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Abstract ▼ AI-Helper

In order to investigate the effects of sediments on the quality of a small-sized reservoir, Heung-Bu reservoir located at Si-heung City, the physical and chemical characteristics of sediments, sediment oxygen demand(SOD), and nutrients release rate from sediments were estimated. The deepest site was...

In order to investigate the effects of sediments on the quality of a small-sized reservoir, Heung-Bu reservoir located at Si-heung City, the physical and chemical characteristics of sediments, sediment oxygen demand(SOD), and nutrients release rate from sediments were estimated. The deepest site was more polluted than the others because of constant sedimentation of pollutants. The amount of degradable organic pollutants in sediments was indirectly measured by SOD. SOD was the highest value at the site adjacent to the influent. There was no significant relationship between SOD and the concentration of organics estimated by loss on ignition(p=0.136). It indicates that SOD reflects the concentration of organics which easily degradable. Phosphorus was not released significantly in the nutrient-releasing experiments, because the concentration of this was not high in the sediments of the reservoir. In case of nitrogen, it was released rapidly at the earlier stage. rho concentration of nitrogen in the water column was decreased, however, at the end of experiments. The nitrogen releasing rate was estimated to 42.1kg-N/day based on the rate measured at the early stage, which was almost same with the load from the influent, 52.7kg-N/day. It indicated that the releasing of nitrogen from sediment plays an important role in the pollution of the investigated reservoir.

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