Techno-economic analysis of electron beam irradiation pretreatment of corn straw for anaerobic digestion

Abstract

The complexity of anaerobic digestion process and the risks of investing in new technologies are the main obstacles to improving anaerobic digestion technology. There is still a gap between research results and commercial applications. This study investigated the techno-economic feasibility and bottlenecks of introducing electron beam irradiation pretreatment technology into the commercial-scale anaerobic digestion plant. Model construction, parameter initialization and economic analysis were performed in SuperPro Designer software. The parameters used in the model were derived from experimental results, software built-in model and recent literature. The results show that the gross margin, return on investment, payback time, internal rate of return, and net present value of the system with electron beam irradiation pretreatment are 4.4 %, 9.8 %, 10.1 years, 8.0 % and $0.6 million, respectively. The corresponding values of the system without electron beam irradiation pretreatment are 9.9 %, 11.1 %, 8.9 years, 9.7 % and $1.5 million, respectively. The main factor affecting gross profit is tipping fee of liquid anaerobic digestion effluent, followed by plant size of anaerobic digestion, degradation efficiency of corn straw, and compost price. This study has guiding significance for the application of electron beam irradiation pretreatment technology in the production of renewable energy from lignocellulosic biomass.