Proceedings

Beijing, China currently transports dewatered, digested and undigested sludges to rural areas for stockpiling and traditional
agricultural use. As the city grows, this is no longer a viable option. Several new wastewater treatment plants are expected
to be on-line by 2008 which will nearly double the current sludge production. This study recommends that Beijing use
combined heat drying/composting as the primary utilization strategy. It also recommends Beijing divert as much sludge as
practical to pre-calciner type cement kilns for air pollution control, and to conventional cement kilns as supplemental fuel to
be burned with coal and limestone.

KEY WORDS
Sludge, Biosolids, China, heat-drying, composting, cement kilns