بررسی پارامترهای فیزیکوشیمیایی تأثیرگذار بر فرآیند SND در حذف ترکیبات نیتروژنی

محورهای موضوعی : آلودگی محیط زیست (آب و فاضلاب)

سید محمدعلی مسعودی ¹ (کارشناسی ارشد مهندسی شیمی، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران *(مسوول مکاتبات).)
جواد سرگلزایی ² (استاد گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران.)
فاطمه ثابتی دهکردی ³ (کارشناسی ارشد مهندسی شیمی، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران.)
ابوالفضل درودی ⁴ (استادیار گروه شیمی، دانشکده ثامن الحجج (ع)، دانشگاه فنی وحرفه‌ای، مشهد، ایران.)

تاریخ دریافت : 1394/12/25 تاریخ پذیرش : 1395/06/21 تاریخ انتشار : 1398/08/01

کلید واژه: اندازه فلاک, نیتروژن, دنیتریفیکاسیون, نیتریفیکاسیون, ‌ دما,

چکیده مقاله :

زمینه و هدف : تصفیه پساب های حاوی ترکیبات نیتروژنی، به دلیل مخاطرات محیط زیستی امری ضروری است. طی دهه های اخیر، فناوری های جدید بیولوژیکی نظیر نیتریفیکاسیون-دنیتریفیکاسیون به طور هم زمان (SND)، آناموکس و شارون توسعه یافتند که نسبت به فرآیندهای مرسوم، ارزان تر و مؤثرترند. هدف از این تحقیق، بررسی خواص فیزیکیوشیمیایی فرآیند SND است. روش بررسی : در این تحقیق، با گردآوری مقالات دو دهه اخیر، پارامترهایتأثیرگذار بر فرآیند SND نظیر دما، pH، اکسیژن محلول، نسبت کربن به نیتروژن، اندازه فلاک و زمان ماند لجن (SRT) مورد بررسی قرار گرفتند. یافته ها : فرآیند SND نیاز به منبع کربنی را کاهش می دهد. به منظور تعادلبیننیتریفیکاسیون ودنیتریفیکاسیون، غلظت اکسیژن محلول باید در حد مناسبی کنترل شود. راندمان فرآیند در pH نسبتاً بازی بیش تر بود. دمای مطلوب برای رشد باکتری های SND، ℃30-20 بوده و راندمان فرآیند به طور خطی با SRT متناسب نبود. بحث و نتیجه گیری : نتایج این تحقیق نشان داد که فرآیندهای جدید بیولوژیکی نظیر SND در حذف نیتروژن با کاهش نیاز به هوادهی و منابع کربنی امیدبخش توصیف شدند. با کنترل شرایط فیزیکیوشیمیایی فرآیند، می توان به راندمان مطلوبی دست یافت.

چکیده انگلیسی:

Background and Objective: Treating wastewaters containing nitrogenous compounds is an essential issue due to environmental hazards. New biological technologies such as simultaneous nitrification-denitrification (SND), ANAMMOX and SHARON were developed in the last decades. Such techniques are economical and more effective compared to conventional methods. The aim of this work was to investigate physico-chemical properties of SND process. Method: In this study, subsequent to constructing a comprehensive survey on papers published in the last two decades, the impacts of effective parameters such as temperature, pH, dissolved oxygen, organic carbon, floc size and sludge retention time (SRT) on SND process were investigated. Findings: SND process reduces carbon source demand. Dissolved oxygen should be adjusted in a particular range to maintain an equilibrium between the nitrification and denitrification.  The process efficiency was higher in the basic pH. The optimum temperature for the growth of SND bacteria were 20-30 ℃. There was no linear correlation between efficiency of process and SRT. Discussion and Conclusion: The results of this research approved that new biological processes for nitrogen removal such as SND were promising owing to reducing the need for aeration and carbon source. By controlling the Physico-chemical conditions in process, good efficiencies can be achieved.  

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