بررسی تصفیه پساب صنعت کاغذسازی با به‌کارگیری فرایند ازن‌زنی

نوع مقاله : مقاله پژوهشی

نویسندگان

استادیار، گروه مهندسی شیمی، دانشگاه تفرش، تفرش 79611-39518، ایران

چکیده

در این پژوهش، از فرایند ازن‌زنی به‌عنوان مرحله تکمیلی تصفیه و به‌منظور کاهش میزان اکسیژن موردنیاز شیمیایی و حذف باکتری‌ها به‌ویژه اشرشیا کلی از پساب کارخانه کاغذسازی استفاده شد. روش آماری BBD به‌منظور بهینه‌سازی شرایط تصفیه به‌کار گرفته شد. در این روش اثر سه متغیر حاکم بر فرایند ازن‌زنی شامل میزان pH اولیه پساب، مقدار ازن ورودی(mg/min)  O3 و مدت‌زمان ازن‌زنی t(min) بررسی شد. نتایج نشان داد که مقدار ازن ورودی و pH، بیشترین تأثیر را برای کاهش COD (تا حدود 80 درصد) داشته‌اند. همچنین حداکثر کارایی فرایند ازن‌زنی برای حذف کامل E. Coli، در شرایط اسیدی همراه با مقدار زیاد ازن و افزایش مدت‌زمان ازن‌زنی دیده شد. برحسب این نتایج مشخص شد که ازن به فرم مولکولی و با حمله مستقیم در محیط‌های اسیدی در تخریب آلاینده‌ها نقش داشته است. برای تعیین شرایط بهینه، کمینه‌سازی COD باقیمانده و بیشینه‌سازی کارایی فرایند ازن‌زنی، از نرم‌افزار Design Expert استفاده شد. مقدار pH معادل 2/5، میزان ازن (mg/min131) و مدت زمان (min23) برای رسیدن به کمترین مقدار COD باقیمانده (mg/L48) و بیشترین کارایی (حذف 100 درصدی E. Coli) پیش‌بینی شد. با توجه به بررسی‌های انجام شده در این پژوهش می‌توان نتیجه گرفت که استفاده از فرایند ازن‌زنی به‌منظور کاهش COD و حذف مؤثر E. Coli از پساب کارخانه‌های کاغذسازی یک روش تکمیلی امیدوارکننده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Treatment of Paper Industry Effluent Using Ozonation Process

نویسندگان [English]

  • Meisam Abdolkarimi-Mahabadi
  • Ahmad Bayat
Assist. Prof., Dept. of Chemical Engineering, Tafresh University, Tafresh 39518-79611, Iran
چکیده [English]

In this research, the ozonation process has been used as a supplementary stage of purification to reduce the amount of chemical oxygen demand and remove bacteria, especially E. Coli, from the effluent of the paper industry. Box-Behnken Design statistical method is used to optimize the treatment conditions. In this method, the effect of three variables governing the ozonation process, including the initial pH of the effluent, the amount of input ozone (mg/min) O3 and the duration of ozonation (min) t, was investigated. The results showed that the amount of input ozone and pH had the greatest impact on reducing COD (up to about 80%). Also, the maximum efficiency of the ozonation process for the complete removal of E. Coli was seen in acidic conditions with high amounts of ozone and increasing the duration of ozonation. According to the results, it was found that ozone in molecular form and by direct attack in acidic environments played a role in the destruction of pollutants. Design Expert software was used to determine the optimal conditions, minimize residual COD and maximize the efficiency of the ozonation process. The values of pH=5.2, ozone amount (131mg/min) and duration (23 min) are predicted to reach the lowest residual COD value (48 mg/L) and the highest efficiency (100% removal of E. Coli). According to the investigations carried out in this research, it can be concluded that the use of ozonation process to reduce COD and effectively remove E. Coli from the waste water of paper industry is a promising complementary method.

کلیدواژه‌ها [English]

  • Ozonation
  • Waste Water Treatment
  • Experimental Design
  • Paper Industry

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مجله آب و فاضلاب
دوره 34، شماره 4 - شماره پیاپی 147
مهر و آبان 1402
صفحه 123-136

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