The invention discloses a method for synchronously removing
nitrogen and
phosphorus in
sewage containing
nitrogen and
phosphorus, belonging to the field of
sewage treatment. The method comprises the steps of (1) screening
thiobacillus denitrificans: screening
thiobacillus denitrificans from anaerobic
activated sludge and taking as target strain, wherein
thiobacillus denitrificans utilizes sulphur source in
ferrous sulfide to conduct autotrophic
denitrification; (2) preparing fillers of a reactor: directly adding
ferrous sulfide with the particle size smaller than 25mm in a reaction container; (3) adding
sewage: feeding sewage to be treated into the reaction container, wherein the sewage to be treated is the sewage containing
nitrogen and
phosphorus with the pH value of 5.0-9.0; (4) conducting the autotrophic
denitrification process: conducting the mixed reaction for 2 to 6d at the temperature of 10 DEG C-40 DEG C under the anaerobic condition in the reaction container, reducing NO2<-> and NO3<-> in water to be N2 by
thiobacillus denitrificans while simultaneously oxidizing
ferrous sulfide by
thiobacillus denitrificans, and simultaneously, precipitating phosphorus in water by utilizing iron ions (being oxidation products); and (5) separating
solid and liquid. According to the method, the technology for removing nitrogen by utilizing
thiobacillus denitrificans and the technology for removing phosphorus by using iron ions are fused naturally, the reaction cost is low, and the
processing effect is good.