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Search Results: 1 - 10 of 1238 matches for " Mahdi Farzadkia "
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Investigation of methane emission potential for municipal solid waste landfill sites in Iran and declining approaches 2008
Mahdi Farzadkia,Mostafa Karimaee,Mohammad Amin Karami
Electronic Physician , 2011,
Abstract: Objective: The objective of this study was to investigation of methane emission potential for municipal solid wastelandfill sites in Iran and declining approaches.Methods: In this study methane emission rate from MSW landfill sites in Iran was estimated by IPCC (2000)method. Also emitted methane amounts from three different scenarios of MSW land filling and recycling have beensurveyed in Iran.Results: The results showed that methane emission rate from unsanitary MSW landfill site in existence situation of(first scenario) was 1.682 million ton per year which would be equal with 162.7 kilo gram of methane per ton ofburied MSW. In this scenario, methane emission portion from MSW landfill sites on Iran in comparison to globalrate was 4.67 percent.Conclusion: Based on the results, in first scenario if MSW land fill sites became sanitized and methane recoveryfrom these sites carried out (second scenario) methane emission would be reduced to rate of 0.7 million ton per year.Also appropriate recycling of MSW in Iran up to 80 percent and land filling of residual solid waste with recoveringof generated methane (third scenario) was reduced methane emission to rate of 0.158 million ton per year. So, it hasbeen recommended intensively that sanitary land filling processes and appropriate MSW recycling would beconsidered as two significantly important actions for methane emission decreasing on Iran MSW landfill sites.
Comparison of Aerobic and Lime Stabilization Methods for Evaluation of Sewage Sludge Reuse
Akram Jamal,Nafise Norieh,Mahdi Farzadkia
Journal of Environmental Science and Technology , 2011,
Abstract: The main objective of this research was the examination of effectiveness of lime dose in order to stabilization of sewage sludge and comparison of lime stabilized sludge reuse with aerobic digested sludge reuse. Lime and aerobic stabilization were carried out in two laboratory reactor with 40 L capacity. The sludge samples were taken from the return activated sludge line in four times. Lime was used at various ratios and the mixture was stabilized for 30 days. During the lime hydrated stabilization pH values were significantly increased from 7 to 12.5. Also, aerobic digester was loaded with raw sludge and mixed by sufficient amount of air for 30 days. The results indicate that the lime addition with the dose of 0.4 g Ca(OH)2 g-1 DS could completely inactive a high amount of fecal coliforms within 1 h and in all of the times was lower than 1000 MPN g-1 DS after 30 days (p<0.01). But after 30 days, fecal coliforms density in aerobic digested sludge could not achieve to Class A of USEPA category. In two stabilization methods, density of viable helminths ova could not reduce to 1 ova/4 g DS and could not achieve to Class A of USEPA category. Therefore, these methods could be achieved the reduction requirement set by USEPA for class B (p<0.01) and the products could be well used as a landfill cover or a soil conditioner. Finally, our study confirmed that lime sludge stabilization has a higher hygienic effect and more cost-effective than aerobic stabilization, specially, when such sludge is used to dung and modify acid soils.
The Impact of Exited Pollutants of Cement Plant on the Soil and Leaves of Trees Species: A Case Study in Golestan Province  [PDF]
Mahdi Farzadkia, Mitra Gholami, Ehsan Abouee, Zahra Asadgol, Shahram Sadeghi, Hossein Arfaeinia, Maryam Noradini
Open Journal of Ecology (OJE) , 2016, DOI: 10.4236/oje.2016.67038
Abstract: Background & Aims: Cement industry is very contaminated. Contaminants resulting from industries include dust, carbon compounds, sulfur and nitrogen. The purpose of this study was to evaluate the output of pollutants from cement plants in soil samples and leaf tree species. Methods: This study descriptive-analytic was designed tree species, plants and soil around the plant. Samples from four different stations within 500 meters of factory and 21 packages (each package contains three examples of the sample) were sent for laboratory tasks. Information of sampling stations in the soil, the plants and factories of qualitative and quantitative tests on samples of soil pollutants output of factories, plant species and trees daily and using written lists were collected. After the sampling, the samples were measured using standard methods and analyzed using statistical software. Results: Distribution of the total amount of metals in oak and black plants and reed Talo is normal and can be used for parametric tests. Also, there is no significant relationship statistically among the total amount of metals in plants such as oak trees, reed and Siah Talo. Conclusions: According to the findings of this study, we can conclude that dust subsides the leaves of three species of oak and black Talo and reed which contain considerable concentrations of metals such as silver, barium, bismuth, cesium, chromium, cobalt, cadmium and arsenic.
Effectiveness of Rice Husk Ash in Removal of Phenolic Compounds from Aqueous Solutions, Equilibrium and Kinetics Studies
Majid Kermani,Mitra Gholami,Abdolmajid Gholizade,Mahdi Farzadkia
Iranian Journal of Health and Environment , 2012,
Abstract: Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 Background and Objectives: Phenols in trace quantities are usually present in the treated effluent of many wastewater-treatment plants. Phenol compounds even at low concentration can cause toxicity, health and significant taste and odor problem in drinking waters. This research focuses on understanding the sorption process and developing a cost-effective technology for the treatment of water contaminated with phenolic compounds, which are discharged into the aquatic environment from a variety of sources. In order to remove phenolic compounds from water, a new natural sorbent, rice husk ash, was developed.Materials and Methods: Removal of phenol, 2-chlorophenol and 4-chlorophenol were characterized by spectrophotometric technique at wavelengths of 269.5, 274 and 280 nm, respectively, under batch equilibrium conditions and via changing the parameters of contact time, initial pH, and initial concentration of adsorbates and dosages of sorbent. Finally, the results were analyzed by the kinetic and isotherm models.Results: in this study, the equilibrium time was found to be 240 min for full equilibration of adsorbates. Removal percent of 2-chlorophenol was lower than two others. The maximum removal of phenol, 2-CP and 4-CP was observed at an initial pH of 5. The percentage removal of these phenolic compounds increased with increasing adsorbent dose and decreasing initial concentration. In kinetics studies, correlation coefficient and ARE factor showed that the sorption of phenol (R2=0.9999), 2-chlorophenol (R2=0.9992) and 4-chlorophenol (R2=1) fitted by pseudo second order model. Isotherm studies also revealed that, Langmuirmodel for phenol (R2=0.9499), Freundlich model for 2-chlorophenol (R2=0.9659) and 4-chlorophenol (R2=0.9542) were the best choices to describe the sorption behaviors.Conclusion: Sorption process is highly dependent on the pH and it affects adsorbent surface characteristics, the degree of ionization and removal efficiency. At high pH hydroxide ions (OH-) compete for adsorption sites with phenol molecules. The sorption was done rapidly and a plateau was reached indicating the sorption sites occuupied till they were saturated. Since the increasing sorbent dose would improve sorption site, its increasing enhances phenolic compounds removal. st1":*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso
Sludge reduction by lumbriculus variegatus in Ahvas wastewater treatment plant
Basim Yalda,Farzadkia Mahdi,Jaafarzadeh Nematollah,Hendrickx Tim
Iranian Journal of Environmental Health Science & Engineering , 2012, DOI: 10.1186/1735-2746-9-4
Abstract: Sludge production is an avoidable problem arising from the treatment of wastewater. The sludge remained after municipal wastewater treatment contains considerable amounts of various contaminants and if is not properly handled and disposed, it may produce extensive health hazards. Application of aquatic worm is an approach to decrease the amount of biological waste sludge produced in wastewater treatment plants. In the present research reduction of the amount of waste sludge from Ahvaz wastewater treatment plant was studied with the aquatic worm Lumbriculus variegatus in a reactor concept. The sludge reduction in the reactor with worm was compared to sludge reduction in a blank reactor (without worm). The effects of changes in dissolved oxygen (DO) concentration up to 3 mg/L (run 1) and up to 6 mg/L (run 2) were studied in the worm and blank reactors. No meaningful relationship was found between DO concentration and the rate of total suspended solids reduction. The average sludge reductions were obtained as 32% (run 1) and 33% (run 2) in worm reactor and 16% (run 1) and 12% (run 2) in the blank reactor. These results showed that the worm reactors may reduce the waste sludge between 2 and 2.75 times higher than in the blank conditions. The obtained results showed that the worm reactor has a high potential for use in large-scale sludge processing.
Sludge Reduction by Lumbriculus Variegatus in Ahvaz Wastewater Treatment Plant
Yalda Basim,Mahdi Farzadkia,Nematollah Jaafarzadeh,Tim Hendrickx
Iranian Journal of Environmental Health Science & Engineering , 2012,
Abstract: Sludge production is an avoidable problem arising from the treatment of wastewater. The sludge remained after municipal wastewater treatment contains considerable amounts of various contaminants and if is not properly handled and disposed, it may produce extensivehealth hazards. Application of aquatic worm is an approach to decrease the amount of biological waste sludge produced in wastewater treatment plants. In the present research reduction of the amount of waste sludge from Ahvaz wastewater treatment plant was studied with the aquatic worm Lumbriculus variegatus in a reactor concept. The sludge reduction in the reactor with worm was compared to sludge reduction in a blank reactor (without worm).The effects of changes in dissolved oxygen (DO) concentration up to 3 mg/L (run 1) and up to 6 mg/L (run 2) were studied in the worm and blank reactors. No meaningful relationship was found between DO concentration and the rate of total suspended solids reduction. Theaverage sludge reductions were obtained as 33% (run 2) and 32% (run 1) in worm reactor,and 16% (run 1) and 12% (run 2) in the blank reactor. These results showed that the worm reactors may reduce the waste sludge between 2 and 2.75 times higher than in the blankconditions. The obtained results showed that the worm reactor has a high potential for use in large-scale sludge processing.
Arsenic Removal from Aqueous Solutions by Salvadora persica Stem Ash
Ferdos Kord Mostafapour,Edris Bazrafshan,Mahdi Farzadkia,Samira Amini
Journal of Chemistry , 2013, DOI: 10.1155/2013/740847
Abstract:
Catalytic Ozonation of Phenolic Wastewater: Identification and Toxicity of Intermediates
Mahdi Farzadkia,Yousef Dadban Shahamat,Simin Nasseri,Amir Hossein Mahvi,Mitra Gholami,Ali Shahryari
Journal of Engineering , 2014, DOI: 10.1155/2014/520929
Abstract: A new strategy in catalytic ozonation removal method for degradation and detoxification of phenol from industrial wastewater was investigated. Magnetic carbon nanocomposite, as a novel catalyst, was synthesized and then used in the catalytic ozonation process (COP) and the effects of operational conditions such as initial pH, reaction time, and initial concentration of phenol on the degradation efficiency and the toxicity assay have been investigated. The results showed that the highest catalytic potential was achieved at optimal neutral pH and the removal efficiency of phenol and COD is 98.5% and 69.8%, respectively. First-order modeling demonstrated that the reactions were dependent on the initial concentration of phenol, with kinetic constants varying from 0.038?min?1??([phenol]o = 1500?mg/L) to 1.273?min?1 ([phenol]o = 50?mg/L). Bioassay analysis showed that phenol was highly toxic to Daphnia magna (LC50 96? ?mg/L). Comparison of toxicity units (TU) of row wastewater (36.01) and the treated effluent showed that TU value, after slightly increasing in the first steps of ozonation for construction of more toxic intermediates, severely reduced at the end of reaction (2.23). Thus, COP was able to effectively remove the toxicity of intermediates which were formed during the chemical oxidation of phenolic wastewaters. 1. Introduction phenol is a hazardous contaminant and classified as a toxic and priority hazardous contaminant in the list of USEPA [1], which can be found in aqueous effluents from various industries such as the petrochemical plants, petroleum refineries, manufacturing of resins and plastics, steel production, coal conversion, surface runoff from coal mines, dyestuff, tanning, paint stripping operations, pulp and paper, pesticides, pharmaceuticals, medications, and food processing industries [2, 3]; Environmental Protection Agency has limited this contaminant concentration in surface waters to less than 1 ppb [4]. Due to its toxicity and hazardous character and an increasing social concern on environment, it is required to be removed prior to discharging to the environment. Therefore, because the traditional methods of treatment of phenolic wastewaters such as physical and biological processes are not sufficient and have their own limitations, there is a need to use effective strategies of treatment. Many investigations are available regarding the use of advanced oxidation processes (AOPs) such as ultrasonic, photooxidation, photocatalytic oxidation plasma, Fenton, photo-Fenton, wet oxidation, and ozone/ultraviolet (UV) for the degradation
Towards Economic Single-Phase Motor  [PDF]
Mahdi Alshamasin
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.59058
Abstract:

Studying of operation balance in single-phase induction motors is an issue of interest due to the need for reducing the power consumption and increasing the motors’ life. The paper focuses on improving the motor performance by balancing the stator phase operation for the most common-used connection diagrams of single-phase capacitor-run induction motors (SPCRIMs) and three-phase induction motors (TPIMs) operating from single-phase supply (SPS). Therefore, a mathematical model is used to balance the motor operation by varying the frequency supply voltage. Characteristics of balancing parameters are investigated, various methods of motor balancing are presented and comparisons were done among these balancing methods.

Evaluation of Sludge Management in Sewage Treatment Plant in Hamadan Province
M. Farzadkia,H. Taher khani
Journal of Mazandaran University of Medical Sciences , 2005,
Abstract: Background and purpose : Currently, there is only one sewage treatment plant in Sercan City in Hamadan province. Extended aeration activated sludge is the main process of the plant and untreated effluent and disposal sludge are used for agricultural activities. The main objective of this research is to evaluate the stabilization degree and reuse potential of disposal sludge from the plant.Materials and methods : This study was undertaken over a 12 months period from March 2001 to March 2002. In this project some indexes of sludge stabilization and reuse including VS/TS ratio, pH, SOUR, floatation, color, odor, coliform and fecal coliform were determined.Results : The annual average ratio of VS/TS and SOUR in disposal sludge from this plant were 0.73 and 3.37 mg02/gr.vs.h, respectively. The average pH was about 7. The disposal sludge was septic and had dark brown color and floated after a short time. Also the annual average of fecal coliform density in disposal sludge was 8.97 ′ 107 MPN/g.ds.Conclusion : The disposal sludge was raw and destabilized. The microbial quality of disposal sludge was lower than the class B of USEPA regulation. Therefore, this sludge can not be discharged to environment or reused.
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