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Articles by A.R. Mesdaghinia
Total Records ( 8 ) for A.R. Mesdaghinia
  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.
  M. Farrokhi and A.R. Mesdaghinia
  Monochlorophenols, particularly 3-monochlorophenol are resistant to biodegradation than many poly- chlorinated compound. The presence of chlorophenols in water has become a significant pollution problem. The biodegradation of 3-monochlorophenol was investigated by Anaerobic Baffled Reactor (ABR). A mixture of 3-MCP and glucose as synthetic wastewater was treated in a laboratory scale. The ABR reactor volume was 9 L and wastewater with different concentration of 3-MCP and hydraulic retention time of 2 days, was treated. The parameters that determined include COD, volatile suspended solids (VSS) and 3-MCP concentration. The initial sludge for reactor feeding was isolated from full scale ABR that was operated in an industrial complex. When the concentration of 3-MCP was 10 mg L–1 and less, 3-MCP was able to be metabolized to mineral end products and the COD removal was about 90% and more. With increasing of 3-MCP concentration from 10 to 30 mg L–1, the degradation of 3-MCP and COD removal were decreased significantly (p< 0.001). The variations of VSS in different concentration of 3-MCP was significant (p< 0.001). Increasing of COD to 2000 mg L–1, improved the reactor performance and reduced the toxicity of 3-MCP. In the toxicity evaluation of 3-MCP on ABR biomass, the ratio of glucose/3-MCP is more important parameter than 3-MCP concentration.
  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.
  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.
  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 , 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.
  Amir Hossein Mahvi , Yousef Rahimi and A.R. Mesdaghinia
  This research contains assessment and analysis of the operation data for 30 months, analysis of 540 checklists results to determine design parameters, redesigning the WWTP to determines the problem agents and upgrading requirements, designing the various processes for upgrading and evaluating them by molt-criteria decision and selecting the most proper alternative. The results show that the main true design parameters such as BOD5 and TSS are 50 and 57 g/capita-day, respectively. The water consumption and wastewater production per capita per were 220 and 187, respectively. Using these Design criteria to come up with the best alternative for upgrading of wastewater treatment plant a number of remarks such as: ease of O and M, low operational costs, low maintenance costs, low capital costs short implementation period, potential to remove N and P, reliability of performance, innovation, pollution prevention, maximum use of facilities, long useful life and minimal plant disruptions were considered. All of the alternatives were evaluated by multi-criteria decision method. The score earned by various alternatives are: Use of rock filter in maturation pond effluent (-59), Use of micro strainers for filtration the effluent (-38), Dual powered aerated logoon (-65), Activated Sludge with digest and store excess sludge countercurrent with part of influent wastewater about 8500 m3 day-1 in available lagoons (196), Commutation of No. 1 lagoon to aeration tank and built the sedimentation tanks, invert it to extended aeration tank and use the No. 2 and 3 lagoons for sludge storing (241), Biolac Process (201), Facultative aerated lagoon in 3 modules (-107). At last the alternative with highest score was selected.
  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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