بررسی حذف سورفکتانت آنیونی با استفاده از روش انعقاد و شناورسازی الکتریکی تک قطبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی عمران- محیط‌زیست، دانشگاه تربیت مدرس، تهران، ایران

2 دانشیار، دانشکده مهندسی عمران و محیط‌زیست، دانشگاه تربیت مدرس، تهران، ایران

چکیده

سورفکتانت‌ها دسته‌ای از ترکیبات شیمیایی هستند که اثرات زیست‌محیطی بسیاری از قبیل تغذیه‌گرایی، تولید کف و کاهش اکسیژن محلول دارند. این پژوهش با هدف بررسی آزمایشگاهی حذف سورفکتانت آنیونی سدیم دودسیل بنزن سولفونات با استفاده از سیستم شناورسازی الکتریکی انجام شد. پایلوت مورد استفاده به شکل مکعب مستطیل با حجم مفید 735 میلی‌لیتر شامل الکترودهایی مشبک (مش‌بندی شده) و تک قطبی از جنس فولاد ضد زنگ به‌صورت افقی بود. در این پژوهش پارامترهای مؤثر بر فرایند شامل فاصله بین الکترودها 5/0 تا 5/1 سانتی‌متر، غلظت اولیه سورفکتانت 50 تا 1000میلی‌گرم در لیتر، pH (3 تا 11)، شدت جریان الکتریکی 5/0 تا 5/1 آمپر و هدایت الکتریکی 950 تا 3500 میکروزیمنس بر سانتی‌متر به‌روش تک متغیری بررسی و بهینه شد. طبق نتایج حاصل شده بهترین درصد حذف سورفکتانت و COD در طول یک ساعت آزمایش به‌‌ترتیب 84/93 و 90 برآورد شد. این نتیجه در شرایط pH برابر با 8، فاصله یک سانتی‌متر بین الکترودها، غلظت اولیه سورفکتانت برابر با 750 میلی‌گرم در لیتر، یک آمپر جریان الکتریکی و 1440 میکروزیمنس بر سانتی‌متر هدایت الکتریکی حاصل شد. در این شرایط میزان انرژی مصرفی 020/45 کیلو وات ساعت بر کیلوگرم سورفکتانت حذف شده و انحلالآند معادل 04/1 کیلوگرم آهن بر کیلوگرم سورفکتانت حذف شده بود. نتایج آزمایشگاهی به‌دست آمده در این پژوهش نشان داد که حذف سورفکتانت آنیونی از قبیل مایع ظرف‌شویی با استفاده از سیستم شناورسازی الکتریکی انجام‌پذیر است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Anionic Surfactant Removal Using Unipolar Electro-Flotation and Electro-Coagulation

نویسندگان [English]

  • Mahta Nazari 1
  • Bita Ayati 2
1 MSc of Environmental Engineering, Tarbiat Modares University, Tehran, Iran
2 Assoc. Prof., Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran
چکیده [English]

Surfactants are considered as chemical combinations with many environmental impacts such as eutrophication, foam generation, and oxygen reduction. This experimental study is conducted to evaluate the removal of Sodium dodecyl benzene sulfonate (SDBS) using unipolar electro-flotation and electro coagulation system. The experimental set up was installed as a cubic shape with effective volume of 735 ml and stainless steel mono-polar electrodes arranged in a horizontal fashion. Parameters evaluated individualy for the overall system optimization include: distance between electrodes (0.5-1.5 cm), surfactants initial concentration (50-1000 mg/L), pH (3-11), current density (0.5–1.5 A), and electric conductivity (950-3500 S/cmμ).  Results obtained during the 1 hr operation time showed that the optimum surfactant and COD removal efficiency were about 94 and 90 percent, respectively. This optimum removal eficciencies were accomplished under the following condition: pH=8, distance between electrodes =1 cm, initial surfactant concentration = 750 mg/L, current density = 1 A, and EC = 1440 μS/cm . In addition, the energy consumption and anode dissolution were 45.03 kWh/kg and 1.04 kg Fe/kg for SDBS removal, respectively. In conclusion, the results obtained in this study support the application of electro-flotation and electro coagulation as an appoperiate system for the removal of surfactants such as detergent.

کلیدواژه‌ها [English]

  • Sodium Dodecyl Benzene Sulfonate (SDBS)
  • Anionic Surfactant
  • Electro-flotation
  • Electro- coagulation
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