Presentation on theme: "PCB: Detoxification of building materials in DK Presentation for EURITS d. 14 May 2012 Lars Gunnarsen Danish Building Research Institute, Aalborg University."— Presentation transcript:
PCB: Detoxification of building materials in DK Presentation for EURITS d. 14 May 2012 Lars Gunnarsen Danish Building Research Institute, Aalborg University
Sum 7 congeners: 28, 52, 101, 118, 138, 153 og 180 2 dioxin-like congeners: 77, 81, 105, 114, 118, 123, 126, 156, 157, 167, 169, og 189 All PCB congeners akkumulate in human bodies 105 og 118 has WHO TEF på 0,0001 and for 156 it is 5 times bigger Highest TEF has nr. 126 with TEF equal 0,1 Vapor pressure of PCB 118 at 25 C is 8.974 × 10–6 mmHg = 0.001196 Pa = 1.18 × 10 -8 atm. In air at 1,013 × 105 Pa (1 atm) this is equal to 12 ppb or 160 µg/m3 Occupational TLV is 0 µg/m3 The national Board of Health reccomends action limits set at 3 and 0,3 µg/m3 for indoor air PCB fundamentals
Construction products Indoor air Surface Dust Soil
1950 to 1976 where PCB containing sealant were on the marked 143 mill. m 2 new buildings have been erected which is 37 % of the total building stock of 389 mill. m 2. Have not got new windows since 197661 % Have rubber-like inner sealants59 % Have rubber-like outer sealants22 % Length inner sealants per area0,47 m/m 2 Length inner sealants per area0,47 m/m 2 Total remaining PCB in construction products 20 x10 3 kg Mass primary PCB sources 6.6x10 6 kg Mass secondary sources 3.4x10 9 kg Some inofficial guestimates
EKSP(34,92 - 11,624*1000/(t + 273)) Temperature dependency of vapor pressure Equation valid 40-55 o C
> 50 mg PCB/kgDangerous wasteTo be destructed at approved inceneration plant or deposited underground (not possible in Denmark) 0,1 – 50 mg PCB/kgNot dangerous waste Waste with PCB content of less than 1 mg/kg may be deposited at depot for inert waste Waste with PCB content between 1 and 50 mg/kg, may be deposited at depot for for mineral waste or mixed waste < 0,1 mg PCB/kgProducts for reuse May be reused according to other specific rules after notification of municipal authorities
Action values for building occupancy. > 3.000 ng PCB/m 3 airHighest level. Immediate action required. Durable sollutions - could be evacuation of building - should take place before 6 months. 300 – 3.000 ng PCB/m 3 airIntermediate level. An action plan required to after some time assure indoor air concentrations below 300 ng PCB/m3 luft. At 2.000 – 3.000 ng PCB/m3 it is recommended that a maximum of one year may pas before a durable solution is commenced. At 300 – 2.000 ng PCB/m3 it is recommended that a maximum of two years may pas before a durable solution is commenced. Temporary alleviation measures should be considered. < 300 ng PCB/m 3 airLowest level that does not increase the health risks. PCB exposure from indoor air and health risks in relation to recommendations from National Board of Health Recommendations are based on occupancy of buildings 24-7 for several years.
PCB congener NumberConcentration, mg/kg AverageMin25 percentileMedian75 percentileMax Sum 2420100817,4187,04556,5101040,0168584,8221677,0 Sum_DL1913472,329,41071,715836,822370,726382,3 Sum_NDL2087274,4157,53465,980113,3152273,9206043,0 Total PCB (6)20252149,7436,07005,2165207,5500091,3718430,0 Total PCB (6+1)20283017,0511,69678,8210992,5538203,8749330,0 PCB content in selants in contaminated part
Conclusions There still is PCB in some buildings – maybe in approximately 10% of the buildings from the relevant period Old sealants with PCB, will still be a significant source of PCB in indoor air, surface dust and the soil around the buildings. In rare cases this may lead to health risks for the building occupants PCB in dwellings leads to a significantly increased PCB contamination of building occupants. For these people the dwelling causes by far the most PCB intake Better ability to identify buildings with PCB is recommended More efficient means of renovation of PCB contaminated buildings are recommended More rigorous waste hanling recommended More reseach, innovation and consistency recommended
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