A Review on the Interspecies Electron Transfer of Methane Production in Anaerobic Digestion System

Anaerobic methanogenesis plays an important role in the sustainable management of high concentration organic wastewater and bioenergy recovery. Interspecies electron transfer (IET) is a new type mutualistic symbiosis that can accelerate microbial metabolism overcome thermodynamic barriers metabolic process, thus facilitating anaerobic methanogenesis. IET classified into Direct Electron Transfer (DIET) Mediated (MIET) according to different methods. This paper summarizes recent research progress related interspecies methanogenic system, describes possible specific mechanisms DIET MIET, analyzes differences between MIET methods terms performance, thermodynamics, kinetics, communities involved them. Finally, it was found that, through DIET, microorganisms process could not only strengthen extracellular alleviate inhibition loading rate, acids, toxic substances, they also help ferment bacteria allow break efficiently degrade complex matter. several problems, such as low efficiency acidification traditional digestion.