بهینه سازی فرآیند انعقاد جهت حذف COD و رنگ از فاضلاب واحد رنگرزی یک کارخانه فرش ماشینی و ارزیابی تجزیه پذیری بیولوژیکی پساب حاصل

مریم امینی, احمدرضا یزدانبخش, اکبر اسلامی, احسان آقایانی

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چکیده

زمينه و اهداف: صنعت نساجي يکي از بزرگترين مصرف کنندگان آب در جهان است که فاضلاب آن با مقادير زياد رنگ، اکسيژن مورد نياز شيميايي بالا، pH با نوسان زياد و درجه حرارت بالا شناخته شده است. در ميان روش‌هاي تصفيه فاضلاب صنايع نساجي، فرايند انعقاد به دليل راهبري ساده و اثربخش و همچنين هزينه سرمايه‌گذاري نسبتاً پايين به طور گسترده‌اي مورد استفاده قرار مي‌گيرد.

مواد و روشها: مطالعه در ﻣﻘﻴﺎس آزﻣﺎﻳﺸﮕﺎﻫﻲ بر روي نمونه واقعي و ﺑﺎ اﺳﺘﻔﺎده از سه ﻣﻨﻌﻘﺪ ﮐﻨﻨﺪه ﻣﻌﺪﻧﻲ ﭘﻠﻲ آﻟﻮﻣﻴﻨﻴﻢ ﮐﻠﺮاﻳﺪ، ﺳﻮﻟﻔﺎت ﻓﺮيک و ﮐﻠﺮورﻓﺮﻳﮏ با استفاده از دستگاه جارتست انجام شد. به منظور بهينه‌سازي فرآيند، متغيرهاي pH، غلظت ماده منعفد کننده، زمان و سرعت انعقاد در حذف رنگ و COD مورد بررسي قرار گرفت. تعيين  نسبت BOD5/ COD  به عنوان شاخص تجزيه پذيري استفاده شد.

يافتهها: در شرايط بهينه فرآيند (pH برابر با 9، دوز 250 ميلي‌گرم بر ليتر و سرعت انعقاد 175 دور در دقيقه با زمان 5 دقيقه)، بيشترين مقادير راندمان حذف رنگ و اکسيژن مورد نياز شيميايي با کاربرد پلي آلومينيوم کلرايد به ترتيب 95 و 77/4 درصد حاصل شد. کاربرد منعقد کننده پلي آلومينيوم کلرايد در شرايط بهينه ميزان تجزيه پذيري فاضلاب را از 0/07 به 0/21 افزايش داد. 

نتيجهگيري: اﮔﺮﭼﻪ ﻓﺮآﻳﻨﺪ اﻧﻌﻘﺎد، درﺻﺪ ﺑﺎﻻﻳﻰ از ﺑﺎر آﻟﻮدﮔﻰ ﻣﻮﺟﻮد در ﻓﺎﺿﻼب را ﻛﺎﻫﺶ ودرصد تجزيه پذيري را افزايش ﻣﻰ‌دﻫﺪ، اﻣﺎ تصفيه بيشتر پساب براي تخليه به محيط زيست ضروري  مي‌باشد.

کليد واژهها: فاضلاب نساجي، رنگ زا، انعقاد، تجزيه‌پذيري بيولوژيکي

تمام متن:

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