Effects of sludge composting products on soil and groundwater
HU Yi-shui1, QI Shi1, LI Yu-tong2, ZHOU Jin-xing1,3, WU Bing-chen1
1. School of Water and Soil Conservation, Beijing Forestry University, Beijing 100083, China; 2. Hangzhou LeadInsight Data Technology Co., Ltd., Hangzhou 310004, China; 3. Jianshui Research Station, Beijing Forestry University, Beijing 100083, China
Abstract：In order to explore the influence of applying municipal sludge composting products in Beijing for soil and ground water, the migration and leaching characteristics of eight heavy metals elements (Cu, Cr, Ni, Zn, Pb, Cd, As and Hg) were studied under the conditions of 3, 6, 12kg/m2 composting products added in soil and rain simulating by means of undisturbed soil column experiment. The results showed that Cd remained least (6.1%~11.9%) and leached most (4.5%~7.3%), while Hg remained most (16.0%~22.1%) and leached least (<0.1%). Most Hg, Pb, Ni, Cd and Cu accumulated in the top soil layer (52.0%~78.7%), while most Cr, Zn and As accumulated in the middle layer(42.7%~53.2%).The contents of eight elements in soil all met the national regulation (GB 15618-2018). The concentrations of the six measured elements were in descending order Zn > As > Cd > Cu > Pb > Cr. The relationship among the concentrations and amounts of compost applied and water volume was discussed. According to national regulation (GB/T 14848-2017), the concentrations of Cu, Cr, Ni, Zn and Pb in lechate were always within the range of Class I, while Cd, As and Hg were within the range of Class III.
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