مقايسه کارايي آلوم و پلي آلومينيوم کلرايد جهت حذف آلاينده‎هاي پساب کارخانه کاغذسازي

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چکیده


چکيده

صنعت كاغذسازي يك واحد عملياتي پيچيده و با تاثيرات متقابل فراوان مي‎باشد. پساب‎هاي این صنعت با داشتن آلاينده­ها و تركيبات رنگ‎زاي مختلف، يكي از آلوده‎ترين پساب‎ها مي‎باشند. واحدهاي زيادي از چوب و كاغذ در سراسر جهان، براي تامين نيازهاي روز افزون به محصولات متنوع كاغذ وجود دارند و تخمين‎ها نشان داده است كه مصرف كاغذ به شدت در حال افزايش است. در اين تحقيق، اثر مواد منعقدکننده آلوم و پلي آلومينيوم کلرايد (PACl) براي تصفيه پساب‌ کاغذ‌سازي جهت کاهش پارامترهاي اکسيژن‎خواهي شيميايي (COD)، کدورت و شاخص حجم لجن (SVI) مورد آزمايش و بررسي قرار گرفته است. مقادير بهينه مواد منعقدكننده و pH با استفاده از آزمايش‎هاي جار به دست آمده است. تحت اين شرايط بهينه، mg/l 1000 آلوم، مقدارmg/l 500 PACl و pH اوليه 6 به دست آمد. نتايج اين تحقيق نشان داد که در بين دو منعقدکننده بررسي شده، PACl با ميزان حذف 96 درصد کدورت و 99 درصد COD بهترين نتيجه را داشته است. هم‌چنين حجم لجن توليدي (ml/g 250) به كمك پلي آلومينيوم كلرايد كم‌تر از لجن حاصل به وسيله آلوم بوده است. يافته‎هاي حاصل از اين مطالعه نشان داد که فرآيند انعقاد شيميايي مي‎تواند به عنوان يک تکنولوژي جديد براي تصفيه انواع مختلفي از پساب‎هاي صنعتي هم چون صنايع کاغذسازي مورد استفاده قرار گيرد.


واژگان کلیدی


پساب، كاغذسازي، آلوم، پلي‎آلومينيوم‎كلرايد، کدورت،COD

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