AN INVESTIGATION IN DYNAMIC PROCESSES AND ITS INFLUENCES OF IRON AND MANGANESE RELEASES FROM RESERVOIR SEDIMENT

摘要

To control the emission of iron (Fe) and manganese (Mn) from reservoir sediment, fluxes of Fe and Mn across the sediment-water interface were tested in the laboratory to study the dynamic release properties of Fe and Mn from the sediment and to investigate the influences of dissolved oxygen (DO), biological effect and light on their release processes. The results showed that dissolved Fe (DFe) in the pore water was mainly microbially caused and its release resulted from diffusion and exchange with solid phase of the top sediment. Whereas, microbes activities was not the only reason for dissolved Mn (DMn) in pore water, and its release was mainly influenced by the concentration difference between pore water and overlying water. Moreover, the release of Fe from sediment was significantly influenced by DO, biological effects, while Mn release was greatly affected by DO and temperature.