Combined MgO nanoparticle and microwave pre-treatment on biogas increase from Enteromorpha during anaerobic digestion

Abstract

This study evaluated the anaerobic digestion of MgO metal-oxide nanoparticles combined with microwave pretreatment to increase biogas production from microalgae. The result shows the maximum total biogas yield of 342ml and 320ml were achieved by the MW pretreatment of 800W, 4min +15mg/L MgO NPs group and 600W, 6min +5mg/L MgO NPs group, which are 1.38 and 1.30 times compared to control, respectively. The influence of metallic oxide (MgO) NPs and MW pretreatment on anaerobic digestion of Enteromorpha resulted in significant increase in cumulative biogas production. The modified Gompertz equation and Logistic function model were used to simulate the nanoparticle-enhanced anaerobic digestion process, which demonstrate that the modified Gompertz equation can better simulate the fermentation process of microalgae.