Abstract
Anaerobic digestion is often used as an approach to deal with high COD waste streams. Compared to the aeration systems it allows better energy management due to the biogas production but also has several limitations including inlet waste streams quality and the additional equipment required for energy harvesting. In recent years, the bio-electrochemical systems (BES) and processes are intensively studied as a method for organic waste utilization, including wastewater. They potentially could bring several benefits to the wastewater treatment, mainly due to avoiding aeration (and aeration cost) and direct energy recovering in the form of electricity. Besides their anaerobic nature, the biological processes in BES are respiration-like contrary to the fermentative degradation typical for conventional anaerobic digestion which eventually will provide better mineralization and higher efficiency in terms of COD and BOD removal in such reactors. This study is a direct comparison between conventional anaerobic digestion and Microbial Fuel Cell (as a typical BES reactor) during utilization of wastewater from industrial production of ethanol by fermentation. COD removal rates and dynamics, energy recovery properties and parameters such as secondary sludge production are investigated in order to characterize the feasibility and technological readiness of BES as a step towards their commercialization.
Highlights
This study aims to directly compare conventional anaerobic digestion and Microbial Fuel Cell during utilization of wastewater from industrial production of ethanol by fermentation
For the purposes of this study, the dynamics of Chemical Oxygen Demand (COD) removal in industrial anaerobic digester and Microbiological Fuel Cell constructed as a lab-prototype were compared during utilization of real waste stream from ethanol production and distillation
The COD removal rates are comparable since the values are of same order, but again the advantage of anaerobic digestion is obvious
Summary
It is well known that organic matter in wastewater could be a source of energy and if this potential could be utilized it would meet the demand of the treatment process itself. The sludge streams from domestic and industrial wastewater treatment are stabilized in anaerobic condition in a process which involves digestion, fermentation, gasification, incineration, and pyrolysis [4] [5] [6]. During this treatment the organic matter in the wastes is reduced and some energy is recovered in the form of biogas. The anaerobic digestion works effectively in both mesophilic (30 ̊C - 35 ̊C) and thermophilic (50 ̊C - 60 ̊C) conditions, and for this reason temperature control is often needed [8]
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