光照、流速和水温对大型人工输水渠道自净影响

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Abstract Taking the main channel of the middle route of the South-to-North Water Diversion Project as the object, the degradation coefficients were measured through laboratory culture experiments, and the effects of light, flow rate and temperature on the self-purification capacity of the channel were analyzed. The results showed that the degradation coefficients of permanganate index under dark and light were 0.026d^-1 and 0.022d^-1, respectively, with no significant difference (P>0.05). The degradation coefficients of ammonia nitrogen under dark and light were 0.006d^-1 and 0.012d^-1, respectively, and the difference was extremely significant (P<0.01). Under different flow rates, the degradation coefficients of permanganate index were 0.027d^-1 (0.2m/s), 0.029d^-1 (0.3m/s), 0.029d^-1 (0.4m/s), and the degradation coefficients of ammonia nitrogen were 0.014d^-1 (0.2m/s), 0.017d^-1 (0.3m/s), 0.018d^-1 (0.4m/s), respectively. There was no significant difference between different flow rates, but they were significantly higher than the 0m/s group. Under different temperatures, the degradation coefficients of permanganate index were 0.014d^-1 (10℃), 0.018d^-1 (15℃), 0.022d^-1 (20℃), 0.029d^-1 (25℃) and 0.031d^-1 (30℃), respectively. There was no significant difference between 25℃ and 30℃ (P>0.05), and there were significant differences among other temperatures. The degradation coefficients of ammonia nitrogen were 0.002d^-1 (10℃), 0.003d^-1 (15℃), 0.010d^-1 (20℃), 0.012d^-1 (25℃) and 0.020d^-1 (30℃), respectively. There were no significant differences for 10~15℃, 15~20℃ and 20~25℃, and there were significant differences for other temperature gradients. The temperature correction factor θ of permanganate index and ammonia nitrogen were 1.047 and 1.079, respectively. The research results could provide a basis for water quality management of the middle route of the South-to-North Water Diversion Project.

Key words： large artificial water conveyance channels self-purification degradation coefficient influencing factors South-to-North Water Diversion Project

Received: 22 February 2021

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	WANG Chao
	JIA Qing-lin
	JIA Hai-yan
	LI Chao
	YIN Wei

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WANG Chao,JIA Qing-lin,JIA Hai-yan等. Influence of light, flow rate and water temperature on self-purification of large artificial water conveyance channels[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4792-4801.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4792

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