Abstract
A process of powdered activated carbon (PAC) - coagulation sedimentation - Ultrafiltration (UF) was used to investigate the effect of removing organic matter in micro-polluted water. The results showed that the PAC-coagulation sedimentation - UF combined process could remove effectively dissolved organic matter in micro-polluted water. After predosing 15mg / L PAC, the whole removal of CODMn, UV254, DOC was 44.94%, 35.42%, 25% respectively, and it was increased 14.17%, 17.71%, 16.00% compared with the coagulation sedimentation - UF process. It was avail to remove small organic molecules by dosing PAC, particularly for organic matter of molecular weight between 1000u and 3000u. The PAC - coagulation sedimentation - UF process removed DBPs precursors of chloroform in a certain extent and the removal rate of chlorine-dibromo, dichloro, bromine, carbon tetrachloride, bromoform was 31.52%, 4.84%, 16.29%, 15.12% and 28.57% respectively. It was found that hydrophobic organic compounds was the major factor in membrane fouling, PAC - coagulation sedimentation - UF process could effectively remove hydrophobic organic compounds, improve membrane flux and alleviate membrane fouling.
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