在这项研究中,对重要财产的调查,包括水分含量,pH值,植物营养素,有机物,矿物油,以及陕西省32个城市处理厂收集的污泥(SS)中重金属(HMs)的含量,中国,进行了。试验结果表明,pH值和水分,有机物,总氮(TN),总磷(TP),SS的矿物油含量在不同的降雨时期有所不同,大部分指标均符合我国SS农业再利用的标准。主成分分析(PCA)和相关分析表明,SS的污染物特征取决于时间跨度和地理分布。铅的平均含量,Cd,Cu,Zn,Ni,Cr,Hg,和As分别比土壤背景值高3.95、16.38、5.43、7.70、1.31、1.53、32.77和1.40倍,分别。形态分析表明,SS中HMs的形态差异显著。基于地质累积指数(Igeo)的评估,内梅罗综合污染指数(NIPI),和潜在生态风险指数(RI)表明,在某些地区,HM污染风险水平未污染或中度污染,而用于农业应用的SS回收风险较低。总之,陕西省SS农业利用存在一定的潜在生态风险,在利用SS资源进行土地应用之前,必须降低HM含量。
In this study, an investigation of important properties, including moisture content, pH, plant nutrients, organic matter, mineral oil, and the contents of heavy metals (HMs) in sewage sludge (SS) collected from 32 urban treatment plants in Shaanxi Province,
China, was carried out. The test results showed that the pH and the moisture, organic matter, total nitrogen (TN), total phosphorus (TP), and mineral oil contents of the SS varied over different rainfall periods, and most of the indicators met the standard criteria for SS agricultural reuse in
China. Principal component analysis (PCA) and correlation analysis indicated that the pollutant characteristics of the SS depended on time span and geographical distribution. The mean contents of Pb, Cd, Cu, Zn, Ni, Cr, Hg, and As in SS were 3.95, 16.38, 5.43, 7.70, 1.31, 1.53, 32.77, and 1.40 times higher than the soil background values, respectively. Speciation analysis showed that the forms of HMs in the SS were significantly different. Assessments based on the geoaccumulation index (Igeo), Nemerow integrated pollution index (NIPI), and potential ecological risk index (RI) suggested that HM pollution risk levels were either uncontaminated or moderately contaminated in some regions and that SS recycled for agricultural applications carried a low risk. In conclusion, certain potential ecological risks exist for SS agricultural utilization in Shaanxi Province, and it is necessary to reduce the HM content before SS resource utilization for land application.