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<p>Cadmium (Cd) contamination in acidified paddy soils poses a major threat to rice safety and necessitates practical remediation strategies compatible with flooded rice cultivation systems. In this study, a Cd-tolerant microalgal strain, <i>Chlorella sorokiniana</i> T003, was isolated and evaluated for its potential to reduce Cd accumulation in rice through a microalgae-based remediation strategy integrated with swine wastewater utilization. Strain T003 maintained growth at Cd concentrations up to 25&#xa0;mg L⁻¹ and removed over 90% of dissolved Cd at 5–25&#xa0;mg L⁻¹, with a removal efficiency of 62% at 50&#xa0;mg L⁻¹. T003 also showed robust growth in untreated swine wastewater, reaching 1.5 × 10¹¹ cells L⁻¹ after 9 d, supporting its suitability for wastewater-based biomass production. In pot experiments, application of T003 cultivated in swine wastewater increased soil pH from 5.61 to 6.60 and reduced rice shoot Cd concentration by up to 75.9% compared with the alkalized control. Field application similarly increased soil pH from 5.60 to 6.11, reduced exchangeable Cd by 49.7%, and decreased grain Cd concentrations by 72.7% and 98.7% in two rice cultivars, respectively. These findings indicate that <i>C. sorokiniana</i> T003 cultivated in swine wastewater can reduce Cd accumulation in rice under field conditions and may provide a biologically based strategy for Cd mitigation in acidified paddy soils while supporting nutrient recycling in crop–livestock systems.</p>

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Swine wastewater-cultivated Chlorella sorokiniana reduces cadmium accumulation in rice grown on contaminated paddy soil

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月2日

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  • Ying Tan,
  • Gongmin Yu,
  • Haixia Xu,
  • Ying Wang,
  • Sili Ying,
  • Tanfei Dai,
  • Mingyang Zhong,
  • Juanjuan Tang,
  • Zhihua Xie,
  • Lianfu Tian,
  • Dongping Li

摘要

Cadmium (Cd) contamination in acidified paddy soils poses a major threat to rice safety and necessitates practical remediation strategies compatible with flooded rice cultivation systems. In this study, a Cd-tolerant microalgal strain, Chlorella sorokiniana T003, was isolated and evaluated for its potential to reduce Cd accumulation in rice through a microalgae-based remediation strategy integrated with swine wastewater utilization. Strain T003 maintained growth at Cd concentrations up to 25 mg L⁻¹ and removed over 90% of dissolved Cd at 5–25 mg L⁻¹, with a removal efficiency of 62% at 50 mg L⁻¹. T003 also showed robust growth in untreated swine wastewater, reaching 1.5 × 10¹¹ cells L⁻¹ after 9 d, supporting its suitability for wastewater-based biomass production. In pot experiments, application of T003 cultivated in swine wastewater increased soil pH from 5.61 to 6.60 and reduced rice shoot Cd concentration by up to 75.9% compared with the alkalized control. Field application similarly increased soil pH from 5.60 to 6.11, reduced exchangeable Cd by 49.7%, and decreased grain Cd concentrations by 72.7% and 98.7% in two rice cultivars, respectively. These findings indicate that C. sorokiniana T003 cultivated in swine wastewater can reduce Cd accumulation in rice under field conditions and may provide a biologically based strategy for Cd mitigation in acidified paddy soils while supporting nutrient recycling in crop–livestock systems.