Phosphorus Removal Performance in EBPR System under Extra-low Dissolved Oxygen Condition

• Published in: Huanjing kexue Vol. 37; no. 8; p. 3128
• Main Authors: Ma, Juan, Song, Lu, Yu, Xiao-Jun, Li, Lu, Sun, Lei-Jun, Sun, Hong-Wei, Li, Guang-Yin
• Format: Journal Article
• Language: Chinese
• Published: China 08.08.2016
• Subjects: dissolved oxygen; anaerobic; aeration; ratio of phosphorus uptake rate; enhanced biological phosphorus removal(EBPR)
• ISSN: 0250-3301
• DOI: 10.13277/j.hjkx.2016.08.039

Two sequencing batch reactors (SBRs) were operated with alternating anaerobic/oxic (An/O) for 127 days to study the phosphorus removal efficiency and process performance of the EBPR under different dissolved oxygen gradient. For the reactor (R ) in which DO was not controlled and measured as high as 6 mg·L during the aerobic stage, a stable phosphorus removal performance was achieved in the former 65 days during the operational period. The phosphorus removal efficiency was greater than 95.9% and the total phosphorus in effluent was less than 0.5 mg·L . However, the phosphorus removal performance subsequently deteriorated after 65 days and completely broke up until 97 day due to long-term excessive aeration. Throughout the operational period,only 39.4% of effluent TP met the national wastewater discharge standard A. For the test reactor (R ) in which DO was controlled at the levels of 2, 1, 0.5, 0.2, 0.1 mg·L during the aerobic stage, respectively, the phosphorus removal performance showed a slight fluctuation