Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. is engaged in
the development, design/production, installation and after-sales service/operation management of
facilities to treat or dispose of waste including municipal refuse and sewage sludge.
In recent years, sludge is required to be reduced in volume, both domestically and abroad,
because of an increase in sludge discharge quantity with the sophistication of social economic
activities, as well as due to final landfill site stringency. The characteristics of sludge are also
diversifying and accordingly we developed a new-type sludge dryer that can dry even hard-to-dry
high viscosity sludge appropriately and stably to be recycled as a means to reduce the amount of
sanitary landfill for disposal through volume reduction.
This paper outlines our efforts to develop a sludge dryer suitable for the diversified
characteristics of sludge such as higher viscosity, and then describes the operation results of its
demonstration plants.
