Engineering application on the combination of simultaneous partial nitrification and denitrification and anammox for advanced nitrogen removal from landfill leachate

The engineering application of continuous-flow process for advanced nitrogen removal from landfill leachate via anammox is at the forefront of landfill leachate treatment field. For the full-scale engineering renovation, the anaerobic + pre-aeration + anammox + MBR process was constructed for advanced nitrogen removal from landfill leachate of 150 m3/d. Under the strategy of aeration control and low reflux ratio, a stable operation of simultaneous partial nitrification and denitrification (SPND) and anammox was achieved. Without carbon sources addition, the nitrogen removal efficiency reached 94.07 +/- 1.26 %, of which the nitrogen removal contribution of the SPND and anammox process reached 64.12 +/- 0.92 % and 26.46 +/- 1.10 %, respectively. The anammox bacteria mainly enriched in sponge biofilm and floc sludge with abundant reached 2.57 % and 2.17 %, respectively. Compared with the original process, the renovated process could significantly save 18.51 % of the treatment consumption. This study provided a practical and feasible approach for the renovation of the existing treatment process.