Renewable Chemicals and Biofuels from Waste to Close the Loop of the Circular Economy. David McConnell, VP, Business Development, Enerkem Inc. The Power Behind Farm Powered: Highlighting the Benefitss of Farm-Based Anaerobic Digestion. Topher Gudmand. Vanguard Renewables The Inputs and Outputs of Dry Anaerobic Digestion and MSW. Jeff Draper, VP, Zero Waste Energy, LLC. CA