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Articles by K. Naddafi
Total Records ( 9 ) for K. Naddafi
  S. Mamisahebei , Gh. R. Jahed Khaniki , A. Torabian , S. Nasseri and K. Naddafi
  Arsenic contamination in water poses a serious threat on human health. The tea fungus known as Kombucha is a waste produced during black tea fermentation. The objective of this study was to examine the main aspect of a possible strategy for the removal of arsenates employing tea fungal biomass. The pretreatment of biomass with FeCl3 was found to improve the biosorption efficiency. Arsenics uptake was found to be rapid for all concentrations and reached to 79% of equilibrium capacity of biosorption in 20 min and reached equilibrium in 90 min. The pseudo second-order and first-order models described the biosorption kinetics of As (V) with good correlation coefficient (R2>0.93) and better than the other equations. The data obtained from the experiment of biosorption isotherm were analyzed using the Freundlich and Langmuir isotherm models. The equation described the isotherm of As (V) biosorption with relatively high correlation coefficient (R2>0.93). According to the Langmuir model, the maximum uptake capacities (qm) of tea fungal biomass for As (V) were obtained 3.98x10-3 mmol/gr. The effect of Na+, K+, Mg+2 and Ca+2 on equilibrium capacities of As was not significant. The variation of sorption efficiency with pH showed that optimum biosorption takes place in the pH ranges of 6 to 8. Promising results were obtained in laboratory experiments and effective As (V) removals were observed.
  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.
  S. Nasseri , M. Dehghani , S. Amin , K. Naddafi and Z. Zamanian
  Atrazine, a herbicide widely used in corn production, is frequently detected as pesticide in water resources. In this research, four agricultural fields with a long history of atrazine application in Shiraz and its vicinity in Fars province of Iran, have been studied to determine the fate of atrazine through the passage of time. These four farms were cultivated under a crop rotation (corn-wheat) during the past 10 years. Samples were collected from four soil profiles of 0-10, 10-20, 20-40, and 40-60 cm soil depth at different times. The time intervals for soil sampling started before atrazine application and continued until no atrazine was detected. According to the general linear model, there was no significant difference between atrazine residual concentrations and the soil moisture and depth (p≥0.05). But, significant difference between atrazine residual concentrations and the sampling regions was observed (p<0.001). Based on the data, atrazine leaching and dissipation rate in different soil profiles in the four sampling regions were high and significant. Therefore, there is a high risk of atrazine pollution in groundwater resources of the region.
  R. Rostami , K. Naddafi , A. Aghamohamadi , H. Najafi saleh and M. Fazlzadeh davil
  Different food products such as corn, wheat and peanut have shown high potential to be contaminated in suitable environmental conditions, such as temperature and humidity. Some fungi can produce toxins, like Aflatoxin, and some of them are carcinogen. The purpose of this research was to study fungal contamination in peanuts being sold in the BAZAR of the city of Zanjan. 20 samples of 50g roasted and salted peanuts and 16 samples of 50g unsalted peanuts (pure) were collected from Zanjan BAZAR. Ambient conditions such as light intensity, temperature and air flow of the BAZAR and also the relative humidity of peanuts were measured. Samples were analyzed for fungal colony and were identified using slide culture technique. Results showed that Mold fungi were dominant among the colonies as. Aspergillus flavus (39.1%), Penicillium (9.2%), Rhizopus (7.2%), Mucor (2.5%), Alternaria (1.03%) and Nigrospora (0.5%). Temperature and the samples relative humidity were higher than the standard range. The results indicated a significant relation between relative humidity, light intensity, temperature and peanuts' type (pure or salted) with level of fungal contamination. Also, roasting and processing reduced the relative humidity of peanuts and the level of contamination. Hence roasting, salting and provision of appropriate ambient conditions can be useful to peanut storage.
  S. Mazloomi , R. Nabizadh , S. Nasseri , K. Naddafi , S. Nazmara and A.H. Mahvi
  The reaction of disinfectants with natural organic materials (NOM) existing in water lead to the formation of Disinfection By-Products. Potentially hazardous and carcinogenic characteristics of THMs recognized. Thus removal of THMs or THMs precursor is necessary for human health the aim of this study was to research of efficiency of domestic reverse osmosis (RO) in removal of trihalomethanes (THMs) from drinking water. In this study was used pilot scale of RO system with Polyamide membrane as Spiral-Wound, Tape wrapping module. Feed solution was made by using of pure chloroform. The samples containing chloroform were analyzed using a gas chromatograph, which equipped with a flame ionization detector. By increasing the flow, the removal rate of chloroform decrease and with declining removal of EC, the removal of chloroform was declined too. In this research, at worst condition, the efficiency of the pilot scale reverse osmosis reached to 80 % removal of chloroform.
  M. Mohammadian Fazli , A. R. Mesdaghinia , K. Naddafi , S. Nasseri , M. Yunesian , M. Mazaheri Assadi , S. Rezaie and H. Hamzehei
  Synthetic dyes are extensively used in different industries. Dyes have adverse impacts such as visual effects, chemical oxygen demand, toxicity, mutagenicity and carcinogenicity characteristics. White rot fungi, due to extracellular enzyme system, are capable to degrade dyes and various xenobiotics. The aim of this study was to optimize decolorization of reactive blue 19 (RB19) dye using Ganoderma sp. fungus. Response Surface Methodology (RSM) was used to study the effect of independent variables, namely glycerol concentration (15, 20 and 25 g/L), temperature (27, 30 and 33 °C) and pH (5.5, 6.0 and 6.5) on color removal efficiency in aqueous solution. From RSM-generated model, the optimum conditions for RB19 decolorization were identified to be at temperature of 27°C, glycerol concentration of 19.14 mg/L and pH=6.3. At the optimum conditions, predicted decolorization was 95.3 percent. The confirmatory experiments were conducted and confirmed the results by 94.89% color removal. Thus, this statistical approach enabled to improve reactive blue 19 decolorization process by Ganoderma sp. up to 1.27 times higher than non-optimized conditions.
  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.
  K. Naddafi , M. Zamanzadeh , A. A. Azimi , G. A. Omrani , A. R. Mesdaghinia and E. Mobedi
  The effect of temperature, dry solids and C/N ratio on the growth of E. fetida and on vermicomposting of waste activated sludge was studied in a small-scale laboratory experiments. The maximum growth rate in 25°C, 15-20% dry solids and a C/N ratio of 15 were 19±1, 21±2 and 20±2 mg/worm/day, respectively. Moreover, changes in the physicochemical properties of the produced vermicasts were assessed. The highest VS reduction (18%) occurred in dry solids of 15% and in a C/N ratio of 25 the maximum VS reduction was 17%. TKN decreased with increase in dry solids by the end of vermicomposting process, while the highest organic to mineral P reduction occurred in the dry solids of 15%. The results for different levels of C/N ratio showed that TKN and organic to mineral P of the worm-worked waste activated sludge decreased with increase in C/N ratio. The pH of the produced vermicompost in different levels of dry solids and C/N ratio increased in all the experiments.
  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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