efficiency assessment of bag filters for removal of dust and heavy metals from emissions of electric arc furnaces

نویسندگان

نبی ا... منصوری

دانشیار گروه مهندسی محیط زیست، دانشکدۀ محیط زیست و انرژی، واحد علوم و تحقیقات دانشگاه آزاد اسلامی فرهاد نژادکورکی

استادیار گروه محیط زیست، دانشکدۀ منابع طبیعی و کویر شناسی، دانشگاه یزد نرجس السادات موسویان ندوشن

دانشجوی دکتری علوم محیط زیست، یزد

چکیده

industrial processes release a range of gaseous and particulate pollutants containing heavy metals into the air. lack of enough attention to the design, installation, repair and maintenance of gas and dust filtration systems in industries, is one of reasons of increasing the emissions of these pollutants. hereon, the steel making processes is one of emission sources of heavy metals. according to the importance of this issue, in this study, the efficiency of iasco's bag filters in removal of particles and metals emitted from eafs was investigated. a total of 20 samples of emitted particulates from eaf furnaces by systematic method were simultaneously harvested in various melting from before and after the bag filter system and using standard method “epa method 1” and “epa method5” and with tcr-tecora device. the concentration of heavy metals pb, cd, cr and ni in the original and control samples was determined with using varian spectraa 100/200 device and iso 9855 method. the results showed that the concentration of dust in the flue exhaust is lower than the standard rate. also, according to the obtained results, the efficiency average of bag filters in removal of dust from eafs, was 99.58 percent. the results of survey of the bag filter efficiency in the removal of metals in dust form, showed different efficiencies for various metals. thus, in this study the efficiency of the filters in removing metals respectively from highest to lowest was ni, cr, pb and cd with values ​​96.3, 95.9 , 95.4 and 84.6 percent.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

assessment of the efficiency of s.p.g.c refineries using network dea

data envelopment analysis (dea) is a powerful tool for measuring relative efficiency of organizational units referred to as decision making units (dmus). in most cases dmus have network structures with internal linking activities. traditional dea models, however, consider dmus as black boxes with no regard to their linking activities and therefore do not provide decision makers with the reasons...

diagnostic and developmental potentials of dynamic assessment for writing skill

این پایان نامه بدنبال بررسی کاربرد ارزیابی مستمر در یک محیط یادگیری زبان دوم از طریق طرح چهار سوال تحقیق زیر بود: (1) درک توانایی های فراگیران زمانیکه که از طریق برآورد عملکرد مستقل آنها امکان پذیر نباشد اما در طول جلسات ارزیابی مستمر مشخص شوند; (2) امکان تقویت توانایی های فراگیران از طریق ارزیابی مستمر; (3) سودمندی ارزیابی مستمر در هدایت آموزش فردی به سمتی که به منطقه ی تقریبی رشد افراد حساس ا...

15 صفحه اول

Ecological risk assessment of heavy metals from cement factory dust

Background: The release of metals from industrial factories is one of the most important sources of environmental pollution. The present study aimed to determine the concentration of heavy metals like cadmium (Cd), chromium (Cr), manganese (Mn), nickel (Ni), and lead (Pb) in dust around the cement factory. Methods: A total of 22 dust samples were collected from areas around the cement factory...

متن کامل

Efficiency of Washing Techniques for Removal of Heavy Metals from Industrial Sludge

The effluent treatment plant sludge is one of the major sources of contamination with toxic metals. Since the sludge contains heavy metals, it must be pretreated to reduce the contamination. The heavy metals from the sludge can be reduced/ separated by washing it with a suitable leaching solution. In the present study, the efficiencies of three leaching solutions to remove the contaminants from...

متن کامل

Efficiency of Washing Techniques for Removal of Heavy Metals from Industrial Sludge

The effluent treatment plant sludge is one of the major sources of contamination with toxic metals. Since the sludge contains heavy metals, it must be pretreated to reduce the contamination. The heavy metals from the sludge can be reduced/ separated by washing it with a suitable leaching solution. In the present study, the efficiencies of three leaching solutions to remove the contaminants from...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
محیط زیست طبیعی

جلد ۶۸، شماره ۱، صفحات ۱۲۹-۱۳۵

کلمات کلیدی
industrial processes release a range of gaseous and particulate pollutants containing heavy metals into the air. lack of enough attention to the design installation repair and maintenance of gas and dust filtration systems in industries is one of reasons of increasing the emissions of these pollutants. hereon the steel making processes is one of emission sources of heavy metals. according to the importance of this issue in this study the efficiency of iasco's bag filters in removal of particles and metals emitted from eafs was investigated. a total of 20 samples of emitted particulates from eaf furnaces by systematic method were simultaneously harvested in various melting from before and after the bag filter system and using standard method “epa method 1” and “epa method5” and with tcr tecora device. the concentration of heavy metals pb cd cr and ni in the original and control samples was determined with using varian spectraa 100/200 device and iso 9855 method. the results showed that the concentration of dust in the flue exhaust is lower than the standard rate. also according to the obtained results the efficiency average of bag filters in removal of dust from eafs was 99.58 percent. the results of survey of the bag filter efficiency in the removal of metals in dust form showed different efficiencies for various metals. thus in this study the efficiency of the filters in removing metals respectively from highest to lowest was ni cr pb and cd with values ​​96.3 95.9 95.4 and 84.6 percent.

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023