Coffee husks can be used to make activated carbon used to make honeycomb monoliths. The waste product of the coffee industry can be used to make these monoliths which can be used in bio reactors to absorb methane.
The monoliths are recycling husks from the coffee industry which makes it a sustainable option
The production of biogas is a renewable source of energy
Creates a industry in making activated carbon which can also be used for water purification