Author(s): Shiquan Sun; Changbo Jiang; Yuan Qiu; Zhao Gang
Linked Author(s):
Keywords: Dong dongtinghu lake; Sediments; In-situ control; Phosphorus release
Abstract: Taking Dong dongting Lake sediments as the research object. The effects of phophorus concentrat- ion and water quality of overlying water under In-situ control techology, including zeolite capping, calcium nitrate in-situ treatment and aeration, were analyzed, by laboratory simulation. The effects of the control of phosphorus concentration in overlying water in aerobic environment was very badly, when the dissolved oxygen saturation more than 20% , the concentration of phosphorus did not be changed in water, and the effects of control was followed by calcium nitrate in-situ treatment＞zeolite capping＞aeration≥untreated; When under anaerobic condition, the effects of contral was followed by calcium nitrate in-situ treatment > aeration＞zeolite capping > untreated; Under the hydrodynamic condition, the effects of control was followed by calcium nitrate in-situ treatment＞zeolite capping＞ aeration＞untreated, however, under different of hydrodynamic condition, the stability of phosphorus concentration to maintain in overlying water under zeolite capping was better than calcium nitrate in-situ treatment; Zeolite capping and calcium nitrate in-situ treatment were increased the oxygen consumption in water, and calcium nitrate in-situ treatment was the most significantly, and it was made the water lose reoxygenation function.
Year: 2013