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Landfill Leachate Wastewater Treatment System
Process Description
Process
Description
A major problem
associated with modern sanitary landfills is the disposal of
leachate water. The leachate is generated when rainwater percolates
through the landfill and absorbs chemical and biological compounds
from decomposing materials in the landfill. New landfill
regulations require installation of liners and collection systems
for the leachate to prevent this water from entering the surrounding
soil and groundwater. Disposal of the leachate becomes a major
problem for the landfill owner because the leachate often requires
some form of on site treatment to remove toxic metal and organic
contaminants.
Landfill
leachates are highly variable from site to site and over the life of
the landfill. Flows change with the weather; increasing during
rainy weather and decreasing during dry periods. Toxic heavy metal
compounds are common to most landfills. In addition, many types of
organic compounds may be produced. Leachate from young landfills is
high in biodegradable organics. However, as the landfill ages,
contents degrade and produce concentrations of complex organics
which may not be readily biodegradable. Complex chemical/physical
and biological treatment systems may be required.
Application
Generally, the
primary goal in treatment of landfill leachate is to remove metal
compounds. This is done by chemical precipitation and
clarification, followed by dewatering in a……press. Precoating
and/or bodyfeeding with diatomaceous earth or perlite may be
required depending upon the application and nature of the solids
produced.
In addition to
precoating and/or bodyfeeding, cake thicknesses of 25 mm or less may
be required and should be considered during system design due to the
potential difficulty in dewatering of the sludge. A precoat
manifold should also be included to offer additional operational
flexibility.
Locations
Solid Waste
Landfills |
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