Ingenieur Vol. 75 ingenieur July 2018-FA - Page 65

Figure 5: Integrated system of MFC-wastewater treatment plant. activated sludge process. This is significant given that sludge management and high COD effluent are considerable problems in industrial wastewater treatment. As illustrated in Figure 5, the integrated mechanisms using MFC could be applied in the primary and/or secondary wastewater treatment stages. The nature of liquid sludge in the primary sedimentation tank could be utilised as feed in the first MFC reactor and the minimal sludge production with lower value of COD being drained away to the next stage of treatment. The electricity produced from the first MFC reactor could possibly be used to partially power the first stages of treatment process. Secondary treatment that normally consists of an anaerobic chamber, which has undergone activated sludge process, can act well as an anode by incorporating an electrode inside the reactor chamber. The activated sludge would provide good and diverse exoelectrogenic bacterial strains that can power the process itself, hence, significantly reducing the need of external power supply to run the wastewater treatment plant. The subsequent clearer flow resulting from low sludge accumulation by a second MFC system following the tertiary treatment stage would require a less stringent clarification process before final discharge. sugars and be upgraded to be robust enough to fulfil industrial needs. MFC demonstrates the potential to alleviate growing energy demands. The indigenous exoelectrogenic micro-organisms that are freely isolated from wastewater are the advantages we need to seriously consider using in this breakthrough technology. Although the research endeavours over the last decades have improved the power generation by several orders of magnitude, further efforts are required to transform this system into a real world application. Also, Government policies should aid the generation of ethanol production especially for the growing transportation and agro-based industrial sectors. Concluding Remarks Murori, K. (2016, May). Urine Power: This could be Africa’s Solution to Sustainable Energy. The African Exponent. To economically convert lignocellulosic biomass into bioethan