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Related Experiment Video

Updated: Aug 15, 2025

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Recycled biochar adsorption combined with CaCl2 washing to increase rice yields and decrease Cd levels in grains and

Yao Shi1, Fengjiao Zhang1, Chengqiong Du2

  • 1School of Environmental Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China.

The Science of the Total Environment
|January 1, 2023
PubMed
Summary

Recycled hydroxyapatite modified biochar (HBC) combined with CaCl2 effectively removes cadmium (Cd) from paddy soil. This novel remediation strategy also boosts rice yield and soil health.

Keywords:
CadmiumChemical washingField trialPaddy soilRecycled hydroxyapatite modified biocharRice grain

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Area of Science:

  • Environmental Science
  • Soil Science
  • Agricultural Chemistry

Background:

  • Cadmium (Cd) contamination in paddy soils poses risks to food safety and human health.
  • Traditional remediation methods often have limitations in efficiency and sustainability.
  • South China faces challenges with poor soil fertility, desilication, and Cd contamination.

Purpose of the Study:

  • To evaluate the synergistic effect of recycled hydroxyapatite modified biochar (HBC) and low-level CaCl2 washing for cadmium removal from paddy soil.
  • To assess the impact of this remediation strategy on Cd translocation, accumulation in rice, soil properties, and crop yield.
  • To investigate the reusability of HBC and the potential for wastewater reuse in irrigation.

Main Methods:

  • Field-scale trials using recycled HBC and CaCl2 washing to remediate Cd-contaminated paddy soil.
  • Analysis of total and available Cd concentrations in soil.
  • Measurement of Cd translocation and accumulation in rice plants and grains.
  • Assessment of soil organic matter (SOM), cation exchange capacity (CEC), and nutrient levels.
  • Monitoring of grain yields and evaluation of HBC regeneration and wastewater treatment.

Main Results:

  • Combined HBC and CaCl2 achieved synergistic reduction efficiencies of 45.6% for total Cd and 36.8% for available Cd.
  • Cd content in rice grains decreased by approximately 85%, meeting national food standards.
  • Significant increases in SOM, CEC, and soil nutrients were observed.
  • Grain yields increased by 34.1% for early rice and 9.91% for late rice.
  • Recycled HBC demonstrated high regeneration efficiency (>85%), and treated wastewater was suitable for irrigation.

Conclusions:

  • The combined application of recycled HBC and CaCl2 offers a novel and effective remediation strategy for Cd-contaminated paddy soils.
  • This approach significantly reduces Cd contamination in soil and rice grains while improving soil fertility and crop productivity.
  • The reusability of HBC and the potential for wastewater reuse highlight the sustainability of this remediation technique.