PCB-contamination In A School Building
Indoors
Author(s)
S. Hellman, P. Cajal, P. Martinez, S. Kuusisto & T. Tuhkanen
Abstract
Today substantial amounts of PCB still remain in buildings. PCB is found to be
used in different building materials as a plasticizer, e.g. in paints and elastic
sealing materials. PCB was used in building materials especially in 1960s but
also in the late 1950s and early 1970s. The purpose of the study was firstly to
find and to analyze PCBs used in paints in Finnish buildings indoors. The
question of the amount of hazardous materials in buildings was approached by a
case study in a basement of a school building containing PCB-paint. After
analyses the purpose was to remove the PCB-paint and to see what issues there
are to be concerned about once the PCB-paint is mechanically removed. At first
the original PCB concentrations were analyzed. The greyish floor paint
contained PCBs of about 8 751 mg/kg. The red paint in walls had concentrations
of 23 mg/kg. Since the wall concentration was low, there was no need to remove
that mechanically. Renovation of the room was performed as the floor paint was
removed. Since sandblasting creates a lot of dust, other methods were applied.
The floor paint was removed by grinding. After the removal of the floor paint, all
of the surfaces in a room were washed with detergent water. The PCB
concentrations were analyzed from wipe samples taken after the paint removal
prior to washing and again after the washing. The results show that by removing
the floor paint and by washing all the surfaces the concentrations in the room
were reduced but PCBs were not totally removed. After grinding and washing,
the floor had PCB concentration of about 4 019 mg/kg. The results show
significant PCB-concentrations still after the paint itself had been removed. It
was calculated that originally about 118 g of pure PCB was present in floor paint
Keywords
PCB, paint, renovation, hazardous waste
Related Book
Other papers in this volume
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