The Correlation between Water Eutrophication and Sediment Pollution in the Process of Black Odors Water Treatment: A Case Study of the Ximing River and Keli River in Nanning, China

Abstract

AbstractWater body black odor is an extreme manifestation of water eutrophication. Phosphorus and nitrogen in sediment are important sources of water eutrophication. In order to evaluate the correlation between eutrophication degree of urban river water body and sediment pollution in the process of black and odorous water treatment in Nanning, eutrophication index method and nitrogen and phosphorus comprehensive pollution index method are used to evaluate the water body and sediment of only 15 monitoring sections in research area. The results show that after three years of treatment, there is a strong correlation between the eutrophication degree of water body and the pollution status of sediment, that is, the eutrophication of water body is mesotrophic section, the sediment is clean or slightly polluted, and the consistency between the area with severe eutrophication and the area with severe or moderate sediment pollution is 100%. On the other hand, it shows that water pollution will bring sediment pollution. With the implementation of treatment engineering measures, the improvement of water quality will also reduce sediment pollution, the water bodies of Ximing River and Keli River are mainly nitrogen pollution, but the pollution degree of Keli river is more serious than that of Ximing River. We should strengthen the treatment of nitrogen and phosphorus pollution in the Keli River. The measures include the construction of onshore rainwater run off reduction and control facilities and coastal aquatic plant planting.KeywordsBlack odors water treatmentWater etrophication index methodSediment comprehensive pollution index methodTNTP