The invention discloses a method for treating
sewage of a pharmaceutical factory. The method comprises the following steps: introducing
sewage into a primary filtering tank for preliminary
filtration,introducing the
sewage into a dust sand tank, adding a flocculating agent with a
mass-volume ratio of (120-180g):1L to the sewage, carrying out stirring for 5-15 min, then carrying out stirring for 30-40 min at a rotating speed of 150-250 r / min, introducing sewage into an
aeration tank, and introducing
oxygen into the
aeration tank; introducing the sewage in the
aeration tank into a photoreactor,adding H2O2 with a
mass content of 20%, carrying out irradiating with
ultraviolet light, and carrying out stirring for 20-30 min; adding Na2SO3 with a
molar concentration of 0.1 mM until no bubbles are generated in the sewage; and analyzing the result, and sending the sewage into a contact disinfection tank to react the sewage with ClO2 for disinfection, and discharging the
effluent of the disinfection tank into a common
sewage treatment tank. The method provided by the invention can be used to carry out oxidative
decomposition on
drug impurities in the
wastewater of the pharmaceutical factory, pre-treat
drug wastewater and prevent environmental
pollution.