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Articles by Ali Akbar Azimi
Total Records ( 2 ) for Ali Akbar Azimi
  Homa Keshavarzi Shirazi , Ayoob Torkian and Ali Akbar Azimi
  Biofiltration of Triethylamine (TEA) vapor from waste gas was evaluated in this study. Experiments were conducted on a 6 L three-stage biofilter containing a mixture of compost and wood chips (40:60 v/v) as the filter medium. Seed inoculum was obtained from municipal activated sludge and an initial acclimation period of three weeks was allowed prior to data acquisition. TEA elimination rate pattern was evaluated by varying loading rates (6-116 g m-3h-1) and hydraulic detention times (40-60 sec) while maintaining operating temperature at 30 ± 1 °C and humidity at 50-55%. Results showed that Organic Loading Rates (OLR) of up to 114.4 g -3h-1 can be handled without any apparent indication of maximum elimination capacity and substrate inhibition. The elimination capacity of this biofilter could reach up to 72 g m-3h-1. When the loading of TEA exceeded this critical value, substrate inhibition occurred and the elimination capacity decreased. However, the requirement of keeping the pressure drop below 1000 Pa m-1 to avoid operational problems warranted lower than maximum capacity operation. The optimal OLR values of 90 ± 14 g m-3h-1 is suggested for Hydraulic Retention Time (HRT) value of 48 sec. Under these conditions, elimination capacity of 71 ± 3 g m-3h-1 and removal efficiency 81 ± 14% were achieved.
  Ali Akbar Azimi , Seyyed Hossein Hashemi , Gholamreza Nabi Bidhendi and Rohollah Mahmoodkhani
  In this study, the effects of aeration ratio on organic materials removal rate in sequencing batch reactors was considered. Eight hours cycles, including 6 h aeration period, were applied. Raw wastewater with COD equal 350 ± 20 mg L-1 was prepared by dried confectionary milk and tap water. SOTE equation in test condition was defined as y=1.24981ln(x) +13.86231. Aeration ratio was described as ratio of supplied dissolved oxygen to required oxygen amount. Taking into account nitrification and denitrification processes, five aeration ratios: 1.1, 3.14, 5.44, 6.97 and 8.83 are applied. Results showed aeration ratios, above stoichiometric required oxygen amount, do not have a significant effect on organic materials removal efficiency and just slope of curve of COD changes via time, changed moderately.
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