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Asbestos cement waste treatment through mechanochemical process with KH2PO4 for its utilization in soil pH correction and nutrient delivery

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Abstract

The manufacture of asbestos materials has been banished worldwide due to their toxicity, but discarding the existing wastes remains a challenge. We investigated an alternative mechanochemical method to treat asbestos-cement materials by loading them with potassium and phosphorus from KH2PO4 during the milling process to obtain a product used as liming and soil conditioner. The results showed total asbestos fibrous elimination after 7 to 8 h of milling. The materials showed a slow-release fertilizer profile. The liming property is maintained when the asbestos-cement weight proportion used is equal to or higher than KH2PO4. A comparative soil experiment with limestone also indicates that lower doses of the K- and P-enriched detoxified asbestos cement were required to reach similar liming effects. Maize cultivation (greenhouse) was used to evaluate its performance showing higher biomass production for the sample loaded with potassium and phosphorous.

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Funding

Sao Paulo Research Foundation (FAPESP) Grants #2018/10104-1 and #2016/10636-8. CNPq (Brazilian National Council for Scientific and Technological Development) grant 301743/2018-5.

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Contributions

RB, ASG, GGFG, and HR contributed to the conception, design, material preparation, data collection, and analysis.

RB, ASG, GGFG, CSF, and CR contributed to the first draft of the manuscript.

All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Roger Borges or Caue Ribeiro.

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The authors declare no competing interests.

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Responsible Editor: Kitae Baek

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Borges, R., Giroto, A.S., Guimarães, G.G.F. et al. Asbestos cement waste treatment through mechanochemical process with KH2PO4 for its utilization in soil pH correction and nutrient delivery. Environ Sci Pollut Res 29, 28804–28815 (2022). https://doi.org/10.1007/s11356-021-17679-w

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  • DOI: https://doi.org/10.1007/s11356-021-17679-w

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  1. Roger Borges
  2. Caue Ribeiro