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Huan Jing Ke Xue. 2018 Feb 8;39(2):865-871. doi: 10.13227/j.hjkx.201707029.

[Effect of Aeration Rate on Shortcut Nitrification Recovery in Intermittent Aeration Mode].

[Article in Chinese]

Author information

1
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
2
National Engineering Laboratory of Urban Sewage Advanced Treatment and Resource Utilization Technology, Beijing University of Technology, Beijing 100124, China.

Abstract

Shortcut nitrification sludge, which was set aside for two months, was recovered using Reactors Ⅰ, Ⅱ, Ⅲ, and Ⅳ. The aeration rates of Reactors Ⅰ, Ⅱ, Ⅲ, and Ⅳ were 120, 100, 80, and 60 L·h-1, respectively, while treating real domestic sewage, and the ratio of aerobic/anoxic was 30 min/30 min at the temperature of 25℃. The influent of ammonia was 50-80 mg·L-1, and the concentration of effluent ammonia was stable, at below 5 mg·L-1, after the 12th, 18th, 21st, and 21st cycles. The removal ratio of ammonia nitrogen was about 95%. The highest concentrations of nitrite for Reactors Ⅰ, Ⅱ, Ⅲ, and Ⅳ were 20.83, 22.81, 21.50, and 20.73 mg·L-1, respectively, which occurred in the 30th, 35th, 38th, and 42nd cycles, respectively. The concentrations of effluent nitrate were lower than 0.5 mg·L-1, and the nitrite accumulation rates were higher than 99%. The activity of ammonia-oxidizing bacteria (AOB) increased gradually and finally stabilized at 100.00%; however, the activity of nitrite-oxidizing bacteria (NOB) was gradually inhibited. The recovery of shortcut nitrification was achieved successfully in the different aeration modes.

KEYWORDS:

SBR; activity recovery; aeration rate; intermittent aeration; shortcut nitrification

PMID:
29964852
DOI:
10.13227/j.hjkx.201707029
[Indexed for MEDLINE]

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