Scholarlink

Background and Aims <p>This study addresses the dual challenges of increasing rice safety risks due to cadmium/lead (Cd/Pb) co-contamination in paddy soils and the need for industrial solid waste valorization.</p> Method <p>Pot experiments were conducted to assess the regulatory effects of phosphogypsum (PG), red mud (RM), and their composite amendment (PR) on the soil-rice system.</p> Results <p>We found that PR significantly outperformed PG and RM. Compared to the control (CK), RM and PR increased the soil pH by 1.5 and 1.2 units, respectively, while PG decreased it by 0.3 units. PR significantly reduced the DTPA-Cd/Pb content (Cd: 44.4%, Pb: 46.5%), followed by RM (Cd: 11.8%, Pb: 13.5%). PG reduced the Cd content by 11.8%, but only decreased the Pb content by 1.5%. Furthermore, PR effectively promoted the transformation of heavy metals from acid-extractable (ASF) to more stable residual (RES) fractions. It reduced Cd and Pb concentrations in grains by 86.2% and 70.9%, respectively (&lt; 0.2&#xa0;mg&#xa0;kg <sup>–1</sup>). Remediation efficiencies were measured at 86.4% (Cd) and 29.3% (Pb). Additionally, PR increased yield by 46.4%, crude protein (CP) by 47.1%, and total starch (TS) by 54.3%, respectively. Crucially, PR enriched <i>Proteobacteria</i>, <i>Actinobacteriota</i>, and <i>Desulfobacterota</i>, strengthened nitrogen and sulfur cycling functions, and improved microbial network robustness.</p> Conclusion <p>This study provides theoretical support for utilizing industrial solid wastes in 'waste-to-remediation' strategies aimed at achieving concurrent soil restoration. However, as this study was conducted as a short-term pot experiment, the long-term stability and performance of the remediation under field conditions remain to be tested.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Pot-based assessment of a phosphogypsum-red mud composite for simultaneously mitigating Cd/Pb accumulation and improving grain quality in rice

  • 期刊论文

  • 发表日期：

    2026年4月2日

查看全文
  • Yuanyuan Sun,
  • Ting Chen,
  • Jinjin Wang,
  • Wanyu Huang,
  • Haihe Wang,
  • Zhixi Geng,
  • Fanxin Qin,
  • Jianyong Wu,
  • Shiming Su

摘要

Background and Aims

This study addresses the dual challenges of increasing rice safety risks due to cadmium/lead (Cd/Pb) co-contamination in paddy soils and the need for industrial solid waste valorization.

Method

Pot experiments were conducted to assess the regulatory effects of phosphogypsum (PG), red mud (RM), and their composite amendment (PR) on the soil-rice system.

Results

We found that PR significantly outperformed PG and RM. Compared to the control (CK), RM and PR increased the soil pH by 1.5 and 1.2 units, respectively, while PG decreased it by 0.3 units. PR significantly reduced the DTPA-Cd/Pb content (Cd: 44.4%, Pb: 46.5%), followed by RM (Cd: 11.8%, Pb: 13.5%). PG reduced the Cd content by 11.8%, but only decreased the Pb content by 1.5%. Furthermore, PR effectively promoted the transformation of heavy metals from acid-extractable (ASF) to more stable residual (RES) fractions. It reduced Cd and Pb concentrations in grains by 86.2% and 70.9%, respectively (< 0.2 mg kg –1). Remediation efficiencies were measured at 86.4% (Cd) and 29.3% (Pb). Additionally, PR increased yield by 46.4%, crude protein (CP) by 47.1%, and total starch (TS) by 54.3%, respectively. Crucially, PR enriched Proteobacteria, Actinobacteriota, and Desulfobacterota, strengthened nitrogen and sulfur cycling functions, and improved microbial network robustness.

Conclusion

This study provides theoretical support for utilizing industrial solid wastes in 'waste-to-remediation' strategies aimed at achieving concurrent soil restoration. However, as this study was conducted as a short-term pot experiment, the long-term stability and performance of the remediation under field conditions remain to be tested.