A sewage sludge melting process by coke - bed furnace, which is an application of cupola melting technology, was developed. The outline of the course of the development from the bench - scale experiment to the construction of a commercial plant is described. The process is a more sophisticated one which enables high volume reduction, stabilization and utilization of sewage sludge. The slag produced by the process has a volume reduction ratio of 1/9 to 1/40 compared with dewatered sludge, and potential to be utilized as road subbase material and concrete aggregate. The operational cost of the process is estimated to be comparable to that of the conventional ones.

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