بررسی تاثیر فرآیند انعقاد الکتریکی در حذف آنیون های فسفات، سولفات و نیترات از پساب نیشکر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه مهندسی محیط زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 استادیار گروه علوم و مهندسی آب، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

3 استادیار گروه مهندسی محیط زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

رودخانه‌‌ها و منابع آب به دلیل تخلیه کنترل نشده پساب‌‌‌های صنعتی همواره در معرض انواع آلودگی قرار دارند. فاضلاب صنایع نیشکر شامل غلظت بالایی از آنیون‌‌های فسفات، سولفات و نیترات می‌‌باشد؛ که پیش‌‌تصفیه یا تصفیه کامل این پساب‌ها از مواد مغذی و خورنده امری ضروری است. این تحقیق با هدف ارزیابی تاثیر جریان الکتریکی، pH اولیه و زمان ماند، بر حذف آلاینده‌‌های فسفات، نیترات و سولفات از پساب شرکت نیشکر حکیم فارابی با استفاده از الکترود‌‌های آلومینیومی در روش انعقاد الکتریکی انجام شد. حوضچه سپتیک این شرکت به‌‌عنوان ایستگاه نمونه‌‌برداری انتخاب گردید. pH، فسفات، سولفات و نیترات پساب اولیه اندازه‌‌گیری شد. pH پساب در مقادیر 5، 7، 9 و 11 تنظیم گردید. با استفاده از 6 الکترود آلومینیومی، به صورت عمود بر جریان و متصل به مبدل برق به روش تک قطبی، تاثیر تغییرات pH اولیه، پتانسیل الکتریکی (10 و 30 ولت) و زمان ماند (15، 30، 45 و 60 دقیقه) بر راندمان حذف فسفات، سولفات و نیترات مورد ارزیابی قرار گرفت. نتایج تحقیق نشان داد در شرایط ماند برابر در pH های مختلف با افزایش ولتاژ از 10 به 30 ولت میزان حذف فسفات، سولفات و نیترات افزایش می‌‌‌‌یابد. همچنین نتایج نشان داد بیشترین راندمان حذف فسفات در شرایط pH خنثی حاصل می‌‌شود و با افزایش میزان pH از کارایی حذف فسفات کاسته می‌‌گردد. این در حالی است که بیشترین راندمان حذف سولفات و نیترات در شرایط pH بازی حاصل می‌‌شود. همچنین نتایج آزمایش نشان داد در تمام حالت‌‌های pH و ولتاژ با افزایش زمان ماند، درصد حذف یون‌‌های فسفات، سولفات و نیترات افزایش می‌‌بابد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Electro Coagulation Process for Phosphate’ Sulfate’ Nitrate Removal from Sugar Cane

نویسندگان [English]

  • Majeed Ebadi 1
  • Ali Asareh 2
  • Reza Jalilizadeh Yingejeh 3
1 M.Sc. Student, Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 Assist. Profe. Department of Water Sciences and Engineering, Ahvaz branch, Islamic Azad University, Ahvaz , Iran
3 Assist. Profe. Department oF Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده [English]

Rivers and water resources polloution caused by uncontrolled industrial wastewater discharge. Precence of high concentration of phosphate ' sulfate and nitrate anions in sugarcane indusrial wastewater ' required treatment of the waste water for nutrients and corrosive substances deletion. This study is an attempt to investigate the effect of electrical current' initial wastewater PH and retention time on phosphate ' sulfate and nitrate pollutants removal of sugarcane industrial wastewater. In this study ' the electro coagulation method with aluminum electodes were applied for wastewater treatment in sugar cane of Hakim Farabi. 6 electrodes – aluminium in vertical position were connected to power supply by monopolar method. Septic tank was selected for sampling. Initial wastewater concentration and PH were measured for phosphate' sulfate and nitrate. Then the effect of three operation parameters: PH(5' 7' 9' 11) electrical potential (10 and 30 volts) and retention time (15' 30' 45' 60 minutes) for phosphate ' sulfate and nitrate removal efficiency have been investigated. The results showed that in equal retention time and different initial PH the removal of phosphate' sulfate and nitrate could be promoted by increasing the electrical potential from 10 volt to 30 volt.. The results indicated that the highest removal efficiency of phosphate was observed in neutral condition and increasing PH decreases phosphate removal. whereas the highest removal efficiency for sulfate and nitrate was observed in alkaline PH .also the results proved that in all condition of PH and voltage' increasing retention time cause increasing in removal percent for phosphate' sulfate and nitrate.

کلیدواژه‌ها [English]

  • Electrocoagulation
  • phosphate
  • Sulfate
  • Nitrate
  • Sugare cane
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