Evaluation on chlorination effect and halogenated hydrocarbon production of hospital wastewater treated by membrane bioreactor

  Objective   To study the advantages that membrane bioreactor(MBR)was used in disinfection of hospital waste water.

  Methods   Plate count for the tolal bacteria, filter membrane method for the fecal coliform group and headspace gas chromatography for the halogenated hydrocarbon.

  Results   The proper dose of sodium hypochlorie, contact time, total halogenated hydrocarbon production after disinfection of influent and effluent were 14.0 mg/L, 60 mm, 26.40μg/L and 1.0 mg/L, 1.5 min, 7.98μg/L respectively.

  Conclusion   Higher disinfectant efficiency and less disinfection by-products(DBPs) production were achieved as for disinfection of MBR effluent at lower dose of disinfectant.For better disinfect effect of hospital wastewater, the dose of disinfectant and contact time could not be intensified bindly.