Abstract: Aiming at the problem of groudwater pollution caused by trinitrogenous compound antibiotics(NH⁺₄N,NO^-₂N,NO^-₃-N)  in agricultural areas of China, the effects of sulfanilamide degrading bacteria on the degradation of trinitrogen by nitrogen bacteria in the process of microbial remediation was studied by experimental simulation. The results show that sulfanilamide de
grading bacteria promote the degradation of NH⁺₄-N and NH⁺₂-N, and inhibit the growth of nitrogen bacteria and the degradation of NH⁺₃-N. Sulfanilamide degrading bacteria are bacilli, belonging to Grampositive bacteria and the nitrogen bacteria are cocci and bacilli, belonging to Gramnegative bacteria, indiciting that sulfanilamide degrading bacteria can promote nitrification and inhibit denitrification.

Key words: combined polluted groundwater, sulfanilamide degrading bacteria, nitrogen bacteria, degradation effect