نتایج جستجو برای: chemical waste

تعداد نتایج: 452668  

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
m. nasrollahi dept. of microbiology, school of medicine, mazandaran university of medical sciences, sari, iran. ma. zazouli dept. of environmental health, school of health, health sciences research center, mazandaran university of medical sciences, sari, iran. d. balarak dept. of environmental health, school of health, health promotion research center, zahedan university of medical sciences, zahedan, iran m. moradi golrokhi dept. of microbiology, students research committee, mazandaran university of medical sciences, sari, iran.

objective: dental solid wastes often contain hazardous substances. the first step of management of dental solid wastes includes detection and classification of these substances. this study aimed to qualitatively and quantitatively assess the management of solid wastes by dental offices in urmia city in 2013. methods: this descriptive study was conducted on all private dental offices in urmia ci...

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پایان نامه :دانشگاه بین المللی امام خمینی (ره) - قزوین - دانشکده علوم پایه 1391
محمد عسگرزاده, حسین ایمانیه, میر محمد علوی نیکجه, مسلم حق شناس,

پلی کربنات یکی از پلاستیکهای مهمی است که به صورت گسترده در تولید لوحهای فشرده، قطعات رایانه، مواد ساختمانی و غیره مورد استفاده قرار می گیرد. این پلیمر بصورت عمده از تراکم مونومر بیس فنولa (bpa) و کربنیل کلرید یا دی متیل کربنات ها بدست می آید. در سالهای اخیر بازیافت شیمیایی پلی کربنات بیشتر مورد توجه بوده است. بازیافت شیمیایی پلی کربنات برای بدست آوردن مواد اولیه آن با روشهای متفاوتی مانند تجزی...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391
مینا روشن دل هرمزی, محمود میری,

one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...

Journal: :iranian journal of public health 0
p. samar k. imandel f. mesghali z. javadi g. samar

the purpose of this study was comparison of applicability of tertiary treatment of tehran domestic sewage with organic and inorganic coagulants or a combination of them. the far test procedure was applied utilizing: alum, polyelectrolyte wt 2600, anionic polyelectorlyte wt 3000, and nonionic polyelctrolyte wt 2690 as organic coagulants (products of calgon). the combination of lime with each of ...

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Journal: :تحقیقات نظام سلامت 0
منیره مجلسی دانشیار، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهید بهشتی، تهران، ایران عبدالعظیم علی نژاد دانشجوی دکتری، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهید بهشتی، تهران، ایران منصور برافراشته پور دانشجوی کارشناسی ارشد، گروه مهندسی بهداشت محیط، کمیته تحقیقات دانشجویی، دانشکده بهداشت، دانشگاه علوم پزشکی مازندران، مازندران، ایران حامد محمدی دانشجوی دکتری، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی اصفهان، تهران، ایران

background : due to the crucial role of dental solid waste in the spreading of pathogens and threats to human health and the environment, its optimal management is very important. methods: this was a descriptive cross-sectional study. the study population consisted of 40 dental centers, from among which 11 dental centers were selected through random sampling. from each center, 3 samples were co...

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Journal: :journal of chemical and petroleum engineering 2013
hamid ghanbari- tuedeshki hamid reza hafizi-atabak mojtaba shariaty-niassar javad safaei-ghomi mahdi akbari

cellulose wastes of a wood and paper factory were used to produce activated carbon. several chemical agents under various conditions were used for production of activated carbon and hence their adsorption properties have been evaluated. in addition the effect of process parameters such as raw material, chemical agent concentration, impregnation ratio, carbonization temperature, carbonization ti...

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Journal: :international journal of human capital in urban management 0
m. ranjbar department of soil science, shahrood university of technology, shahrood, iran gh. sadeghnejadtalouki department of soil science, sari agricultural sciences and natural resources university, sari, iran m. ghajar sepanlou department of soil science, sari agricultural sciences and natural resources university, sari, iran f. sadegh zadeh department of soil science, sari agricultural sciences and natural resources university, sari, iran

an experiment was conducted as randomized complete block design with three replications and 14 fertilizer treatments in year 2014. the treatments were including the control, application of chemical fertilizers according the soil analysis, application of 15, 30 and 45 tons of municipal  waste compost per ha as simple and with 25, 50 and 75% of chemical fertilizers. the results revealed that the ...

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Journal: :تولید گیاهان زراعی 0

in order to study the influence of municipal waste compost and chemical fertilizer on yield and yield components in maize (zea mays l.) an experiment was conducted at research farm of sari agricultural sciences and natural resources university during 2007. the experiment was arranged in split plots based on complete randomized block design with two factors and three replications. main plot incl...

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2017
A I Amouei Z Yousefi T Khosravi

BACKGROUND The aim of this study was to determine the potential of produced compost from the sludge of wastewater treatment plant using earthworms and compare it with the vermicompost produced from household solid waste. METHODS In the current study, three treatments with the same conditions in terms of organic wastes type were prepared to produce vermicompost from household solid waste and s...

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Journal: :سلامت و محیط زیست 0
علی کولیوند a kulivand 1department environmental health engineering, school of public health, tehran university of medicalدانشکده بهداشت و انستیتو تحقیقات بهداشتی دانشگاه علوم پزشکی تهران، گروه مهندسی بهداشت محیط دانشجوی رامین نبی زاده r nabizadeh 1department environmental health engineering, school of public health, tehran university of medicalدانشیار و عضو هیئت علمی گروه مهندسی بهداشت محیط دانشکده بهداشت و انستیتو تحقیقات بهداشتی، دانشگاه احمد جنیدی جعفری a joneidy 1department environmental health engineering, school of public health, tehran university of medicalدانشیار و عضو هیئت علمی گروه مهندسی بهداشت محیط دانشکده بهداشت، دانشگاه علوم پزشکی ایران مسعود یونسیان m yunesian 1department environmental health engineering, school of public health, tehran university of medical- دانشیار و عضو هیئت علمی گروه مهندسی بهداشت محیط دانشکده بهداشت و انستیتو تحقیقات بهداشتی، دانشگا قاسمعلی عمرانی gh omrany 1department environmental health engineering, school of public health, tehran university of medicalاستاد و عضو هیئت علمی گروه مهندسی بهداشت محیط دانشکده بهداشت و انستیتو تحقیقات بهداشتی، دانشگاه علو

backgrounds and objectives:today, one of the most important environmental issues is solid waste produced in dentistry that because of the presence of hazardous, toxic and pathogen agents has special importance. in this survey, solid waste produced in hamadan dentistry laboratories and practical dentist offices is studied.materials and methods: in this descriptive study, from 24 dentistry labora...

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