Reactor landfills

Fig. 9.4 Chemical evolution of municipal solid waste landfills ( reactor landfill)...

The effect of released contaminants from reactor landfills on groundwater quality after the failure of a base liner has been calculated by Baccini et al. (1992). The calculation was made for a fictitious model region called Metaland where, for 50 years, one million people managed a groundwater... 

During this very long time period, processes may occur under the impact of changing hydrochemical conditions that lead to a new phase of contaminant mobilization. It is easy to visualize how a process may be initiated when oxidized precipitation infiltrates a post-methanogenic landfill body and a front of increased metal concentrations moves toward the groundwater over a long period of time as a consequence of dissolution and precipitation reactions (Fbrstner et al. 1987). This possibility of metal mobilization from reactor landfills should always be considered when low-organic hazardous waste is deposited, especially if it contain sulfides or easily soluble components. 

Table 10.3. Long-term chemical developments in reactor landfills (Forstner 1994)...

Organic substances as main components of so-called reactor landfills may affect subsequent systems in several ways as ... 

Reactor landfill Final storage Earth s cmst... 

This section reviews the reactor landfill and the processes present within the landfill system. The primary objective of a landfill system is to ensure that waste deposited within the system reaches a final storage quality as rapidly as possible which matches background levels of the earth s crust. Past landfill strategy has simply been to deposit waste in derelict voids or land depressions in the most cost-effective manner with no consideration of the long-term impact on the environment. 

On one hand, the waste mix contains a range of contaminants which when codisposed in a reactor landfill, interact both physically, chemically and biologically and in turn cause a change to the state of the waste by converting the solid material into various liquid, gases and residues. The emissions from landfill sites are to air and water and the final residue reaches a final storage quality after decades or... 

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