The soil for landscaping and greening is one of the main ways for the resource utilization of urban lake sediment in cities at present.However,the potential environmental pollution risks cannot be ignored during the resource utilization process.Therefore,understanding characteristics of sediment in urban lakes are the foundation for achieving resource utilization.Selecting the dredged sediment from Gantang Lake and Nanmen Lake in Jiujiang City,Jiangxi Province,as the research objects,we tested physical and chemical properties,nutritional fertility indicators,heavy metal contents and polycyclic aromatic hydrocarbons,and systematically analyzed the characteristics of urban lake sediment and explored feasibility of resource utilization.The results showed that the average organic matter content in the dredged sediment in urban lakes was 45.5 g/kg,pH was 5.7,the average content of hydrolyzable nitrogen was 130.7 mg/kg,the average content of available phosphorus was 62.6 mg/kg,and the average content of available potassium was 248.7 mg/kg.The basic physical and chemical properties and nutritional fertility indicators met the requirements of Planting Soil for Greening(CJ/T 340-2016).The typical pollution factors such as heavy metals and polycy-clic aromatic hydrocarbons were within the range of relevant standard requirements of Planting Soil for Greening(CJ/T 340-2016)and Soil Environmental Quality-Risk Control Standard for Soil Contamination of Development Land(GB 36600-2018).We calculated the cost of using dredged sediment to prepare green planting soil for greening projects,which could reduce the cost by 30.5%compared to purchasing planting soil.In summary,urban lake sediments with high nutrient content and low heavy metal pollution can be further processed and used for landscaping and planting soil preparation,which has great potential for resource u-tilization.The research results can provide data support and reference for the treatment and disposal of urban lake sediment in cit-ies with common characteristics,as well as the selection of soil for urban construction.
关键词
疏浚底泥/泥质特性/城市内湖/资源化利用/重金属污染/多环芳烃/甘棠湖/南门湖
Key words
dredged sediment/sediment characteristics/urban lake/resource utilization/heavy metal pollution/polycyclic aromatic hydrocarbon/Gantang Lake/Nanmen Lake
维普
万方数据