Biodegradable waste includes any organic matter in waste which can be broken down into carbon dioxide, water, methane or simple organic molecules by micro-organisms and other living things by composting, aerobic digestion, anaerobic digestion or similar processes.
Depending on the nature of the organic waste and desired end products, an appropriate method of recycling should be adopted. Human wastes like sewage and fecal wastes should be recycled via anaerobic digestion whereas sewages can be treated with thermophilic digesters.
It depends on your experiment objectives and targeted end products. If your primary goal is volume reduction and desired end product is compost then go for aerobic digestion. However, if you are opting for energy production and waste stabilization then go for anaerobic digestion. Besides, you have to consider the optimum temperature condition (i.e.mesophilic, or thermophilic) for epigeic earthworms to decompose the organic waste as well.