IJE TRANSACTIONS C: Aspects Vol. 29, No. 12 (December 2016) 1650-1658    Article in Press

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M. Moradi, A. A. Zinatizadeh and S. Zinadini
( Received: July 08, 2016 – Accepted: November 11, 2016 )

Abstract    The textile industry is a water intensive industry that produces a large amount of highly colored wastewater that must be properly treated before disposal or reuse. In the present study, to verify the possibility of reusing textile wastewater with nanofilteration (NF), an attempt was made to treatment of synthetic reactive dye aqueous solution by commercial nanofiltration membrane. Experiments were conducted based on a central composite face-centered design and analyzed using response surface methodology. Dye concentration (10-50 mg/l), operating pressure (3–6 bar), and initial pH of the dye solution (3–9) were selected as the operating variables to analyze, optimize and model the process. The results showed that alkaline and acidic condition led to considerable increase in dye rejection and permeation flux that high quality of water could be recovered. This study clearly showed that response surface methodology was one of the suitable methods to optimize the operating conditions and maximize the dye removal. Also, the commercial NF membranes could be efficiently applied in the dye removal process in a one-stage process.


Keywords    Dye removal, textile wastewater, Direct red 16, nanofiltration membrane, RSM


چکیده    صنعت نساجی یک صنعت پرمصرف در آب است که مقدار زیادی فاضلاب شدیدا" رنگی تولید می کند که قبل از دفع یا استفاده مجدد می بایست بطور صحیح تصفیه شود. در مطالعه حاضر، به منظور بررسی امکان استفاده مجدد از فاضلاب نساجی با استفاده از نانوفیلتراسیون، تصفیه محلول رنگی آبکی توسط غشاء نانوفیلتراسیون تجاری انجام شد. طراحی آزمایشات بر اساس طرح مرکزی مرکب انجام و با استفاده از روش پاسخ سطحی تحلیل گردید. غلظت رنگ (10-50 میلی گرم بر لیتر)، فشار عملیاتی (3-5 بار) و pH اولیه محلول رنگی (3-9) بعنوان متغیرهای عملیاتی به منظور تحلیل، مدل سازی و بهینه سازی فرآیند انتخاب شدند. نتایج نشان داد که شرایط اسیدی و قلیایی سبب افزایش در حذف رنگ و شار عبوری گردید. این مطالعه نشان داد که روش پاسخ سطحی یک روش مناسب برای بهینه سازی شرایط راهبری بود. همچنین، غشاء های تجاری نانوفیلتراسیون می تواند بطور کارآمد حذف رنگ در یک فرآیند یک مرحله ای را انجام دهد.


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