Treatment of Oil Wastewater and Electricity Generation by Integrating Constructed Wetland with Microbial Fuel Cell

Abstract

Conventional oil sewage treatment methods can achieve satisfactory removal efficiency, but energy consumption problems during the process of oil sewage treatment are worth attention. The integration of a constructed wetland reactor and a microbial fuel cell reactor (CW-MFC) to treat oil-contaminated wastewater, compared with a microbial fuel cell reactor (MFC) alone and a constructed wetland reactor (CW) alone, was explored in this research. Performances of the three reactors including chemical oxygen demand (COD), oil removal, and output voltage generation were continuously monitored. The COD removals of three reactors were between 73% and 75%, and oil removals were over 95.7%. Compared with MFC, the CW-MFC with a MnO2 modified cathode produced higher power density and output voltage. Maximum power densities of CW-MFC and MFC were 3868 mW/m3 (102 mW/m2) and 3044 mW/m3 (80 mW/m2), respectively. The plants in CW-MFC play a positive role for reactor cathode potential. Both plants and cathode modification can improve reactor performance of electricity generation.

Advanced Bioreactor Treatments of Hydrocarbon-Containing Wastewater

“…A laboratory performance of integrated constructed wetland and MFC reactors (CW-MFC) to treat oil-contaminated wastewater (COD of 520 ± 42 mg/L; oil content of 235 ± 12 mg/L) was compared with the MFC and CW alone [81]. The COD removals of three reactors were between 73% and 75% and oil removals were over 95.7%.…”

Microbial Electrochemical Technologies for Wastewater Treatment: Principles and Evolution from Microbial Fuel Cells to Bioelectrochemical-Based Constructed Wetlands

“…Regarding the treatment of more complex types of wastewater, the performance of a CW-MFC to treat oil-contaminated wastewater was tested along with electricity generation, and compared with single CW and MFC reactors [99]. The design included a laboratory-scale system operating in an up-flow mode with a HRT of 3 days with a carbon brush as anode and a copper plated carbon-felt as cathode.…”

Aspectos relevantes del diseño de humedales construidos acoplados a sistemas bioelectroquímicos para el tratamiento de efluentes y generación de energía

“…Las macrófitas desempeñan un papel fundamental en la configuración de las HC-CCM, ya que estas pueden promover el rendimiento del cátodo debido a la inyección de oxígeno a través de la zona radicular, jugando un papel positivo para el potencial del cátodo debido a que pueden mejorar el rendimiento del reactor en la generación de electricidad (Yang et al, 2016), incrementar la cantidad de microorganismos (Fang et al, 2013), cambiar las propiedades de la superficie y reducir la resistencia interna del cátodo. Según Fang et al (2017) la presencia de plantas en el cátodo aumentó el voltaje; sin embargo, no aumentaron la densidad de corriente de intercambio del cátodo.…”