Simulated Study On Migration And Transformation Of Phosphorus Of Water-sediment Interface

Eutrophication is one of the main problems of the water pollution, which imperils thewater resource on our earth. Phosphorus is the key factor for eutrophication. However,microorganisms in the sediment, as the major executors of cycling in nature, play importantroles in the phosphorus cycling between water and its sediment which eutrophicated.In different seasons in taihu lake Eutrophication degree area of three different samplingsites of surface sediment samples were studied. The results showed that,(1) The phosphorus concentration from sediment into overly water was basiclyunder the natural state. The phosphorus concentration from sediment into overly waterunder sediment Sterilization system was greater than no sediment sterilization system.(2) Thebehavior of phosphorus release may be associated with the activity of microorganism,28℃and38℃are more suitable for microbial growth, so the microbial activity is strong. Microbialactivity to a certain extent, affected the release of phosphorus concentration from sedimentinto overly water. Different temperature has no obvious influence on the water pH value.(3)the phosphorus concentration of the analog systems under alkaline conditions from sedimentinto overly water is greater than the acidic conditions and the neutral conditions. Water pH toa certain extent changed the release of phosphorus concentration from sediment into overlywater, higher water pH value is beneficial to the release of phosphorus in sediment.(4) Thephosphorus concentration from sediment into overly wate under the condition of high salinitywater is higher than the lower salinity conditions. Different salinity has no obvious influenceon the water pH value.(5) Through the analysis of Virgin7.5software, analog systems withand without access phosphorus-accumulating bacteria phosphorus release from the sedimentis significant difference, under the action of phosphorus-accumulating bacteria the sedimentsphosphorus release was significantly higher than without access phosphate accumulatingbacteria. Analog systems with and without access phosphorus-accumulating bacteria has noobvious influence on the pH value of the overlying water.(6) Through the analysis of Virgin7.5software, analog systems with and without access phosphate-solubilizing microorganismsphosphorus release from the sediment is significant difference, under the action ofphosphate-solubilizing microorganisms the sediments phosphorus release was significantly higher than without access phosphate accumulating bacteria. Analog systems with andwithout access phosphate-solubilizing microorganisms has no obvious influence on the pHvalue of the overlying water.