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

Holt P K. Electrocoagulation: Unravelling and synthezising the mechanisms behind a water

treatment process; 2000.

WHO.WHO Guidelines for Drinking-water Quality. 2010; 1(3).

USEPA. EPA Office of Compliance Sector Notebook Project: Profile of the Textile Industry.

; EPN3 10-R-97-009.

USEPA. Manual Best Management Practices for Pollution Prevention in the Textile Industry.

; EPA/625/R-96/004.

Barclay S, Buckley C. Waste Minimization Guide for the Textile Industry–A Step Towards

House Cleaner Production. UNEP/IEO ICPIC International Cleaner Production Information

Clearing; 1993; 3.

Soloman PA, Basha CA,Velan M, Ramamurthi V, Koteeswaran K, Balasubramanian N.

Electrochemical degradation of Remazol Black B dye effluent. Clean- Soil, Air, Water; 2009; 37(11):889 – 900.

Kariyajjanavar P, Jogttappa N, Nayaka YA. Studies on degradation of reactive textile dyes

solution by electrochemical method. Journal of hazardous materials; 2011; 190(1): 952-961.

Novotný, Č., Svobodova, K., Benada, O., Kofroňova, O., Heissenberger, A., & Fuchs, W.

Potential of combined fungal and bacterial treatment for color removal in textile wastewater. Bioresource technology; 2011; 102(2): 879-888.

Pearce C I, Lloyd J R, Guthrie J T. The removal of color from textile wastewater using whole

bacterial cells: a review. Dyes and pigments; 2003; 58(3): 179-196.

Kumar P, Prasad B, Mishra I M, Chand S. Decolorisation and COD reduction of dyeing wastewater from a cotton textile mill using thermolysis and coagulation. Journal of hazardous materials; 2008; 153(1): 635-645.

Radha KV, Sridevia V, Kalaivani K. Electrochemical oxidation for the treatment of textile industry wastewater. Bioresour. Technol; 2009;100: 987–990.

Song S, Yao J, He Z, Qiu J, Chen J. Effect of operational parameters on the decolorisation of

CI Reactive Blue 19 in aqueous solution by ozone-enhanced electrocoagulation. Journal of hazardous materials; 2008; 152(1): 204-210.

Akbal F, Kuleyin, A. Decolorization of levafix brilliant blue E‐B by electrocoagulation method.

Environmental Progress & Sustainable Energy; 2011; 30(1): 29-36.

Singh K, Arora S. Removal of synthetic textile dyes from wastewaters: a critical review on present treatment technologies. Critical reviews in environmental science and technology; 2011;

(9): 807-878.

Meriç S , Selçuk H , Belgiorno V. Acute toxicity removal in textile finishing wastewater by

Fenton's oxidation, ozone and coagulation– flocculation processes. Water Research; 2005; 39(6): 1147-1153.

Ciardelli G, Ranieri N. The treatment and reuse of wastewater in the textile industry by means of

ozonation and electroflocculation. Water Research; 2001; 35(2): 567-572.

Wu Wu C H, Chang C L, Kuo C Y. Decolorization of Procion Red MX-5B in electrocoagulation (EC), UV/TiO 2 and ozonerelated systems. Dyes and Pigments; 2008; 76(1): 187-194.

Selcuk H. Decolorization and detoxification of textile wastewater by ozonation and coagulation processes. Dyes and Pigments; 2005; 64(3): 217- 222.

Abrishamchi A. Wastewater engineering. Tehran, Iran, Tehran University Press 1389; 1.

Ebadi A, Mohammadzadeh S. Different methods of Ozon generation. Chemical Engineering Journal; 1383; 11: 40-47.

AnjaneyuluY, Sreedhara Chary N,Samuel Suman Raj D. Decolourization of industrial effluents available methods and emerging technologies – a review. Reviews in Environmental Science and Bio/Technology; 2005; 1 (4): 245–273.

Bernal-Martinez L A, Barrera-Diaz C, SolisMorelos C, Natividad R. Synergy of electrochemical and ozonation processes in industrial wastewater treatment. Chemical Engineering Journal; 2010;165 (1): 71-77.

Hach CompanyDR 2800 Spectrophotometer proceures manual; Catalog Number DOC022.53.00725. Germany; 2007.

Song S, He Z, Qiu J, Xu L, Chen J. Ozone assisted electrocoagulation for decolorization of

CI Reactive Black 5 in aqueous solution: An investigation of the effect of operational

parameters. Separation and purification technology; 2007; 55(2): 238-245.

APHA. Standard Methods for the Examination of Waters and Wastewaters. Washington DC,

USA, American Public Health Association (APHA); 2005.

Aplin R, & Waite T D. Comparison of three advanced oxidation processes for degradation of

textile dyes. Water Science & Technology; 2000; 42(5-6): 345-354.

Zhang J, Lee K H, Cui L, Jeong T S. Degradation of methylene blue in aqueous solution by ozone-based processes. Journal of Industrial and Engineering Chemistry; 2009; 15(2): 185-189.

Alsheyab M, Munaz A H. Reducing the formation of THMS by ozone combined with hydrogen peroxide. Desalination; 2006; 194: 121-126.