<Li> MBT + Anaerobic digestion </Li> <Li> MBT to Refuse derived fuel </Li> <P> During the 2001--2007 period, the WtE capacity increased by about four million metric tons per annum . Japan and China each built several plants that were based on direct smelting or on fluidized bed combustion of solid waste . In China there are about 434 WtE plants in early 2016 . Japan is the largest user in thermal treatment of MSW in the world with 40 million tons . Some of the newest plants use stoker technology and others use the advanced oxygen enrichment technology . There are also over one hundred thermal treatment plants using relatively novel processes such as direct smelting, the Ebara fluidization process and the Thermo - select - JFE gasification and melting technology process . In Patras, Greece, a Greek company just finished testing a system that shows potential . It generates 25kwatts of electricity and 25kwatts of heat from waste water . In India its first energy bio-science center was developed to reduce the country's green house gases and its dependency on fossil fuel . As of June 2014, Indonesia had a total of 93.5 MW installed capacity of WtE, with a pipeline of projects in different preparation phases together amounting to another 373MW of capacity . </P> <P> Biofuel Energy Corporation of Denver, CO, opened two new biofuel plants in Wood River, Nebraska, and Fairmont, Minnesota, in July 2008 . These plants use distillation to make ethanol for use in motor vehicles and other engines . Both plants are currently reported to be working at over 90% capacity . Fulcrum BioEnergy incorporated located in Pleasanton, California, is building a WtE plant near Reno, NV . The plant is scheduled to open in 2019 under the name of Sierra BioFuels plant . BioEnergy incorporated predicts that the plant will produce approximately 10.5 million gallons per year of ethanol from nearly 200,000 tons per year of MSW . </P>

What is one waste product that is produced when non renewable