Pub Date : 2019-07-01DOI: 10.22104/AET.2020.3874.1191
A. Abbaspour, H. Asghari
Maintaining the levels of nitrogen in agricultural fields to ensure crop yield performance is challenging due to the complex dynamics of nitrogen transformation in soil. Nitrogen is mainly taken up by plant roots in the form of nitrate, but it is considered as an environmental pollutant that threatens human and animal health. Therefore, it is necessary to use adsorbent compounds to retain nitrate in the soil. The effectiveness of two types of biochar produced from rice husk (Br) and populous wood (Bp) and two arbuscular mycorrhizal fungi, namely Funneliformis intraradices (Mi) and Funneliformis versiforme (Mv), on nitrate leaching in soil was evaluated. The soil columns planted with corn were filled with an artificial sandy clay loam soil fertigated with urea fertilizer under glasshouse conditions . After nine weeks of growing the plants, a pulse of nitrogen (0.48 g urea per core) was added to the columns. One week after the addition of urea, the shoots of the plants were removed, and the columns immediately flushed with 500 ml of deionized water to leach the soil nitrogen from the columns. The results showed that the shoots' dry-weight increased significantly (p≤ 0.05) in almost all the treatments with the highest in the BrMi treatment when compared to the control (C). The nitrate concentration in the leachate decreased 79% (from 23.2 mg/l in C treatment to 4.2 mg/l in Bp treatment), but the nitrate concentration in the soil solution increased up to 6.7-fold (Bp was the highest), which suggested a high N retention by the biochars used. It was concluded that the application of biochar and mycorrhizal fungi could reduce nitrogen loss through this artificial sandy clay loam soil and may have some implications in environment conservation.
{"title":"Effect of biochar on nitrogen retention in soil under corn plant inoculated with arbuscular mycorrhizal fungi","authors":"A. Abbaspour, H. Asghari","doi":"10.22104/AET.2020.3874.1191","DOIUrl":"https://doi.org/10.22104/AET.2020.3874.1191","url":null,"abstract":"Maintaining the levels of nitrogen in agricultural fields to ensure crop yield performance is challenging due to the complex dynamics of nitrogen transformation in soil. Nitrogen is mainly taken up by plant roots in the form of nitrate, but it is considered as an environmental pollutant that threatens human and animal health. Therefore, it is necessary to use adsorbent compounds to retain nitrate in the soil. The effectiveness of two types of biochar produced from rice husk (Br) and populous wood (Bp) and two arbuscular mycorrhizal fungi, namely Funneliformis intraradices (Mi) and Funneliformis versiforme (Mv), on nitrate leaching in soil was evaluated. The soil columns planted with corn were filled with an artificial sandy clay loam soil fertigated with urea fertilizer under glasshouse conditions . After nine weeks of growing the plants, a pulse of nitrogen (0.48 g urea per core) was added to the columns. One week after the addition of urea, the shoots of the plants were removed, and the columns immediately flushed with 500 ml of deionized water to leach the soil nitrogen from the columns. The results showed that the shoots' dry-weight increased significantly (p≤ 0.05) in almost all the treatments with the highest in the BrMi treatment when compared to the control (C). The nitrate concentration in the leachate decreased 79% (from 23.2 mg/l in C treatment to 4.2 mg/l in Bp treatment), but the nitrate concentration in the soil solution increased up to 6.7-fold (Bp was the highest), which suggested a high N retention by the biochars used. It was concluded that the application of biochar and mycorrhizal fungi could reduce nitrogen loss through this artificial sandy clay loam soil and may have some implications in environment conservation.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"264 1","pages":"133-140"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78859024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-01DOI: 10.22104/AET.2020.4181.1208
A. Zand
Application of nanotechnology has gained remarkable interest in recent years and environmental exposure to nanomaterials is becoming inevitable. Therefore, nanotoxicity problem is gaining more attention. Zero-valent iron nano particles (nZVI) are being used widely for different purposes such as environmental remediation. Excessive amounts of nanomaterials may pose inhibitory effects on growth of plants cultivated in nZVI-affected soils which has been addressed in this research. Moreover, fate of nZVI in plants was investigated in the present study. Plant seeds were exposed to different concentrations of nZVI i.e. 0, 100, 250, 500, 800 and 1000 mg/kg. Z. mays was selected as the model plant in this study and found to be a tolerant plant species in presence of low to moderate levels of nZVI in soil. However, addition of higher doses of nZVI reduced seedling emergence and biomass establishment. Results indicated that the total Fe concentrations in Z. mays treated with nZVI increased compared to the control. Considerably higher accumulation of Fe in roots of Z. mays compared to the shoots in all treatments was found. Results indicated that the total Fe contents in Z. mays treated with nZVI were higher than those in control, with the highest Fe accumulation capacity of 24666.2 µg per pot which was obtained in soil received 500 mg/kg nZVI. Overally, toxic effects of higher doses of nZVI on plants were observed in this study. Intelligent use of nZVI for environmental purposes such as applying low to moderate levels of nZVI in soil remediation activities could remarkably prevent their adverse impacts on plant species, promote plant phytoextraction capability, and reduce nZV emission in the environment.
近年来，纳米技术的应用引起了人们的极大兴趣，纳米材料的环境暴露已成为不可避免的问题。因此，纳米毒性问题越来越受到人们的重视。零价铁纳米颗粒在环境修复等领域得到了广泛的应用。过量的纳米材料可能会对nzvi影响土壤中栽培的植物生长产生抑制作用，本研究已经解决了这一问题。此外，本研究还探讨了nZVI在植物体内的归宿。将植物种子暴露于不同浓度的nZVI中，即0、100、250、500、800和1000 mg/kg。本研究选择Z. mays作为模式植物，发现土壤中存在低至中等水平的nZVI, Z. mays是一种耐受植物。然而，添加高剂量的nZVI降低了幼苗的出苗和生物量的建立。结果表明，与对照相比，nZVI处理后的黄颡鱼体内总铁浓度升高。结果表明，在不同处理下，根铁积累量显著高于茎铁积累量。结果表明，nZVI处理的马尾松总铁含量高于对照，500 mg/kg nZVI处理的马尾松铁积累量最高，达到24666.2µg /盆;总体而言，在本研究中观察到高剂量nZVI对植物的毒性作用。将nZVI智能应用于环境目的，如在土壤修复活动中应用低至中等水平的nZVI，可以显著防止其对植物物种的不利影响，提高植物的植物提取能力，减少环境中nZV的排放。
{"title":"Toxicity of zero-valent iron nanoparticles and its fate in Zea mays","authors":"A. Zand","doi":"10.22104/AET.2020.4181.1208","DOIUrl":"https://doi.org/10.22104/AET.2020.4181.1208","url":null,"abstract":"Application of nanotechnology has gained remarkable interest in recent years and environmental exposure to nanomaterials is becoming inevitable. Therefore, nanotoxicity problem is gaining more attention. Zero-valent iron nano particles (nZVI) are being used widely for different purposes such as environmental remediation. Excessive amounts of nanomaterials may pose inhibitory effects on growth of plants cultivated in nZVI-affected soils which has been addressed in this research. Moreover, fate of nZVI in plants was investigated in the present study. Plant seeds were exposed to different concentrations of nZVI i.e. 0, 100, 250, 500, 800 and 1000 mg/kg. Z. mays was selected as the model plant in this study and found to be a tolerant plant species in presence of low to moderate levels of nZVI in soil. However, addition of higher doses of nZVI reduced seedling emergence and biomass establishment. Results indicated that the total Fe concentrations in Z. mays treated with nZVI increased compared to the control. Considerably higher accumulation of Fe in roots of Z. mays compared to the shoots in all treatments was found. Results indicated that the total Fe contents in Z. mays treated with nZVI were higher than those in control, with the highest Fe accumulation capacity of 24666.2 µg per pot which was obtained in soil received 500 mg/kg nZVI. Overally, toxic effects of higher doses of nZVI on plants were observed in this study. Intelligent use of nZVI for environmental purposes such as applying low to moderate levels of nZVI in soil remediation activities could remarkably prevent their adverse impacts on plant species, promote plant phytoextraction capability, and reduce nZV emission in the environment.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"105 1","pages":"149-156"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79281691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, a synthetic and modified PPAP-MPTMS-MCM-41 nano-adsorbent was used to remove nickel (II) during a batch process. Studying the parameters that were effective on adsorption revealed that the PPAP-MPTMS-MCM-41 adsorbent was the most effective in the adsorption of nickel (II) from a standard solution (Conc. = 5 mg/L, volume = 100 mL) under the following conditions: pH=8, contact time = 20 min, 6 wt.% of poly para-aminophenol (PPAP) ligand, adsorbent mass = 0.3 g, 1 molar hydrochloric acid (to remove nickel from the adsorbent), and NaCl salt with a concentration of less than 100 g/L. The results showed that the Langmuir isotherm had a higher linear and non-linear fitting with the experimental data. Investigating the kinetic models and mass transfer of this adsorption process showed that the experimental data were in good agreement with the pseudo-second-order kinetic model and the intra-particle mass transfer model. According to thermodynamic studies, this adsorption process is endothermic; its Gibbs free energy value is positive such that with an increase in temperature, it goes to lower values, and thus the process progresses spontaneously.
{"title":"Removal of Ni (II) from aqueous solution using modified MCM-41 nano-adsorbents","authors":"Behrouz Raei, Afsaneh Barekat, Habibollah Shariyatinia","doi":"10.22104/AET.2020.4178.1207","DOIUrl":"https://doi.org/10.22104/AET.2020.4178.1207","url":null,"abstract":"In this study, a synthetic and modified PPAP-MPTMS-MCM-41 nano-adsorbent was used to remove nickel (II) during a batch process. Studying the parameters that were effective on adsorption revealed that the PPAP-MPTMS-MCM-41 adsorbent was the most effective in the adsorption of nickel (II) from a standard solution (Conc. = 5 mg/L, volume = 100 mL) under the following conditions: pH=8, contact time = 20 min, 6 wt.% of poly para-aminophenol (PPAP) ligand, adsorbent mass = 0.3 g, 1 molar hydrochloric acid (to remove nickel from the adsorbent), and NaCl salt with a concentration of less than 100 g/L. The results showed that the Langmuir isotherm had a higher linear and non-linear fitting with the experimental data. Investigating the kinetic models and mass transfer of this adsorption process showed that the experimental data were in good agreement with the pseudo-second-order kinetic model and the intra-particle mass transfer model. According to thermodynamic studies, this adsorption process is endothermic; its Gibbs free energy value is positive such that with an increase in temperature, it goes to lower values, and thus the process progresses spontaneously.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"72 1","pages":"157-169"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75527241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.22104/AET.2020.4143.1205
A. Zand, A. V. Heir
Kish Island is a popular tourist destination in Iran, and tourism plays an important role in its economy. The volume of waste produced in the island has increased given the construction of numerous industrial projects over the past decade, as well as an increase in the tourist population. This expansion signals a need to create new methods of waste disposal. Environmental Impact Assessment (EIA) is a process that can be used to evaluate the impact of waste disposal options on Kish Island. Rapid impact assessment matrix (RIAM) is a powerful tool to carry out the environmental impact assessment. The RIAM conducted in this research incorporated the mathematical sustainability model to evaluate the impacts of four municipal solid waste disposal options on the environment on Kish Island. The options included: (Option 1) Continuing the current disposal activities in Kish Island, i.e., 50% waste recycling and 50% waste landfilling; (Option 2) 30% composting, 50% waste recycling, and 20% waste landfilling; (Option 3) 30% composting, 50% waste recycling, and 20% waste incineration; and (Option 4) 50% waste recycling and 50% waste incineration. Among these options, option 4 was the priority for the establishment of final waste disposal with the highest score (0.043) in terms of sustainability, as well as having fewer adverse environmental impacts. However, the current environmental status of the Kish Island disposal site (Option 1) had the lowest score (-0.263) in terms of sustainability and was found to be the last priority with the most destructive environmental effects.
{"title":"Environmental Impact Assessment of Solid Waste Disposal Options in Touristic Islands","authors":"A. Zand, A. V. Heir","doi":"10.22104/AET.2020.4143.1205","DOIUrl":"https://doi.org/10.22104/AET.2020.4143.1205","url":null,"abstract":"Kish Island is a popular tourist destination in Iran, and tourism plays an important role in its economy. The volume of waste produced in the island has increased given the construction of numerous industrial projects over the past decade, as well as an increase in the tourist population. This expansion signals a need to create new methods of waste disposal. Environmental Impact Assessment (EIA) is a process that can be used to evaluate the impact of waste disposal options on Kish Island. Rapid impact assessment matrix (RIAM) is a powerful tool to carry out the environmental impact assessment. The RIAM conducted in this research incorporated the mathematical sustainability model to evaluate the impacts of four municipal solid waste disposal options on the environment on Kish Island. The options included: (Option 1) Continuing the current disposal activities in Kish Island, i.e., 50% waste recycling and 50% waste landfilling; (Option 2) 30% composting, 50% waste recycling, and 20% waste landfilling; (Option 3) 30% composting, 50% waste recycling, and 20% waste incineration; and (Option 4) 50% waste recycling and 50% waste incineration. Among these options, option 4 was the priority for the establishment of final waste disposal with the highest score (0.043) in terms of sustainability, as well as having fewer adverse environmental impacts. However, the current environmental status of the Kish Island disposal site (Option 1) had the lowest score (-0.263) in terms of sustainability and was found to be the last priority with the most destructive environmental effects.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"91 1","pages":"115-125"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85546584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.22104/AET.2020.4100.1202
A. H. Moghaddam, J. Shayegan
The selection of an optimum treatment process for high-strength wastewater is complicated. Familiarity with wastewater treatment methods is not enough to design a plant and requires a multidisciplinary knowledge base. In this research, five alternative wastewater treatment methods for high-strength wastewater were investigated and ranked based on the analytic hierarchy process (AHP) fuzzy method: upflow anaerobic sludge blanket (UASB) + membrane bioreactor (MBR), UASB + extended aeration (EA), anaerobic baffled reactor (ABR), anaerobic lagoon (ANL) + aerated lagoon (AL), and sequencing batch reactor (SBR) + ABR. These treatment methods were ranked based on five criteria, namely energy consumption, effluent total suspended solids (TSS), effluent chemical oxygen demand (COD), cost, and level of technology. The different options of the wastewater treatment plant were rated by expert decision-makers in this field. The results show that for typical high-strength wastewater, the use of an UASB reactor followed by a MBR is the most appropriate alternative for treating the wastewater.
{"title":"Developing a multi-criteria decision support system based on fuzzy analytical hierarchical process (AHP) method for selection of appropriate high-strength wastewater treatment plant","authors":"A. H. Moghaddam, J. Shayegan","doi":"10.22104/AET.2020.4100.1202","DOIUrl":"https://doi.org/10.22104/AET.2020.4100.1202","url":null,"abstract":"The selection of an optimum treatment process for high-strength wastewater is complicated. Familiarity with wastewater treatment methods is not enough to design a plant and requires a multidisciplinary knowledge base. In this research, five alternative wastewater treatment methods for high-strength wastewater were investigated and ranked based on the analytic hierarchy process (AHP) fuzzy method: upflow anaerobic sludge blanket (UASB) + membrane bioreactor (MBR), UASB + extended aeration (EA), anaerobic baffled reactor (ABR), anaerobic lagoon (ANL) + aerated lagoon (AL), and sequencing batch reactor (SBR) + ABR. These treatment methods were ranked based on five criteria, namely energy consumption, effluent total suspended solids (TSS), effluent chemical oxygen demand (COD), cost, and level of technology. The different options of the wastewater treatment plant were rated by expert decision-makers in this field. The results show that for typical high-strength wastewater, the use of an UASB reactor followed by a MBR is the most appropriate alternative for treating the wastewater.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"30 1","pages":"99-105"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81308062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.22104/AET.2020.4137.1204
Fatemeh Ziaadini, A. Mostafavi, T. Shamspur, F. Fathirad
In the present study, the core-shell magnetic nanostructure of Fe3O4@SiO2@CeO2 was synthesized to investigate its use as an effective photocatalyst for methylene blue removal. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and a vibrating sample magnetometer (VSM). The photocatalytic activity for the Fe3O4@SiO2@CeO2 core-shell magnetic nanostructure was investigated under visible light by determining the degradation rate of methylene blue for 50 min. At the end of the photocatalytic degradation process, the magnetic catalyst was recovered by an external magnetic field. The performance of the proposed catalyst for the degradation of methylene blue was improved with the optimization of the effective parameters such as the amount of catalyst, pH, and reaction time. Under optimum conditions, the efficiency of methylene blue removal with the proposed photocatalyst remains higher than 92 % after five times of use. The second pseudo-model was selected as the kinetic model to calculate catalytic degradation. The present results show that the Fe3O4@SiO2@CeO2 can be an efficient nanocatalyst for the photodegradation of dye pollutants.
{"title":"Photocatalytic degradation of methylene blue from aqueous solution using Fe3O4@SiO2@CeO2 core-shell magnetic nanostructure as an effective catalyst","authors":"Fatemeh Ziaadini, A. Mostafavi, T. Shamspur, F. Fathirad","doi":"10.22104/AET.2020.4137.1204","DOIUrl":"https://doi.org/10.22104/AET.2020.4137.1204","url":null,"abstract":"In the present study, the core-shell magnetic nanostructure of Fe3O4@SiO2@CeO2 was synthesized to investigate its use as an effective photocatalyst for methylene blue removal. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and a vibrating sample magnetometer (VSM). The photocatalytic activity for the Fe3O4@SiO2@CeO2 core-shell magnetic nanostructure was investigated under visible light by determining the degradation rate of methylene blue for 50 min. At the end of the photocatalytic degradation process, the magnetic catalyst was recovered by an external magnetic field. The performance of the proposed catalyst for the degradation of methylene blue was improved with the optimization of the effective parameters such as the amount of catalyst, pH, and reaction time. Under optimum conditions, the efficiency of methylene blue removal with the proposed photocatalyst remains higher than 92 % after five times of use. The second pseudo-model was selected as the kinetic model to calculate catalytic degradation. The present results show that the Fe3O4@SiO2@CeO2 can be an efficient nanocatalyst for the photodegradation of dye pollutants.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"38 1","pages":"127-132"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87445942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.22104/AET.2020.3973.1198
Elham Narooei, Davod Mohebbi-Kalhori, A. Samimi, M. Zivdar
The removal of formaldehyde from contaminated air was investigated via three laboratory-scale biofilters packed with different materials: a mixture of compost and woodchips (І), the natural clinoptilolite zeolite particles in the original form (II), and the mixture of zeolite/activated carbon (III). The biofilters were inoculated using aerobic sludge. The average removal efficiencies of 97.5%, 90%, and 93.5% were obtained at a 100 s empty bed residence time (EBRT) and 20 mg/m3 inlet concentration of formaldehyde for the biofilter of configurations І, II, and III, respectively. Also, the performance of the reactors was investigated at different EBRTs of 20, 30, 60, and 100 s, and the maximum elimination capacity of 2840 mg/m3.h was achieved at the lowest EBRT (20 s) for the biofilter of configuration II. Increasing the inlet formaldehyde concentration from 20 mg/m3 to 80 mg/m3 led to the maximum formaldehyde removal efficiency of 82% for the biofilter of configuration III. Therefore, a comparison of the results of the biofilters' performances showed that the biofilter of configuration III had the best performance, which was validated by obtaining a higher mass transfer coefficient. However, the biofilter of configurations II and III achieved steady-state conditions in a shorter time.
{"title":"A comparative study of the effect of compost/woodchips mixture, natural zeolite and zeolite/activated carbon mixture as packing materials on the biofilter performance","authors":"Elham Narooei, Davod Mohebbi-Kalhori, A. Samimi, M. Zivdar","doi":"10.22104/AET.2020.3973.1198","DOIUrl":"https://doi.org/10.22104/AET.2020.3973.1198","url":null,"abstract":"The removal of formaldehyde from contaminated air was investigated via three laboratory-scale biofilters packed with different materials: a mixture of compost and woodchips (І), the natural clinoptilolite zeolite particles in the original form (II), and the mixture of zeolite/activated carbon (III). The biofilters were inoculated using aerobic sludge. The average removal efficiencies of 97.5%, 90%, and 93.5% were obtained at a 100 s empty bed residence time (EBRT) and 20 mg/m3 inlet concentration of formaldehyde for the biofilter of configurations І, II, and III, respectively. Also, the performance of the reactors was investigated at different EBRTs of 20, 30, 60, and 100 s, and the maximum elimination capacity of 2840 mg/m3.h was achieved at the lowest EBRT (20 s) for the biofilter of configuration II. Increasing the inlet formaldehyde concentration from 20 mg/m3 to 80 mg/m3 led to the maximum formaldehyde removal efficiency of 82% for the biofilter of configuration III. Therefore, a comparison of the results of the biofilters' performances showed that the biofilter of configuration III had the best performance, which was validated by obtaining a higher mass transfer coefficient. However, the biofilter of configurations II and III achieved steady-state conditions in a shorter time.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"18 1","pages":"67-75"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81806528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.22104/AET.2020.3781.1187
J. R. Shahrouzi, Sakineh Molaee, Amanollah Ebadi, Farshid Towfighi, Farshad Bakhti
In this study, the adsorption of amoxicillin onto activated carbon was investigated. The effect of particle size and the effluent flow rate was discussed as well as the kinetics and isotherm of adsorption equilibrium. The isotherm equilibrium studies showed that the Langmuir model was appropriate for describing the adsorption equilibrium of amoxicillin onto the activated carbon. Furthermore, the kinetics of adsorption fit the pseudo-second-order model while the highest adsorption amount occurred at pH = 5. Moreover, the change of particle size from 600 microns to 125 microns resulted in increasing the adsorption amount of 102 mg/g to 225 mg/g. Furthermore, the breakthrough curves indicated that the controlling mechanism of mass transfer was intra-particle diffusion. Also, by reducing the length of the bed from 6.8 to 3.4 cm, the breakpoint time decreased from 3.2 hours to 54 minutes at 300 ppm initial concentration. Eventually, the breakpoint time increased from 2 minutes to 55 minutes by decreasing the average particle diameter from 840 to 250 microns.
{"title":"Investigation of effective parameters on adsorption of amoxicillin from aqueous medium onto activated carbon","authors":"J. R. Shahrouzi, Sakineh Molaee, Amanollah Ebadi, Farshid Towfighi, Farshad Bakhti","doi":"10.22104/AET.2020.3781.1187","DOIUrl":"https://doi.org/10.22104/AET.2020.3781.1187","url":null,"abstract":"In this study, the adsorption of amoxicillin onto activated carbon was investigated. The effect of particle size and the effluent flow rate was discussed as well as the kinetics and isotherm of adsorption equilibrium. The isotherm equilibrium studies showed that the Langmuir model was appropriate for describing the adsorption equilibrium of amoxicillin onto the activated carbon. Furthermore, the kinetics of adsorption fit the pseudo-second-order model while the highest adsorption amount occurred at pH = 5. Moreover, the change of particle size from 600 microns to 125 microns resulted in increasing the adsorption amount of 102 mg/g to 225 mg/g. Furthermore, the breakthrough curves indicated that the controlling mechanism of mass transfer was intra-particle diffusion. Also, by reducing the length of the bed from 6.8 to 3.4 cm, the breakpoint time decreased from 3.2 hours to 54 minutes at 300 ppm initial concentration. Eventually, the breakpoint time increased from 2 minutes to 55 minutes by decreasing the average particle diameter from 840 to 250 microns.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"72 1","pages":"107-114"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80049742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.22104/AET.2020.3990.1200
Farhad Afshar, M. Abbaspour, A. Lahijanian
The purpose of this study was to present a practical model of strategic waste management via two Strength, Weakness, Opportunity, and Threats (SWOT) models and hierarchical analysis. In this regard, the strengths and weaknesses of the present situation and the factors affecting waste management in Tehran were investigated. In this study, the importance of public participation in waste management was investigated by means of the Delphi method and the Fuzzy Analytic Hierarchy Process (FAHP). Based on the results of the SWOT analysis, a team of experts identified the internal and external factors and rated the primary factors; each factor was weighted, then according to their scores, the proposed waste management framework was developed. Finally, the strategies were quantitatively prioritized by the planning matrix. Then, using the analysis method, the hierarchy was used in this study as a SWOT supplement. The results of two questionnaires designed in this study identified the socio-economic, educational, cultural, and political factors as first to fourth, respectively. The most viable strategies, which were selected based on the analysis, include the potential use of social networks to encourage society to reduce waste and to promote the separation of waste as well as compliance with the proposed comprehensive waste management program; another choice strategy was providing economic incentives to maximize social participation in reducing waste production waste sorting.
{"title":"Providing a practical Model of the Waste Management Master Plan with Emphasis on Public Participation “Using the SWOT method and the QSPM matrix and the FAHP method”","authors":"Farhad Afshar, M. Abbaspour, A. Lahijanian","doi":"10.22104/AET.2020.3990.1200","DOIUrl":"https://doi.org/10.22104/AET.2020.3990.1200","url":null,"abstract":"The purpose of this study was to present a practical model of strategic waste management via two Strength, Weakness, Opportunity, and Threats (SWOT) models and hierarchical analysis. In this regard, the strengths and weaknesses of the present situation and the factors affecting waste management in Tehran were investigated. In this study, the importance of public participation in waste management was investigated by means of the Delphi method and the Fuzzy Analytic Hierarchy Process (FAHP). Based on the results of the SWOT analysis, a team of experts identified the internal and external factors and rated the primary factors; each factor was weighted, then according to their scores, the proposed waste management framework was developed. Finally, the strategies were quantitatively prioritized by the planning matrix. Then, using the analysis method, the hierarchy was used in this study as a SWOT supplement. The results of two questionnaires designed in this study identified the socio-economic, educational, cultural, and political factors as first to fourth, respectively. The most viable strategies, which were selected based on the analysis, include the potential use of social networks to encourage society to reduce waste and to promote the separation of waste as well as compliance with the proposed comprehensive waste management program; another choice strategy was providing economic incentives to maximize social participation in reducing waste production waste sorting.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"15 1","pages":"77-96"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75307130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.22104/AET.2020.3841.1189
Shimeles Addisu Kitte, Solomon Dressa, Hailu Endale, D. Dadi
The study presented in this article investigated the removal of a long chain anionic surfactant from residential laundry wastewater using jackfruit (Artocarpus heterophyllus) seeds. The main ingredients of laundry wastewater are the surfactants. Therefore, great attention should be given to the treatment and disposal of laundry wastewater. The use of natural substitutes in treating wastewater has no harmful effects, and it is considered an effective step towards protecting the environment and promoting sustainability. Jar test experiments were conducted in order to determine the optimum conditions for the removal of surfactants, chemical oxygen demand (COD), biological oxygen demand (BOD), turbidity in terms of effective dosage, and pH control. The surfactant, COD, BOD, and turbidity removal efficiencies were 91.66%, 82.86%, 77.66%, and 85.14% at the optimum initial pH value of 6, the optimum dose of 2.5 g/L, and optimum mixing time of 25 minutes, respectively. It can be concluded that Artocarpus heterophyllus seed powder was a feasible and cost-effective natural coagulant for the removal of anionic surfactant from laundry wastewater. The results showed that the pseudo-second-order equation is the suitable model for this system.
{"title":"Removal of Anionic Surfactant from Residential Laundry Wastewater using Jackfruit (Artocarpus heterophyllus) seeds","authors":"Shimeles Addisu Kitte, Solomon Dressa, Hailu Endale, D. Dadi","doi":"10.22104/AET.2020.3841.1189","DOIUrl":"https://doi.org/10.22104/AET.2020.3841.1189","url":null,"abstract":"The study presented in this article investigated the removal of a long chain anionic surfactant from residential laundry wastewater using jackfruit (Artocarpus heterophyllus) seeds. The main ingredients of laundry wastewater are the surfactants. Therefore, great attention should be given to the treatment and disposal of laundry wastewater. The use of natural substitutes in treating wastewater has no harmful effects, and it is considered an effective step towards protecting the environment and promoting sustainability. Jar test experiments were conducted in order to determine the optimum conditions for the removal of surfactants, chemical oxygen demand (COD), biological oxygen demand (BOD), turbidity in terms of effective dosage, and pH control. The surfactant, COD, BOD, and turbidity removal efficiencies were 91.66%, 82.86%, 77.66%, and 85.14% at the optimum initial pH value of 6, the optimum dose of 2.5 g/L, and optimum mixing time of 25 minutes, respectively. It can be concluded that Artocarpus heterophyllus seed powder was a feasible and cost-effective natural coagulant for the removal of anionic surfactant from laundry wastewater. The results showed that the pseudo-second-order equation is the suitable model for this system.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"67 1","pages":"47-53"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81078953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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