Comparing the flushing and flooding, no relative difference was found between these two methods of nutrient supply in terms of their efficacy of nutrient supply. However, there are aspects of operating and capital cost that needs to be determined to select among these methods of nutrient supply. The flooding method will require a separate vessel of at least equal volume of the BTF reactor to store the nutrient media for flooding. This will increase the capital cost of the biomethanation system. The flushing method does not require additional vessels however, a high flowrate pump will be required.