[Emergent treatment of source water contaminated by representative chemicals]

Emergent treatment of source water polluted by representative chemical bisphenol-A (BPA) and Di-ethyl phthalate (DEP) was researched. The results indicate that activated carbon adsorption could achieve high efficiencies to remove the two chemicals. The pseudo second-order adsorption kinetic model and Elovich kinetic model can be used to describe the powdered activated carbon (PAC) adsorption process of BPA and DEP in raw water. In pilot test, 50 mg/L PAC dosage can get the pollution concentration of 500 microg/L BPA or 3.3 mg/L DEP comply with the requirement of water quality standard. The dynamic adsorption of carbon-sand filter was also studied, and removal efficiencies of BPA and DEP were hardly influenced by their original concentrations and the filtering velocity among 5.1-15.3 m/h of carbon-sand filter. When PAC adsorption was combined with carbon-sand filter, PAC adsorption contributes most to removing pollution, and carbon-sand filter as the supplement of PAC can strengthen safety. DEP can't be oxidized by KMnO4 or Cl2, but 850 microg/L BPA can be almost completely oxidized by 3 mg/L KMnO4 and 1.5 mg/L Cl2. The oxidation products of BPA as well as their toxicity need further study. PAC adsorption combined with 1.5 mg/L KMnO4 preoxidation can't improve the removal efficiency of DEP, but can improve BPA removal efficiency.