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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Analysis,Air pollution,Standards,Particulate Matter
- چکیده:
- چکیده انگلیسی: In the present study, carbon species including organic carbon (OC), elemental carbon (EC), and water-soluble organic carbon (WSOC) concentration in PM2.5 were assessed at an urban site of Tehran, Iran during March to June 2014. The PM2.5 samples were collected using an frmOMNITM Ambient Air Sampler. Thermal gravimetric analysis (TGA) was used to analyze OC and EC. The results showed that PM2.5 concentrations varied from 14.32 to 74.45 µg/m3 with an average value of 41.39 µg/m3. The results also showed that carbon species varied from 5.52 to 23.21 (15.35 ± 6.05) µg/m3 for OC and 1.03 to 4.16 (2.25 ± 0.65) µg/m3 for EC. As the findings indicated, the mean PM2.5 level in the sampling area was higher than the annual average determined by the United States Environmental Protection Agency (EPA) as the ambient air quality standard. On average, carbon species (OC, EC, and WSOC) account for almost 60% of PM2.5 mass in the atmospheric outflow from a downwind site. OC and EC concentrations in atmospheric PM2.5 collected at the sampling site were lower than the values reported for other urban areas with high or medium vehicular traffic and/or industrial sources. Moreover, the results obtained in this research can provide a valuable data base for health risk evaluation of the local residents and prioritization of control actions.
- انتشار مقاله: 24-11-1394
- نویسندگان: Hossein Arfaeinia,Seyed Enayat Hashemi,Ali Asghar Alamolhoda,Majid Kermani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Analysis,Air pollution,Standards,Particulate Matter
- چکیده:
- چکیده انگلیسی: In the present study, carbon species including organic carbon (OC), elemental carbon (EC), and water-soluble organic carbon (WSOC) concentration in PM2.5 were assessed at an urban site of Tehran, Iran during March to June 2014. The PM2.5 samples were collected using an frmOMNITM Ambient Air Sampler. Thermal gravimetric analysis (TGA) was used to analyze OC and EC. The results showed that PM2.5 concentrations varied from 14.32 to 74.45 µg/m3 with an average value of 41.39 µg/m3. The results also showed that carbon species varied from 5.52 to 23.21 (15.35 ± 6.05) µg/m3 for OC and 1.03 to 4.16 (2.25 ± 0.65) µg/m3 for EC. As the findings indicated, the mean PM2.5 level in the sampling area was higher than the annual average determined by the United States Environmental Protection Agency (EPA) as the ambient air quality standard. On average, carbon species (OC, EC, and WSOC) account for almost 60% of PM2.5 mass in the atmospheric outflow from a downwind site. OC and EC concentrations in atmospheric PM2.5 collected at the sampling site were lower than the values reported for other urban areas with high or medium vehicular traffic and/or industrial sources. Moreover, the results obtained in this research can provide a valuable data base for health risk evaluation of the local residents and prioritization of control actions.
- انتشار مقاله: 24-11-1394
- نویسندگان: Hossein Arfaeinia,Seyed Enayat Hashemi,Ali Asghar Alamolhoda,Majid Kermani
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Biotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: MBBR,Biofilm carriers,Biological nutrient removal (BNR),Sewage Treatment,Stover-Kincannon model
- چکیده:
- چکیده انگلیسی: In this research, an experimental study to evaluate nutrient removal from synthetic wastewater by a lab-scale moving bed biofilm process was investigated. Also, kinetic analysis of the process with regard to phosphorus and nitrogen removal was studied with different mathematical models. For nutrient removal, the moving bed biofilm process was applied in series with anaerobic, anoxic and aerobic units in four separate reactors that were operated continuously at different loading rates of phosphorus and nitrogen and different hydraulic retention times. Under optimum conditions, almost complete nitrification with an average ammonium removal efficiency of 99.72% occurred in the aerobic reactor. In the aerobic reactor, the average specific nitrification rate was 1.92 g NOx-N (NOx-N=NO2-N +NO3-N) produced/kg volatile suspended solids. hour (VSS.h). Denitrification rate increased with increasing NOx-N loading in the second anoxic reactor. The aerobic phosphate removal rate showed good correlation with the anaerobic phosphate release rate. Under optimum conditions, the average total nitrogen and phosphorus removal efficiencies were 80.9% and 95.8%, respectively. As a result of the moving bed biofilm process (MBBR) kinetic analysis, the Stover-Kincannon model was chosen for modeling studies and experimental data analysis. The Stover-Kincannon model gave high correlation coefficients for phosphorus and nitrogen removal, which were 0.9862 and 0.986, respectively. Therefore, this model could be used in predicting the behavior or design of the moving bed biofilm process.
- انتشار مقاله: 01-02-1394
- نویسندگان: Majid Kermani,Bijan Bina,Hossein Movahedian,Mohammad Mehdi Amin,Mahnaz Nikaeen
- مشاهده
- جایگاه : پژوهشی
- مجله: Biofuel Research Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,Energy Consumption,Fossil Energy,Price subsidy,Outdoor air pollution,QUAIDS
- چکیده:
- چکیده انگلیسی: Cheap fossil energy leads to overconsumption of energy and hazardous levels of air pollution. In this study, we provide a framework to connect fossil energy price policy to private consumption of energy and outdoor air pollution. We used a consumer demand system and reassessed it for the recent status of the Iranian economy. We extracted household consumption information from Iran’s 2011 and 2014−2016 annual household surveys (n=154683), prices from the Central Bank of Iran’s detailed monthly price indices from 2008 to 2016, and air pollution information from Iran’s Energy Balance Sheets. We estimated that an average Iranian household would reduce its energy consumption by 2%, 16%, 29%, 38%, and 45% if energy prices were hiked by 10%, 50%, 100%, 150%, and 200%, respectively. The corresponding reductions in total outdoor air pollution in the post-hike period would be 2.6, 26.3, 47.6, 62.9, and 74.5 million tons, respectively. Besides highlighting the importance of fossil energy price policy as a short-term strategy to reduce air pollution, this study calls attention to shifting the existing subsidies on fossil fuels to sustainable sources of energy such as waste-oriented biofuels as a -long-term solution.
- انتشار مقاله: 16-03-1399
- نویسندگان: Seyed Reza Khatibi,Seyed M. Karimi,Maziar Moradi-Lakeh,Majid Kermani,Seyed Abbas Motevalian
- مشاهده