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Effect of petrolume refinery wastewater on plant growth in integrated microbial fuel cell-constructed wetlands systems
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Journal Article
Effect of petrolume refinery wastewater on plant growth in integrated microbial fuel cell-constructed wetlands systems
2020
Overview
تم في هذه الدراسة تنفيذ ثلاثة منظومات متماثلة التصميم للأراضي الرطبة المشيدة - و خلية الوقود الحيوي نوع النبات المستخدم، بهدف معالجة المياه الناتجة من عمليات تكرير النفط و إنتاج طاقة بيولوجية في آن واحد. تم زرع المنظومة الأولى بنبات القنب الهندي، و الثانية بالقصب العادي، و الثالثة بدون نبات و يعتبر كنظام مرجعي. تم تشغيل المنظومات الثلاث بنفس الوقت على النظام الدفقي و بدورتين، لغرض تقييم تأثير مياه تكرير النفط المعالجة بيولوجيا على تطوير و نمو النبات المزروع داخل انظمة المعالجة مع أمكانية إنتاج الطاقة في آن واحد. استمرت فترة التشغيل لكل دورة ثمانية أيام. أوضحت نتائج الدراسة أن أعظم كفاءة إزالة للمحتوى العضوي و المتمثل بطلب الأوكسجين الكيميائي كانت 98.75% ، 97.67% ، و 95.83% للأنظمة MFC-CW1، CW2 MFC-، و MFC-CW3على التوالي. في حين أن أعظم كثافة طاقة ناتجة كانت 19.86، 19.04، و 18.7 ملي و اط / متر مربع للأنظمة MFC-CW1، CW2 MFC-، و MFC-CW3على التوالي، مما يدل على تقارب أداء المنظومات من حيث الكفاءة و توليد الطاقة. أما من حيث نمو النبات، فقد أشارت معدلات النمو النسبي RGR)) لكلا النوعين من النباتات المختارة الى أن نمو البراعم كان بشكل طبيعي طول فترة الدراسة مما يثبت أن آلية التحلل البيولوجي على قطب الأنود داخل خلية الوقود البيولوجية هي الآلية المسيطرة بعملية إزالة الملوثات العضوية بدلا من إزالتها بمساعدة النبات.
Three identically designed microbial fuel cell-constructed wetland (MFC-CW) systems were constructed and setup in this study for simultaneous biotreatment of petroleum refinery wastewater (PRW) and bioelectricity generation. MFC-CW1 and MFC-CW2 were planted with Canna indica, and Phragmites australis, respectively. MFC-CW3 was unplanted and considered as the control. These three systems were operated simultaneously in a batch mode for two cycles to evaluate the effect of PRW biotreatment on the growth and development of the selected plants and the potential of generated bioelectricity as well. The operation period for each cycle was 8 days. Results demonstrated that maximum removal efficiency of the organic content represented as chemical oxygen demand (COD) were 98.75% , 97.67% , and 97.83% observed in MFC-CW1, MFC-CW2, and MFC-CW3, respectively, whereby, the highest power generation were 19.86, 19.04, and 18.7 mW/m2, respectively. On the other hand, both types of plants exhibited notable growth and new sprouts appearance. The potential convergence of the results in the three MFC-CWs, and the healthy growth of both types of plants clearly and potentially indicated that the dominant mechanism of organic pollutant removal was via biodegradation process by the anodic biofilm in the MFC rather than being removed by phytoremediation process.
Publisher
University of Baghdad, College of Agriculture,Jami'at Baghdad,Baghdad University
