Research On Mathematical Modeling Of Heavy Metal In Tidal Netword Region

With the development of industry, especially the augment of metal smelt plants, electroplating, elctron and chemical industries, a great deal of heavy metal wastewater was discharged into water body in increasing amounts. Because of the strong toxicity, complex pollution characters and non-bidegradation, heavy mental pollutant is great harm to hydrophilous propagation and people healthy. Some researches about heavy metal pollution in water have been done formerly, but there are few about river network regions, which is with the characteristics of dense rivers and pollutant originated from point sources. Therefore it's important to enhance the studies about transport and transformation rules of heavy mental pollutant in water in these regions.Pollution characteristics and transport and transformation rules of heavy metal pollutants were analyzed systemically at first. Taicang city zone and nearby rivers was chosen as the research objection. Heavy metal emission is large in this region, where is typical tidal river network due to the characteristics of interleaving rivers, slow velocity of flow and inconstant direction of flowing water. Through the investigation of the current situation of heavy metal pollution in this region and strict selection, Cr6+ was decided as the pollutional factor. Aiming at local hydrological feature, the problem of transport and transformation of heavy metal in river network regions through mathematical modeling at the first time. Establishing modeling of heavy metal transport and transformation, dissolved heavy metal was the main research goal and the synthetically sedimentation coefficient was imported to investigate the migration of heavy metal between aquatic phase and sedimental phase. According to calculating results, mechanism of transport and transformation of heavy metal has been analyzed, and adsorption sedimentation has been considered as the main aspect. The influencing factors was discussed and the direction and approaches about future work were also confirmed.