The efficacy of gravel bed hydroponic system in the removal of DDT residues from sewage effluent

摘要

A high performance liquid chromatography method was employed to monitor DDT and some of its metabolites in sewage effluent which had undergone primary treatment. A gravel bed hydroponic (GBH) system was designed to treat the effluent in order to reuse it in agricultural purposes. The system was made of six channels covered with common reeds (Phragmitis australis). High concentrations of DDT-type residues were detected in the effluent. Results indicated the ability of GBH system to remove more than 80% effluent-borne DDT residues.