Impacts of different aerating methods on dissolved oxygen in brackish water and reclaimed water
OUYANG Zan1, TIAN Juncang1,2,3*, DENG Huiling1, YAN Xinfang1,2,3
1. School of Civil Engineering and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China; 2. Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation, Yinchuan, Ningxia 750021, China; 3. Engineering Research Center for Efficient Utilization of Water Resources in Modern Agricultural in Arid Regions, Ministry of Education, Yinchuan, Ningxia 750021, China
Abstract：The relationships of dissolved oxygen in brackish water and reclaimed water with time and temperature were clarifed experimentally to find out the best aerating method. In experiment design, eight treatments were assigned, namely micro-nano bubble generating device(F1), 12 gas stone fired oxygen pump(F2), 28 gas stone fired oxygen pump(F3), Venturi(F4), Venturi+12 gas stone fired oxygen pump(F5), Venturi+28 gas stone fired oxygen pump(F6), micro-nano bubble generating device+12 gas stone fired oxygen pump(F7), micro-nano bubble generating device+28 gas stone fired oxygen pump(F8)at 20 ℃ water temperature, and seven temperatures(F9)such as 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃ and 45 ℃ as well as brackish water(W1)and reclaimed water(W2)were applied in oxygen dissolving. The results show that the dissolved oxygen increases by 59.65%, 53.10%, 44.43% and 39.47% in treatments F3W1, F1W1, F2W1 and F4W1, respectively compared with CKW1. Compared with CKW2, fortunately, the dissolved oxygen rises by 80.17%, 78.04%, 60.13% and 55.22% in F3W2, F1W2, F2W2 and F4W2, respectively. Based on CKW1, the dissolved oxygen increases by 73.98% and 67.79% in F8W1 and F7W1, respectively; Interestingly, in terms of CKW2, the dissolved oxygen is ascended by 100.21% and 94.67% in F8W2 and F7W2, respectively. Unfortunately, compared with CKW1, the dissolved oxygen is increased by 63.84% and 57.44% in F6W1 and F5W1, respectively. Simiarly, compared with CKW2, the oxygen is increased by 0, 79.45% and 73.79% in F6W2 and F5W2, respectively. Finally, compared with CKW1, when the water temperature rises from 15 ℃ to 45 ℃ the dissolved oxygen in F9W1 is decreased by 0, 9.82%, 12.86%, 14.86%, 26.56%, 29.43% and 34.24%, respectively. In parallel, compared with CKW2, temperature rise in F9W2 leads to an increase in the dissolved oxygen by 0, 15.32%, 15.69%, 19.24%, 23.65%, 25.59% and 32.55%, respectively. In terms of the maximum dissolved oxygen, the best aerating method is the case: micro-nano bubble generating device+28 gas stone fired oxygen pump(F8W1 9.83 mg/L, F8W2 9.39 mg/L).
欧阳赞, 田军仓,,*, 邓慧玲, 闫新房,,. 不同加气方式对微咸水和中水溶解氧的影响[J]. 排灌机械工程学报, 2019, 37(9): 806-814.
OUYANG Zan, TIAN Juncang,,*, DENG Huiling, YAN Xinfang,,. Impacts of different aerating methods on dissolved oxygen in brackish water and reclaimed water. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(9): 806-814.
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