Effect of Substances Released from Sediment on Artificial Instream Aeration
Artificial instream aeration is an economical method to increase river dissolved oxygen content and to improve water quality in rivers. However, there were unsteady aeration effects when sediment disturbed by the aeration flow. In order to investigate the effect of sediment disturbed on artificial instream aeration efficiency, artificial aeration tests in clearance bubble form were carried out at laboratory. The test results show the dissolved oxygen consumed by the sediment could be ignored for the aeration tests in which sediment do not be disturbed and the dissolved oxygen raised and the chemical oxygen demand dropped obviously after the aeration stopped. If sediment is observably disturbed in the aeration tests, a lot of suspended solid get into waters from the sediment and the aeration efficiency decrease with increase of suspended solid content in the waters. And after the aeration stopped, dissolved oxygen in the waters decreases rapidly with time in exponential form due to the oxygen demand of inorganic reduction substances in suspended solid. It is recognized by the test that the instream aeration forms not to disturb sediment are suitable for the natural rivers with thicker sediment.
Artificial Instream Aeration Sediment dissolved ozygen tes t at laboratory ozygen-depletion substance
Xu Xiangyang Xu Ying
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Educa
国际会议
上海
英文
3563-3565
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）