State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China; School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China; Department of Biological System Engineering, Virginia Polytechnic Institute and State University, Virginia Beach 23455, United States.
State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China; School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China.
J Environ Sci (China). 2020 Apr;90:331-342. doi: 10.1016/j.jes.2019.11.022. Epub 2019 Dec 24.
Nitrogen in pond sediments is a major water quality concern and can impact the productivity of aquaculture. Dissolved oxygen is an important factor for improving water quality and boosting fish growth in aquaculture ponds, and plays an important role in the conversion of ammonium-nitrogen (NH-N) to nitrite-nitrogen (NO-N) and eventually nitrate-nitrogen (NO-N). A central goal of the study was to identify the best aeration method and strategy for improving water quality in aquaculture ponds. We conducted an experiment with six tanks, each with a different aeration mode to simulate the behavior of aquaculture ponds. The results show that a 36 hr aeration interval (T = 36 hr: 36 hr) and no aeration resulted in high concentrations of NH-N in the water column. Using a 12 hr interval time (T = 12 hr: 12 hr) resulted in higher NO-N and NO-N concentrations than any other aeration mode. Results from an 8 hr interval time (T = 8 hr: 8 hr) and 24 hr interval time (T = 24 hr: 24 hr) were comparable with those of continuous aeration, and had the benefit of being in use for only half of the time, consequently reducing energy consumption.
池塘沉积物中的氮是一个主要的水质问题，会影响水产养殖的生产力。溶解氧是改善水产养殖池塘水质和促进鱼类生长的重要因素，在氨氮（NH-N）向亚硝酸盐氮（NO-N）和硝酸盐氮（NO-N）的转化中起着重要作用。本研究的一个中心目标是确定改善水产养殖池塘水质的最佳曝气方法和策略。我们进行了一项有六个水箱的实验，每个水箱采用不同的曝气方式来模拟水产养殖池塘的行为。结果表明，36 小时的曝气间隔（T=36 小时：36 小时）和不曝气会导致水柱中 NH-N 的浓度很高。采用 12 小时的间隔时间（T=12 小时：12 小时）会导致 NO-N 和 NO-N 的浓度高于任何其他曝气方式。8 小时间隔时间（T=8 小时：8 小时）和 24 小时间隔时间（T=24 小时：24 小时）的结果与连续曝气的结果相当，并且只需使用一半的时间，因此减少了能源消耗。
