ZHANYong,CAORun-qin,XUJing-jing,et al.Ecological Risk Assessment of Heavy Metals and Polycyclic Aromatic Hydrocarbons in Printing and Dyeing Sludge[J].China Water & Wastewater,2025,41(13):119-125.
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Ecological Risk Assessment of Heavy Metals and Polycyclic Aromatic Hydrocarbons in Printing and Dyeing Sludge

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第13期 Page: 119-125 Column: Date of publication: 2025-07-01
Author(s):
ZHAN　Yong1;  CAO　Run-qin1;  XU　Jing-jing1;  WANG　Yuan-hang2;  WANG　Hui3;  YANG　Chao-qi1;  ZHU　Li-ming2;  DONG　Bin3
（1. School of Environment and Architecture， University of Shanghai for Science and Technology，Shanghai 200093， China； 2. China Construction Third Bureau First Construction Engineering Co. Ltd.， Wuhan 430040， China； 3. School of Environmental Science and Engineering， Tongji University， Shanghai 200092， China）
Keywords:
printing and dyeing sludge;  heavy metal;  polycyclic aromatic hydrocarbon;  risk assessment
Abstract:
There are significant concerns regarding excessive pollutants such as heavy metals and polycyclic aromatic hydrocarbons (PAHs) in printing and dyeing sludge. To elucidate the ecological risks associated with heavy metals and PAHs in sludge that has undergone long-term mineralization in a landfill, mineralized sludge samples were collected from 10 sampling points at a printing and dyeing sludge landfill in Suzhou, and the current status and potential ecological risks of heavy metal pollution was evaluated using several pollution indicators, including ground accumulation index (Igeo), individual potential ecological risk index (Eir), pollution load index (PLI) and potential ecological risk index (RI). According to the Igeo results, multiple sites exhibited moderate pollution levels for heavy metals zinc (Zn, 3.45) and mercury (Hg, 3.48). These elements are potential toxic pollutants associated with a relatively high degree of contamination. The highest value of Eir?was observed for Hg (302.93), indicating a significant single-potential risk and substantial pollution. The PLI analysis revealed that the PLI values at points of SZ3, SZ6, and SZ7 exceeded 6, signifying severe pollution levels. Furthermore, the RI results demonstrated that points of SZ3 (2 398.78), SZ4 (402.60), and SZ6 (521.33) were at relatively high risk levels, with mercury (Hg) being the predominant heavy metal contributing to the pollution. The heavy metals in landfill sludge are typically present at a moderate pollution level, posing a relatively high potential ecological risk. Notably, it is crucial to emphasize that both Hg and Zn are toxic to the human body. Considering the carcinogenic and toxic effects of PAHs on human health and the ecological environment, the distribution characteristics and potential ecological risks of PAHs were analyzed based on sediment quality guidelines. The results indicated that the biotoxic side effects of PAHs in the landfill sludge were not significant, suggesting a relatively low overall ecological risk. However, the concentration of certain PAH monomers was relatively high at specific sampling points, which may pose a threat to organisms upon exposure and warrants further attention.
Last Update: 2025-07-01