Influence of light, flow rate and water temperature on self-purification of large artificial water conveyance channels
WANG Chao1,2, JIA Qing-lin1,3, JIA Hai-yan1,2, LI Chao1,2, YIN Wei1,2
1. Changjiang Water Resources Protection Institute, Wuhan 430051, China; 2. Key Laboratory of Ecological Regulation of Non-point Source Pollution in Lake and Reservoir Water Sources, Changjiang Water Resources Commission, Wuhan 430051, China; 3. College of Environment, Hohai University, Nanjing 210098, China
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.
王超, 贾庆林, 贾海燕, 李超, 尹炜. 光照、流速和水温对大型人工输水渠道自净影响[J]. 中国环境科学, 2021, 41(10): 4792-4801.
WANG Chao, JIA Qing-lin, JIA Hai-yan, LI Chao, YIN Wei. Influence of light, flow rate and water temperature on self-purification of large artificial water conveyance channels. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4792-4801.
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