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المؤلفBensalah, N.
المؤلفNicola, R.
المؤلفAbdel-Wahab, A.
تاريخ الإتاحة2022-12-12T07:30:36Z
تاريخ النشر2013-10-03
اسم المنشورInternational Journal of Environmental Science and Technology
المعرّفhttp://dx.doi.org/10.1007/s13762-013-0375-0
الاقتباسBensalah, N., Nicola, R., & Abdel-Wahab, A. (2014). Nitrate removal from water using UV-M/S2O4 2− advanced reduction process. International Journal of Environmental Science and Technology, 11(6), 1733-1742.
الرقم المعياري الدولي للكتاب1735-1472
معرّف المصادر الموحدhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84905963246&origin=inward
معرّف المصادر الموحدhttp://hdl.handle.net/10576/37163
الملخصIn this work, a new process called advanced reduction process (ARP) was used for nitrate removal from water. This ARP process combines sodium dithionite as reducing agent with ultraviolet irradiation using medium pressure lamps (UV-M) as an activating method. Experimental results showed that UV-M/S2O42- process achieved almost complete removal of nitrate from aqueous solutions containing 25 mg NO3-/L using stoichiometric dose of dithionite of 68.8 mg/L at neutral pH conditions. Analysis of final products and material balance confirmed that NO3- ions were reduced to ammonium with formation of nitrite as intermediates in addition to the formation of small amounts of volatile species, mainly ammonia and nitrogen gas. Effects of certain experimental parameters including dithionite dose, initial pH, initial nitrate concentration, and UV light source on the kinetics and efficiency of nitrate reduction were evaluated. Increasing dithionite dose augmented the rate of nitrate reduction and enhanced the efficiency of ARP process. Dithionite doses higher than stoichiometric ratios led to complete removal of nitrate in shorter reaction time. UV-M/S2O42- process was found to be effective only under neutral pH or alkaline conditions, and its removal efficiency is negligible in acidic medium (pH < 4). Irradiation with UV-M was more effective than low pressure or narrow band lamps. These results can be attributed to the contribution of several mechanisms for nitrate reduction to ammonium. These include the following: direct photolysis, chemical reduction of nitrate dithionite, and mediated reduction of nitrate by free reducing radicals. © 2013 Islamic Azad University (IAU).
راعي المشروعQatar National Research Fund (QNRF) - No. NPRP 4-1174-2-458.
اللغةen
الناشرSpringer
الموضوعAdvanced reduction processes
Dithionite
Nitrate reduction
Reducing radicals
UV-M irradiation
العنوانNitrate removal from water using UV-M/S2O42- advanced reduction process
النوعArticle
الصفحات1733-1742
رقم العدد6
رقم المجلد11
dc.accessType Open Access


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