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Archives of Hygiene Sciences، جلد ۶، شماره ۲، صفحات ۱۱۱-۱۲۰
عنوان فارسی
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عنوان انگلیسی Efficiency of Powdery Activated carbon in Ammonia-Nitrogen Removal from Aqueous Environments (Response Surface Methodology)
چکیده انگلیسی مقاله Background & Aims of the Study: Nitrogenous compounds could directly create many problems for human's health and the environment. Thus, removal of nitrogenous compounds is necessary. Among the most important problems, decreasing dissolved oxygen, toxicity for aquatics, eutrophication, converting aerobic medium into anaerobic one and corrosion could be noted. The aim of this study was determination of powdered activated carbon absorption efficiency in ammonia-nitrogen removal from aqueous environments. Materials & Methods: This study was conducted as an experimental laboratory scale. In discontinuous system, the effect of parameters including absorbent dose (0.5-1.5 gr), initial N- ammonia concentration (100-200 mg/l), pH (3-9) and contact time (2-120 min) on system efficiency evaluated through Response Surface Methodology (RSM). The results were fitted into Freundlich and Langmuir absorption isotherm and then absorption by the activated carbon absorbent compared by these models and absorption were analyzed. Also, first order, semi-second order and particulate infiltration reaction kinetics were evaluated. Results: N- ammonia removal efficiency had a direct relationship with absorbent dose, pH, contact time and reverse relation with initial N-ammonia concentration. Study the isotherms and kinetics process showed that activated carbon followed Freundlich isotherm as well as semi-second order kinetics. Results from central composition design (CCD) model showed that the studied system efficiency fitted to linear equation and results from model predictions had a great agreement with experimental data (R2=0. 98). Conclusion: according to appropriate removal efficiency, powdered activated carbon could be utilized as an efficient and inexpensive absorbent for ammonium absorbance. Decreasing the system efficiency by increasing pollutant concentration must be considered.
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نویسندگان مقاله حاتم گودینی | hatam godini
department of environmental health engineering, health school, alborz university of medical sciences, karaj, iran.


عبدالله درگاهی | abdollah dargahi
department of environmental health engineering, health school, hamadan university of medical sciences, hamadan, iran.

سازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (Hamadan university of medical sciences)

میترا محمدی | mitra mohammadi
department of environmental health engineering, health school, kermanshah university of medical sciences, kermanshah, iran.

سازمان اصلی تایید شده: دانشگاه علوم پزشکی کرمانشاه (Kermanshah university of medical sciences)

قدرت اله شمس خرم آبادی | ghodratollah shams khorramabadi
department of environmental health engineering, health school, lorestan university of medical sciences, khorramabad, iran.

سازمان اصلی تایید شده: دانشگاه علوم پزشکی لرستان (Lorestan university of medical sciences)

علی عزیزی | ali azizi
department of community medicine, medical school, kermanshah university of medical science, kermanshah, iran.


لیلا تابنده | leila tabande
department of environmental health engineering, health school, kermanshah university of medical sciences, kermanshah, iran.

سازمان اصلی تایید شده: دانشگاه علوم پزشکی کرمانشاه (Kermanshah university of medical sciences)

زهرا جلیلیان | zahra jalilian
department of environmental health engineering, health school, lorestan university of medical sciences, khorramabad, iran.

سازمان اصلی تایید شده: دانشگاه علوم پزشکی لرستان (Lorestan university of medical sciences)

نشانی اینترنتی http://jhygiene.muq.ac.ir/browse.php?a_code=A-10-38-5&slc_lang=en&sid=en
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زبان مقاله منتشر شده en
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