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Articles by F. Vaezi
Total Records ( 8 ) for F. Vaezi
  A.H. Mahvi , F. Vaezi , A. Balodor and S. Nasseri
  In this study, the technological strategies for discharging the industrial complex waste into the MWTP have been reviewed. There are more than 200 industrial complexes in Iran and among these, Toos Industrial Complex of Mashhad City at the north part of the Country is one of the largest and is also considered to be the most active one. Nearly all types of industries have been gathered and put into operation at this Complex (totally 488 industrial plants, 154 of which are now under operation). According to the results, the mean volume of the industrial wastewater produced and the overall conversion factor were determined to be 2691.8 m3d-l and 73%, respectively. The study has continued after organizing a pilot plant in the vicinity of the complex for accomplishing the centralized pretreatment of the wastes with the aid of various chemicals (lime and FeO3). Inspecting the work of the pilot plant has revealed that the removal rates of pollutants were 27 to 53% for BODS` 25 to 59% for COD and 46 to 94% for TSS. These removal levels were enough to make the remained load of industrial wastes qualified for discharge into MWTP. The final conclusion was that all the problems could be solved by taking advantage of CEPT for Toos industrial wastewaters.
  A.H. Mahvi , M.H. Dehghani and F. Vaezi
  The effect of ultrasonic upon the destruction of total coliforms has been studied in this research. Also, the impact of power intensity and ultrasonic frequency on the germicidal effectiveness of sonification has been explored. The results obtained from the work carried out have shown that ultrasonic can be used effectively for water disinfection and increase in percent kill for coliforms may occur with increase in contact time to ultrasonic in the 42 kHz. These results suggest that ultrasonic in this frequency is capable to some degree in inactivating total coliforms in water.
  H. Kamani , F. Vaezi , R. Nabizadeh , A.R. Mesdaghinia and M. Alimohammadi
  UV disinfect ion has gained widespread use for municipal wastewater and more recently, interest in using UV for water reuse applications has increased too. Medium pressure lamp has emerged as a viable alternative and is beginning to gain more popularity than the conventional low-pressure lamps. This study has been performed with the objective of utilizing MP lamp for the disinfection stage of wastewater from a milk industry. The lab-scale UV submerged system used in the experiments was a single-lamp reactor with 3 L volume, which was operated at two contact times. Two MP lamps of 300 and 400 W had been used separately. Results indicated that for disinfection of all the samples with different %T, meeting the goal of 1000 MPN /100 mL or less was always possible. Besides, for 95% of these samples, the MPN of irradiated effluents had reached to less than 240/100 mL. Another conclusion is that by use of 400 W lamp, all the samples are well disinfected to 100 total coli forms or less per 100 mL and so are become ready for most applications of water reuse programs.
  G.R. Moosavi , K. Naddafi , A. Mesdaghinia , F. Vaezi and M. Mahmoudi
  The liquid-gas absorption is by far the most applied system for odor control. A bench scale packed bed scrubber was used to evaluate of H2S removal as the odorant model compound using three chemical oxidants of NaClO, H2O2 and KMnO4 at various operation conditions. Results showed that more than 99.5% of the H2S was removed from the inlet air in the EBCTs of 3 to 35 s and H2S concentrations in the range of 30 to 300 ppmv. Also, the pressure drop across the bed of the reactor increased from 1.5 to 13.1 cm H2O m-1 for the superficial air velocities in the range of 1.2 to 14 m min-1 which a linear relationship was observed between pressure drop and superficial air velocities.
  G.R. Moosavi , A.R. Mesdaghinia , K. Naddafi , F. Vaezi and R. Nabizadeh
  Odor control is a severe problem common to most wastewater operations particularly significant at urban treatment plants, gas and oil refineries, paper and pulp industries, etc. The most commonly reported odorous compound in POTW off-gases is hydrogen sulfide (H2S) which has a very low odor threshold. These odorous emissions can cause a nuisance to adjacent populations and contribute significantly to atmospheric pollution. Waste gases have traditionally been treated using physicochemical processes, such as scrubbing, adsorption, condensation and oxidation, however biological treatment of waste gasses has gain support as an effective and economical option in the past few decades. Some studies have been done on biological systems to control of waste air containing H2S, although no review on these systems have been reported in the literature. This study reviews available data regarding the performance of biological systems to treat off-gases containing H2S.
  A.H. Mahvi , F. Vaezi and N. Alavi
  A laboratory adsorption study had been conducted to evaluate the feasibility of adsorption by GAC for removing detergents from the secondary effluent of a municipal wastewater treatment plant (Ghods in Tehran). The configuration used for GAC application was a single-down-flow fixed bed column with 80 cm effective height. Samples were collected in six successive stages during six months and were passed through the GAC column at a volumetric flow rate of 8 L h-1. Detergent concentrations had been determined by a standard spectrophotometer method called methylene blue active substances and reported as mg L-1 MBAS. Results showed that detergent removal ranges from 38.8 to 50%. Although this level of efficiency shouldn`t be considered good but was quite sufficient for polishing the effluent samples studied, mainly because of the insignificant initial concentrations. Results also revealed that adsorption of detergent on GAC can be better described by Freundlich isotherm.
  D. Naghipoor Khalkhaliani , A.R. Mesdaghinia , A.H. Mahvi , J. Nouri and F. Vaezi
  This study provides an evaluation of EDTA solution for the removal of lead, zinc and cadmium from a contaminated soil. The field soil contained 68% sand, 12% clay and 20% silt. The performance of EDTA for the treatment of soil contaminated with heavy metals was evaluated in this study. Soil samples containing variable levels of Pb, Zn, Cd were subjected to Ethylene Diamin Tetra-acetic Acid (EDTA) treatment and the extraction of heavy metals was found to vary, ranging from 54.5 to 100%. Thus the feasibility of soil washing for the decontaminated sandy-loam soil with single and several metals were evaluated in laboratory-scale batch experiments. Of the washing reagent test, Na2- EDTA 0.1 M solutions were generally more effective for removing heavy metals from soils. Na2-EDTA 0.1M preferentially extracted lead over cadmium and zinc. The most efficient washing occurred using the 0.1M EDTA at the lowest pH.
  M.H. Dehghani , Gh. Jahed and F. Vaezi
  The primary aim of this study was to investigate the effect of ultrasonic reactor (USR) at different sonication times on HPC. Heterotrophs are broadly defined as microorganisms that require organic carbon for growth. A variety of simple culture-based tests, which are intended to recover a wide range of microorganisms from water, are collectively referred to as heterotrophic plate count or HPC. USR is able to inactivate bacteria through a number of physical, mechanical and chemical effects arising from acoustic cavitation. Results showed that a significant increase in percent kill for HPC bacteria with increasing duration of sonication in 42 kHz after 90 min sonication.
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