تعیین pH و زمان بهینه برای تصفیه پساب صنعت نساجی با استفاده از روش ازن زنی

نوع مقاله : علمی - پژوهشی

نویسندگان

پژوهشکده علوم محیطی، دانشگاه شهیدبهشتی، تهران

چکیده

پساب صنعت نساجی یکی از آلودهترین پسابهای صنعتی است. تاکنون روش های مختلفی برای تصفیه این نوع پساب به کار رفته است. در این میان ازن به دلیل اکسیدکنندگی قو ی و حمله به باندها ی دوگانه مولکول های رنگ می تواند برای تصفیه این نوع پساب به کار رود. هدف از این پژوهش تعیین pH و زمان بهینه برای حذف آلاینده های پساب صنعت نساجی است. در این تحقیق آزمایشات  داخل یک راکتور 2/4 لیتری با mg 341/ 1393 ازن ورودی انجام گرفت. کارایی حذف رنگ و COD 1 با استفاده از روش ازن زنی در pH 5 و 9 و زمان ها ی مختلف بررسی شد. نتایج نشان داد که بهترین کارایی روش ازن زنی در 9= pH و زمان 99 دقیقه است. تحت شرایط بهینه میزان حذف COD 6/21 درصد و میزان کاهش رنگ به ترتیب برابر بود با 56/22 ،63/33 و 36/99 درصد. از آنجاکه قدرت معدنی کردن ازن کم است و کاربرد آن به تنهایی و برای رسیدن به سطح مطلوب تصفیه، از لحاظ اقتصادی به صرفه نیست، پیشنهاد می شود که این روش در ترکیب با روش های دیگر استفاده شود.

کلیدواژه‌ها

عنوان مقاله [English]

Determination of Optimal pH and Running Time for Treatment of Textile Industry Effluent Using Ozonation Method

نویسندگان [English]

  • Fatemeh Rajab Nia
  • Seyed Hossein Hashemi
  • Reihaneh Rasoolzadeh
  • Saeed Soofizadeh
Department of Environmental Technologies, Environmental Science Research Institute, Shahid Beheshti University, Tehran
چکیده [English]

Wastewater from the textile industry is one of the most polluted industrial effluents. Many different methods have been used for treatment of this type of effluents. Since ozone is a powerful oxidizing agent and attacks the double bonds of the dye molecules, it can be efficiently used for treatment of this type of wastewater. The present study aims to determine the optimum running time and pH for removal of pollutants from the effluent. In the present research, experiments were carried out in a 4.2 l reactor with a 1393.431 mg inlet ozone. Colour and COD removal efficiencies were measured at different time periods and at pH values of 5 and 9. Results show that using the ozonation method under the optimum condition of a pH value of 9 and a running time 90 minutes reduced chemical oxygen demand (COD) by 21.6% and colour by 82.56% (Pt-Co scale), 73.63% (at 400 nm wavelength) and 90.76% (at 575 nm wavelength). Since the use of ozone alone to achieve the desired level of treatment is not .cost effective, it is recommended to use this method in combination with other methods

کلیدواژه‌ها [English]

  • Wastewater
  • textile industry
  • Treatment
  • Ozonation
  • pH

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فصلنامه علوم محیطی
دوره 13، شماره 4
دی 1394
صفحه 37-42

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