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Three identical MFC-CW systems were constructed to treat petroleum refinery wastewater, with two planted and one unplanted, demonstrating high removal efficiency of COD and power generation, with both types of plants exhibiting notable growth.

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What they did

System
MFC

What worked

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Abstract

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.

Key findings

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Keywords

Microbial fuel cellPhragmitesWastewaterPulp and paper industryBiodegradationChemical oxygen demand

Identifiers

DOI
10.36103/ijas.v51i4.1105
Journal
IRAQI JOURNAL OF AGRICULTURAL SCIENCES
Year
2020