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Effects of water–organic fertilizer coupling on immobilization remediation technology using sepiolite

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Abstract

Sepiolite shows great potential to reduce pollution risk of cadmium (Cd)-contaminated rice of acidic paddy soils, but its effect was the synergy of water–organic fertilizer coupling in practical application. In this study, we studied the effect of goat manure (GM) in primordial and sepiolite (SP) amended soil under aerobic, intermittent, and flooded irrigation condition. The results showed that the application of goat manure in SP-amended soil increased soil pH by 15.6%–23.6%. The application of goat manure increased the content of DOM by 244.3%, 135.2% in unamended and sepiolite amended soil, respectively. As a consequence, the application of GM increased available Cd extracted by DTPA in SP-amended soil under aerobic and flooded condition, but decreased available Cd under intermittent irrigation condition. The application of sepiolite alone in Cd polluted soil decreased the accumulation of Cd in unpolished rice at the first year, but Cd content witnessed slight increase at the second year. Under intermittent condition, the application of goat manure in SP-amended soil decreased Cd content by 229.2%, 59.3% of unpolished rice in the first and second year, respectively. As a result, the application of goat manure and intermittent irrigation pattern could present a water–organic fertilizer coupling effect in SP-amended soil and further increased the long-term passivation effect of sepiolite.

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Acknowledgements

The current research was supported by the Science and Technology Support Plan Project of Tianjin (20YFZCSN00650).

Funding

This work was supported by the Science and Technology Support Plan Project of Tianjin (20YFZCSN00650).

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Contributions

All authors contributed to the study conception and design. YL and YX contributed to the conception of the study. YL, QH and QX performed the experiment. LZ contributed significantly to data collection. XL, LW, and YS helped perform the analysis with constructive discussions. The first draft of the manuscript was written by YL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yingming Xu.

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The authors have no relevant financial or non-financial interests to disclose.

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Liu, Y., Xu, Y., Huang, Q. et al. Effects of water–organic fertilizer coupling on immobilization remediation technology using sepiolite. Environ Earth Sci 81, 388 (2022). https://doi.org/10.1007/s12665-022-10472-z

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  • DOI: https://doi.org/10.1007/s12665-022-10472-z

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