Performance and Economic Feasibility of a Sludge/Wastepaper Gasifier System

Thermal gasification of densified sludge/wastepaper fuels has been shown to be technically feasible for the co-disposal of sludge and source­ separated wastepaper. The performance and economic feasibility of a downdraft packed-bed gasifier system fueled with densified sludge/wastepaper and W的tepaper fuels has been evaluated. To assess the performance of the gasifier, a series of gasifier runs were conducted at various air input rates with the use of various densified fuels. In eight of the runs, a densified fuel con­ sisting of剖 percent lagoon-dried sludge and 助 percent recycled wastepaper was used; in five runs, densified wastepaper cubes were used. Gaseous and particu­ late emissions resulting from the com­ bustion of producer gas were measured. Char, a by-product of the gasification process, was evaluated as a substitute for powdered activated carbon. The per­ formance of a small dual-fuel diesel engine combusting producer gas gen­ erated from the gasification of densified wastepaper was also demonstrated. The cost of sludge disposal in sludge-wastepaper gasification system, a