کارایی فرایند تلفیقی الکتروکواگولاسیون با الکترودهای آهن و ستون فیلتری حاوی پامیس در حذف کروم و سیانید از فاضلاب شهرک صنعتی صفادشت

محورهای موضوعی : آلودگی محیط زیست (آب و فاضلاب)

سید محسن بلادی ¹ , رویا مافی غلامی ² , مهراد مهردادیان ³

1 - کارشناسی ارشد مهندسی عمران محیط زیست، گروه محیط زیست، دانشکده هنر و معماری، دانشگاه آزاد اسلامی واحد تهران غرب.
2 - دانشیار گروه محیط زیست، دانشکده هنر و معماری، دانشگاه آزاد اسلامی واحد تهران غرب. * (مسوول مکاتبات)
3 - کارشناسی ارشد مهندسی عمران محیط زیست، گروه محیط زیست، دانشکده هنر و معماری، دانشگاه آزاد اسلامی واحد تهران غرب.

تاریخ دریافت : 1401/12/08 تاریخ پذیرش : 1402/02/02 تاریخ انتشار : 1402/07/01

کلید واژه: فاضلاب شهرک صنعتی, فیلتراسیون, فرآیند انعقاد الکتریکی, پامیس,

چکیده مقاله :

زمینه و هدف: امروزه حفظ محیط زیست به امری ضروری برای جامعه تلقی می‌شود. تصفیه فاضلاب‌های صنعتی به دلیل مشخصات فیزیکوشیمیایی منحصر بفردی که دارند، نیازمند فرایندهای مختلف از جمله موثر هستند. کیفیت و کمیت فاضلاب صنعتی به دلیل وجود صنایع مختلف، پیچیده تر از فاضلاب انسانی است و به دلیل داشتن بار آلودگی بالا باید قبل از تخلیه به محیط زیست تصفیه گردد. فلزات سنگین یکی از دلایل ایجاد آلودگی‌ در فاضلاب صنعتی، هستند. فرایند انعقاد الکتریکی و فیلتراسیون به عنوان یک فرایند تلفیقی و دوستدار محیط زیست، دارای قابلیت بالایی در تصفیه فاضلاب‌هایی با آلودگی بالا است. روش بررسی: در این مطالعه از فرایند انعقاد الکتریکی در مقیاس آزمایشگاهی به‌منظور حذف فلز کروم (شش ظرفیتی) و سیانید استفاده شد. در این فرایند، تاثیر متغیرهای pH اولیه فاضلاب (9-5)، زمان واکنش) 600- دقیقه(، جریان الکتریکی اعمال شده (3-1آمپر( و ارتفاع بستر فیلتراسیون) 30-10سانتی‌متر) مورد بررسی قرار گرفتند. یافته ها: بر اساس نتایج به دست آمده بهترین شرایط فرایند انعقاد الکتریکی شامل pH برابر7 ، زمان انجام انعقاد الکتریکی برابر 60 دقیقه، جریان الکتریکی اعمال شده بر سطح الکترودها برابر 3 آمپر و ارتفاع پامیس به عنوان ماده فیلتر کننده در داخل ستون برابر 30 سانتی متر است. در این شرایط کارآیی حذف کروم و سیانید به ترتیب 92 و 88 درصد به دست آمد. بدین صورت که در شرایط بهینه تعیین شده، میزان غلظت کروم و سیانید از 13 و 9/08 میلی گرم به ترتیب به 1/56 و 0/72کاهش پیدا کرده است . بحث و نتیجه گیری: بر اساس استانداردهای ارایه شده توسط سازمان حفاظت محیط زیست ایران، پساب تصفیه شده توانایی تخلیه به محیط زیست را دارا است.

چکیده انگلیسی:

Background and Objectives: Nowadays, environmental preservation is considered a necessary matter for society. Industrial wastewater treatment requires various effective processes, due to their unique physicochemical characteristics. The quality and quantity of industrial wastewater are more complicated than human wastewater due to the presence of various industries and must be treated before being discharged into the environment due to their high pollution load. One of the common pollutants in industrial wastewater is heavy metals. The electrocoagulation and filtration process, as an environmentally friendly and integrated process, have a high capability in treating wastewater with high levels of pollution. Material and Methodology: In this study, the electrocoagulation process was used on a laboratory scale to remove chromium (hexavalent) and cyanide metal pollutants. In this process, the effect of various parameters, including the initial pH of the wastewater (5-9), reaction time (0-60 minutes), applied electric current (1-3 Amps), and filtration bed height (10-30 cm) were investigated. Findings: Based on the obtained results, the best conditions for the electrocoagulation process include a pH of 7, a reaction time of 60 minutes, an applied electric current of 3 Amps, and a filter bed height of 30 cm. Under these optimal conditions, the removal efficiency of chromium and cyanide was 92% and 88%, respectively. In this way, in the determined optimal conditions, the concentration of chromium and cyanide decreased from 13 and 0.908 mg/L to 1.56 and 0.72 mg/L, respectively. Discussion and Conclusion: Based on the standards provided by Iran's Environmental Protection Organization, treated wastewater has the ability to be discharged into the environment.

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