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Articles by K. Naddafi
Total Records ( 7 ) for K. Naddafi
  F. Mohsenzadeh , K. Naddafi , J. Nouri and A.A. Babaie
  The bag filters are important equipments in cement factory. In these filters current flow that includes gas and dust cross through the pores are located in the stuff filter and filtrate by that remaining on the bag. Afterward, by dust increase on the bag, the filter is shaken until dust collecting leads to exit hopper. This system in this project is called mechanical method. In order to obtain a better operation after introducing to the operation mechanism, the same steps like create good situation for maintain for maintenance and repairs by consideration on important fragment and appoint minority of stock in the stores, carry out the planning of the maintenance and repairs, improvement of stock mandatory. Then, the pressures were measured in various part of filter system and controlled the pressure drop. By inspection of various kinds of bags used in the filter, 550 g m-2 polyester bags showed a better performance and parameter effective in tearing and wearing of bags which were recognized. Also by installing timer on the shaking system, the shaking periods of bags were increased. In order to increase dust cake layer and better performance of deducting and bags life time. Assessment of operation on a sample bag filters show that the ready operation time of filter was increased about 200% and out put of dust amount decreased to the below of the standard limits.
  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 , 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.H.R. Jahed Khaniki , M. Yunesian , K. Naddafi , J. Nouri and M. Ali Mohammadi
  Phthalates are present in almost all plastic equipments. Phthalates are not chemically but only physically bound to the polymer chains, they may be leached into food and beverages from the packaging material. A study was determined DBP and DEHP release into water stored in plastic tumblers at different temperatures and times. Thirty five disposable plastic tumblers with 200 mL volume, which have manufactured for water and beverages, bought from plastic market. Then, deionized water with different degrees (10 and 80°C) was added into disposable plastic tumblers for a period of 10, 20 and 60 min. Extraction was done and all analyses were carried out on a HPLC system with UV detector. Results showed that the maximum of DBP and DEHP contents into water stored in disposable plastic tumblers are 1.5±0.48 and 0.15±0.08 μg L-1, respectively. Stored hot water with 80°C for 60 min had the highest concentrations of DBP in the other groups of water samples. It was showed that released DBP into water samples has increased at high temperatures and longer period. Also, there was a significant difference in DBP contents in stored water with 10°C for 10 min (p<0.023) and DEHP contents in stored water with 80°C for 20 min (p<0.023), while there wasn`t a significant difference in other DBP and DEHP contents in water samples (p>0.05). It was concluded that released DBP and DEHP levels into water samples has increased at high temperatures and longer times. Therefore, it can have been some concerns about the release of DBP and DEHP from plastic tumblers into hot drinks for consumer.
  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.
  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.
  K. Naddafi , M. Zamanzadeh , G. A. Omrani , A. R. Mesdaghinia , A. A. Azimi and E. Mobedi
  Sludge disposal has always represented a substantial portion of the costs associated with sewage treatment. In addition, the skilled personnel are not easily available to assure sound maintenance and operation of the conventional sludge treatment systems such as aerobic and anaerobic digestion; therefore, it is necessary to employ low cost and low technology practices in sludge management. Using earthworms in stabilization of sewage sludge, which has been approved by considerable work, can be a good alterative. This research was conducted to study the effect of stocking densities on sludge stabilization and sludge characteristics. In this regard, 40, 80 and 120 g earthworm wet weight were introduced into each of the plastic bins sizing 36 x 25 x 20 cm (length x width x height) to provide the desired stocking densities of 0.45, 0.90 and 1.35 kg worms m-2. Each bin received 2 kg waste activated sludge. The pilot-scale study showed that the highest VS (24.3%) reduction occurred in a stocking density of 1.35 kg Worm m-2 in which TKN and organic to mineral P ratio reduced 58.3 and 93.5 %, respectively.
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