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Ash use
Applications: Landfills

Better environment when landfills are covered with ash

Most of the energy ash today is used to cover old dumps. Within a few years most land­lls are covered and that requires new applications to avoid mountains of ash.

The most important use for the ash has long been as construction materials in Swedish landfills. By covering the dumps with ash, leakage of potentially hazardous substances in soil and water and greenhouse gas emissions are reduced. A conscious environmental strategy has, however, caused a steady reduction in the amount of landfilled waste and many dumps have been closed down. Today, waste from households and industries is seenas a resource rather than a problem. The waste
is burned in Sweden's district heating plants and thus contributes to the production of electricity and heat.

Prevents leakage and emission
Today there are about 150 landfills in operation and thesefulfill completely different requirements than the old dumps. Today's landfills are constructed with a sealing layer to protect the surrounding environment. Landfills now function just like the rubbish bag under the sink at home. The bag encloses the waste and when full, it is tied together. The ash is used both as a filler, in order to stabilize the waste, and in the sealing layer, the "bag", enclosing the waste. Of special interest is to make dense layers of a mixture of fly ashes and municipal sludges. Mining waste also can be covered using ash, to reduce leaching of metals.

Ready for new tasks
Within a decade, Sweden's landfills will be covered. This calls for new uses for the 1.5 million tons of energy ash produced each year in Swedish district heating plants. Two areas where energy ash has great potential are as a resource building roads and ports. The ash also plays an important role in a functioning cycle. By returning bio
ash to the forest, acidification caused by an increased extraction and use of biofuels is prevented.

 

 
 
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