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Articles by M. Mazaheri Assadi
Total Records ( 2 ) for M. Mazaheri Assadi
  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.
  S. Nasseri , M. Mazaheri Assadi , M. Noori Sepehr , Kh. Rostami , M. Shariat and K. Nadafi
  In tannery industries, Cr+3 is used for tanning animal hides. Three valence chromium reacts in specific conditions with existing organic compounds and manganese ions to change to hexavalent chromium which is considered hazardous for human health. Aspergillus oryzae grew in different dilutions (10-90%) of tanning house effluent (concentration of Cr+3 =120-1080 mg/L). The maximum chromium removal rate, (48.2%), was observed at pH= 3.3, Cr+3 concentration=240 mg/L and size of inoculum=0.12% (dry weight). Effects of various factors such as pH, temperature, shaking velocity and nutrients were also investigated. At optimum conditions (pH=5; temperature=30oC, shaking velocity= 150 rpm and nitrogen source of dihydrogen ammonium phosphate concentration=0.3%), biomass growth and chromium removal rate were found to be 0.45% of dry weight and 99.8%, respectively. Statistical studies on factors such as pH, temperature, shaking velocity, type and concentration of nutrients on the "biomass growth" and "residual chromium", showed that all the factors had significant effects.
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