低剂量长波紫外胁迫下活性污泥硝化活性及氧化应激响应

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Abstract The effect of illumination intensity (0, 0.15, 0.39, 0.62 and 1.16μE/(L·s)) and duration (0, 1, 2, 3 and 4h) of UVA on the activities of ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) were investigated in well-performed nitrifying activated sludge. The results showed UVA irradiation significantly reduced activity of NOB (P < 0.01), while effect of UVA on AOB was insignificant (P > 0.05). AOB activity and NOB activity showed more significant difference as UVA irradiation prolonged. Dynamics modelling indicated that the decay rate of NOB (b=0.6938h^-1) was much higher than that of AOB (b=0.1423h^-1) under UVA, which implied that NOB was rather intolerant to UVA compared with AOB. The difference between AOB and NOB activities under UVA irradiation may associated with the oxidative stress effect induced by UVA, which would dramatically increase the level of intracellular reactive oxygen species (ROS), and thus damage the cell membrane, destroy the structural integrity of cell, and cause the cell decay.

Key words： ultraviolet-A activated sludge nitritation decay rate oxidative stress

Received: 06 May 2021

PACS:

X703.5

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	Articles by authors
	HUANG Xiao-yu
	CHU Zhao-rui
	RONG Hong-wei
	HE Jian-feng
	HUANG Dan-dan
	WANG Zhi-hui
	LAI Guo-wang

Cite this article:

HUANG Xiao-yu,CHU Zhao-rui,RONG Hong-wei等. Effect of low-dose ultraviolet-A (UVA) irradiation on nitrification activity of activated sludge and oxidative stress response[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5613-5619.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I12/5613

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