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Articles by R. Nabizadeh
Total Records ( 9 ) for R. Nabizadeh
  M. Sadeghi , A. Mesdaghinia , A. Badkoubi , R. Nabizadeh and A. Khavanin
  The effectiveness of ozone treatment for improving the biodegradability of recalcitrant pollutants has been proved by investigating the ozonation reaction of Methyl tert-butyl ether (MTBE) a bioresistant gasoline oxygenate. Laboratory scale experiments have been carried out, at room temperature, by bubbling, for 120 min, ozonated air (3.4 ppm min¯1) into 3 liter of an alkaline (pH=11.5) aqueous solution (100 mg L¯1) of MTBE. The experimental results indicated that during the ozonation, complete MTBE degradation occurs in 100 min and after this time, ozone consumption goes on very slowly. At the end of the ozonation, after 100 min, the initial value of COD (256 mg O2 1) is 98 and correspond to a relative removal of about 62%.As for MTBE solution biodegradability expressed as (BOD5)/(COD) ratio, during the first 90 min its value regularly increases from lowest (0.01) up to a maximum of 0.68 that corresponds to an ozone consumption of 1.25 mg per each mg of COD initially present in the solution.The experimental results for determining the rate of MTBE removal due to stripping showed that about 14% of MTBE strips out after an hour of sparging with oxygen gas. The fraction of MTBE oxidized and/or striped increases to about 28% (in pH=7) and 70% (in pH=11.5) with ozonation over the same time period.
  M. Afkhami , M. Shariat , N. Jaafarzadeh , H. Ghadiri and R. Nabizadeh
  The Karun and Dez rivers basin are the largest rivers basin in Iran which are situated in the south west of the country. Karun River originates from Zagros mountain ranges and passing through Khuzestan plain, reaches the Persian Gulf. Several cities lie along its path of them the most important is Ahvaz, the center of Khuzestan province. To achieve water quality goals in Karun and Dez rivers, a water quality management model has been developed through the GIS approach and a mathematical water quality model. In Karun and Dez rivers, water quality has decreased due to heavy pollution loads from Khuzestan province cities and surrounding areas. In this survey, pollution sources, land use, geographic features and measured water quality data of the river basin were incorporated into the Arc-view geographic information system database. With the database, the model calculated management type and cost for each management project in the river basin. Until now, river management policy for polluted rivers in Iran has been first of all to get penalties from pollution sources and secondarily, to construct treatment plants for the pollution sources whose wastewater is released untreated and for which the wastewater quality goal of the Iranian Department of the Environment is not met. Different management projects with a time program were proposed and they were compared with the results of the river quality without any management approach. It became clear that the results based on the management approach were much better than those for the unmanaged condition from the viewpoint of the achievement of water quality goals and cost optimization.
  J. Nouri , A. H. Mahvi , M. Younesian , R. Nabizadeh and I. Hashemi
  At this study, an environmental impact assessment establishment of Shahzand Industrial Estate in Arak at the central part of Iran was investigated. After collection of data and analysis of the findings, the positive and negative impacts resulted from establishment of the industrial estate were investigated, using the Leopold Matrix and Scaling checklist methods providing the managerial solutions in order to minimize the environmental harmful impacts. The existing environmental situation was investigated and then environmental impact alternatives were determined. This was done regarding to the amount and kind of predicted pollutions for industrial estate at the construction and operational phases. The environmental impact assessment of the investigated estate was studied at the three terms of immediate, direct and indirect impacts at the short, medium and long term. By expanding of Leopold Matrix to four parted matrix, in addition to amount, importance and extend of the impacts, the remaining duration of impact in the environment were assessed as a separate factor in environmental impact assessment. The results of the study with two alternatives, such as; No (performance of the project with no concern for environmental issue) and as yes (performance of the project with application of the environmental harmful impacts) were studied in construction and operation phases. The impact assessment of "NO" property resulted (-1065), therefore the execution of project was rejected, but after reducing the harmful impact performance which were resulted (+1095) has been accepted. Therefore, method of reducing harmful environmental impacts along with environmental management programs introduced and accepted in this study.
  A. H. Mahvi , R. Nabizadeh , F. Gholami and A. Khairi
  The Cr (VI) adsorption characteristics of platanus orientalis leaves and their ash were examined as a function of contact time, initial pH and metal ion concentration. Batch adsorption experiments were performed. The effects of Ca2+, Mg2+, Na+ and K2+ on adsorption were studied. The effect of this adsorbent on COD in wastewater showed that 2g/L of adsorbent caused increase of 110mg/L and 76mg/L COD in deionized water in 120 minutes for platanus orientalis leaves and their ash , respectively. The maximum removal took place in the pH range of 6-7, contact time of 60 minutes and initial concentration of 2mg/L. Studies showed that the Freundlich adsorption model better fitted with the results than Langmuir with R2 > 0.85. The study showed platanus orientalis leaves ash was more favorable than living ones as well as in removing chromium from the aqueous solution.
  K. Naddafi , J. Nouri , R. Nabizadeh and N. Shahbod
  This paper studies the various resources (water, energy, paper) as well as other wastes consumption management at the National Library of Iran in Tehran. After setting the targets and specifying the correct management framework of resources consumption through the green management schedule, the resources analysis in consumption pattern in National Library of Iran was set up. Some attempt plans were performed to find out management solutions to the related issues. For the achievement of this aim, the first step was considered the study of general conditions of the Library through several visits, completing the checklists and questionnaires and then gathering the necessary information and analyzing them. The results of the fuel consumption in transportations related to the National Library showed that the major pollutants produced by the transportation were CO2, CO, NOx, and hydrocarbons. The rate of CO2 had a maximum level of 904 Kg and CO was 6 Kg, NOx was 2 Kg and hydrocarbons were 0.58 Kg. Among the equipments, which use energy in the Library, refrigerators produce the levels of CO2, SO2 and NOx .The total level of CO2, SO2 and NOx produced by all the equipments were 1140.32 Kg, 3.9072 kg and 2.886 Kg respectively. The results of water investigations showed that the total water consumption was 45459 L/year and the greater part of it was related to irrigation of the garden in the courtyard which was equal to 32471 L/year. Regarding to the wastes, the results of 30 times sampling showed the highest level to be related to aluminum and paper and a computer analysis revealed these results in the rates of 19745 Kg/year of CO2, 77.54 Kg/year, SO2 57.4Kg/year NOx and particulate matter was 2.92 Kg/year. Following the investigations carried out in management, executive solutions were suggested which led to the conclusion that the Green Management System should be established at this organization which should result in optimum consumption of resources such as water, power and paper in the National Library of Iran with considerable cost reduction.
  A. Eslami , S. Nasseri , B. Yadollahi , A. Mesdaghinia , F. Vaezi and R. Nabizadeh
  The oxygenate methyl tert-butyl ether is added to gasoline to increase the octane level and to reduce carbon monoxide and hydrocarbon emissions by vehicles. The high mobility, water solubility, and resistance to natural attenuation associated with methyl tert-butyl ether may result in contamination of ground and surface waters. In this research the degradation of aqueous methyl tert-butyl ether at relatively high concentrations was investigated by UV-vis/TiO2/H2O2 photocatalytic process. The effect of important operational parameters such as pH, amount of H2O2, catalyst loading, and irradiation time were also studied. Concentrations of methyl tert-butyl ether and intermediates such as tert-butyl formate and tert-butyl alcohol were measured over a 180 min period using a gas chromatograph equipped with flame ionization detector and combined with headspace sampler. Results showed that the time required for complete degradation increased from 30 to 180min, when the initial concentration was increased from 10 to 500mg/L. The first order rate constant for degradation of methyl tert-butyl ether from the hydroxyl radical was estimated to be 0.177 to 0.022 1/min as the concentration increased from 10 to 500mg/L. Study on the overall mineralization monitored by total organic carbon (TOC) analysis showed that in the initial concentration of 100mg/L methyl tert-butyl ether, complete mineralization was obtained after 110min under UV-vis/TiO2/H2O2 photocatalytic process.
  G.H. Moosavi , K. Naddafi , A.R. Mesdaghinia and R. Nabizadeh
  The aim of present study was to design and construct an Up-flow Anaerobic/Aerobic Fixed Bed (UA/AFB) combined reactor in which an anaerobic and aerobic zones could run in a single reactor to study simultaneously carbon and nutrient removal. The UA/AFB developed reactor was made from Plexiglas plate consisting of two main lower anaerobic and upper aerobic parts. A synthetic wastewater was prepared in concentrations which were close to those found in municipal wastewaters. After developing the biofilm on the media, reactor was operated at 5 different HRTs ranging from 5 to 24 h. Samples collected at any HRTs from influent and sampling ports in steady state condition were analyzed according to standard methods for COD, NH3 , NO-3, PO4-3, alkalinity and pH. The obtained results showed that the HRT of 7 h was suitable for simultaneous removal of COD, nitrification and denitrification. In this HRT efficiencies are 95.4, 94 and 94.5% for COD removal, nitrification and denitrification, respectively. The reactor did not show good performance in phosphorus removal.
  G.H.R. Jahed Khaniki , F. Vaezi , M. Yunesian , R. Nabizadeh and G.H.A. Paseban
  The objective of this study is evaluation of direct pH metery and alkalinity measurement methods for determination of baking soda in lavash bread (a kind of flat bread) in order to introduce and recommend a good practice of control. For running the experiments, various samples of lavash bread having different concentrations of baking soda were prepared. Ten grams of each sample were mixed with distilled water and then the prepared solutions were filtrated. The filtrates were then analyzed for pH and total alkalinity according to the distractions described in Standard Methods. Results show a significant correlation between the pH values of bread samples and the amount of baking soda. Also, a positive correlation has been observed between the alkalinity of bread samples and used baking soda. By comparing the R2-values specified for these two methods it could be concluded that the direct pH metery method is more reasonable. Furthermore, by this simple method it is possible to accelerate the detection of minute amounts of this chemical in bread.
  H. Izanloo , A. Mesdaghinia , R. Nabizadeh , K. Naddafi , S. Nasseri , A.M. Mahv and S. Nazmara
  An aerated submerged fixed-film (ASFF) bioreactor was developed to treat an artificial wastewater based on crude oil. Bee-Cell 2000 was used as support media having porosity of 87% and a specific surface area of 650 m2 m-3. The system was able to achieve 70.87-93.12% removal efficiencies of Chemical Oxygen Demand (COD) in the organic loading rate range of 1.310 to 15.797 g COD m-2 day-1. Data gained exhibited that the effluent COD concentration ranged between 68.68 and 292.60 mg L-1 at organic loadings experienced. Therefore, an ASFF process showed that it was feasible to treat high oily wastewater in order to meet the discharge standards.
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