Environmental Sanitation Engineering ›› 2025, Vol. 33 ›› Issue (2): 50-54.doi: 10.19841/j.cnki.hjwsgc.2025.02.007

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Occurrence Characteristic and Risk Assessment of Heavy Metals in Yangzhou Household Food Waste

XIA Qing, XU Xiaojian, ZHANG Yuting, ZHOU Chengya, LIU Haichun   

  1. 1. Yangzhou Environmental Monitoring Center of Jiangsu Province; 2. College of Biological and Chemical Engineering, Yangzhou Polytechnic University
  • Online:2025-04-28 Published:2025-03-04

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Abstract: 　Taking the household food waste in five residential areas in different districts of Yangzhou(Guangling district, Hanjiang district and Jiangdu district) within one year as the objects, the concentration of heavy metals (As， Cd，Cu， Ni， Pb， Zn) in food waste was analyzed. Meanwhile, the applicability of food waste as composting raw material was researched and pollution risk assessment of heavy metals was carried out. The results showed that the concentration of Ni, Cd, Pb, As were relatively low, while the concentration of Cu and Zn were relatively high, with the maximum values of 6.35， 0.68， 2.81， 0.49， 26.1， 58.2 mg/kg, respectively. Through comparative analysis, the concentration of As, Pb and Cd in food waste were far lower than the limit of NY/T 525—2021 Organic Fertilizer, and the concentration of Pb, Cd, Ni, Cu, As were also much lower than the soil pollution risk screening value of the second type of land in GB 36600—2018 Soil Environmental Quality-Risk Control Standard for Soil Contamination of Development Land, which indicated that the food waste in Yangzhou would be suitable for composting raw material. According to the Hakanson potential ecological risk index method, the potential ecological risk index RI of heavy metals in food waste was calculated to be 0.45, indicating that the potential ecological risk caused by Cd, As, Pb, Cu and Ni of household food waste was low, and the organic fertilizer obtained by household food waste as compost raw materials would be safe to be applied to landscaping.

Key words: household food waste, heavy metal, resource utilization, ecological risk assessment

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