Study on microfiltration combined process for micro-polluted surface water treatment

  Objective   To study micro-polluted surface water treatment by the PAC-MBR combined process and to investigate the quality of treated water and main part of membrane foulants.

  Methods   Conventional parameters were detected by the standard methods which were issued by the National Environmental Protection Bureau.The molecular weight distribution(MWD)was measured by steric exclusion liquid chromatography(SE-LC).The MWD of membrane foulants was compared with that of raw water, mixed liquor and treated water to determine the range of molecular weight of the major membrane foulants.

  Results   Turbidity and COD_Mn of the treated water reached the requirement of Sanitary Standard for Drinking Water Quality(2001), furthermore ammonia nitrogen was removed effectively.

  Conclusion   The matter with macro molecule is the main part of membrane foulants and the removal of them from mixed liquor is mainly due to membrane separation, while PAC absorption and biological degradation show the advantage on removal of the matter which molecular weight between 500 and 10 000 Dalton.