Abstract:

Molecular weight distribution of the mixed liquor in membrane bioreactor (MBR) with different powdered activated carbon (PAC) dosage was detected with steric exclusion liquid chromatography.The results showed that macromolecules with molecular weight higher than 10×10³ increased when PAC dosage added from 1 g·L^-1 to 2 g·L^-1.Molecules with molecular weight less than 0.5×103 and within 3×10³—10×10³ kept almost no change, while molecules with molecular weight within 0.5×10³—3×10³ was reduced obviously.Membrane fouling rates were 2.74 and 3.10 kPa·m^-1 respectively, which proved that the membrane fouling was mainly caused by macromolecules with molecular weight higher than 10×10³.