Comparative study of low carbon source wastewater treatment by hydrolysis acidification/anoxic moving biological biofilm reactor/aerobic process and conventional anoxic/aerobic process

Key words: 
• low C/N ratio /
• sewage wastewater /
• nitrogen removal /
• H/AMBBR/O

Abstract: The hydrolysis acidification (H)/anoxic moving biological biofilm reactor (AMBBR)/aerobic (O) process was employed to improve the content of easily biodegradable organisms in low carbon source wastewater, and it was compared with the conventional anoxic (A)/aerobic (O) process, to see its feasibility in nitrogen removal of low carbon source wastewater. Denitrification performance of both sludge from the two processes were investigated at low temperatures（10.9~13℃）, and the laboratory pilot scale operation of the two processes were also studied. Results from bench scale test show that the nitrate removal efficiency of two-phase sludge from AMBBR was 19.4% higher than that of single anoxic sludge. Also, results from pilot scale test showed that under the same conditions, the removal efficiencies of COD and ammonia were almost the same in both process, while total nitrogen removal efficiency in H/AMBBR/O process was always higher than that of A/O process, and the D-value attains 22.39% under their best conditions. Besides, in the process of H/AMBBR/O, sludge reduction was realized through backflow hydrolysis. It was believed that the H/AMBBR/O process could improve carbon source effectively, especially in warm areas.