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Quantitative Distribution and Contamination Risk Assessment of Cu and Zn in Municipal Sewage Sludge

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  • Monika Jakubus

    (Department of Soil Science and Microbiology, Poznan University of Life Sciences, 60-656 Poznań, Poland)

Abstract

One of the methods of managing sewage sludge (SS) is its soil application. This possibility is promoted by the chemical composition rich in organic matter and nutrients. However, heavy metal contents in SS must meet respective permissible limits. Among the heavy metals in SS, Cu and Zn are found in the largest amount; thus, this study focuses on these elements. The main aim of the study is to investigate the quantitative distribution of metals in sequentially separated fractions of sewage sludge. Additionally, the potential risk of environmental contamination with heavy metals was assessed in the case of SS application for agricultural purposes. The relevant analyses were conducted on four different examples of municipal SS. Based on the total amounts as well as those determined in the SS fractions, the following indices were calculated: I geo (geoaccumulation index), ICF, (individual contamination factor), and RAC (risk assessment code). The use of data from the sequential analysis as well as the calculated indices made it possible to assess the usefulness of SS in practice in terms of potential introduction of Cu and Zn into the environment with the sludge dose. It was found that total Cu (Cu tot ) and Zn (Zn tot ) did not exceed the permissible limits binding within respective Polish and international regulations. Regardless of the years of study and the analyzed SS, Cu tot ranged from 260.9 to 393.5 mg·kg −1 , and Zn tot from 475.5 to 1153.1 mg·kg −1 . The amounts of Cu and Zn were predominantly reducible (bound to iron and manganese hydroxides, Fr. II) and oxidizable complexes (bound to organic matter and sulfides, Fr. III). The average amounts of Cu in Fr. II ranged from 149.4 to 172.4 mg·kg −1 , while those of Zn in Fr. II ranged from 370.9 to 754.6 mg·kg −1 . Cu amounts in Fr. III were from 160.9 to 183 mg·kg −1 and Zn amounts in Fr. III were from 104.9 to 171.9 mg·kg −1 . Total content of metals as well as TOC values strongly determined the quantitative level of both elements in the SS fractions. Generally, with the increase in the total amount of metals, their levels in the sludge fractions increased. In turn, the increase in TOC resulted in a decrease in the amounts of Cu and Zn in the sludge fractions. Calculated I geo and ICF ratios showed high and very high SS contamination with Cu and Zn. I geo values for Cu, regardless of the year of study and sludge sample, that ranged from 4.62 to 5.43 and for Zn from 3.41 to 4.86. At the same time, the ICF values for Cu ranged from 8.59–23.04, and for Zn 15.42–44.47. The RAC values indicated a low (Cu) and medium (Zn) risk of using SS in terms of the potential metal availability in the environment. The RAC values ranged from 1.46 to 4.40% for Cu and from 9.63 to 23.13% for Zn.

Suggested Citation

  • Monika Jakubus, 2023. "Quantitative Distribution and Contamination Risk Assessment of Cu and Zn in Municipal Sewage Sludge," Sustainability, MDPI, vol. 15(15), pages 1-18, August.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:15:p:12087-:d:1212210
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    References listed on IDEAS

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    1. Sina Shaddel & Hamidreza Bakhtiary-Davijany & Christian Kabbe & Farbod Dadgar & Stein W. Østerhus, 2019. "Sustainable Sewage Sludge Management: From Current Practices to Emerging Nutrient Recovery Technologies," Sustainability, MDPI, vol. 11(12), pages 1-12, June.
    2. Maria Cristina Collivignarelli & Alessandro Abbà & Andrea Frattarola & Marco Carnevale Miino & Sergio Padovani & Ioannis Katsoyiannis & Vincenzo Torretta, 2019. "Legislation for the Reuse of Biosolids on Agricultural Land in Europe: Overview," Sustainability, MDPI, vol. 11(21), pages 1-22, October.
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