Infiltration av lakvatten från specialceller i bioceller / Infiltration of leachate from special cells into biocells
To what extent can infiltration be carried out and which volume can be infiltrated? At the landfill Spillepeng of SYSAV, Malmö, infiltration of leachate has been practiced as a treatment method since 2001. A number of chemical parameters for infiltrating leachate and infiltrated leachate at the landfill Spillepeng have been investigated. Further on, a chemical-hydraulical model for leachate percolation has been developed to analyse to
what extent leachate can be infiltrated without jeopardizing quality and stability of leachate and landfill.
When simulations of the hydraulic retention time in receiving waste cell were performed, a clear correlation was found between hydraulic retention time and porosity. The infiltration velocity affected the hydraulic retention time which implies a dramatic decrease in hydraulic retention time at low infiltration velocities but only a
slight difference when they increase.
Metals are immobilised at leachate infiltration in waste with degradable organic carbon. The only exception from this rule is arsenic.
The results indicate that infiltration of leachate in waste with an organic content is an effective method for preventing metal emissions to the environment. The method is relatively simple and easy to operate and can be developed at the site presupposed that the hydraulic load is considered.