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Articles by A.H. Mahvi
Total Records ( 13 ) for A.H. Mahvi
  A.A. Babaei Babaei , A.H. Mahvi , J.Nouri , E. Ahmadpour and F. Mohsenzadeh
  The objective of this study was to evaluate and map regional patterns of two macro elements (Fe and Mn) and two micro elements (Pb and Cr), that all of these grouped as heavy metals, occurrence in ground water. The study was performed in Shush and Andimeshk plains in the south part of Iran, with high agricultural activities that cover an area of 1100 km2 between the Dez and Karkhe rivers. This region was divided into four sub-regions A, B, C and D. Additionally 168 groundwater samples were collected from 42 water wells during the months April, May, August and September of 2004. The Flame Atomic Absorption Spectrometry (AAS-Flame) was used to measure the heavy metals concentration in water samples. The results demonstrated that all of the samples, Fe and Cr concentrations have been shown below the WHO guidelines, but Mn and Pb contents of 7.1 and 40.5% of all samples was higher than WHO guidelines respectively. The Fe concentration is more pronounced in north part than southern part but groundwater Mn and Pb contents in south part is higher than northern part of studied area. The Cr contents of groundwater in studied area not follow particular pattern but its concentration was higher in sub-regions B and D compared to sub-regions A and C. Absent confining layers, proximity to land surface, excess agricultural and industrial activities in south part and groundwater flow direction that is generally from north to south parts in this area makes south region of Shush plain especially vulnerable to heavy metals pollution and other contaminants.
  G.R. Moosavi , A.R. Mesdaghinia , K. Naddafi , A.H. Mahvi and J. Nouri
  Research was carried out in order to investigate the effect of the organic loading rate on the performance of an up-flow anaerobic/aerobic fixed-bed (UA/AFB) combined reactor. One bench scale UA/AFB combined reactor was constructed to investigate the treatment of high strength wastewater. Reactor was based on the combination of anaerobic and aerobic parts only in a single reactor. It was operated under four different runs in which organic loads were 0.8, 2.3, 4.7 and 7.6 kg COD/m3 d, respectively. It was found that the total HRT 9 h (5 h as anaerobic and 4 h as aerobic) is long enough to obtain efficient removal of COD more than 95% at all of runs. Also, investigated reactor showed high ability to control organic loads. Based on the observed results, the use of UA/AFB reactor in practice seems to be a potential biotechnology for treatment of industrial wastewater contain high organic load.
  M.A. Zazouli , S. Nasseri , A.H. Mahvi , A.R. Mesdaghinia , M. Younecian and M. Gholami
  The aim of this research was to determine hydrophobic and hydrophilic fractions of Natural Organic Matter (NOMs) in drinking water Sources of Tehran. Water sampling was conducted monthly from Aug 2006 to Jan 2007 in two drinking water treatment plants (Jalalieh and Tehranpars) in Tehran. Quantitative parameters of pH, EC, UV254 and DOC were studied based on standard methods. The XAD-7 resin method was used for fractionation of NOM. Results showed that NOM concentrations in Jalalieh and Tehranpars water treatment plants were 2.47 and 1.63 mg L-1, respectively. The mean of total percent of HPO (hydrophobic) and HPI (hydrophilic) fractions were about 41 and 59%, respectively. Since the hydrophobic NOM fraction exhibits higher trihalomethane formation potential (THMFP) than hydrophilic NOM, Tehran water chlorination exhibits higher THMFP than halo acetic acid formation potential (HAAFP). The information obtained from this study may be further employed in the design of the control technique and management strategies for the water treatment plant, especially for DBPs reduction.
  A.H. Mahvi , M.A. Zazoli , M. Younecian , B. Nicpour and A. Babapour
  The aim of this study was to determine DMFT index (Decayed, Missing and Filled Teeth) in the 12 years old students in Behshar city and to determine the fluoride concentration in drinking water Sources. The survey was performed using the cross-sectional method on 300 students’ selected using multi-stage sampling . The DMFT index of permanent teeth was determined, using its standard methods recommended by world Health organization. The water fluoride level was estimated in water supplies, using SPANDS method. The Annual Mean Maximum Temperature (AAMT) recorded during the last two yeas were Collected from the meteorological Center. A total number of 300 students (50% boys and 50% girls) aged 12 years and 120 water samples were assessed. The results showed that mean fluoride concentration of drinking water during one year was 0.25 ppm, which Less than normal level. The average AMMT of behshar city is 22±4°C at which the optimal fluoride in drinking water of Behshar using Galagan and Vermillion equation was calculated to be 0.8 ppm. The mean DMFT value was 1.48±0.13 and was higher in girls in comparison with boys. Results indicate that the availability of other sources of fluoride must also be considered and taken into account in the planning of programs in public health dentistry.
  A.H. Mahvi , Hadi Dehghani and E.B.Kia
  Application of ultrasonic irradiation for inactivation of nematodes was investigated. Experiments show that it is possible to decrease the number of organisms present in the water and that the process depends on exposure time, frequency and intensity of the ultrasound irradiation, as well as on the type of organisms. As it is considered by 2, 4, 6, 8 ,10 and 12 min of sonication about 23.75, 42.50, 53.5, 82.25, 89.25 and 100% of the adult present are destroyed, respectively. But by 2, 4, 6 and 8 min of sonication about 38.0, 50.5, 58.75 and 100% of the larva present are destroyed, respectively. The results using Bransonic bath at 42 kHz (155 W input power) show that using this frequency it would appear that 100% of the nematodes adult and larva are destroyed in 12 and 8 min, respectively.
  M. Farzadkia and A.H. Mahvi
  This study was conducted to disposal biosolids from Serkan sewage treatment plant and lime stabilized biosolids, from April 2002 to March 2003. Lime stabilization of biosolids was performed in the reactor with 30-liter capacity at Hamadan medical sciences university. Average amounts of VS/TS ratio, SOUR, fecal coliform and viable helminth ova density in disposal biosolids from Serkan treatment plant were 0.754, 3.395 mg.02/g.vs.h, 1.93x108 MPN/g of dry solids and 1100 ova/4 g of dry solids, respectively. By lime addition ratio about 0.4 g Ca(OH)2 /g of dry solids of biosolids, pH was not dropped under 12 and fecal coliform was not growth after 30 days. Disposal biosolids from Serkan treatment plant was raw. Lime addition could be stabilized this biosolid and the products could be well used as a landfill cover, or a soil conditioner. Capital and annual cost of activated sludge with lime stabilization biosolids was cheaper than extended aeration activated sludge about 45 and 55%, respectively.
  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.
  A. Mesdaghinia , S. Rezaie , M. Shariat , S. Nasseri , A.H. Mahvi , G.A. Omrani , S. Nazmara , A. Ghasri and M. Alimohammadi
  This research was carried out to isolate and identify degrading microorganisms of MTBE in the soil samples taken from the adjacent ground of lead-free gasoline storage tanks as well as from drainage water of MTBE and gasoline storage tanks. Water and soil samples were prepared and microorganisms were inoculated and then harvested from mineral salt media. After several passages within 200 days, microorganisms capable of using MTBE as carbon and energy source were isolated. Isolated microorganisms inoculated in common culture media including R2A agar and BHI were identified as Pseudomonas putida, Comamonas, Alcaligenes, Bacillus and Micrococcus by specific kit of epi.
  A.H. Mahvi , A.R. Mesdaghinia and D. Naghipoor
  This study aimed to establish an optimized concentration and application of Na2-EDTA in heavy metals removal from contaminated soils. Laboratory experiments were conducted to evaluate the interaction of metals (Cd, Zn and Pb) in soil. Thus, the feasibility of soil washing for the decontaminated silt, clay and loam with single and several metals were evaluated in laboratory-scale batch experiments. Extraction of Cd, Zn and Pb in experimental soils was determined by several different concentrations of extraction solutions. Batch washing of the contaminated soil with deionised water was used as a control. 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 Cd and Zn. However, Na2-EDTA 0.005 M solution indicated higher removal efficiency for Cd and Zn.
  A.H. Mahvi and M.H. Dehghani
  The current available strategies to inhibit growth of algae population include chemical addition, flushing with clean water, selective discharge of nutrient-rich water and decomposition of thermal stratification and biological treatment. However, some of these treatments have shortcomings, foremost of which is the generation of secondary pollutants. For example, chemical treatment (algaecides) may show immediate effect but this process may also indirectly kill or destroy other organisms due to the sudden release of toxic chemical components from the algae. Therefore, alternative methods for the control of algae population in water supplies are required. A novel method that is proposed is the use of ultrasonic irradiation. Ultrasonic irradiation in a liquid medium has been used for many years to lyse biological cells. Ultrasonication may have the potential to reduce their capacity to float and control their buoyancy thereby reducing their concentration near the surface of water bodies and lesson their growth and survival. Ultrasonication may also inhibit or reduce growth of algae population through its affect on metabolic processes. Application of ultrasonic irradiation for removal of algae population was investigated. Experiments demonstrated that frequency and input power are the major factors that affect the ultrasonic irradiation intensity. Short exposure (150 sec) to ultrasonic irradiation (155 W input powers, 42 kHz) effectively settled naturally growing algae suspension. Sedimentation was caused by the disruption and collapse of gas vacuoles after ultrasonic exposure. Moreover, was found to be more effective in decreasing the photosynthetic activity of algae population. This research will provide basic information on the fundamental of ultrasonic irradiation as a novel means for algae population control.
  J. Nouri , M. Jafarinia , K. Naddafi , R. Nabizadeh , A.H. Mahvi and N. Nouri
  Energy recovery in wastewater treatment plant is one of the ways to lowering operation costs. The research was conducted in Tabriz wastewater treatment plant, at the north west of Iran in 2004 which has a design capacity of 1.5 m3s-1 wastewater. The main focus of the research was on methane production potential of domestic wastewater. During this study which lasted 6 month`s energy consumer units of plant were reviewed. Wastewater flow rate (Q), BOD and bCOD of wastewater in three points, plant influent, primary settling effluent and plant effluent, were tested. The potential of methane production were also estimated and converted to electrical energy. The results showed that by optimization of methane production and energy consumption in different units of plant, it is possible to provide 97% of plant electrical energy and all of another form of energy as heat.
  A. Maleki , A.H. Mahvi , M. Alimohamadi and Azar Ghasri
  The photodegradation of phenol was studied in a batch reactor configuration illuminated with a 400 W medium pressure mercury lamp. The effects of parameters such as pH, kinetic constants and initial phenol concentration on the photolytic degradation and toxicity assay have been studied. The experimental results have shown that lower pH and lower concentration of phenol favor the phenol degradation. The disappearance of phenol in each case approximately obeyed first-order kinetics with the apparent first-order decay constant increasing with decreasing solute concentration. Bioassay tests showed that phenol were toxic to D. magna and so resulted in quite low LC50 values. Comparison of Toxicity Units (TU) between phenol and effluent toxicity has shown that TU value for effluent was 2.18 times lower than that obtain to phenol. Thus, photolysis able to eliminate the toxicity of by-products formed during the degradation of phenol.
  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.
 
 
 
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