出版社：Instituto de Pesquisas Ambientais em Bacias Hidrográficas
摘要：Atrazine (2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine) is a persistent herbicide used on some crops and it has been found both in ground and surface water and drainage systems.This work studied the behaviour of atrazine during a sewage treatment process by activated sludge.The process was conducted on a laboratory scale using an under fed-batch system with a hydraulic retention time of 24 hours.After this period, the raw sewage (with atrazine) was changed and another batch was begun (the sludge age was 7 days old).Radiolabel molecules (14C-atrazine) were used for to trace their fate and to measure to the 14C-CO2 and the residues of atrazine were analysed by HPLC/UV.Initially about 50% of radioactivity was sorbed by the settled sludge but it was desorbed with successive additions of raw sewage without atrazine.The final balance of radioactivity showed that 98% of the atrazine was released into the treated effluent, probably without any biodegradation.Therefore, other organic micropollutants with similar characteristics to atrazine may behave a similar way.
