城市内湖底泥特性及资源化利用分析  

Analysis on characteristics and resource utilization potential of sediments in urban lakes

作　　者：黄嘉良 方宁 郭亚丽 李文浩 次瀚林 郭林松 HUANG Jialiang;FANG Ning;GUO Yali;LI Wenhao;CI Hanlin;GUO Linsong(China Three Gorges Corporation,Wuhan 430010,China;Shanghai Investigation,Design&Research Institute Co.,Ltd.,Shanghai 200434,China)

机构地区：[1]中国长江三峡集团有限公司,湖北武汉430010 [2]上海勘测设计研究院有限公司,上海200434

出　　处：《人民长江》2024年第10期94-100,共7页Yangtze River

基　　金：国家重点研发计划项目(2020YFC1908700);上海勘测设计研究院有限公司科标业项目(2023HJ(83)-011,2023HJ(83)-012)。

摘　　要：当前园林绿化用土是城市内湖底泥资源化利用的主要途径之一,但资源化利用过程中可能存在的环境污染风险问题不容忽视,因此了解底泥特性是指导其资源化利用途径的基础。以江西省九江市甘棠湖、南门湖疏浚底泥为研究对象,检测疏浚底泥的基本理化性质、营养肥力指标、重金属含量及多环芳烃含量,系统分析其底泥特性并探究其资源化利用方式的匹配性。结果表明:内湖疏浚底泥的有机质平均含量为45.5 g/kg,pH为5.7,水解性氮平均含量为130.7 mg/kg,有效磷平均含量为62.6 mg/kg,速效钾平均含量为248.7 mg/kg,基本理化性质及营养肥力指标均满足CJ/T340-2016《绿化种植土壤》要求,同时重金属、多环芳烃等典型污染因子在CJ/T340-2016《绿化种植土壤》、GB36600-2018《土壤环境质量建设用地土壤污染风险管控标准》要求范围内。相比采购种植土,利用疏浚底泥制备绿化种植土用于绿化工程的成本,显著降低30.5%。综上所述,针对养分含量高、重金属污染程度低的城市内湖底泥,经进一步处理后可用于园林绿化及种植土制备,其资源化利用潜力较大。研究成果可为城市内湖底泥处理处置去向及城市建设用土选择提供数据支撑和参考。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 polycyclic 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 utilization.The research results can provide data support and reference for the treatment and disposal of urban lake sediment in cities with common characteristics,as well

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 

分 类 号：TU986[建筑科学—城市规划与设计] X703[环境科学与工程—环境工程]