In Sweden there are many old landfills of which the content is more or less unknown, Theleachates from these are of varying quality, mirroring the waste deposited in the landfills,Metals commonly occurring in leachates are i,e, zink (Zn), lead (Pb), cupper (Cu) and nickel(Ni), Ni is of particular interest due to the un-predictable mobility of the metal, For small,weak leachates a passive low-cost treatment system can be suitable, Reactive filter technologyis one alternative and by using by-products from national and global industries theenvironmental benefit could be further increased, Pine bark (from pulp and paper industry)and blast furnace slag (from steel manufacturing) are examples of such materials, Designingfilters for removal of metals from leachate includes taking a series of parameters into accountAt the landfill site in Eskilstuna, Sweden, a facility was designed as a pilot study, Fourcolumns were filled with filter material, The materials were sand, amorphous and crystallineblast furnace slag and pine bark, The aim was to investigate parameters significant for metaluptake from landfill leachate, A screening of the metals, physio-chemical parameters andsome organic pollutants was conducted for a period of five months, A part from this, a batchexperiment was conducted, Contact time, initial concentration, other leachate components andpH are examples of parameters that have a significant influence on the metal removingcapacity of a filter,
Blast furnace slag and pine bark as potential filter media for metal sorption from landfill leachate
