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Soil contamination with toxic metal(loid)s represents a severe risk to food security and ecosystem stability in India, where effective strategies for heavy metal soil remediation are critical. Furthermore, hydrochars produced from organic wastes have emerged as promising amendments. However, their capacity for metal immobilization often remains limited by low surface functionality. Consequently, researchers investigated a novel approach by incorporating natural rock phosphate (RP) into various organic feedstocks. This study synthesized RP-modified hydrochars (RP-MHCs) at low temperatures to stabilize multi-metal polluted soil.
Researchers applied these amendments to municipal effluent-polluted soil cultivated with Amaranthus viridis. Notably, the moringa-based treatment immobilized over 84% of Chromium, Copper, and Zinc. In addition, carrot-based hydrochars proved most effective for stabilizing Lead, Cadmium, and Arsenic. These improvements significantly enhanced plant biomass by 70% and reduced bioaccumulation factors below safety thresholds. This research introduces a sustainable strategy for remediating contaminated alkaline soils while ensuring food safety. Existing hydrothermal treatment infrastructure can readily produce these RP-MHCs at a large scale.
Incorporating rock phosphate induces phosphate-induced precipitation and complexation, which significantly enhances the hydrochar's ability to bind and immobilize toxic heavy metals in the soil.
The study demonstrates that these modified hydrochars can effectively immobilize a wide range of toxins, including Chromium, Copper, Zinc, Arsenic, Cadmium, and Lead.
Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or professional healthcare services. Refer to the latest local and national guidelines for clinical practice.
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