نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم محیط زیست، دانشکده منابع طبیعی و محیط زیست، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 استاد، گروه حرارت و سیالات، دانشکده مکانیک، دانشگاه صنعتی شریف، تهران، ایران

3 استاد، گروه مهندسی محیط زیست، دانشکده منابع طبیعی و محیط زیست، واحدعلوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

در شرایط کمبود منابع آب شیرین، تصفیه آب‌های آلوده و نمک‌زدایی آب‌های شور و لب‌شور می‌تواند به‌عنوان یک مکانیسم دفاعی درست، به­کار گرفته شود. پژوهش حاضر با هدف بررسی کارایی پیل نمک­زدای میکروبی در مقیاس آزمایشگاهی به‌طور هم‌زمان جهت بررسی فرایند نمک‌زدایی و تصفیه فاضلاب انجام گرفت. بدین‌صورت که یک راکتور سه محفظه‌ای با استفاده از بیوکاتد لجن فعال و فاضلاب سنتتیک به دو روش منقطع و پیوسته در 4 زمان‌ماند مختلف با غلظت g/l ۳۵ نمک بررسی و مطالعه گردید. بر اساس نتایج به‌دست‌آمده، حداکثر آهنگ نمک‌زدایی و آهنگ کاهش EC به­ترتیب 3/52 و 1/51٪ در حالت پیوسته به­دست آمد. pH آنولیت در هر دو حالت منقطع و پیوسته به­ترتیب از 7 به 47/6 و 48/6 کاهش یافت. درصد حذف COD در حالت پیوسته در آنولیت و کاتولیت به­ترتیب 61 و 65% بیش­تر از حذف در حالت منقطع بود. همچنین نتایج حاصل از بررسی روابط آماری بین راندمان سیستم (آهنگ حذف COD، آهنگ نمک‌زدایی و آهنگ کاهش EC ) و زمان‌ماند هیدرولیک و سطح معناداری 05/0Sig<، رابطه مستقیم معناداری بین پارامترهای فوق نشان داد. بررسی روابط آماری بین راندمان سیستم و جریان هیدرولیک پیوسته و سطح معناداری 05/0Sig< نیز نشان داد بین پارامترهای فوق رابطه مستقیم معناداری وجود دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Performance Assessment of Bio-Cathode Microbial Desalination Cell for Simultaneous Desalination and Wastewater Treatment

نویسندگان [English]

  • Avin Habibi 1
  • Madjid Abbaspour 2
  • Amir hossein Javid 3
  • Amir hessam Hassani 3

1 PhD Scholar, Department of Environmental Science, Faculty of Environment & Natural Recourses, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Professor, Department of Heat and Fluids, Faculty of Mechanic, Sharif University of Technology, Tehran, Iran

3 Professor, Department of Environmental Engineering, Faculty of Environment and Natural Recourses, Science and Research Branch, Islamic Azad University, Tehran, Iran

چکیده [English]

Under fresh water shortage conditions, polluted water treatment and brackish water desalination could be a correct defense mechanism in this situation. In the present study, Microbial Desalination Cell (MDC) performance was tested on a laboratory scale to investigate the desalination process and wastewater treatment. The experiments were designed in a three-chamber reactor using activated sludge as bio-catholyte and synthetic wastewater in four different hydraulic retention times and 35 g/l NaCl concentration in two functional mods (batch & continuous). According to the results, maximal salt removal and EC reduction rate of about were obtained in continuously fed mode, respectively. The anolyte pH in both batch and continuous modes dropped from 7 to 6.47 and 6.48 respectively. The chemical oxygen demand (COD) removal values in the continuous mode were 61 and 65% in the anolyte and catholyte respectively, higher than those of fed-batch MDC. Moreover, the result of examining indicated the statistical relationship between system efficiency (salt removal, COD removal, and EC reduction rate) and hydraulic retention time and also between system efficiency and hydraulic flow. On the other hand there is a significant level (Sig< 0.05) which represents direct relationship between the above parameters.

کلیدواژه‌ها [English]

  • Activated sludge
  • Bio-Fouling
  • Bio-cathode
  • Hydraulic Retention Time
  • Microbial Desalination Cell
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