In this study, a membrane bioreactor (MBR) was used to achieve both nitrogen and carbon removal by a simultaneous partial nitrification, anammox, and denitrification (SNAD) process. During the entire experiment, the optimal operating parameters as determined by response surface methodology (RSM) were a C/N value of 1.16, a DO value of 0.84 mg·L^-1, and an aerobic time (T_ae) of 15.75 min. Under these conditions, the SNAD process achieved efficient and stable nitrogen and carbon removal; the total inorganic nitrogen (TIN) removal efficiency and chemical oxygen demand (COD) removal efficiency were 92.31% and 95.67%, respectively. With the formation of granular sludge, the membrane fouling rate (MFR) decreased significantly from 35.0 Pa·h^-1 at SNAD start-up to 19.9 Pa·h^-1 during stable operation. Fluorescence in situ hybrid (FISH) analyse confirmed the structural characteristics and the relative ratio of AerAOB, AnAOB, and DNB in the SNAD system.

This data is for Figure 1-5 , Figure 2S and Figure 3S of associated article.