THE MOBILISATION OF POLYCYCLIC AROMATIC HYDROCARBONS N(PAHs) FROM THE COAL-TAR LINING OF WATER PIPES

Presence of polycyclic aromatic hydrocarbons in water (PAH). Used for pipe corrosion protection, coal tar produces PAH in drinking water. The mobilization mechanisms are investigated. Chlorine and chlorine dioxide used for disinfection, anaerobic conditions or long residence time were identified as important factors increasing the PAH concentration in water. Flow destabilizations or maintenance operations give a release of biofilm aggregates that are contaminated by PAH and induce a water pollution