Evaluation Of Biostimulation On Biogas Production Of Anaerobic Digested Wastewater Due To Magnetic Field And Magnetic Nanoparticles

Abstract

Researchers have conducted studies using various technologies to improve biogas production via the anaerobic digestion process. Among these technologies, the addition of magnetic nanoparticles and exposing the AD system to an external magnetic field have received a lot of attention due to the positive results. The current study was conducted to assess the effect of an external magnetic field (MF) and magnetic nanoparticles (MNP) on the biostimulation of a biochemical methane potential (BMP) assay for wastewater treatment. The BMP system with 0.5 g MNP and 3 hours MF exposure had higher contaminant degradability, with 81.87% COD, 82.77% color, and 81.98% turbidity reduction. The same system had a 20% increase in TS digestion, resulting in a biogas yield of 250 mL/day and 97.14% methane composition. When compared to the control with 3 hours MF and no MNP, the control had 56.88%, 64.30%, and 59.57% COD, color, and turbidity reduction, respectively. The control system produced 135 mL/day of biogas and 79.72 % methane. The maximum output was observed after an exposure time to MF of 3 hours, however, as the exposure time increased beyond 3 hours, the efficiency decreased by 2-4%. The addition of MNPs to the BMP system, as well as additional exposure to an external MF, was discovered to improve biogas production and methane yield by 40% and 20%, respectively.