حذف نیکل از پساب‌های صنعتی با استفاده از روش الکتروکواگولاسیون

کریمی دوانی, زهرا; مشتاقی, محسن

doi:10.48301/kssa.2022.353077.2219

حذف نیکل از پساب‌های صنعتی با استفاده از روش الکتروکواگولاسیون

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان

¹ عضو هیأت علمی، گروه مهندسی شیمی، نفت و گاز، دانشگاه فنی و حرفه‌ای، تهران، ایران.

² دانش‌آموخته کارشناسی ارشد، گروه مهندسی شیمی، نفت و گاز، دانشگاه فنی و حرفه‌ای، تهران، ایران.

10.48301/kssa.2022.353077.2219

چکیده

فرایند انعقاد الکتروکواگولاسیون از لحاظ اقتصادی و زیستمحیطی، انتخابی مناسب برای سیستمهای تصفیه آب و پساب است. در این مطالعه از یک واحد الکتروکواگولاسیون در مقیاس آزمایشگاهی به حجم تقریبی 2/1 لیتر، مجهز به الکترودهایی از جنس آهن و آلومینیوم به ابعاد 1 50 120 میلیمتر به‌منظور حذف نیکل استفاده شد. تأثیر جنس و فاصله الکترودها، غلظت اولیه، ولتاژ جریان، و pH محیط بر راندمان حذف نیکل و همچنین سینتیک واکنش بررسی شد. مقادیر مصرف انرژی و الکترود نیز برای جفت الکترودهای مذکور در شدت جریانهای مختلف به‌دست آمد. نتایج کار نشان داد که با استفاده از چینشهای مختلف الکترودهای آهن و آلومینیوم، راندمان حذف نیکل بین 7/93 تا 1/98 درصد توسط فرایند الکتروکواگولاسیون در ولتاژ جریان 20 ولت و زمان تماس 60 دقیقه بهدست میآید. راندمان حذف 7/93 درصد برای الکترود Fe(+)/Al(-) با فاصله cm 1 پس از 60 دقیقه در 20ولت، 7 pH و غلظت اولیه mg/l 250 حاصل شد. نتایج این مطالعه حاکی از آن است که راندمان حذف با افزایش ولتاژ، pH و غلظت اولیه افزایش مییابد. با افزایش شدت جریان نیز میزان انرژی مصرفی افزایش یافت و برای جفت الکترودهای آهنی کمتر از سایر حالات بهدست آمد. میزان الکترود مصرفی در این بازه جریان برای آندهای آهن و آلومینیوم به‌ترتیب kg/m³ 31/1 – 87/0 و kg/m³ 45/0 – 28/0 بهدست آمد. همچنین پس از بررسی سینتیک واکنش نشان داده شد که مدل واکنش درجه اول تطابق خوبی با دادههای تجربی دارد.

کلیدواژه‌ها

20.1001.1.23829796.1401.19.3.25.5

موضوعات

مهندسی شیمی

عنوان مقاله [English]

Nickel Removal from Industrial Wastewater Using Electrocoagulation Process

نویسندگان [English]

Zahra Karimidavani ¹
Mohsen Moshtaghi ²

¹ Faculty Member, Department of Chemical, Petroleum and Gas Engineering. Technical and Vocational University (TVU), Tehran, Iran.

² M.S. Graduate, Department of Chemical, Petroleum and Gas Engineering. Technical and Vocational University (TVU), Tehran, Iran.

چکیده [English]

Electrocoagulation (EC) process is an economical and environmental option for water and wastewater treatment systems. In the present study, a laboratory-scale electrocoagulation unit with a volume of 1.2 liters, equipped with iron and aluminum electrodes with dimensions of 1×50×120 mm, was used to remove nickel. Influence of the electrode type and distance, initial concentration, voltage, and pH on the nickel removal efficiency were studied in addition to reaction kinetics. Energy and electrode consumptions of these mentioned arrangements were obtained for different current intensities. The results demonstrated that the Ni removal efficiency changed from 93.7% to 98.1% by electrocoagulation using different arrangements of iron and aluminum electrodes at 20 V and 60 min. EC with an Fe(+)/Al(-) electrode pair after 60 min was able to achieve a 93.7% removal efficiency at 20 V, pH 7, and 250 mg/l initial concentration. The present study demonstrated that nickel removal increased with increasing voltage, pH and initial concentration. The increase in current intensity led to an increase in the energy consumption, which was obtained less for the pair of iron electrodes than other arrangements. Corresponding electrode consumptions of iron and aluminum anodes were determined as 0.87-1.31 and 0.28-0.45 kg/m3, respectively. In addition, the first-order model demonstrated an acceptable agreement with the experimental data.

کلیدواژه‌ها [English]

Heavy meta
Wastewater
Removal efficiency
Nickel
Electrocoagulation

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