Newsletter and Technical Publications
<International Source Book On Environmentally Sound Technologies
for Wastewater and Stormwater Management>
5.7 Sludge disposal
Final or ultimate disposal of sludge, which cannot be reused, is by
landfilling or incineration. Since sludge for landfilling usually contains heavy
metals or toxic chemicals, lining of the landfill with clay or plastic liner may
be required to prevent contamination of groundwater. Incineration of sludge is
by a multiple hearth furnace or fluidised bed furnace. Energy input is required
to dry the sludge before combustion is self-sustaining. Combustion flue gases
usually need treatment to meet air pollution control standards. Investment and
operating costs are high.
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