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بررسی آلودگیهای زیست محیطی ناشی از صنایع گاز و پتروشیمی و اثرات
دانلود پروژه:بررسی آلودگیهای زیست محیطی ناشی از صنایع گاز و پتروشیمی و اثرات آن بر سالمت
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بررسی آلودگیهای زیست محیطی ناشی از صنایع گاز و پتروشیمی و اثرات
آن بر سالامت
چکیده
امروزه آلودگی محیط زیست به عنوان یکی از مهم ترین چالش های ملی و بین المللی محسوب می شود، خصوصا در مورد صنایع شیمیایی و پتروشیمی که می تواند مقادیر زیادی از آلاینده ها را وارد اکوسیستم زنده نماید. یکی از این آلاینده های زیست محیطی نیتروژن آمونیاکی می باشد که میزان آن در پساب صنایع پتروشیمی خصوصا واحدهای تولید کنندهی آمونیاک و اوره بالا می باشد. از میان روش های حذف نیتروژن آمونیاکی، روش های بیولوژیکی به عنوان روش های اقتصادی و سازگار با محیط زیست محسوب می شوند. در این مطالعه از روش بیولوژیکی با استفاده از فرآیندهای نیتریفیکاسیون و دنیتریفیکاسیون و با استفاده از کنسرسیوم باکتری های بومی جداسازی شده از صنعت پتروشیمی استفاده شده است. باکتری های جداسازی شده بر روی کربن فعال گرانولی تثبیت و در دو راکتور استفاده شده است. در راکتور نیتریفیکاسیون ، ابتدا آمونیاک به نیترات تبدیل شده و در راکتور دنیتریفیکاسیون نیترات به گاز نیتروژن تبدیل و حذف می گردد.
این تحقیق در دمای 3±28 درجهی سانتیگراد (دمای محیط آزاد)، pH 8 و زمان ماند 3-1 ساعت، در 2 رآکتور بستر شناور که در آن باکتری های بومی نیتریفایر و دنیتریفایر بر روی کربن فعال گرانولی تثبیت شده اند انجام شده است. بارگذاری آمونیاک و نیترات به مقدار 50، 100، 150 و 200 mg/l استفاده شده که ماکزیمم سرعت نیتریفیکاسیون و دنیتریفیکاسیون به ترتیب 2.69 (kgNH4+-N/m3.d)و 2.49(kgNO3-N/m3.d) بدست آمده است. راندمان هر دو فرآیند بالاتر از 90% بدست آمده است.
واژه های کلیدی: نیتروژن آمونیاکی، باکتری های بومی، نیتریفیکاسیون، دنیتریفیکاسیون، رآکتور بستر شناور..
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