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Articles by A.H. Mahvi
Total Records ( 8 ) for A.H. Mahvi
  A.H. Mahvi and M. Razavi
  One of the most important treatment processes in surface water treatment plants is coagulation. Surface waters such as rivers and lakes contain suspended particles and turbidity. With the aid of coagulants, and by flocculation process, followed by sedimentation and filtration, these impurities can be removed from raw waters these days, besides conventional chemicals such as Alum and Ferric chloride, polymers are getting common. Polymers can be used as pretreatment and filter aids chemicals, also. There are some advantages in the usage of polymers, such as; higher sedimentation rate, lower price, better finished water quality, lower sludge volume produced, and a better sludge quality with respect to mineral coagulants. Of course some disadvantages are related to the polymers such as the monomers and residues in finished water which may be a health hazard. In this research, four different polymers for turbidity removal from raw waters were investigated. Raw water with turbidities of 200, 500, 700 and 1000 FTU were treated with optimum polymer dosage. The results showed that, polymers with small dosage can be used for water purification. In this regard it was found that Magnafloc LT27 has lowest dosage an better floc strength with respect to others.
  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.
  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.
  A.H. Mahvi , N. Alavi and A. Maleki
  The adsorption behavior of rice husk and its ash for cadmium ions from aqueous solutions has been investigated as a function of appropriate equilibrium time, amount of adsorbent, concentration of adsorbate, pH and particle size using a batch system. Studies showed that pH of aqueous solutions affected cadmium removal as a result of removal efficiency increased with increasing solution pH. The maximum adsorption was about 97.2 and 99.2% for rice husk and rice husk ash, respectively, at pH 6, contact time 180 min and initial concentration of 20 mg L -1. Desorption of cadmium was 9% at pH 6. The cadmium sorption obeyed both the Langmuir and Fraundlich isotherms. The studies showed rice husk ash was more favorable than rice husk in removing cadmium and thus was a better adsorbent.
  J. Nouri , A.H. Mahvi , A.A. Babaei , G.R. Jahed and E. Ahmadpour
  The objective of this study was to evaluate and map regional patterns of heavy metals (Cu, Cd, Ni and Zn) occurrence in south of Iran. 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, Cu, Zn and Ni concentrations have been shown below the EPA MCLG, EPA secondary standard and EPA MCL, respectively, but Cd, contents of 4.8% of all samples was higher than EPA MCL. The heavy metals concentration is more pronounced in south part than northern part of the studied area. 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.
  M.A. Zazouli , S. Nasseri , A.H. Mahvi , A.R. Mesdaghinia and M. Gholami
  Natural Organic Matters (NOMs) are abundant in natural water resources and in many ways may affect the unit operations in water treatment. Although, NOMs are considered harmless but they have been recognized disinfection by-products precursors (DBPs) during the chlorination process. Formation of DBPs highly depends on the composition and concentration of NOM, which can be broadly divided into two fractions of hydrophobic (humic) and hydrophilic (non-humic) substances. The objective of this study was to determine Natural organic matter and its fractions concentration in the surface water sources of Tehran. Water sampling was conducted monthly between May to July 2006 in three rivers Lar, Jajrood and Karaj as the main drinking water supplying sources in Tehran. Quantitative parameters of pH, EC, UV254 and DOC were studied based on to standard methods. The XAD-7 resin method was used for fractionation of NOM. Results showed that NOM concentrations in Lar, Jajrood and Karaj rivers were 8.53, 12.9 and 11.3 mg L-1, respectively. The HPO (hydrophobic) fraction was predominant compared to the HPI (hydrophilic) fraction in the all of water samples. The mean of total percent of HPO and HPI fractions were about 57 and 43%, respectively. Since the hydrophobic NOM fraction exhibits higher trihalomethane formation potential (THMFP) than hydrophilic NOM, Tehran water chlorination exhibits higher THMFP than haloacetic 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.
  H. Keramati , H. Alidadi , A.R. Parvaresh , H. Movahedian and A.H. Mahvi
  The aim of this research was to sudy the reduction of pollution of vegetable oil manufacturing wastewater with DAF system. At first phase of this examination, the optimum dosage of the coagulants was determined. The coagulants that used in this study were Alum and Ferric Chloride. The second phase was flotation in this series of examinations, oil, COD , total solid, volatile solid, fixed solid and suspended solid measured in raw wastewater and the effluent of the DAF pilot. Optimum value of pH for alum and ferric chloride obtained 7.5 and 5.5, respectively. Optimum dosage for these obtained 30 and 32 mg L-1 in this research. Mean removal for the parameters of oil, COD, total solid, volatile solid, fixed solid and suspended solid obtained 75.85, 78.27, 77.32, 82.47, 73.52 and 85.53%, respectively. With pressure rising from 3 to 4 and 5 atm removing rate of COD, total solid, volatile solid, fixed solid parameters reduced , but oil and suspended solid have increase. In addition, following increase of flotation time up to 120 sec all of the measured parameters have increase in removing rate. Optimum A/S for removal of COD, total solid, volatile solid, fixed solid parameters obtained 0.001 and for oil and suspended solid obtained 0.0015.
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