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Articles by S. Amiri
Total Records ( 4 ) for S. Amiri
  S. Amiri and B. Moshfegh
  The objective of the study is to analyse the conditions for connection of residential buildings in heat sparse areas to district heating systems in order to increase electricity production in municipal combined heat and power plants. The European electricity market has been assumed to be fully deregulated. The relation between connection of heat sparse areas, increased electricity and heat production as well as electricity prices, fuel prices and emissions rights is investigated. The results of the study show that there is potential to expand the district heating market to areas with lower heat concentrations in the cities of Gavle, Sandviken and Borlange in Sweden, with both economic and environmental benefits. The expansion provides a substantial heat demand of approximately 181 GWh/year, which results in an electricity power production of approximately 43 GWh/year. Since the detached and stand-alone houses in the studied heat sparse areas have been heated either by oil boiler or by direct electricity, connection to district heating also provides a substantial reduction in emissions of CO2. The largest reductions in CO2 emissions are found to be 211 ktonnes/year assuming coal-fired condensing power as marginal electricity production. Connection of heat sparse areas to district heating decrease the system costs and provide a profitability by approximately 22 million EURO/year for the studied municipalities if the price of electricity is at a European level, i.e. 110 EURO/MWh. Sensitivity analysis shows, among other things, that a strong relation exists between the price of electricity and the profitability of connecting heat sparse areas to district heating systems.
  S. Amiri , M. R. Mehrnia , H. Azami , D. Barzegari , M. Shavandi and M. H. Sarrafzadeh
  Presence of heavy metals is considered to be a major challenge in wastewater treatment. In this research the effect of heavy metals such as nickel (Ni), chromium (Cr), and manganese (Mn) on fouling in membrane bioreactors was investigated. Fouling tendency of a cellulose acetate membrane was evaluated in MBRs with different concentrations of the mentioned elements. The concentrations of extractable extracellular polymeric substances in the mixed liquor at the steady-state condition and different concentrations of heavy metals were compared. Also the effects of concentration of heavy metals on mean floc diameter, hydrophobicity, and hence the fouling propensity of membrane was investigated. The Analysis of variance (ANOVA) method has been used to illustrate the important factors for the prediction of the fouling behavior. Results showed that different salts of the same heavy metal ion and various concentrations of heavy metals in wastewater had different effects on sludge properties and hence induced different fouling tendency of sludge.
  M.J. Amiri , A. Ebrahimizadeh , S. Amiri , M. Radi and M. Niakousari
  In this study, the effects of different irrigation methods (furrow, surface drip and subsurface drip) and water qualities (municipal treated effluent and fresh water) with irrigation scheduling based on soil moisture and root depth monitoring were evaluated on the composition and physicochemical quality of the corn flour. A split plot experiment with three main treatments (irrigation methods) and two sub-main treatments (irrigation water qualities) with four replications were designed and executed in Marvdasht sewage station. The magnitude and extent of the factorial influence were measured/conducted using the effects on Water Absorption Capacity (WAC), Swelling Index (SI), solubility (TSS) and Gelatinization Temperature (GT). Based on the results, the corns, irrigated by furrow irrigation method showed higher protein and oil contents than those irrigated by other methods. In each irrigation method, the samples irrigated with effluent, had higher protein content than those irrigated with fresh water. However, the protein content of the grains probably improved with increasing the volume of irrigation water in furrow methods than the other irrigation methods. The sub-surface drip using wastewater can be a good choice from the point view of agriculture (due to its higher water saving and greater yield) and also food industry (because of the high starch content, solubility and swelling index and the least gelatinization point of the corn flours).
  M. Radi , M. Niakousari and S. Amiri
  Low fat (1.6% fat) and non fat yogurts were manufactured from acid treated wheat starch and acid treated cross-linked wheat starch at concentrations of 1.6 and 3.2%. Yogurt samples were manufactured with skim milk (or whole milk for the control and yogurts with 1.6% fat), non fat skim milk powder, yogurt cultures and modified starch. After homogenization, pasteurization and cooling, yogurt mixed were inoculated, poured in to the containers, incubated for approximately 3 h and cooled to 4°C. Titrable acidity, amount of syneresis, texture firmness and sensory scores were determined during storage. Acid treated cross linked starch (1.6%) were more firm than the control, followed by acid treated cross linked starch (3.2%). The yogurts treated with acid treated starch, had a very soft texture which were unacceptable. The full fat yogurts received the highest flavor scores that was followed by acid treated cross linked starch yogurts at 1.6 and 3.2% starch concentration, respectively. Addition of modified starch decreased the water release of the yogurts significantly. As the concentration of starch increased, the syneresis decreased. Good quality non fat and low fat yogurts can be produced by supplementing acid treated cross linked starch. The added starch assists in providing a firm body and minimal whey separation without the use of any other stabilizer.
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