical spreading and risks of trace metals in particulate matter 2.5 within a gas flaring area in Bayelsa State, Nigeria [Volume 7, Issue 2, 2021, Pages 101-118]
                                            
 
                                    - 
                    
                                                    Environmental risk
                        
                                                    Comparison of environmental risks of drilling operations of cluster and single ring models [Volume 7, Issue 4, 2021, Pages 305-319]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
F
                
                
                                    - 
                    
                                                    FMEA
                        
                                                    Comparison of environmental risks of drilling operations of cluster and single ring models [Volume 7, Issue 4, 2021, Pages 305-319]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
G
                
                
                                    - 
                    
                                                    Geostatistics
                        
                                                    Using spatial statistics to identify drought-prone regions (A case study of Khuzestan Province, Iran) [Volume 7, Issue 4, 2021, Pages 231-262]
                                            
 
                                    - 
                    
                                                    Granular sludge
                        
                                                    Response surface methodology approach for simultaneous carbon, nitrogen, and phosphorus removal from industrial wastewater in a sequencing batch reactor [Volume 7, Issue 2, 2021, Pages 119-136]
                                            
 
                                    - 
                    
                                                    Greenhouse gas
                        
                                                    Social cost of CO2 emissions in Tehran waste management scenarios and using life cycle assessment to select the scenario with the least impact on global warming [Volume 7, Issue 1, 2021, Pages 11-17]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
H
                
                
                                    - 
                    
                                                    HFMC
                        
                                                    The CO2 removal of flue gas using hollow fiber membrane contactor: a comprehensive modeling and new perspectives [Volume 7, Issue 1, 2021, Pages 47-56]
                                            
 
                                    - 
                    
                                                    Hot spots and cold spots
                        
                                                    Using spatial statistics to identify drought-prone regions (A case study of Khuzestan Province, Iran) [Volume 7, Issue 4, 2021, Pages 231-262]
                                            
 
                                    - 
                    
                                                    HPLC
                        
                                                    Investigation of the biodegradability of pendimethalin by Bacillus subtilis, Pseudomonas fluorescens, and Escherichia coli [Volume 7, Issue 4, 2021, Pages 221-229]
                                            
 
                                    - 
                    
                                                    Hybrid treatment
                        
                                                    Treatment of wastewater by a combined technique of adsorption, electrocoagulation followed by membrane separation [Volume 7, Issue 3, 2021, Pages 171-183]
                                            
 
                                    - 
                    
                                                    HYDRUS CW2D
                        
                                                    Performance evaluation and numerical simulation of vertical subsurface flow constructed wetlands in wastewater treatment [Volume 7, Issue 1, 2021, Pages 37-46]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
L
                
                
                                    - 
                    
                                                    Leachates
                        
                                                    Co-disposal of bottom ash and municipal solid wastes: chemical, microbiological behaviours and stability in anaerobic conditions [Volume 7, Issue 3, 2021, Pages 195-208]
                                            
 
                                    - 
                    
                                                    Leachate treatment
                        
                                                    Selection of the best leachate treatment method for the waste of leek fields using Analytic Hierarchy Process (AHP) [Volume 7, Issue 3, 2021, Pages 153-170]
                                            
 
                                    - 
                    
                                                    Leachate treatment
                        
                                                    Study of the performance of bench-scale electro-membranes bioreactor in leachate treatment [Volume 7, Issue 3, 2021, Pages 209-220]
                                            
 
                                    - 
                    
                                                    Life Cycle Inventory
                        
                                                    Social cost of CO2 emissions in Tehran waste management scenarios and using life cycle assessment to select the scenario with the least impact on global warming [Volume 7, Issue 1, 2021, Pages 11-17]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
M
                
                
                                    - 
                    
                                                    Mass transfer coefficient
                        
                                                    Mass transfer coefficient of ammonia in the air stripping process for municipal wastewater: An experimental study [Volume 7, Issue 4, 2021, Pages 289-304]
                                            
 
                                    - 
                    
                                                    Membrane fouling
                        
                                                    Study of the performance of bench-scale electro-membranes bioreactor in leachate treatment [Volume 7, Issue 3, 2021, Pages 209-220]
                                            
 
                                    - 
                    
                                                    Metal enrichment
                        
                                                    Source, geochemical spreading and risks of trace metals in particulate matter 2.5 within a gas flaring area in Bayelsa State, Nigeria [Volume 7, Issue 2, 2021, Pages 101-118]
                                            
 
                                    - 
                    
                                                    Metal removal
                        
                                                    Study of the performance of bench-scale electro-membranes bioreactor in leachate treatment [Volume 7, Issue 3, 2021, Pages 209-220]
                                            
 
                                    - 
                    
                                                    Methanosarscina
                        
                                                    Co-disposal of bottom ash and municipal solid wastes: chemical, microbiological behaviours and stability in anaerobic conditions [Volume 7, Issue 3, 2021, Pages 195-208]
                                            
 
                                    - 
                    
                                                    Microbial degradation
                        
                                                    Investigation of the biodegradability of pendimethalin by Bacillus subtilis, Pseudomonas fluorescens, and Escherichia coli [Volume 7, Issue 4, 2021, Pages 221-229]
                                            
 
                                    - 
                    
                                                    Modeling
                        
                                                    Modelling turbidity removal by poly-aluminium chloride coagulant using gene expression [Volume 7, Issue 4, 2021, Pages 263-273]
                                            
 
                                    - 
                    
                                                    Molybdenum (Mo)
                        
                                                    Surface Ignition using ethanol on Mo and Al2O3-TiO2 coated in CI engine for environmental benefits [Volume 7, Issue 1, 2021, Pages 19-27]
                                            
 
                                    - 
                    
                                                    Municipal wastewater treatment plants
                        
                                                    Mass transfer coefficient of ammonia in the air stripping process for municipal wastewater: An experimental study [Volume 7, Issue 4, 2021, Pages 289-304]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
N
                
                
                                    - 
                    
                                                    Nutrient removal
                        
                                                    Performance evaluation and numerical simulation of vertical subsurface flow constructed wetlands in wastewater treatment [Volume 7, Issue 1, 2021, Pages 37-46]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
O
                
                
                                    - 
                    
                                                    Oil pollution
                        
                                                    Separation of oily pollution from water and wastewater by low cost and reusable composite based on natural fibers [Volume 7, Issue 2, 2021, Pages 91-99]
                                            
 
                                    - 
                    
                                                    Organic leachate
                        
                                                    Selection of the best leachate treatment method for the waste of leek fields using Analytic Hierarchy Process (AHP) [Volume 7, Issue 3, 2021, Pages 153-170]
                                            
 
                                    - 
                    
                                                    Organic waste
                        
                                                    Optimizing biogas and biofertilizer production from abundant Moroccan industrial organic wastes by the formulation and the use of a fungal inoculum [Volume 7, Issue 4, 2021, Pages 275-287]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
P
                
                
                                    - 
                    
                                                    Peaks
                        
                                                    Factors affecting photocatalytic degradation of Reactive Green-19 with CdO-TiO2 nanocomposite [Volume 7, Issue 3, 2021, Pages 185-194]
                                            
 
                                    - 
                    
                                                    Pendimethalin
                        
                                                    Investigation of the biodegradability of pendimethalin by Bacillus subtilis, Pseudomonas fluorescens, and Escherichia coli [Volume 7, Issue 4, 2021, Pages 221-229]
                                            
 
                                    - 
                    
                                                    Photocatalyst
                        
                                                    Preparation and activity evaluation of n-p CuO/CeO2ZrO2 heterojunction photocatalyst for degradation of organic azo dye in wastewater under visible light irradiation [Volume 7, Issue 2, 2021, Pages 69-78]
                                            
 
                                    - 
                    
                                                    Precursors
                        
                                                    Factors affecting photocatalytic degradation of Reactive Green-19 with CdO-TiO2 nanocomposite [Volume 7, Issue 3, 2021, Pages 185-194]
                                            
 
                                    - 
                    
                                                    Principal Component Analysis
                        
                                                    Statistical analysis of tropospheric ozone and its precursors using principal component analysis in an urban area of Surat, India [Volume 7, Issue 1, 2021, Pages 1-10]
                                            
 
                                    - 
                    
                                                    Produced water
                        
                                                    Treatment of wastewater by a combined technique of adsorption, electrocoagulation followed by membrane separation [Volume 7, Issue 3, 2021, Pages 171-183]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
R
                
                
                                    - 
                    
                                                    Response surface methodology
                        
                                                    Toxic hydrocarbon removal of contaminated soil using Eisenia fetida with response surface methodology [Volume 7, Issue 3, 2021, Pages 137-151]
                                            
 
                                    - 
                    
                                                    Response surface methodology
                        
                                                    Response surface methodology approach for simultaneous carbon, nitrogen, and phosphorus removal from industrial wastewater in a sequencing batch reactor [Volume 7, Issue 2, 2021, Pages 119-136]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
S
                
                
                                    - 
                    
                                                    Saccharomyces cerevisiae
                        
                                                    Optimizing biogas and biofertilizer production from abundant Moroccan industrial organic wastes by the formulation and the use of a fungal inoculum [Volume 7, Issue 4, 2021, Pages 275-287]
                                            
 
                                    - 
                    
                                                    SBR
                        
                                                    Performance of sequential batch reactor coupled to physical system for landfill leachate treatment: A pilot scale design [Volume 7, Issue 2, 2021, Pages 79-90]
                                            
 
                                    - 
                    
                                                    Scenario
                        
                                                    Social cost of CO2 emissions in Tehran waste management scenarios and using life cycle assessment to select the scenario with the least impact on global warming [Volume 7, Issue 1, 2021, Pages 11-17]
                                            
 
                                    - 
                    
                                                    SDNR
                        
                                                    Response surface methodology approach for simultaneous carbon, nitrogen, and phosphorus removal from industrial wastewater in a sequencing batch reactor [Volume 7, Issue 2, 2021, Pages 119-136]
                                            
 
                                    - 
                    
                                                    Shell and Tube
                        
                                                    The CO2 removal of flue gas using hollow fiber membrane contactor: a comprehensive modeling and new perspectives [Volume 7, Issue 1, 2021, Pages 47-56]
                                            
 
                                    - 
                    
                                                    Single ring drilling
                        
                                                    Comparison of environmental risks of drilling operations of cluster and single ring models [Volume 7, Issue 4, 2021, Pages 305-319]
                                            
 
                                    - 
                    
                                                    Spatial correlation
                        
                                                    Using spatial statistics to identify drought-prone regions (A case study of Khuzestan Province, Iran) [Volume 7, Issue 4, 2021, Pages 231-262]
                                            
 
                                    - 
                    
                                                    Spatial statistics
                        
                                                    Using spatial statistics to identify drought-prone regions (A case study of Khuzestan Province, Iran) [Volume 7, Issue 4, 2021, Pages 231-262]
                                            
 
                                    - 
                    
                                                    Surat
                        
                                                    Statistical analysis of tropospheric ozone and its precursors using principal component analysis in an urban area of Surat, India [Volume 7, Issue 1, 2021, Pages 1-10]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
T
                
                
                                    - 
                    
                                                    Tehran city
                        
                                                    Social cost of CO2 emissions in Tehran waste management scenarios and using life cycle assessment to select the scenario with the least impact on global warming [Volume 7, Issue 1, 2021, Pages 11-17]
                                            
 
                                    - 
                    
                                                    Tropospheric ozone
                        
                                                    Statistical analysis of tropospheric ozone and its precursors using principal component analysis in an urban area of Surat, India [Volume 7, Issue 1, 2021, Pages 1-10]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
U
                
                
                                    - 
                    
                                                    Urban transportation
                        
                                                    Statistical analysis of tropospheric ozone and its precursors using principal component analysis in an urban area of Surat, India [Volume 7, Issue 1, 2021, Pages 1-10]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
V
                
                
                                    - 
                    
                                                    Vermiremediation
                        
                                                    Toxic hydrocarbon removal of contaminated soil using Eisenia fetida with response surface methodology [Volume 7, Issue 3, 2021, Pages 137-151]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
W
                
                
                                    - 
                    
                                                    Wastewater treatment
                        
                                                    Performance evaluation and numerical simulation of vertical subsurface flow constructed wetlands in wastewater treatment [Volume 7, Issue 1, 2021, Pages 37-46]
                                            
 
                                    - 
                    
                                                    Wastewater treatment
                        
                                                    Separation of oily pollution from water and wastewater by low cost and reusable composite based on natural fibers [Volume 7, Issue 2, 2021, Pages 91-99]
                                            
 
                                    - 
                    
                                                    Wastewater treatment
                        
                                                    Response surface methodology approach for simultaneous carbon, nitrogen, and phosphorus removal from industrial wastewater in a sequencing batch reactor [Volume 7, Issue 2, 2021, Pages 119-136]
                                            
 
                                    - 
                    
                                                    Wastewater treatment
                        
                                                    Treatment of wastewater by a combined technique of adsorption, electrocoagulation followed by membrane separation [Volume 7, Issue 3, 2021, Pages 171-183]
                                            
 
                                    - 
                    
                                                    Water Reuse
                        
                                                    Separation of oily pollution from water and wastewater by low cost and reusable composite based on natural fibers [Volume 7, Issue 2, 2021, Pages 91-99]
                                            
 
                                    - 
                    
                                                    Water use
                        
                                                    Performance evaluation and numerical simulation of vertical subsurface flow constructed wetlands in wastewater treatment [Volume 7, Issue 1, 2021, Pages 37-46]
                                            
 
                                
                
             
         
     
    
    
    
        
            
                
                    
X
                
                
                                    - 
                    
                                                    XRD
                        
                                                    Factors affecting photocatalytic degradation of Reactive Green-19 with CdO-TiO2 nanocomposite [Volume 7, Issue 3, 2021, Pages 185-194]
                                            
 
                                
                
             
         
     
    
    
 
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