Development strategy of environmentally friendly sewage sludge incineration technologies in Bureau of Sewerage Tokyo Metropolitan Government

More than half of total greenhouse gas (GHG) emissions from Sewage activities in Tokyo had been originated from the sludge incineration process. Tokyo Metropolitan Government (TMG) has been working on several stages of incineration technologies development to reduce the GHG emissions. Previously, we had developed sludge incinerators that reduce large amount of sludge combustion origin nitrous oxide (N2O) and auxiliary fuel origin carbon dioxide (CO2). Recently, we developed a turbocharged fluidized bed incinerator which enabled to reduce the amount of electricity consumption for the first time. Together with the reduction of N2O and auxiliary fuel origin CO2, the GHG emissions from the incinerator are largely reduced compared with previous types. We have evaluated the effect of the turbocharged fluidized bed incineration technology. Progress of the incinerator development for further reduction of GHG emissions is also reported.