Study on Ecological Risk of Dredged Sediment in Urban River Wetland

Fushan Zheng, Tiantian Chen, Mingjuan Bi, Hongxia Dong

Laiwu Vocational and Technical College, Laiwu, 271100, China

Abstract: More and more people pay attention to the coordinated development of ecological environment and social economy due to the release of the concept of green and environmental protection city. River water quality is seriously polluted, and sediment becomes the gathering place of pollutants. Therefore, a detailed study on ecological risk of dredged sediment in urban river wetland was carried out. By analyzing the content of heavy metal ions in dredging project, it is proposed that dredged sediment has the risk of heavy metal pol-lutants to the ecological environment, and the nutrient salt remaining in dredged sediment is also a key factor to inhibit the sustainable development of ecological environment. In this state, microorganisms are endan-gered, which may seem to have no too much influence in the short term, but the long-term development will cause the fracture of biological chain, which will damage the ecological system of urban river wetland. In ad-dition, the substances produced by sediment through physical and chemical action have seriously damaged the water quality of the wetland, and the interactions of pollutants such as sediment, bacteria and heavy metals have caused a very bad ecological cycle.

Keywords: Urban river wetland; Dredging; Residual sediment; Ecological risk