بررسی خاصیت فتوکاتالیستی کانی‌های زئولیت و گارنت در حذف آلاینده‌های آلی فاضلاب صنعتی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد رشته آلودگی محیط زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 استادیار گروه خاکشناسی، دانشکده کشاورزی و منابع طبیعی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

3 استادیار گروه آلودگی‌ محیط زیست، دانشکده کشاورزی و منابع طبیعی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

کمبود آب و بروز مشکلات محیط‌زیستی‌ باعث شده تا تصفیه فاضلاب و بررسی امکان استفاده مجدد آن مورد توجه قرار گیرد. این پژوهش با هدف بررسی اثر فتوکاتالیستی استفاده از زئولیت و گارنت در حذف آلاینده‌های آلی فاضلاب صنعتی در تابستان سال 1395 انجام گرفت. فاضلاب صنعتی از ایستگاه شماره 13 کارخانه فولاد خوزستان تهیه شد. پایلوت با مقیاس 1:150 شرایط هیدرولیکی با ابعاد 10×24×100 سانتی‌متر از جنس فایبرگلاس ساخته شد. 5 حوضچه با ابعاد 10×24×20 سانتی‌متر مجهز به شیر خروجی در پایلوت تعبیه شد و در هر حوضچه مقادیر مختلفی از زئولیت و گارنت با 3 تکرار شامل: G100، 100Z، 50Z50G، 30Z70G، 70Z30G با دانه‌بندی 2/0 میلی‌متر به ارتفاع 5 سانتی‌متر ریخته شد و 5 سانتی‌متر از ارتفاع باقیمانده‌ هر حوضچه فاضلاب ریخته شد و در برابر نور خورشید قرار گرفت. نمونه‌برداری پس از 2، 4 و 6 روز از طریق شیر خروجی انجام و فاضلاب جدید جایگزین آن شد. اندازه‌گیری‌ها شامل مقادیرBOD5، COD ، TSS،TDS ، EC، SS، کدورت، pH و Oil با روش‌های استاندارد بود. تیمارهای به کار برده شده باعث کاهش BOD5، COD، TSS، SS، Oil و کدورت به ترتیب به میزان 1/94، 94/94، 84، 59/90، 84/92 و 26/87 درصد در پساب خروجی شد. همچنین میزان TDS و DO به ترتیب به 9/1 و 2/1 برابر افزایش یافت. نتایج آزمایش‌های مربوط به تیمارها بیانگر عملکرد خوب و کارایی مناسب این سیستم به ویژه در مورد تیمارهای حاوی گارنت بود و توانایی انجام فرایند فتوکاتالیستی برای حذف آلاینده‌های آلی موجود در فاضلاب صنعتی را نشان داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Studying Photo Catalytic Property of Zeolite and Garnet Minerals in Removal of the Organic Pollutant from Industrial Wastewater

نویسندگان [English]

  • Elham Nazari Garavand 1
  • Ebrahim Panahpour 2
  • Farzaneh Fakheri Raouf 3
1 MSc Student of Environmental Pollutions, Collage of Agriculture and Natural Resources, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 Assist. Prof., Department of Soil Science, Collage of Agriculture and Natural Resources, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3 Assist. Prof., Department of Environmental Pollutions, Collage of Agriculture and Natural Resources, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده [English]

Lack of water along with environmental problems have put focus on wastewater treatment and its potential for reuse. This study aimed to study the photo catalytic impact of using zeolite and garnet in purification of the organic pollutant from industrial wastewater. In summer of 2016 samples were taken from the industrial wastewater of  station number 13 in the Khuzestan steel factory. A pilot with the scale of 1:150 (10 × 24 × 100 cm) was built with hydraulic conditions of this station. The pilot was built of fiberglass material and was divided into 5 ponds with the internal dimensions of 10 × 24 × 20 cm, equipped with outlet valve. There was 5 cm of different amounts of zeolite and garnet inside each pond with three replications  including: G100, Z100, G50Z50, G70Z30 and G30Z70. The aggregation was 0.2 mm and the wastewater was shed to the remaining 5 cm of the height in each pond and was laid in the light of the sun. After 2, 4 and 6 days, the wastewater of each pond was evacuated and sampled through the outlet valve and was replaced with new wastewater. Then, the amounts of BOD, COD, TSS, TDS, EC, SS, turbidity, pH and OIL were measured with the standard methods. The results showed that the applied levels caused reduction of BOD, COD, TSS, SS, OIL, and turbidity in the output wastewater respectively to the amount of 94.1, 94.94, 84, 90.59, 92.84, and 87.26 percent. The amount of TDS and DO were increased by 1.9 and 1.2 times respectively. The results of the tests related to the levels represented the good performance and proper efficiency of this system, particularly in the case of levels containing garnet and they showed the ability of doing photo catalytic process for removal of existent organic pollutants from the industrial wastewater.

کلیدواژه‌ها [English]

  • Wastewater Purification
  • Steel Making
  • Photo catalyst
  • Zeolite
  • Garnet
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