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Leaching Characteristics of Heavy Metals and Plant Nutrients in the Sewage Sludge Immobilized by Composite Phosphorus-Bearing Materials

Author

Listed:
  • Shihe Li

    (College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan 250353, China)

  • Baihui Fang

    (College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan 250353, China)

  • Dongfang Wang

    (Jinan Zhongqian Environmental Protection and Energy Saving Technology Co., Ltd., Ji’nan 250100, China)

  • Xianqing Wang

    (Shandong Kanghui Technology Co., Ltd., Ji’nan 250101, China)

  • Xiaobing Man

    (Shandong Bluetown Anal & Testing Ltd., Ji’nan 250101, China)

  • Xuan Zhang

    (College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan 250353, China)

Abstract

In order to evaluate the environmental risk caused by land application of sewage sludge, leaching characteristics of heavy metals and plant nutrients in the sewage sludge immobilized by composite phosphorus-bearing materials were investigated. Their cumulative release characteristics were confirmed. Furthermore, the first-order kinetics equation, modified Elovich equation, double-constant equation, and parabolic equation were used to explore dynamic models of release. Results showed that sewage sludge addition significantly increased electricity conductivity (EC) in leachates, and the concentrations of heavy metals (Cu, Cr, Zn) and plant nutrients (N, P, K) were also obviously increased. The highest concentrations of Cu, Cr, and Zn in the leachates were all below the limit values of the fourth level in the Chinese national standard for groundwater quality (GB/T14848-2017). The immobilization of composite phosphorus-bearing materials reduced the release of Cu and Cr, while increased that of Zn. The fitting results of modified Elovich model and double-constant model were in good agreement with the leaching process of heavy metals and plant nutrients, indicating their release process in soil under simulated leaching conditions was not a simple first-order reaction, but a complex heterogeneous diffusion process controlled by multifactor.

Suggested Citation

  • Shihe Li & Baihui Fang & Dongfang Wang & Xianqing Wang & Xiaobing Man & Xuan Zhang, 2019. "Leaching Characteristics of Heavy Metals and Plant Nutrients in the Sewage Sludge Immobilized by Composite Phosphorus-Bearing Materials," IJERPH, MDPI, vol. 16(24), pages 1-18, December.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:24:p:5159-:d:298906
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    References listed on IDEAS

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    1. Morteza Feizi & Mohsen Jalali & Gianacrlo Renella, 2019. "Assessment of nutrient and heavy metal content and speciation in sewage sludge from different locations in Iran," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 95(3), pages 657-675, February.
    2. Dong-Fang Wang & Shi-He Li & Xian-Qing Wang & Ling-Xu Li & Xuan Zhang, 2018. "Synergistic Passivation of Fly Ash and TMT on Heavy Metals in Sewage Sludge," Sustainability, MDPI, vol. 10(12), pages 1-17, December.
    3. Xuan Zhang & Xian-qing Wang & Dong-fang Wang, 2017. "Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review," Sustainability, MDPI, vol. 9(11), pages 1-19, November.
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    Cited by:

    1. Hongyan Zhu & Jinbo Xu & Beibei Zhou & Jia Ren & Qiang Yang & Zhe Wang & Weibo Nie, 2022. "Leaching Characteristics of Potentially Toxic Metals from Tailings at Lujiang Alum Mine, China," IJERPH, MDPI, vol. 19(24), pages 1-17, December.

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