Waste-to-energy is the process of creating energy in the form of electricity or heat from a waste source. WtE is a form of energy recovery. Most WtE processes produce energy through combustion, which contributes to greenhouse gas emissions, whereby, the BioStar anaerobic digestion waste to energy process does not. WtE projects produce a combustible fuel commodity, such as methane, methanol, ethanol or synthetic fuels.
Anaerobic digestion is a century’s old process of converting organic matter into methane and ammonia. Generally performed in lagoons or tanks, anaerobic digestion is the biological treatment of liquid waste using bacteria in the absence of air to promote the decomposition of organic solids. Viable feedstock materials typically include animal manure, food waste, and other organic wastes. The anaerobic digestion process works similar to an animal’s natural digestive system, where enzymes break down organic matter in the absence of oxygen. Methane and ammonia are two primary by-products of the process. The methane biogas RNG (Renewable Natural Gas) is used for fuel or, electricity. The resultant nutrient-rich liquid can be pumped onto fields as fertilizer. The methane, a.k.a. biogas, can be used as transportation fuel, natural gas heating, or running through a CHP to generate electricity which can be injected in the interstate pipeline and sold to local utilities.