توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Statistical Optimization of Media Compositions for Anaerobic Decolorization of Reactive Black 5
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
In this work, decolorization of C.I.Reactive Black5 (RB5) was carried out under batch anaerobic condition using activated sludge. The effects of medium composition on RB5 decolourisation efficiency were investigated by employing statistical design of experiments. The Plackett–Burman design was used to determine which medium components had a positive effect on decolorization of this azo reactive dye. Statistical analysis of the results showed that FeCl2.4H2O, MgSO4.7H2O, and MnCl2.4H2O had a positive contribution to azo dye decolorization. A Box–Behken design was performed to obtain the optimum concentration of these three media components with respect to dye decolourisation.<\div>

۲Kinetics of styrene biodegradation by an industrial activated sludge
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
The kinetics of the aerobic biodegradation of styrene using an activated sludge obtained from the wastewater treatment plant of a Petrochemical complex in Iran was evaluated. For this purpose synthetic wastewater samples containing styrene in the concentration range 0–123 mg\l were prepared and biodegradation assays were carried out in serum bottles using shake flask cultivation. The styrene concentration in the liquid phase was monitored via determination of styrene concentration in the gas phase of the serum bottles using headspace method. The dependence of specific degradation rate (SDR) on styrene was determined. It was found that Haldane equation adequately predicted the biodegradation of styrene.<\div>

۳The Effect of Organic Loading Rate on the Performance of Membrane Bioreactor Used for the Treatment of Synthetic Oilfield Wastewater
اطلاعات انتشار: چهاردهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۶
Oil field wastewater or produced water is a significant waste stream in the oil and gas industries. It contains high concentrations of hydrocarbon constituents and different salts. In this study, amembrane bioreactor (MBR) was used to treat synthetic produced water using consortia of isolated halophilic bacteria from oil–contaminated saline soils at SRT 80 day and TDS 64 g L–1.The MBR was evaluated in terms of biodegradation of hydrocarbons in the synthetic producedwater with various organic loading rates (OLR) (0.3, 0.6, 0.9, 1.2, and 1.7 kg COD m–3 day–1) and membrane performance. With increase in OLR from 0.3 to 1.7 kg COD m–3 day–1, COD and O&Gremoval efficiency increased from 84% and 85% to 91% and 98%, respectively. Also there was nomembrane fouling during 173 days of operation of MBR. This high COD and O&G removal efficiency may be mainly credited to the good capability of the isolated halophilic bacterial culture and the retention of dispersed oily material by membrane. Based on the results, the treated water from MBR is suitable for re–injection and discharge to sea.<\div>

۴Biological Treatment of Synthetic and Real Oilfield Produced Water of Varying Salinity Using an Isolated Halophilic Bacterial Consortium
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۱۰
Produced water or oilfield wastewater is the largest volume of a waste stream associated with oil and gas production and is a mixture of different organic and inorganic compounds including a high concentration of salt. The aim of this study was to investigate the treatment of synthetic and real produced water using a consortium of isolated halophilic bacteria from oil–contaminated salinesoil. Also the influence of different NaClconcentrations in the range 10–200 g L–1 on the performance of this consortia of halophilic microorganisms for biodegradation of syntheticproduced water has been investigated. The performance and efficiency of these isolated bacteria has been studied by obtaining the COD and OD (in 254 nm) and total protein concentration data. The results of runs with synthetic produced water with NaCl concetration of 50 g L–1 showed protein concentration of around 127.4 mg L–1 after 5 days of incubation, COD removal of 75% after 15 days of incubation and hydrocarbon removal of 94.5% after 7 days of incubation. The results of runs at different salt concentrations showed that the highest COD removal efficiency (75.2%) and concentration of total protein (122.01 mg L–1) was achieved at a NaCl concentration of 50 g L–1. Experiments with real produced water obtained from Cheshme khosh oilfield showed that despite the high concentration of salt (190 g L–1) in this wastewater, relatively high CODremoval efficiencies (around 87.2%) were obtained after 40 days.extracellular polymeric substances (EPS) and soluble microbial products (SMP) were also measured and a preliminary run was also carried out in a membrane bioreactor (MBR) which indicated that membrane can have a minor role in the removal of pollutants from produced water and also membrane fouling might not be very serious. The findings of the present work indicate that the use the isolated halophilicbacterial consortium in a membrane bioreactor can potentially be a suitable strategy treatment of Iranian oilfield produced waters. for the<\div>

۵Biological Treatment of Vegetable Oil Wastewater in a Submerged Membrane Bioreactor
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۱۱
Vegetable oil wastewaters (VOWs) are generally characterized by offensive smell, dark color, and high organic content, including large amounts of oil and grease (O&G), fatty acids, phenolic chemicals, pectins, and lipids. Therefore, VOWs should be treated efficiency to avoid the environment pollution. The membrane bioreactor (MBR) is an alternative solution for VOWs treatment. In this study the organic pollutant removal performance, membrane fouling and the mixed liquor characteristics of a MBR for the treatment of real VOW was considered. During the 30 days operation of the MBR at hydraulic retention time and solid retention time of 48 h and 20 days respectively, there was a consistently low turbidity (<2 NTU) in the MBR effluent. MBR achieved COD and O&G removal from the wastewater of 85.0±1.3 % and 52.5%±2.6 % respectively. With decrease in MLSS and MLVSS concentration during the MBR operation, aerobic metabolic activity of the activated sludge decreased and COD and O&G accumulation occurred inside the bioreactor. The effluent COD value and the transmembrane pressure during the operation of the MBR remained in the range 88.7±11.5 mg L–1 and 0.1–1.0 kPa, respectively. The results of the present study indicate the very good potential of the MBR, both in terms of removal performance and membrane fouling, for treatment of VOWs.<\div>
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