To determine the effect of reactor design and method of heating on the efficiency of methane fermentation and composition of microbial communities, especially methanogenic Archae.
Methane fermentation is a process used to manage diversified industrial wastewater (removal of organic compounds) as well as biogas production. In this study, two different reactor types (trickling-bed reactor and submerge-bed reactor) were put in chambers, heated by microwaves or by hot air (control group).
|Exposure duration||28 days (remark EMF-Portal: not sure if continuously exposed)|
|Chamber||trickling-bed reactor or submerge-bed reactor with a diameter of 3 cm and a working volume of 0.5 l|
|Setup||two reactors of each type were placed in a chamber; in the trickling-bed reactors, wastewater from retention tanks located below the reactor was pumped to the surface of the bed (down-flow); in the submerge-bed reactors, wastewater from the reservoir was pumped from the bottom of the bed and returned to the reservoir (up flow)|
|Additional info||fermentation was carried out at 35 +/- 1.5 °C.|
In both fermenter types heated by microwaves, statistically significant higher values for biogas production were found compared to heating with hot air. The highest biogas production was observed in the trickling-bed reactor with microwave heating, while the highest diversity of methanogenic Archae was found in the microwave heated submerge-bed reactor.
The authors conclude that heating with microwaves increased the efficiency of methan fermentation.