<P> Food waste can be composted at home, avoiding central collection entirely, and many local authorities have schemes to provide subsidised composting bin systems . However, the proportion of the population willing to dispose of their food waste in that way may be limited . </P> <P> Anaerobic digestion produces both useful gaseous products and a solid fibrous "compostable" material . Anaerobic digestion plants can provide energy from waste by burning the methane created from food and other organic wastes to generate electricity, defraying the plants' costs and reducing greenhouse gas emissions. The United States Environmental Protection Agency states that the use of anaerobic composting allows for large amounts of food waste to avoid the landfills . Instead of producing these greenhouse gasses into the environment from being in a landfill, the gasses can alternatively be harnessed in these facilities for reuse . </P> <P> Since this process of composting produces high volumes of biogas, there are potential safety issues such as explosion and poisoning . These interactions require proper maintenance and personal protective equipment is utilized . Certain U.S. states, such as Oregon, have implemented the requirement for permits on such facilities, based on the potential danger to the population and surrounding environment . </P> <P> Food waste coming through the sanitary sewers from garbage disposal units is treated along with other sewage and contributes to sludge . </P>

Where does most of the waste occur in projects and why